Use new UrlContext for project URLs

Wow that was a lot to change

src/hmnurl/hmnurl.go

@@ -6,8 +6,9 @@ import (
 	"regexp"
 	"time"
 
-	"git.handmade.network/hmn/hmn/src/config"
 	"git.handmade.network/hmn/hmn/src/models"
+
+	"git.handmade.network/hmn/hmn/src/config"
 	"git.handmade.network/hmn/hmn/src/oops"
 )
 
@@ -62,34 +63,25 @@ func GetBaseHost() string {
 	return baseUrlParsed.Host
 }
 
+type UrlContext struct {
+	PersonalProject bool
+	ProjectID       int
+	ProjectSlug     string
+	ProjectName     string
+}
+
+var HMNProjectContext = UrlContext{
+	PersonalProject: false,
+	ProjectID:       models.HMNProjectID,
+	ProjectSlug:     models.HMNProjectSlug,
+}
+
 func Url(path string, query []Q) string {
-	return ProjectUrl(path, query, "")
+	return UrlWithFragment(path, query, "")
 }
 
-func ProjectUrl(path string, query []Q, slug string) string {
+func UrlWithFragment(path string, query []Q, fragment string) string {
-	return ProjectUrlWithFragment(path, query, slug, "")
+	return HMNProjectContext.UrlWithFragment(path, query, fragment)
-}
-
-func ProjectUrlWithFragment(path string, query []Q, slug string, fragment string) string {
-	subdomain := slug
-	if slug == models.HMNProjectSlug {
-		subdomain = ""
-	}
-
-	host := baseUrlParsed.Host
-	if len(subdomain) > 0 {
-		host = slug + "." + host
-	}
-
-	url := url.URL{
-		Scheme:   baseUrlParsed.Scheme,
-		Host:     host,
-		Path:     trim(path),
-		RawQuery: encodeQuery(query),
-		Fragment: fragment,
-	}
-
-	return url.String()
 }
 
 func trim(path string) string {

src/hmnurl/urls.go

@@ -21,12 +21,11 @@ var RegexOldHome = regexp.MustCompile("^/home$")
 var RegexHomepage = regexp.MustCompile("^/$")
 
 func BuildHomepage() string {
-	return Url("/", nil)
+	return HMNProjectContext.BuildHomepage()
 }
 
-func BuildOfficialProjectHomepage(projectSlug string) string {
+func (c *UrlContext) BuildHomepage() string {
-	defer CatchPanic()
+	return c.Url("/", nil)
-	return ProjectUrl("/", nil, projectSlug)
 }
 
 var RegexShowcase = regexp.MustCompile("^/showcase$")
@@ -196,7 +195,7 @@ func BuildUserProfile(username string) string {
 var RegexUserSettings = regexp.MustCompile(`^/settings$`)
 
 func BuildUserSettings(section string) string {
-	return ProjectUrlWithFragment("/settings", nil, "", section)
+	return UrlWithFragment("/settings", nil, section)
 }
 
 /*
@@ -302,10 +301,10 @@ func BuildPersonalProject(id int, slug string) string {
 
 var RegexProjectEdit = regexp.MustCompile("^/edit$")
 
-func BuildProjectEdit(slug string, section string) string {
+func (c *UrlContext) BuildProjectEdit(section string) string {
 	defer CatchPanic()
 
-	return ProjectUrlWithFragment(fmt.Sprintf("/p/%s/edit", slug), nil, "", section)
+	return c.UrlWithFragment("/edit", nil, section)
 }
 
 /*
@@ -367,7 +366,50 @@ func BuildPodcastEpisodeFile(filename string) string {
 // Make sure to match Thread before Subforum in the router.
 var RegexForum = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?(/(?P<page>\d+))?$`)
 
-func BuildForum(projectSlug string, subforums []string, page int) string {
+func (c *UrlContext) Url(path string, query []Q) string {
+	return c.UrlWithFragment(path, query, "")
+}
+
+func (c *UrlContext) UrlWithFragment(path string, query []Q, fragment string) string {
+	if c == nil {
+		logging.Warn().Stack().Msg("URL context was nil; defaulting to the HMN URL context")
+		c = &HMNProjectContext
+	}
+
+	if c.PersonalProject {
+		url := url.URL{
+			Scheme:   baseUrlParsed.Scheme,
+			Host:     baseUrlParsed.Host,
+			Path:     fmt.Sprintf("p/%d/%s/%s", c.ProjectID, models.GeneratePersonalProjectSlug(c.ProjectName), trim(path)),
+			RawQuery: encodeQuery(query),
+			Fragment: fragment,
+		}
+
+		return url.String()
+	} else {
+		subdomain := c.ProjectSlug
+		if c.ProjectSlug == models.HMNProjectSlug {
+			subdomain = ""
+		}
+
+		host := baseUrlParsed.Host
+		if len(subdomain) > 0 {
+			host = c.ProjectSlug + "." + host
+		}
+
+		url := url.URL{
+			Scheme:   baseUrlParsed.Scheme,
+			Host:     host,
+			Path:     trim(path),
+			RawQuery: encodeQuery(query),
+			Fragment: fragment,
+		}
+
+		return url.String()
+	}
+}
+
+func (c *UrlContext) BuildForum(subforums []string, page int) string {
 	defer CatchPanic()
 	if page < 1 {
 		panic(oops.New(nil, "Invalid forum thread page (%d), must be >= 1", page))
@@ -380,13 +422,13 @@ func BuildForum(projectSlug string, subforums []string, page int) string {
 		builder.WriteString(strconv.Itoa(page))
 	}
 
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexForumNewThread = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/new$`)
 var RegexForumNewThreadSubmit = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/new/submit$`)
 
-func BuildForumNewThread(projectSlug string, subforums []string, submit bool) string {
+func (c *UrlContext) BuildForumNewThread(subforums []string, submit bool) string {
 	defer CatchPanic()
 	builder := buildSubforumPath(subforums)
 	builder.WriteString("/t/new")
@@ -394,59 +436,59 @@ func BuildForumNewThread(projectSlug string, subforums []string, submit bool) st
 		builder.WriteString("/submit")
 	}
 
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexForumThread = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/(?P<threadid>\d+)(-([^/]+))?(/(?P<page>\d+))?$`)
 
-func BuildForumThread(projectSlug string, subforums []string, threadId int, title string, page int) string {
+func (c *UrlContext) BuildForumThread(subforums []string, threadId int, title string, page int) string {
 	defer CatchPanic()
 	builder := buildForumThreadPath(subforums, threadId, title, page)
 
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
-func BuildForumThreadWithPostHash(projectSlug string, subforums []string, threadId int, title string, page int, postId int) string {
+func (c *UrlContext) BuildForumThreadWithPostHash(subforums []string, threadId int, title string, page int, postId int) string {
 	defer CatchPanic()
 	builder := buildForumThreadPath(subforums, threadId, title, page)
 
-	return ProjectUrlWithFragment(builder.String(), nil, projectSlug, strconv.Itoa(postId))
+	return UrlWithFragment(builder.String(), nil, strconv.Itoa(postId))
 }
 
 var RegexForumPost = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/(?P<threadid>\d+)/p/(?P<postid>\d+)$`)
 
-func BuildForumPost(projectSlug string, subforums []string, threadId int, postId int) string {
+func (c *UrlContext) BuildForumPost(subforums []string, threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildForumPostPath(subforums, threadId, postId)
 
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexForumPostDelete = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/(?P<threadid>\d+)/p/(?P<postid>\d+)/delete$`)
 
-func BuildForumPostDelete(projectSlug string, subforums []string, threadId int, postId int) string {
+func (c *UrlContext) BuildForumPostDelete(subforums []string, threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildForumPostPath(subforums, threadId, postId)
 	builder.WriteString("/delete")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexForumPostEdit = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/(?P<threadid>\d+)/p/(?P<postid>\d+)/edit$`)
 
-func BuildForumPostEdit(projectSlug string, subforums []string, threadId int, postId int) string {
+func (c *UrlContext) BuildForumPostEdit(subforums []string, threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildForumPostPath(subforums, threadId, postId)
 	builder.WriteString("/edit")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexForumPostReply = regexp.MustCompile(`^/forums(/(?P<subforums>[^\d/]+(/[^\d]+)*))?/t/(?P<threadid>\d+)/p/(?P<postid>\d+)/reply$`)
 
-func BuildForumPostReply(projectSlug string, subforums []string, threadId int, postId int) string {
+func (c *UrlContext) BuildForumPostReply(subforums []string, threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildForumPostPath(subforums, threadId, postId)
 	builder.WriteString("/reply")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexWikiArticle = regexp.MustCompile(`^/wiki/(?P<threadid>\d+)(-([^/]+))?$`)
@@ -459,7 +501,7 @@ var RegexBlogsRedirect = regexp.MustCompile(`^/blogs(?P<remainder>.*)`)
 
 var RegexBlog = regexp.MustCompile(`^/blog(/(?P<page>\d+))?$`)
 
-func BuildBlog(projectSlug string, page int) string {
+func (c *UrlContext) BuildBlog(page int) string {
 	defer CatchPanic()
 	if page < 1 {
 		panic(oops.New(nil, "Invalid blog page (%d), must be >= 1", page))
@@ -470,63 +512,63 @@ func BuildBlog(projectSlug string, page int) string {
 		path += "/" + strconv.Itoa(page)
 	}
 
-	return ProjectUrl(path, nil, projectSlug)
+	return c.Url(path, nil)
 }
 
 var RegexBlogThread = regexp.MustCompile(`^/blog/p/(?P<threadid>\d+)(-([^/]+))?$`)
 
-func BuildBlogThread(projectSlug string, threadId int, title string) string {
+func (c *UrlContext) BuildBlogThread(threadId int, title string) string {
 	defer CatchPanic()
 	builder := buildBlogThreadPath(threadId, title)
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
-func BuildBlogThreadWithPostHash(projectSlug string, threadId int, title string, postId int) string {
+func (c *UrlContext) BuildBlogThreadWithPostHash(threadId int, title string, postId int) string {
 	defer CatchPanic()
 	builder := buildBlogThreadPath(threadId, title)
-	return ProjectUrlWithFragment(builder.String(), nil, projectSlug, strconv.Itoa(postId))
+	return c.UrlWithFragment(builder.String(), nil, strconv.Itoa(postId))
 }
 
 var RegexBlogNewThread = regexp.MustCompile(`^/blog/new$`)
 
-func BuildBlogNewThread(projectSlug string) string {
+func (c *UrlContext) BuildBlogNewThread() string {
 	defer CatchPanic()
-	return ProjectUrl("/blog/new", nil, projectSlug)
+	return c.Url("/blog/new", nil)
 }
 
 var RegexBlogPost = regexp.MustCompile(`^/blog/p/(?P<threadid>\d+)/e/(?P<postid>\d+)$`)
 
-func BuildBlogPost(projectSlug string, threadId int, postId int) string {
+func (c *UrlContext) BuildBlogPost(threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildBlogPostPath(threadId, postId)
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexBlogPostDelete = regexp.MustCompile(`^/blog/p/(?P<threadid>\d+)/e/(?P<postid>\d+)/delete$`)
 
-func BuildBlogPostDelete(projectSlug string, threadId int, postId int) string {
+func (c *UrlContext) BuildBlogPostDelete(threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildBlogPostPath(threadId, postId)
 	builder.WriteString("/delete")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexBlogPostEdit = regexp.MustCompile(`^/blog/p/(?P<threadid>\d+)/e/(?P<postid>\d+)/edit$`)
 
-func BuildBlogPostEdit(projectSlug string, threadId int, postId int) string {
+func (c *UrlContext) BuildBlogPostEdit(threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildBlogPostPath(threadId, postId)
 	builder.WriteString("/edit")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexBlogPostReply = regexp.MustCompile(`^/blog/p/(?P<threadid>\d+)/e/(?P<postid>\d+)/reply$`)
 
-func BuildBlogPostReply(projectSlug string, threadId int, postId int) string {
+func (c *UrlContext) BuildBlogPostReply(threadId int, postId int) string {
 	defer CatchPanic()
 	builder := buildBlogPostPath(threadId, postId)
 	builder.WriteString("/reply")
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 /*
@@ -580,7 +622,7 @@ func BuildLibraryResource(resourceId int) string {
 
 var RegexEpisodeList = regexp.MustCompile(`^/episode(/(?P<topic>[^/]+))?$`)
 
-func BuildEpisodeList(projectSlug string, topic string) string {
+func (c *UrlContext) BuildEpisodeList(topic string) string {
 	defer CatchPanic()
 
 	var builder strings.Builder
@@ -589,21 +631,21 @@ func BuildEpisodeList(projectSlug string, topic string) string {
 		builder.WriteString("/")
 		builder.WriteString(topic)
 	}
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexEpisode = regexp.MustCompile(`^/episode/(?P<topic>[^/]+)/(?P<episode>[^/]+)$`)
 
-func BuildEpisode(projectSlug string, topic string, episode string) string {
+func (c *UrlContext) BuildEpisode(topic string, episode string) string {
 	defer CatchPanic()
-	return ProjectUrl(fmt.Sprintf("/episode/%s/%s", topic, episode), nil, projectSlug)
+	return c.Url(fmt.Sprintf("/episode/%s/%s", topic, episode), nil)
 }
 
 var RegexCineraIndex = regexp.MustCompile(`^/(?P<topic>[^/]+).index$`)
 
-func BuildCineraIndex(projectSlug string, topic string) string {
+func (c *UrlContext) BuildCineraIndex(topic string) string {
 	defer CatchPanic()
-	return ProjectUrl(fmt.Sprintf("/%s.index", topic), nil, projectSlug)
+	return c.Url(fmt.Sprintf("/%s.index", topic), nil)
 }
 
 /*
@@ -635,8 +677,8 @@ func BuildDiscordShowcaseBacklog() string {
 var RegexAssetUpload = regexp.MustCompile("^/upload_asset$")
 
 // NOTE(asaf): Providing the projectSlug avoids any CORS problems.
-func BuildAssetUpload(projectSlug string) string {
+func (c *UrlContext) BuildAssetUpload() string {
-	return ProjectUrl("/upload_asset", nil, projectSlug)
+	return c.Url("/upload_asset", nil)
 }
 
 /*
@@ -715,7 +757,7 @@ func BuildUserFile(filepath string) string {
 var RegexForumMarkRead = regexp.MustCompile(`^/markread/(?P<sfid>\d+)$`)
 
 // NOTE(asaf): subforumId == 0 means ALL SUBFORUMS
-func BuildForumMarkRead(projectSlug string, subforumId int) string {
+func (c *UrlContext) BuildForumMarkRead(subforumId int) string {
 	defer CatchPanic()
 	if subforumId < 0 {
 		panic(oops.New(nil, "Invalid subforum ID (%d), must be >= 0", subforumId))
@@ -725,7 +767,7 @@ func BuildForumMarkRead(projectSlug string, subforumId int) string {
 	builder.WriteString("/markread/")
 	builder.WriteString(strconv.Itoa(subforumId))
 
-	return ProjectUrl(builder.String(), nil, projectSlug)
+	return c.Url(builder.String(), nil)
 }
 
 var RegexCatchAll = regexp.MustCompile("^")

src/templates/mapping.go

@@ -59,22 +59,11 @@ var LifecycleBadgeStrings = map[models.ProjectLifecycle]string{
 	models.ProjectLifecycleLTS:              "Complete",
 }
 
-func ProjectUrl(p *models.Project) string {
+func ProjectToTemplate(p *models.Project, url string, theme string) Project {
-	var url string
-	if p.Personal {
-		url = hmnurl.BuildPersonalProject(p.ID, models.GeneratePersonalProjectSlug(p.Name))
-	} else {
-		url = hmnurl.BuildOfficialProjectHomepage(p.Slug)
-	}
-	return url
-}
-
-func ProjectToTemplate(p *models.Project, theme string) Project {
 	logo := p.LogoLight
 	if theme == "dark" {
 		logo = p.LogoDark
 	}
-	url := ProjectUrl(p)
 	return Project{
 		Name:              p.Name,
 		Subdomain:         p.Subdomain(),
@@ -91,9 +80,8 @@ func ProjectToTemplate(p *models.Project, theme string) Project {
 
 		IsHMN: p.IsHMN(),
 
-		HasBlog:    p.BlogEnabled,
+		HasBlog:  p.BlogEnabled,
-		HasForum:   p.ForumEnabled,
+		HasForum: p.ForumEnabled,
-		HasLibrary: false, // TODO: port the library lol
 
 		DateApproved: p.DateApproved,
 	}

src/templates/types.go

@@ -126,9 +126,8 @@ type Project struct {
 
 	IsHMN bool
 
-	HasBlog    bool
+	HasBlog  bool
-	HasForum   bool
+	HasForum bool
-	HasLibrary bool
 
 	UUID         string
 	DateApproved time.Time

src/website/admin.go

@@ -137,7 +137,7 @@ func AdminApprovalQueue(c *RequestContext) ResponseData {
 	for _, p := range posts {
 		post := templates.PostToTemplate(&p.Post, &p.Author, c.Theme)
 		post.AddContentVersion(p.CurrentVersion, &p.Author) // NOTE(asaf): Don't care about editors here
-		post.Url = UrlForGenericPost(&p.Thread, &p.Post, lineageBuilder, p.Project.Slug)
+		post.Url = UrlForGenericPost(UrlContextForProject(&p.Project), &p.Thread, &p.Post, lineageBuilder)
 		data.Posts = append(data.Posts, postWithTitle{
 			Post:  post,
 			Title: p.Thread.Title,

src/website/base_data.go

@@ -26,7 +26,7 @@ func getBaseData(c *RequestContext, title string, breadcrumbs []templates.Breadc
 	notices := getNoticesFromCookie(c)
 
 	if len(breadcrumbs) > 0 {
-		projectUrl := UrlForProject(c.CurrentProject)
+		projectUrl := c.UrlContext.BuildHomepage()
 		if breadcrumbs[0].Url != projectUrl {
 			rootBreadcrumb := templates.Breadcrumb{
 				Name: c.CurrentProject.Name,
@@ -42,11 +42,11 @@ func getBaseData(c *RequestContext, title string, breadcrumbs []templates.Breadc
 		Breadcrumbs: breadcrumbs,
 
 		CurrentUrl:        c.FullUrl(),
-		CurrentProjectUrl: UrlForProject(c.CurrentProject),
+		CurrentProjectUrl: c.UrlContext.BuildHomepage(),
 		LoginPageUrl:      hmnurl.BuildLoginPage(c.FullUrl()),
 		ProjectCSSUrl:     hmnurl.BuildProjectCSS(c.CurrentProject.Color1),
 
-		Project: templates.ProjectToTemplate(c.CurrentProject, c.Theme),
+		Project: templates.ProjectToTemplate(c.CurrentProject, c.UrlContext.BuildHomepage(), c.Theme),
 		User:    templateUser,
 		Session: templateSession,
 		Notices: notices,
@@ -67,7 +67,7 @@ func getBaseData(c *RequestContext, title string, breadcrumbs []templates.Breadc
 			HMNHomepageUrl:  hmnurl.BuildHomepage(),
 			ProjectIndexUrl: hmnurl.BuildProjectIndex(1),
 			PodcastUrl:      hmnurl.BuildPodcast(),
-			ForumsUrl:       hmnurl.BuildForum(models.HMNProjectSlug, nil, 1),
+			ForumsUrl:       hmnurl.HMNProjectContext.BuildForum(nil, 1),
 			LibraryUrl:      hmnurl.BuildLibrary(),
 		},
 		Footer: templates.Footer{
@@ -77,7 +77,7 @@ func getBaseData(c *RequestContext, title string, breadcrumbs []templates.Breadc
 			CodeOfConductUrl:           hmnurl.BuildCodeOfConduct(),
 			CommunicationGuidelinesUrl: hmnurl.BuildCommunicationGuidelines(),
 			ProjectIndexUrl:            hmnurl.BuildProjectIndex(1),
-			ForumsUrl:                  hmnurl.BuildForum(models.HMNProjectSlug, nil, 1),
+			ForumsUrl:                  hmnurl.HMNProjectContext.BuildForum(nil, 1),
 			ContactUrl:                 hmnurl.BuildContactPage(),
 		},
 	}
@@ -90,15 +90,15 @@ func getBaseData(c *RequestContext, title string, breadcrumbs []templates.Breadc
 		episodeGuideUrl := ""
 		defaultTopic, hasAnnotations := config.Config.EpisodeGuide.Projects[c.CurrentProject.Slug]
 		if hasAnnotations {
-			episodeGuideUrl = hmnurl.BuildEpisodeList(c.CurrentProject.Slug, defaultTopic)
+			episodeGuideUrl = c.UrlContext.BuildEpisodeList(defaultTopic)
 		}
 
 		baseData.Header.Project = &templates.ProjectHeader{
 			HasForums:       c.CurrentProject.ForumEnabled,
 			HasBlog:         c.CurrentProject.BlogEnabled,
 			HasEpisodeGuide: hasAnnotations,
-			ForumsUrl:       hmnurl.BuildForum(c.CurrentProject.Slug, nil, 1),
+			ForumsUrl:       c.UrlContext.BuildForum(nil, 1),
-			BlogUrl:         hmnurl.BuildBlog(c.CurrentProject.Slug, 1),
+			BlogUrl:         c.UrlContext.BuildBlog(1),
 			EpisodeGuideUrl: episodeGuideUrl,
 		}
 	}

src/website/blogs.go

@@ -46,7 +46,7 @@ func BlogIndex(c *RequestContext) ResponseData {
 	numPages := utils.NumPages(numPosts, postsPerPage)
 	page, ok := ParsePageNumber(c, "page", numPages)
 	if !ok {
-		c.Redirect(hmnurl.BuildBlog(c.CurrentProject.Slug, page), http.StatusSeeOther)
+		c.Redirect(c.UrlContext.BuildBlog(page), http.StatusSeeOther)
 	}
 
 	threads, err := FetchThreads(c.Context(), c.Conn, c.CurrentUser, ThreadsQuery{
@@ -63,14 +63,14 @@ func BlogIndex(c *RequestContext) ResponseData {
 	for _, thread := range threads {
 		entries = append(entries, blogIndexEntry{
 			Title:   thread.Thread.Title,
-			Url:     hmnurl.BuildBlogThread(c.CurrentProject.Slug, thread.Thread.ID, thread.Thread.Title),
+			Url:     c.UrlContext.BuildBlogThread(thread.Thread.ID, thread.Thread.Title),
 			Author:  templates.UserToTemplate(thread.FirstPostAuthor, c.Theme),
 			Date:    thread.FirstPost.PostDate,
 			Content: template.HTML(thread.FirstPostCurrentVersion.TextParsed),
 		})
 	}
 
-	baseData := getBaseData(c, fmt.Sprintf("%s Blog", c.CurrentProject.Name), []templates.Breadcrumb{BlogBreadcrumb(c.CurrentProject.Slug)})
+	baseData := getBaseData(c, fmt.Sprintf("%s Blog", c.CurrentProject.Name), []templates.Breadcrumb{BlogBreadcrumb(c.UrlContext)})
 
 	canCreate := false
 	if c.CurrentUser != nil {
@@ -97,14 +97,14 @@ func BlogIndex(c *RequestContext) ResponseData {
 			Current: page,
 			Total:   numPages,
 
-			FirstUrl:    hmnurl.BuildBlog(c.CurrentProject.Slug, 1),
+			FirstUrl:    c.UrlContext.BuildBlog(1),
-			LastUrl:     hmnurl.BuildBlog(c.CurrentProject.Slug, numPages),
+			LastUrl:     c.UrlContext.BuildBlog(numPages),
-			PreviousUrl: hmnurl.BuildBlog(c.CurrentProject.Slug, utils.IntClamp(1, page-1, numPages)),
+			PreviousUrl: c.UrlContext.BuildBlog(utils.IntClamp(1, page-1, numPages)),
-			NextUrl:     hmnurl.BuildBlog(c.CurrentProject.Slug, utils.IntClamp(1, page+1, numPages)),
+			NextUrl:     c.UrlContext.BuildBlog(utils.IntClamp(1, page+1, numPages)),
 		},
 
 		CanCreatePost: canCreate,
-		NewPostUrl:    hmnurl.BuildBlogNewThread(c.CurrentProject.Slug),
+		NewPostUrl:    c.UrlContext.BuildBlogNewThread(),
 	}, c.Perf)
 	return res
 }
@@ -138,11 +138,11 @@ func BlogThread(c *RequestContext) ResponseData {
 	for _, p := range posts {
 		post := templates.PostToTemplate(&p.Post, p.Author, c.Theme)
 		post.AddContentVersion(p.CurrentVersion, p.Editor)
-		addBlogUrlsToPost(&post, c.CurrentProject.Slug, &p.Thread, p.Post.ID)
+		addBlogUrlsToPost(c.UrlContext, &post, &p.Thread, p.Post.ID)
 
 		if p.ReplyPost != nil {
 			reply := templates.PostToTemplate(p.ReplyPost, p.ReplyAuthor, c.Theme)
-			addBlogUrlsToPost(&reply, c.CurrentProject.Slug, &p.Thread, p.Post.ID)
+			addBlogUrlsToPost(c.UrlContext, &reply, &p.Thread, p.Post.ID)
 			post.ReplyPost = &reply
 		}
 
@@ -168,7 +168,7 @@ func BlogThread(c *RequestContext) ResponseData {
 		}
 	}
 
-	baseData := getBaseData(c, thread.Title, []templates.Breadcrumb{BlogBreadcrumb(c.CurrentProject.Slug)})
+	baseData := getBaseData(c, thread.Title, []templates.Breadcrumb{BlogBreadcrumb(c.UrlContext)})
 	baseData.OpenGraphItems = append(baseData.OpenGraphItems, templates.OpenGraphItem{
 		Property: "og:description",
 		Value:    posts[0].Post.Preview,
@@ -180,7 +180,7 @@ func BlogThread(c *RequestContext) ResponseData {
 		Thread:    templates.ThreadToTemplate(&thread),
 		MainPost:  templatePosts[0],
 		Comments:  templatePosts[1:],
-		ReplyLink: hmnurl.BuildBlogPostReply(c.CurrentProject.Slug, cd.ThreadID, posts[0].Post.ID),
+		ReplyLink: c.UrlContext.BuildBlogPostReply(cd.ThreadID, posts[0].Post.ID),
 		LoginLink: hmnurl.BuildLoginPage(c.FullUrl()),
 	}, c.Perf)
 	return res
@@ -202,7 +202,7 @@ func BlogPostRedirectToThread(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch thread for blog redirect"))
 	}
 
-	threadUrl := hmnurl.BuildBlogThreadWithPostHash(c.CurrentProject.Slug, cd.ThreadID, thread.Thread.Title, cd.PostID)
+	threadUrl := c.UrlContext.BuildBlogThreadWithPostHash(cd.ThreadID, thread.Thread.Title, cd.PostID)
 	return c.Redirect(threadUrl, http.StatusFound)
 }
 
@@ -210,11 +210,11 @@ func BlogNewThread(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		fmt.Sprintf("Create New Post | %s", c.CurrentProject.Name),
-		[]templates.Breadcrumb{BlogBreadcrumb(c.CurrentProject.Slug)},
+		[]templates.Breadcrumb{BlogBreadcrumb(c.UrlContext)},
 	)
 
-	editData := getEditorDataForNew(c.CurrentUser, baseData, nil)
+	editData := getEditorDataForNew(c.UrlContext, c.CurrentUser, baseData, nil)
-	editData.SubmitUrl = hmnurl.BuildBlogNewThread(c.CurrentProject.Slug)
+	editData.SubmitUrl = c.UrlContext.BuildBlogNewThread()
 	editData.SubmitLabel = "Create Post"
 
 	var res ResponseData
@@ -268,7 +268,7 @@ func BlogNewThreadSubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to create new blog post"))
 	}
 
-	newThreadUrl := hmnurl.BuildBlogThread(c.CurrentProject.Slug, threadId, title)
+	newThreadUrl := c.UrlContext.BuildBlogThread(threadId, title)
 	return c.Redirect(newThreadUrl, http.StatusSeeOther)
 }
 
@@ -301,11 +301,11 @@ func BlogPostEdit(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		title,
-		BlogThreadBreadcrumbs(c.CurrentProject.Slug, &post.Thread),
+		BlogThreadBreadcrumbs(c.UrlContext, &post.Thread),
 	)
 
-	editData := getEditorDataForEdit(c.CurrentUser, baseData, post)
+	editData := getEditorDataForEdit(c.UrlContext, c.CurrentUser, baseData, post)
-	editData.SubmitUrl = hmnurl.BuildBlogPostEdit(c.CurrentProject.Slug, cd.ThreadID, cd.PostID)
+	editData.SubmitUrl = c.UrlContext.BuildBlogPostEdit(cd.ThreadID, cd.PostID)
 	editData.SubmitLabel = "Submit Edited Post"
 	if post.Thread.FirstID != post.Post.ID {
 		editData.SubmitLabel = "Submit Edited Comment"
@@ -373,7 +373,7 @@ func BlogPostEditSubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to edit blog post"))
 	}
 
-	postUrl := hmnurl.BuildBlogThreadWithPostHash(c.CurrentProject.Slug, cd.ThreadID, post.Thread.Title, cd.PostID)
+	postUrl := c.UrlContext.BuildBlogThreadWithPostHash(cd.ThreadID, post.Thread.Title, cd.PostID)
 	return c.Redirect(postUrl, http.StatusSeeOther)
 }
 
@@ -396,14 +396,14 @@ func BlogPostReply(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		fmt.Sprintf("Replying to comment in \"%s\" | %s", post.Thread.Title, c.CurrentProject.Name),
-		BlogThreadBreadcrumbs(c.CurrentProject.Slug, &post.Thread),
+		BlogThreadBreadcrumbs(c.UrlContext, &post.Thread),
 	)
 
 	replyPost := templates.PostToTemplate(&post.Post, post.Author, c.Theme)
 	replyPost.AddContentVersion(post.CurrentVersion, post.Editor)
 
-	editData := getEditorDataForNew(c.CurrentUser, baseData, &replyPost)
+	editData := getEditorDataForNew(c.UrlContext, c.CurrentUser, baseData, &replyPost)
-	editData.SubmitUrl = hmnurl.BuildBlogPostReply(c.CurrentProject.Slug, cd.ThreadID, cd.PostID)
+	editData.SubmitUrl = c.UrlContext.BuildBlogPostReply(cd.ThreadID, cd.PostID)
 	editData.SubmitLabel = "Submit Reply"
 
 	var res ResponseData
@@ -439,7 +439,7 @@ func BlogPostReplySubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to reply to blog post"))
 	}
 
-	newPostUrl := hmnurl.BuildBlogPost(c.CurrentProject.Slug, cd.ThreadID, newPostId)
+	newPostUrl := c.UrlContext.BuildBlogPost(cd.ThreadID, newPostId)
 	return c.Redirect(newPostUrl, http.StatusSeeOther)
 }
 
@@ -472,7 +472,7 @@ func BlogPostDelete(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		title,
-		BlogThreadBreadcrumbs(c.CurrentProject.Slug, &post.Thread),
+		BlogThreadBreadcrumbs(c.UrlContext, &post.Thread),
 	)
 
 	templatePost := templates.PostToTemplate(&post.Post, post.Author, c.Theme)
@@ -487,7 +487,7 @@ func BlogPostDelete(c *RequestContext) ResponseData {
 	var res ResponseData
 	res.MustWriteTemplate("blog_post_delete.html", blogPostDeleteData{
 		BaseData:  baseData,
-		SubmitUrl: hmnurl.BuildBlogPostDelete(c.CurrentProject.Slug, cd.ThreadID, cd.PostID),
+		SubmitUrl: c.UrlContext.BuildBlogPostDelete(cd.ThreadID, cd.PostID),
 		Post:      templatePost,
 	}, c.Perf)
 	return res
@@ -517,8 +517,7 @@ func BlogPostDeleteSubmit(c *RequestContext) ResponseData {
 	}
 
 	if threadDeleted {
-		projectUrl := UrlForProject(c.CurrentProject)
+		return c.Redirect(c.UrlContext.BuildHomepage(), http.StatusSeeOther)
-		return c.Redirect(projectUrl, http.StatusSeeOther)
 	} else {
 		thread, err := FetchThread(c.Context(), c.Conn, c.CurrentUser, cd.ThreadID, ThreadsQuery{
 			ProjectIDs:  []int{c.CurrentProject.ID},
@@ -529,7 +528,7 @@ func BlogPostDeleteSubmit(c *RequestContext) ResponseData {
 		} else if err != nil {
 			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch thread after blog post delete"))
 		}
-		threadUrl := hmnurl.BuildBlogThread(c.CurrentProject.Slug, thread.Thread.ID, thread.Thread.Title)
+		threadUrl := c.UrlContext.BuildBlogThread(thread.Thread.ID, thread.Thread.Title)
 		return c.Redirect(threadUrl, http.StatusSeeOther)
 	}
 }
@@ -608,9 +607,9 @@ func getCommonBlogData(c *RequestContext) (commonBlogData, bool) {
 	return res, true
 }
 
-func addBlogUrlsToPost(p *templates.Post, projectSlug string, thread *models.Thread, postId int) {
+func addBlogUrlsToPost(urlContext *hmnurl.UrlContext, p *templates.Post, thread *models.Thread, postId int) {
-	p.Url = hmnurl.BuildBlogThreadWithPostHash(projectSlug, thread.ID, thread.Title, postId)
+	p.Url = urlContext.BuildBlogThreadWithPostHash(thread.ID, thread.Title, postId)
-	p.DeleteUrl = hmnurl.BuildBlogPostDelete(projectSlug, thread.ID, postId)
+	p.DeleteUrl = urlContext.BuildBlogPostDelete(thread.ID, postId)
-	p.EditUrl = hmnurl.BuildBlogPostEdit(projectSlug, thread.ID, postId)
+	p.EditUrl = urlContext.BuildBlogPostEdit(thread.ID, postId)
-	p.ReplyUrl = hmnurl.BuildBlogPostReply(projectSlug, thread.ID, postId)
+	p.ReplyUrl = urlContext.BuildBlogPostReply(thread.ID, postId)
 }

src/website/breadcrumb_helper.go

@@ -6,58 +6,58 @@ import (
 	"git.handmade.network/hmn/hmn/src/templates"
 )
 
-func ProjectBreadcrumb(project *models.Project) templates.Breadcrumb {
+func ProjectBreadcrumb(projectUrlContext *hmnurl.UrlContext) templates.Breadcrumb {
 	return templates.Breadcrumb{
-		Name: project.Name,
+		Name: projectUrlContext.ProjectName,
-		Url:  UrlForProject(project),
+		Url:  projectUrlContext.BuildHomepage(),
 	}
 }
 
-func ForumBreadcrumb(projectSlug string) templates.Breadcrumb {
+func ForumBreadcrumb(projectUrlContext *hmnurl.UrlContext) templates.Breadcrumb {
 	return templates.Breadcrumb{
 		Name: "Forums",
-		Url:  hmnurl.BuildForum(projectSlug, nil, 1),
+		Url:  projectUrlContext.BuildForum(nil, 1),
 	}
 }
 
-func SubforumBreadcrumbs(lineageBuilder *models.SubforumLineageBuilder, project *models.Project, subforumID int) []templates.Breadcrumb {
+func SubforumBreadcrumbs(projectUrlContext *hmnurl.UrlContext, lineageBuilder *models.SubforumLineageBuilder, subforumID int) []templates.Breadcrumb {
 	var result []templates.Breadcrumb
 	result = []templates.Breadcrumb{
-		ProjectBreadcrumb(project),
+		ProjectBreadcrumb(projectUrlContext),
-		ForumBreadcrumb(project.Slug),
+		ForumBreadcrumb(projectUrlContext),
 	}
 	subforums := lineageBuilder.GetSubforumLineage(subforumID)
 	slugs := lineageBuilder.GetSubforumLineageSlugs(subforumID)
 	for i, subforum := range subforums {
 		result = append(result, templates.Breadcrumb{
 			Name: subforum.Name,
-			Url:  hmnurl.BuildForum(project.Slug, slugs[0:i+1], 1),
+			Url:  projectUrlContext.BuildForum(slugs[0:i+1], 1),
 		})
 	}
 
 	return result
 }
 
-func ForumThreadBreadcrumbs(lineageBuilder *models.SubforumLineageBuilder, project *models.Project, thread *models.Thread) []templates.Breadcrumb {
+func ForumThreadBreadcrumbs(projectUrlContext *hmnurl.UrlContext, lineageBuilder *models.SubforumLineageBuilder, thread *models.Thread) []templates.Breadcrumb {
-	result := SubforumBreadcrumbs(lineageBuilder, project, *thread.SubforumID)
+	result := SubforumBreadcrumbs(projectUrlContext, lineageBuilder, *thread.SubforumID)
 	result = append(result, templates.Breadcrumb{
 		Name: thread.Title,
-		Url:  hmnurl.BuildForumThread(project.Slug, lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), thread.ID, thread.Title, 1),
+		Url:  projectUrlContext.BuildForumThread(lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), thread.ID, thread.Title, 1),
 	})
 	return result
 }
 
-func BlogBreadcrumb(projectSlug string) templates.Breadcrumb {
+func BlogBreadcrumb(projectUrlContext *hmnurl.UrlContext) templates.Breadcrumb {
 	return templates.Breadcrumb{
 		Name: "Blog",
-		Url:  hmnurl.BuildBlog(projectSlug, 1),
+		Url:  projectUrlContext.BuildBlog(1),
 	}
 }
 
-func BlogThreadBreadcrumbs(projectSlug string, thread *models.Thread) []templates.Breadcrumb {
+func BlogThreadBreadcrumbs(projectUrlContext *hmnurl.UrlContext, thread *models.Thread) []templates.Breadcrumb {
 	result := []templates.Breadcrumb{
-		BlogBreadcrumb(projectSlug),
+		BlogBreadcrumb(projectUrlContext),
-		{Name: thread.Title, Url: hmnurl.BuildBlogThread(projectSlug, thread.ID, thread.Title)},
+		{Name: thread.Title, Url: projectUrlContext.BuildBlogThread(thread.ID, thread.Title)},
 	}
 	return result
 }

src/website/episode_guide.go

@@ -11,7 +11,6 @@ import (
 	"strings"
 
 	"git.handmade.network/hmn/hmn/src/config"
-	"git.handmade.network/hmn/hmn/src/hmnurl"
 	"git.handmade.network/hmn/hmn/src/templates"
 )
 
@@ -53,11 +52,11 @@ func EpisodeList(c *RequestContext) ResponseData {
 	defaultTopic, hasEpisodeGuide := config.Config.EpisodeGuide.Projects[slug]
 
 	if !hasEpisodeGuide {
-		return c.Redirect(UrlForProject(c.CurrentProject), http.StatusSeeOther)
+		return c.Redirect(c.UrlContext.BuildHomepage(), http.StatusSeeOther)
 	}
 
 	if topic == "" {
-		return c.Redirect(hmnurl.BuildEpisodeList(slug, defaultTopic), http.StatusSeeOther)
+		return c.Redirect(c.UrlContext.BuildEpisodeList(defaultTopic), http.StatusSeeOther)
 	}
 
 	allTopics, foundTopic := topicsForProject(slug, topic)
@@ -82,7 +81,7 @@ func EpisodeList(c *RequestContext) ResponseData {
 	for _, t := range allTopics {
 		url := ""
 		if t != foundTopic {
-			url = hmnurl.BuildEpisodeList(slug, t)
+			url = c.UrlContext.BuildEpisodeList(t)
 		}
 		topicLinks = append(topicLinks, templates.Link{LinkText: t, Url: url})
 	}
@@ -114,7 +113,7 @@ func Episode(c *RequestContext) ResponseData {
 	_, hasEpisodeGuide := config.Config.EpisodeGuide.Projects[slug]
 
 	if !hasEpisodeGuide {
-		return c.Redirect(UrlForProject(c.CurrentProject), http.StatusSeeOther)
+		return c.Redirect(c.UrlContext.BuildHomepage(), http.StatusSeeOther)
 	}
 
 	_, foundTopic := topicsForProject(slug, topic)
@@ -150,7 +149,7 @@ func Episode(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		title,
-		[]templates.Breadcrumb{{Name: "Episode Guide", Url: hmnurl.BuildEpisodeList(c.CurrentProject.Slug, foundTopic)}},
+		[]templates.Breadcrumb{{Name: "Episode Guide", Url: c.UrlContext.BuildEpisodeList(foundTopic)}},
 	)
 	res.MustWriteTemplate("episode.html", EpisodeData{
 		BaseData: baseData,

src/website/feed.go

@@ -71,7 +71,7 @@ func Feed(c *RequestContext) ResponseData {
 		BaseData: baseData,
 
 		AtomFeedUrl:    hmnurl.BuildAtomFeed(),
-		MarkAllReadUrl: hmnurl.BuildForumMarkRead(c.CurrentProject.Slug, 0),
+		MarkAllReadUrl: c.UrlContext.BuildForumMarkRead(0),
 		Posts:          posts,
 		Pagination:     pagination,
 	}, c.Perf)
@@ -181,7 +181,7 @@ func AtomFeed(c *RequestContext) ResponseData {
 			projectMap := make(map[int]int) // map[project id]index in slice
 			for _, p := range projects.ToSlice() {
 				project := p.(*projectResult).Project
-				templateProject := templates.ProjectToTemplate(&project, c.Theme)
+				templateProject := templates.ProjectToTemplate(&project, UrlContextForProject(&project).BuildHomepage(), c.Theme)
 				templateProject.UUID = uuid.NewSHA1(uuid.NameSpaceURL, []byte(templateProject.Url)).URN()
 
 				projectIds = append(projectIds, project.ID)

src/website/forums.go

@@ -35,8 +35,6 @@ type forumSubforumData struct {
 	TotalThreads int
 }
 
-type editActionType string
-
 type editorData struct {
 	templates.BaseData
 	SubmitUrl   string
@@ -54,13 +52,13 @@ type editorData struct {
 	UploadUrl   string
 }
 
-func getEditorDataForNew(currentUser *models.User, baseData templates.BaseData, replyPost *templates.Post) editorData {
+func getEditorDataForNew(urlContext *hmnurl.UrlContext, currentUser *models.User, baseData templates.BaseData, replyPost *templates.Post) editorData {
 	result := editorData{
 		BaseData:       baseData,
 		CanEditTitle:   replyPost == nil,
 		PostReplyingTo: replyPost,
 		MaxFileSize:    AssetMaxSize(currentUser),
-		UploadUrl:      hmnurl.BuildAssetUpload(baseData.Project.Subdomain),
+		UploadUrl:      urlContext.BuildAssetUpload(),
 	}
 
 	if replyPost != nil {
@@ -70,7 +68,7 @@ func getEditorDataForNew(currentUser *models.User, baseData templates.BaseData,
 	return result
 }
 
-func getEditorDataForEdit(currentUser *models.User, baseData templates.BaseData, p PostAndStuff) editorData {
+func getEditorDataForEdit(urlContext *hmnurl.UrlContext, currentUser *models.User, baseData templates.BaseData, p PostAndStuff) editorData {
 	return editorData{
 		BaseData:            baseData,
 		Title:               p.Thread.Title,
@@ -78,7 +76,7 @@ func getEditorDataForEdit(currentUser *models.User, baseData templates.BaseData,
 		IsEditing:           true,
 		EditInitialContents: p.CurrentVersion.TextRaw,
 		MaxFileSize:         AssetMaxSize(currentUser),
-		UploadUrl:           hmnurl.BuildAssetUpload(baseData.Project.Subdomain),
+		UploadUrl:           urlContext.BuildAssetUpload(),
 	}
 }
 
@@ -104,7 +102,7 @@ func Forum(c *RequestContext) ResponseData {
 	numPages := utils.NumPages(numThreads, threadsPerPage)
 	page, ok := ParsePageNumber(c, "page", numPages)
 	if !ok {
-		c.Redirect(hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, page), http.StatusSeeOther)
+		c.Redirect(c.UrlContext.BuildForum(currentSubforumSlugs, page), http.StatusSeeOther)
 	}
 	howManyThreadsToSkip := (page - 1) * threadsPerPage
 
@@ -119,7 +117,7 @@ func Forum(c *RequestContext) ResponseData {
 	makeThreadListItem := func(row ThreadAndStuff) templates.ThreadListItem {
 		return templates.ThreadListItem{
 			Title:     row.Thread.Title,
-			Url:       hmnurl.BuildForumThread(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(*row.Thread.SubforumID), row.Thread.ID, row.Thread.Title, 1),
+			Url:       c.UrlContext.BuildForumThread(cd.LineageBuilder.GetSubforumLineageSlugs(*row.Thread.SubforumID), row.Thread.ID, row.Thread.Title, 1),
 			FirstUser: templates.UserToTemplate(row.FirstPostAuthor, c.Theme),
 			FirstDate: row.FirstPost.PostDate,
 			LastUser:  templates.UserToTemplate(row.LastPostAuthor, c.Theme),
@@ -165,7 +163,7 @@ func Forum(c *RequestContext) ResponseData {
 
 			subforums = append(subforums, forumSubforumData{
 				Name:         sfNode.Name,
-				Url:          hmnurl.BuildForum(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(sfNode.ID), 1),
+				Url:          c.UrlContext.BuildForum(cd.LineageBuilder.GetSubforumLineageSlugs(sfNode.ID), 1),
 				Threads:      threads,
 				TotalThreads: numThreads,
 			})
@@ -179,23 +177,23 @@ func Forum(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		fmt.Sprintf("%s Forums", c.CurrentProject.Name),
-		SubforumBreadcrumbs(cd.LineageBuilder, c.CurrentProject, cd.SubforumID),
+		SubforumBreadcrumbs(c.UrlContext, cd.LineageBuilder, cd.SubforumID),
 	)
 
 	var res ResponseData
 	res.MustWriteTemplate("forum.html", forumData{
 		BaseData:     baseData,
-		NewThreadUrl: hmnurl.BuildForumNewThread(c.CurrentProject.Slug, currentSubforumSlugs, false),
+		NewThreadUrl: c.UrlContext.BuildForumNewThread(currentSubforumSlugs, false),
-		MarkReadUrl:  hmnurl.BuildForumMarkRead(c.CurrentProject.Slug, cd.SubforumID),
+		MarkReadUrl:  c.UrlContext.BuildForumMarkRead(cd.SubforumID),
 		Threads:      threads,
 		Pagination: templates.Pagination{
 			Current: page,
 			Total:   numPages,
 
-			FirstUrl:    hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, 1),
+			FirstUrl:    c.UrlContext.BuildForum(currentSubforumSlugs, 1),
-			LastUrl:     hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, numPages),
+			LastUrl:     c.UrlContext.BuildForum(currentSubforumSlugs, numPages),
-			NextUrl:     hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, utils.IntClamp(1, page+1, numPages)),
+			NextUrl:     c.UrlContext.BuildForum(currentSubforumSlugs, utils.IntClamp(1, page+1, numPages)),
-			PreviousUrl: hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, utils.IntClamp(1, page-1, numPages)),
+			PreviousUrl: c.UrlContext.BuildForum(currentSubforumSlugs, utils.IntClamp(1, page-1, numPages)),
 		},
 		Subforums: subforums,
 	}, c.Perf)
@@ -308,7 +306,7 @@ func ForumMarkRead(c *RequestContext) ResponseData {
 	if sfId == 0 {
 		redirUrl = hmnurl.BuildFeed()
 	} else {
-		redirUrl = hmnurl.BuildForum(c.CurrentProject.Slug, lineageBuilder.GetSubforumLineageSlugs(sfId), 1)
+		redirUrl = c.UrlContext.BuildForum(lineageBuilder.GetSubforumLineageSlugs(sfId), 1)
 	}
 	return c.Redirect(redirUrl, http.StatusSeeOther)
 }
@@ -358,17 +356,17 @@ func ForumThread(c *RequestContext) ResponseData {
 	}
 	page, numPages, ok := getPageInfo(c.PathParams["page"], numPosts, threadPostsPerPage)
 	if !ok {
-		urlNoPage := hmnurl.BuildForumThread(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.Title, 1)
+		urlNoPage := c.UrlContext.BuildForumThread(currentSubforumSlugs, thread.ID, thread.Title, 1)
 		return c.Redirect(urlNoPage, http.StatusSeeOther)
 	}
 	pagination := templates.Pagination{
 		Current: page,
 		Total:   numPages,
 
-		FirstUrl:    hmnurl.BuildForumThread(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.Title, 1),
+		FirstUrl:    c.UrlContext.BuildForumThread(currentSubforumSlugs, thread.ID, thread.Title, 1),
-		LastUrl:     hmnurl.BuildForumThread(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.Title, numPages),
+		LastUrl:     c.UrlContext.BuildForumThread(currentSubforumSlugs, thread.ID, thread.Title, numPages),
-		NextUrl:     hmnurl.BuildForumThread(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.Title, utils.IntClamp(1, page+1, numPages)),
+		NextUrl:     c.UrlContext.BuildForumThread(currentSubforumSlugs, thread.ID, thread.Title, utils.IntClamp(1, page+1, numPages)),
-		PreviousUrl: hmnurl.BuildForumThread(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.Title, utils.IntClamp(1, page-1, numPages)),
+		PreviousUrl: c.UrlContext.BuildForumThread(currentSubforumSlugs, thread.ID, thread.Title, utils.IntClamp(1, page-1, numPages)),
 	}
 
 	postsAndStuff, err := FetchPosts(c.Context(), c.Conn, c.CurrentUser, PostsQuery{
@@ -385,11 +383,11 @@ func ForumThread(c *RequestContext) ResponseData {
 	for _, p := range postsAndStuff {
 		post := templates.PostToTemplate(&p.Post, p.Author, c.Theme)
 		post.AddContentVersion(p.CurrentVersion, p.Editor)
-		addForumUrlsToPost(&post, c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, post.ID)
+		addForumUrlsToPost(c.UrlContext, &post, currentSubforumSlugs, thread.ID, post.ID)
 
 		if p.ReplyPost != nil {
 			reply := templates.PostToTemplate(p.ReplyPost, p.ReplyAuthor, c.Theme)
-			addForumUrlsToPost(&reply, c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, reply.ID)
+			addForumUrlsToPost(c.UrlContext, &reply, currentSubforumSlugs, thread.ID, reply.ID)
 			post.ReplyPost = &reply
 		}
 
@@ -418,7 +416,7 @@ func ForumThread(c *RequestContext) ResponseData {
 		}
 	}
 
-	baseData := getBaseData(c, thread.Title, SubforumBreadcrumbs(cd.LineageBuilder, c.CurrentProject, cd.SubforumID))
+	baseData := getBaseData(c, thread.Title, SubforumBreadcrumbs(c.UrlContext, cd.LineageBuilder, cd.SubforumID))
 	baseData.OpenGraphItems = append(baseData.OpenGraphItems, templates.OpenGraphItem{
 		Property: "og:description",
 		Value:    threadResult.FirstPost.Preview,
@@ -429,8 +427,8 @@ func ForumThread(c *RequestContext) ResponseData {
 		BaseData:    baseData,
 		Thread:      templates.ThreadToTemplate(&thread),
 		Posts:       posts,
-		SubforumUrl: hmnurl.BuildForum(c.CurrentProject.Slug, currentSubforumSlugs, 1),
+		SubforumUrl: c.UrlContext.BuildForum(currentSubforumSlugs, 1),
-		ReplyUrl:    hmnurl.BuildForumPostReply(c.CurrentProject.Slug, currentSubforumSlugs, thread.ID, thread.FirstID),
+		ReplyUrl:    c.UrlContext.BuildForumPostReply(currentSubforumSlugs, thread.ID, thread.FirstID),
 		Pagination:  pagination,
 	}, c.Perf)
 	return res
@@ -466,8 +464,7 @@ func ForumPostRedirect(c *RequestContext) ResponseData {
 
 	page := (postIdx / threadPostsPerPage) + 1
 
-	return c.Redirect(hmnurl.BuildForumThreadWithPostHash(
+	return c.Redirect(c.UrlContext.BuildForumThreadWithPostHash(
-		c.CurrentProject.Slug,
 		cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID),
 		cd.ThreadID,
 		post.Thread.Title,
@@ -482,9 +479,9 @@ func ForumNewThread(c *RequestContext) ResponseData {
 		return FourOhFour(c)
 	}
 
-	baseData := getBaseData(c, "Create New Thread", SubforumBreadcrumbs(cd.LineageBuilder, c.CurrentProject, cd.SubforumID))
+	baseData := getBaseData(c, "Create New Thread", SubforumBreadcrumbs(c.UrlContext, cd.LineageBuilder, cd.SubforumID))
-	editData := getEditorDataForNew(c.CurrentUser, baseData, nil)
+	editData := getEditorDataForNew(c.UrlContext, c.CurrentUser, baseData, nil)
-	editData.SubmitUrl = hmnurl.BuildForumNewThread(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), true)
+	editData.SubmitUrl = c.UrlContext.BuildForumNewThread(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), true)
 	editData.SubmitLabel = "Post New Thread"
 
 	var res ResponseData
@@ -549,7 +546,7 @@ func ForumNewThreadSubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to create new forum thread"))
 	}
 
-	newThreadUrl := hmnurl.BuildForumThread(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), threadId, title, 1)
+	newThreadUrl := c.UrlContext.BuildForumThread(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), threadId, title, 1)
 	return c.Redirect(newThreadUrl, http.StatusSeeOther)
 }
 
@@ -572,14 +569,14 @@ func ForumPostReply(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		fmt.Sprintf("Replying to post | %s", cd.SubforumTree[cd.SubforumID].Name),
-		ForumThreadBreadcrumbs(cd.LineageBuilder, c.CurrentProject, &post.Thread),
+		ForumThreadBreadcrumbs(c.UrlContext, cd.LineageBuilder, &post.Thread),
 	)
 
 	replyPost := templates.PostToTemplate(&post.Post, post.Author, c.Theme)
 	replyPost.AddContentVersion(post.CurrentVersion, post.Editor)
 
-	editData := getEditorDataForNew(c.CurrentUser, baseData, &replyPost)
+	editData := getEditorDataForNew(c.UrlContext, c.CurrentUser, baseData, &replyPost)
-	editData.SubmitUrl = hmnurl.BuildForumPostReply(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
+	editData.SubmitUrl = c.UrlContext.BuildForumPostReply(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
 	editData.SubmitLabel = "Submit Reply"
 
 	var res ResponseData
@@ -629,7 +626,7 @@ func ForumPostReplySubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to reply to forum post"))
 	}
 
-	newPostUrl := hmnurl.BuildForumPost(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, newPostId)
+	newPostUrl := c.UrlContext.BuildForumPost(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, newPostId)
 	return c.Redirect(newPostUrl, http.StatusSeeOther)
 }
 
@@ -659,10 +656,10 @@ func ForumPostEdit(c *RequestContext) ResponseData {
 	} else {
 		title = fmt.Sprintf("Editing Post | %s", cd.SubforumTree[cd.SubforumID].Name)
 	}
-	baseData := getBaseData(c, title, ForumThreadBreadcrumbs(cd.LineageBuilder, c.CurrentProject, &post.Thread))
+	baseData := getBaseData(c, title, ForumThreadBreadcrumbs(c.UrlContext, cd.LineageBuilder, &post.Thread))
 
-	editData := getEditorDataForEdit(c.CurrentUser, baseData, post)
+	editData := getEditorDataForEdit(c.UrlContext, c.CurrentUser, baseData, post)
-	editData.SubmitUrl = hmnurl.BuildForumPostEdit(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
+	editData.SubmitUrl = c.UrlContext.BuildForumPostEdit(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
 	editData.SubmitLabel = "Submit Edited Post"
 
 	var res ResponseData
@@ -727,7 +724,7 @@ func ForumPostEditSubmit(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to edit forum post"))
 	}
 
-	postUrl := hmnurl.BuildForumPost(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
+	postUrl := c.UrlContext.BuildForumPost(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID)
 	return c.Redirect(postUrl, http.StatusSeeOther)
 }
 
@@ -754,7 +751,7 @@ func ForumPostDelete(c *RequestContext) ResponseData {
 	baseData := getBaseData(
 		c,
 		fmt.Sprintf("Deleting post in \"%s\" | %s", post.Thread.Title, cd.SubforumTree[cd.SubforumID].Name),
-		ForumThreadBreadcrumbs(cd.LineageBuilder, c.CurrentProject, &post.Thread),
+		ForumThreadBreadcrumbs(c.UrlContext, cd.LineageBuilder, &post.Thread),
 	)
 
 	templatePost := templates.PostToTemplate(&post.Post, post.Author, c.Theme)
@@ -769,7 +766,7 @@ func ForumPostDelete(c *RequestContext) ResponseData {
 	var res ResponseData
 	res.MustWriteTemplate("forum_post_delete.html", forumPostDeleteData{
 		BaseData:  baseData,
-		SubmitUrl: hmnurl.BuildForumPostDelete(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID),
+		SubmitUrl: c.UrlContext.BuildForumPostDelete(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, cd.PostID),
 		Post:      templatePost,
 	}, c.Perf)
 	return res
@@ -799,10 +796,10 @@ func ForumPostDeleteSubmit(c *RequestContext) ResponseData {
 	}
 
 	if threadDeleted {
-		forumUrl := hmnurl.BuildForum(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), 1)
+		forumUrl := c.UrlContext.BuildForum(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), 1)
 		return c.Redirect(forumUrl, http.StatusSeeOther)
 	} else {
-		threadUrl := hmnurl.BuildForumThread(c.CurrentProject.Slug, cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, "", 1) // TODO: Go to the last page of the thread? Or the post before the post we just deleted?
+		threadUrl := c.UrlContext.BuildForumThread(cd.LineageBuilder.GetSubforumLineageSlugs(cd.SubforumID), cd.ThreadID, "", 1) // TODO: Go to the last page of the thread? Or the post before the post we just deleted?
 		return c.Redirect(threadUrl, http.StatusSeeOther)
 	}
 }
@@ -829,7 +826,7 @@ func WikiArticleRedirect(c *RequestContext) ResponseData {
 	lineageBuilder := models.MakeSubforumLineageBuilder(subforumTree)
 	c.Perf.EndBlock()
 
-	dest := UrlForGenericThread(&thread.Thread, lineageBuilder, c.CurrentProject.Slug)
+	dest := UrlForGenericThread(c.UrlContext, &thread.Thread, lineageBuilder)
 	return c.Redirect(dest, http.StatusFound)
 }
 
@@ -928,11 +925,11 @@ func validateSubforums(lineageBuilder *models.SubforumLineageBuilder, project *m
 	return subforumId, valid
 }
 
-func addForumUrlsToPost(p *templates.Post, projectSlug string, subforums []string, threadId int, postId int) {
+func addForumUrlsToPost(urlContext *hmnurl.UrlContext, p *templates.Post, subforums []string, threadId int, postId int) {
-	p.Url = hmnurl.BuildForumPost(projectSlug, subforums, threadId, postId)
+	p.Url = urlContext.BuildForumPost(subforums, threadId, postId)
-	p.DeleteUrl = hmnurl.BuildForumPostDelete(projectSlug, subforums, threadId, postId)
+	p.DeleteUrl = urlContext.BuildForumPostDelete(subforums, threadId, postId)
-	p.EditUrl = hmnurl.BuildForumPostEdit(projectSlug, subforums, threadId, postId)
+	p.EditUrl = urlContext.BuildForumPostEdit(subforums, threadId, postId)
-	p.ReplyUrl = hmnurl.BuildForumPostReply(projectSlug, subforums, threadId, postId)
+	p.ReplyUrl = urlContext.BuildForumPostReply(subforums, threadId, postId)
 }
 
 // Takes a template post and adds information about how many posts the user has made

src/website/landing.go

@@ -74,7 +74,7 @@ func Index(c *RequestContext) ResponseData {
 		c.Logger.Warn().Err(err).Msg("failed to fetch latest posts")
 	}
 	for _, p := range posts {
-		item := PostToTimelineItem(lineageBuilder, &p.Post, &p.Thread, &p.Project, p.Author, c.Theme)
+		item := PostToTimelineItem(UrlContextForProject(&p.Project), lineageBuilder, &p.Post, &p.Thread, p.Author, c.Theme)
 		if p.Thread.Type == models.ThreadTypeProjectBlogPost && p.Post.ID == p.Thread.FirstID {
 			// blog post
 			item.Description = template.HTML(p.CurrentVersion.TextParsed)
@@ -95,7 +95,7 @@ func Index(c *RequestContext) ResponseData {
 	var newsPostItem *templates.TimelineItem
 	if len(newsThreads) > 0 {
 		t := newsThreads[0]
-		item := PostToTimelineItem(lineageBuilder, &t.FirstPost, &t.Thread, &t.Project, t.FirstPostAuthor, c.Theme)
+		item := PostToTimelineItem(UrlContextForProject(&t.Project), lineageBuilder, &t.FirstPost, &t.Thread, t.FirstPostAuthor, c.Theme)
 		item.OwnerAvatarUrl = ""
 		item.Breadcrumbs = nil
 		item.TypeTitle = ""
@@ -167,7 +167,7 @@ func Index(c *RequestContext) ResponseData {
 		StreamsUrl:     hmnurl.BuildStreams(),
 		ShowcaseUrl:    hmnurl.BuildShowcase(),
 		AtomFeedUrl:    hmnurl.BuildAtomFeed(),
-		MarkAllReadUrl: hmnurl.BuildForumMarkRead(models.HMNProjectSlug, 0),
+		MarkAllReadUrl: hmnurl.HMNProjectContext.BuildForumMarkRead(0),
 
 		WheelJamUrl: hmnurl.BuildJamIndex(),
 	}, c.Perf)

src/website/post_helper.go

@@ -7,26 +7,26 @@ import (
 )
 
 // NOTE(asaf): Please don't use these if you already know the kind of the thread beforehand. Just call the appropriate build function.
-func UrlForGenericThread(thread *models.Thread, lineageBuilder *models.SubforumLineageBuilder, projectSlug string) string {
+func UrlForGenericThread(urlContext *hmnurl.UrlContext, thread *models.Thread, lineageBuilder *models.SubforumLineageBuilder) string {
 	switch thread.Type {
 	case models.ThreadTypeProjectBlogPost:
-		return hmnurl.BuildBlogThread(projectSlug, thread.ID, thread.Title)
+		return urlContext.BuildBlogThread(thread.ID, thread.Title)
 	case models.ThreadTypeForumPost:
-		return hmnurl.BuildForumThread(projectSlug, lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), thread.ID, thread.Title, 1)
+		return urlContext.BuildForumThread(lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), thread.ID, thread.Title, 1)
 	}
 
-	return hmnurl.BuildOfficialProjectHomepage(projectSlug) // TODO: both official and personal projects
+	return urlContext.BuildHomepage()
 }
 
-func UrlForGenericPost(thread *models.Thread, post *models.Post, lineageBuilder *models.SubforumLineageBuilder, projectSlug string) string {
+func UrlForGenericPost(urlContext *hmnurl.UrlContext, thread *models.Thread, post *models.Post, lineageBuilder *models.SubforumLineageBuilder) string {
 	switch post.ThreadType {
 	case models.ThreadTypeProjectBlogPost:
-		return hmnurl.BuildBlogThreadWithPostHash(projectSlug, post.ThreadID, thread.Title, post.ID)
+		return urlContext.BuildBlogThreadWithPostHash(post.ThreadID, thread.Title, post.ID)
 	case models.ThreadTypeForumPost:
-		return hmnurl.BuildForumPost(projectSlug, lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), post.ThreadID, post.ID)
+		return urlContext.BuildForumPost(lineageBuilder.GetSubforumLineageSlugs(*thread.SubforumID), post.ThreadID, post.ID)
 	}
 
-	return hmnurl.BuildOfficialProjectHomepage(projectSlug) // TODO: both official and personal projects
+	return urlContext.BuildHomepage()
 }
 
 var PostTypeMap = map[models.ThreadType][]templates.PostType{
@@ -47,33 +47,33 @@ var ThreadTypeDisplayNames = map[models.ThreadType]string{
 	models.ThreadTypeForumPost:       "Forums",
 }
 
-func GenericThreadBreadcrumbs(lineageBuilder *models.SubforumLineageBuilder, project *models.Project, thread *models.Thread) []templates.Breadcrumb {
+func GenericThreadBreadcrumbs(urlContext *hmnurl.UrlContext, lineageBuilder *models.SubforumLineageBuilder, thread *models.Thread) []templates.Breadcrumb {
 	var result []templates.Breadcrumb
 	if thread.Type == models.ThreadTypeForumPost {
-		result = SubforumBreadcrumbs(lineageBuilder, project, *thread.SubforumID)
+		result = SubforumBreadcrumbs(urlContext, lineageBuilder, *thread.SubforumID)
 	} else {
 		result = []templates.Breadcrumb{
 			{
-				Name: project.Name,
+				Name: urlContext.ProjectName,
-				Url:  UrlForProject(project),
+				Url:  urlContext.BuildHomepage(),
 			},
 			{
 				Name: ThreadTypeDisplayNames[thread.Type],
-				Url:  BuildProjectRootResourceUrl(project.Slug, thread.Type),
+				Url:  BuildProjectRootResourceUrl(urlContext, thread.Type),
 			},
 		}
 	}
 	return result
 }
 
-func BuildProjectRootResourceUrl(projectSlug string, kind models.ThreadType) string {
+func BuildProjectRootResourceUrl(urlContext *hmnurl.UrlContext, kind models.ThreadType) string {
 	switch kind {
 	case models.ThreadTypeProjectBlogPost:
-		return hmnurl.BuildBlog(projectSlug, 1)
+		return urlContext.BuildBlog(1)
 	case models.ThreadTypeForumPost:
-		return hmnurl.BuildForum(projectSlug, nil, 1)
+		return urlContext.BuildForum(nil, 1)
 	}
-	return hmnurl.BuildOfficialProjectHomepage(projectSlug) // TODO: both official and personal projects
+	return urlContext.BuildHomepage()
 }
 
 func MakePostListItem(
@@ -88,11 +88,13 @@ func MakePostListItem(
 ) templates.PostListItem {
 	var result templates.PostListItem
 
+	urlContext := UrlContextForProject(project)
+
 	result.Title = thread.Title
 	result.User = templates.UserToTemplate(user, currentTheme)
 	result.Date = post.PostDate
 	result.Unread = unread
-	result.Url = UrlForGenericPost(thread, post, lineageBuilder, project.Slug)
+	result.Url = UrlForGenericPost(urlContext, thread, post, lineageBuilder)
 	result.Preview = post.Preview
 
 	postType := templates.PostTypeUnknown
@@ -108,7 +110,7 @@ func MakePostListItem(
 	result.PostTypePrefix = PostTypePrefix[result.PostType]
 
 	if includeBreadcrumbs {
-		result.Breadcrumbs = GenericThreadBreadcrumbs(lineageBuilder, project, thread)
+		result.Breadcrumbs = GenericThreadBreadcrumbs(urlContext, lineageBuilder, thread)
 	}
 
 	return result

src/website/project_helper.go

@@ -3,8 +3,9 @@ package website
 import (
 	"context"
 
-	"git.handmade.network/hmn/hmn/src/db"
 	"git.handmade.network/hmn/hmn/src/hmnurl"
+
+	"git.handmade.network/hmn/hmn/src/db"
 	"git.handmade.network/hmn/hmn/src/models"
 	"git.handmade.network/hmn/hmn/src/oops"
 )
@@ -388,10 +389,11 @@ func FetchProjectOwners(
 	return projectOwners[0].Owners, nil
 }
 
-func UrlForProject(p *models.Project) string {
+func UrlContextForProject(p *models.Project) *hmnurl.UrlContext {
-	if p.Personal {
+	return &hmnurl.UrlContext{
-		return hmnurl.BuildPersonalProject(p.ID, models.GeneratePersonalProjectSlug(p.Name))
+		PersonalProject: p.Personal,
-	} else {
+		ProjectID:       p.ID,
-		return hmnurl.BuildOfficialProjectHomepage(p.Slug)
+		ProjectSlug:     p.Slug,
+		ProjectName:     p.Name,
 	}
 }

src/website/projects.go

@@ -62,7 +62,7 @@ func ProjectIndex(c *RequestContext) ResponseData {
 	var restProjects []templates.Project
 	now := time.Now()
 	for _, p := range officialProjects {
-		templateProject := templates.ProjectToTemplate(&p.Project, c.Theme)
+		templateProject := templates.ProjectToTemplate(&p.Project, UrlContextForProject(&p.Project).BuildHomepage(), c.Theme)
 		if p.Project.Slug == "hero" {
 			// NOTE(asaf): Handmade Hero gets special treatment. Must always be first in the list.
 			handmadeHero = &templateProject
@@ -121,7 +121,11 @@ func ProjectIndex(c *RequestContext) ResponseData {
 			if i >= maxPersonalProjects {
 				break
 			}
-			personalProjects = append(personalProjects, templates.ProjectToTemplate(&p.Project, c.Theme))
+			personalProjects = append(personalProjects, templates.ProjectToTemplate(
+				&p.Project,
+				UrlContextForProject(&p.Project).BuildHomepage(),
+				c.Theme,
+			))
 		}
 	}
 
@@ -136,7 +140,7 @@ func ProjectIndex(c *RequestContext) ResponseData {
 		PersonalProjects: personalProjects,
 
 		ProjectAtomFeedUrl: hmnurl.BuildAtomFeedForProjects(),
-		WIPForumUrl:        hmnurl.BuildForum(models.HMNProjectSlug, []string{"wip"}, 1),
+		WIPForumUrl:        hmnurl.HMNProjectContext.BuildForum([]string{"wip"}, 1),
 	}, c.Perf)
 	return res
 }
@@ -249,7 +253,7 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 		Value:    c.CurrentProject.Blurb,
 	})
 
-	projectHomepageData.Project = templates.ProjectToTemplate(c.CurrentProject, c.Theme)
+	projectHomepageData.Project = templates.ProjectToTemplate(c.CurrentProject, c.UrlContext.BuildHomepage(), c.Theme)
 	for _, owner := range owners {
 		projectHomepageData.Owners = append(projectHomepageData.Owners, templates.UserToTemplate(owner, c.Theme))
 	}
@@ -268,7 +272,7 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 				"unapproved",
 				fmt.Sprintf(
 					"NOTICE: This project has not yet been submitted for approval. It is only visible to owners. Please <a href=\"%s\">submit it for approval</a> when the project content is ready for review.",
-					hmnurl.BuildProjectEdit(c.CurrentProject.Slug, "submit"),
+					c.UrlContext.BuildProjectEdit("submit"),
 				),
 			)
 		case models.ProjectLifecycleApprovalRequired:
@@ -309,10 +313,10 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 
 	for _, post := range postQueryResult.ToSlice() {
 		projectHomepageData.RecentActivity = append(projectHomepageData.RecentActivity, PostToTimelineItem(
+			c.UrlContext,
 			lineageBuilder,
 			&post.(*postQuery).Post,
 			&post.(*postQuery).Thread,
-			c.CurrentProject,
 			&post.(*postQuery).Author,
 			c.Theme,
 		))

src/website/requesthandling.go

@@ -156,6 +156,7 @@ type RequestContext struct {
 	CurrentUser    *models.User
 	CurrentSession *models.Session
 	Theme          string
+	UrlContext     *hmnurl.UrlContext
 
 	Perf *perf.RequestPerf
 

src/website/routes.go

@@ -251,9 +251,8 @@ func NewWebsiteRoutes(longRequestContext context.Context, conn *pgxpool.Pool, pe
 		rb.GET(hmnurl.RegexBlogPostDelete, authMiddleware(BlogPostDelete))
 		rb.POST(hmnurl.RegexBlogPostDelete, authMiddleware(csrfMiddleware(BlogPostDeleteSubmit)))
 		rb.GET(hmnurl.RegexBlogsRedirect, func(c *RequestContext) ResponseData {
-			return c.Redirect(hmnurl.ProjectUrl(
+			return c.Redirect(c.UrlContext.Url(
 				fmt.Sprintf("blog%s", c.PathParams["remainder"]), nil,
-				c.CurrentProject.Slug,
 			), http.StatusMovedPermanently)
 		})
 	}
@@ -281,7 +280,7 @@ func NewWebsiteRoutes(longRequestContext context.Context, conn *pgxpool.Pool, pe
 
 				if !p.Project.Personal {
 					// TODO: Redirect to the same page on the other prefix
-					return c.Redirect(hmnurl.BuildOfficialProjectHomepage(p.Project.Slug), http.StatusSeeOther)
+					return c.Redirect(UrlContextForProject(&p.Project).BuildHomepage(), http.StatusSeeOther)
 				}
 
 				if c.PathParams["slug"] != models.GeneratePersonalProjectSlug(p.Project.Name) {
@@ -290,6 +289,7 @@ func NewWebsiteRoutes(longRequestContext context.Context, conn *pgxpool.Pool, pe
 				}
 
 				c.CurrentProject = &p.Project
+				c.UrlContext = UrlContextForProject(c.CurrentProject)
 
 				return h(c)
 			})
@@ -458,15 +458,15 @@ func LoadCommonWebsiteData(c *RequestContext) (bool, ResponseData) {
 		if c.CurrentProject == nil {
 			panic("failed to load project data")
 		}
+
+		c.UrlContext = UrlContextForProject(c.CurrentProject)
 	}
 
-	theme := "light"
+	c.Theme = "light"
 	if c.CurrentUser != nil && c.CurrentUser.DarkTheme {
-		theme = "dark"
+		c.Theme = "dark"
 	}
 
-	c.Theme = theme
-
 	return true, ResponseData{}
 }
 

src/website/timeline_helper.go

@@ -24,18 +24,18 @@ var TimelineTypeTitleMap = map[models.ThreadType]TimelineTypeTitles{
 }
 
 func PostToTimelineItem(
+	urlContext *hmnurl.UrlContext,
 	lineageBuilder *models.SubforumLineageBuilder,
 	post *models.Post,
 	thread *models.Thread,
-	project *models.Project,
 	owner *models.User,
 	currentTheme string,
 ) templates.TimelineItem {
 	item := templates.TimelineItem{
 		Date:        post.PostDate,
 		Title:       thread.Title,
-		Breadcrumbs: GenericThreadBreadcrumbs(lineageBuilder, project, thread),
+		Breadcrumbs: GenericThreadBreadcrumbs(urlContext, lineageBuilder, thread),
-		Url:         UrlForGenericPost(thread, post, lineageBuilder, project.Slug),
+		Url:         UrlForGenericPost(urlContext, thread, post, lineageBuilder),
 
 		OwnerAvatarUrl: templates.UserAvatarUrl(owner, currentTheme),
 		OwnerName:      owner.BestName(),

src/website/user.go

@@ -121,7 +121,11 @@ func UserProfile(c *RequestContext) ResponseData {
 	templateProjects := make([]templates.Project, 0, len(projectQuerySlice))
 	for _, projectRow := range projectQuerySlice {
 		projectData := projectRow.(*projectQuery)
-		templateProjects = append(templateProjects, templates.ProjectToTemplate(&projectData.Project, c.Theme))
+		templateProjects = append(templateProjects, templates.ProjectToTemplate(
+			&projectData.Project,
+			UrlContextForProject(&projectData.Project).BuildHomepage(),
+			c.Theme,
+		))
 	}
 	c.Perf.EndBlock()
 
@@ -166,10 +170,10 @@ func UserProfile(c *RequestContext) ResponseData {
 
 	for _, post := range posts {
 		timelineItems = append(timelineItems, PostToTimelineItem(
+			UrlContextForProject(&post.Project),
 			lineageBuilder,
 			&post.Post,
 			&post.Thread,
-			&post.Project,
 			profileUser,
 			c.Theme,
 		))