From 3c628e3df74e205556937d7552d1829aa63792f4 Mon Sep 17 00:00:00 2001
From: Matt Mascarenhas <matt@handmadedev.org>
Date: Fri, 5 May 2017 08:18:58 +0100
Subject: [PATCH] hmml_to_youtube.c: Deduplicate URLs [#9]

---
 hmml_to_youtube/hmml_to_youtube.c | 37 +++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/hmml_to_youtube/hmml_to_youtube.c b/hmml_to_youtube/hmml_to_youtube.c
index 97cdd61..401690c 100644
--- a/hmml_to_youtube/hmml_to_youtube.c
+++ b/hmml_to_youtube/hmml_to_youtube.c
@@ -17,6 +17,12 @@ typedef unsigned int bool;
 #define TRUE 1
 #define FALSE 0
 
+typedef struct
+{
+    unsigned int UniqueRefs;
+    char RefID[1024][32];
+} ref_info;
+
 typedef struct
 {
     char *Location;
@@ -111,6 +117,7 @@ main(int ArgC, char **Args)
             return 1;
         }
 
+        ref_info Refs = { 0 };
         ClaimBuffer(MemoryArena, &ClaimedMemory, &Errors, 1024 * 32);
 
         char OutFilename[StringLength(Args[FileIndex]) + 5];
@@ -195,6 +202,35 @@ main(int ArgC, char **Args)
                         if(RefIndex < Anno->reference_count &&
                                 InPtr - Anno->text == Anno->references[RefIndex].offset)
                         {
+                            char *RefID;
+
+                            if(Anno->references[RefIndex].isbn)
+                            {
+                                RefID = Anno->references[RefIndex].isbn;
+                            }
+                            else if(Anno->references[RefIndex].url)
+                            {
+                                RefID = Anno->references[RefIndex].url;
+                            }
+                            else
+                            {
+                                fprintf(stderr, "%s: Reference must contain an ISBN or URL\n", Args[FileIndex]);
+                                hmml_free(&HMML);
+                                free(MemoryArena);
+                                return 1;
+                            }
+
+                            int i;
+                            for(i = 0; i < Refs.UniqueRefs; ++i)
+                            {
+                                if(!StringsDiffer(Refs.RefID[i], RefID))
+                                {
+                                    goto SkipRef;
+                                }
+                            }
+                            sprintf(Refs.RefID[i], RefID);
+                            ++Refs.UniqueRefs;
+
                             if(Anno->references[RefIndex].offset == InOffset)
                             {
                                 if(Out.Ptr[-1] != '"' && Out.Ptr[-1] != ' ')
@@ -244,6 +280,7 @@ main(int ArgC, char **Args)
                                     OutColumn += CopyStringToBuffer(&Out, "%s", Anno->references[RefIndex].url);
                                 }
                             }
+SkipRef:
                             ++RefIndex;
                         }