From d6abdd4173298ae17a8fb12ff0afa05d7ce6dcfe Mon Sep 17 00:00:00 2001
From: sejo <sejo@texto-plano.xyz>
Date: Mon, 13 Dec 2021 19:34:01 -0600
Subject: [PATCH] generate toc.ncx from index

---
 example-gpub/metadata.txt                     |  1 +
 g2e.awk                                       | 57 ++++++++++++-------
 template-epub/OEBPS/content-header.opf        |  2 +-
 .../OEBPS/{toc.ncx => toc-header.ncx}         | 14 +----
 template-epub/OEBPS/toc-navmap.ncx            |  6 ++
 5 files changed, 49 insertions(+), 31 deletions(-)
 rename template-epub/OEBPS/{toc.ncx => toc-header.ncx} (66%)
 create mode 100644 template-epub/OEBPS/toc-navmap.ncx

diff --git a/example-gpub/metadata.txt b/example-gpub/metadata.txt
index c3e7803..f0d1c45 100644
--- a/example-gpub/metadata.txt
+++ b/example-gpub/metadata.txt
@@ -7,3 +7,4 @@ published: 2021
 publishDate: 2021-12-13
 version: 1
 description: this is an example book!
+id: 123456789X
diff --git a/g2e.awk b/g2e.awk
index 4589339..ad127b9 100644
--- a/g2e.awk
+++ b/g2e.awk
@@ -33,26 +33,30 @@ BEGIN{
 	system( "cp -ru " epubtdir "META-INF " epubodir )
 	system( "cp -u " epubtdir "mimetype " epubodir )
 
-	content = ""
-	content = write_template( epubtdir "OEBPS/content-header.opf" )
+	RS = "\f" # to get the whole file in one getline
+	getline templates["content-header.opf"] < (epubtdir "OEBPS/content-header.opf")
+	getline templates["toc-header.ncx"] < (epubtdir "OEBPS/toc-header.ncx")
+	getline templates["toc-navmap.ncx"] < (epubtdir "OEBPS/toc-navmap.ncx")
+
+	RS = "\n" # return to normal
+
+	content = write_template( "content-header.opf", meta )
+	toc = write_template( "toc-header.ncx", meta )
 
 	spinetoc = "  <spine toc=\"ncx\">\n"
 }
 
-# write the template into output, replacing {keys} with contents of meta["keys"]
-function write_template( templatepath ){
+# write the template into output, replacing {keys} with contents of values["keys"]
+function write_template( templatek, values ){
 	output = ""
-	while( getline < templatepath ){
-		if(match($0,/\{[^{}]+\}/)){ # has {key}
-			key = substr($0,RSTART+1,RLENGTH-2)
-			output = output substr($0, 1, RSTART-1) # before {key}
-			output = output meta[key]
-			output = output substr($0, RSTART+RLENGTH) "\n"
-		}
-		else{ # normal line
-			output = output $0 "\n"
-		}
+	line = templates[templatek]
+	while(match(line,/\{[^{}]+\}/)){ # has {key}
+		key = substr(line,RSTART+1,RLENGTH-2)
+		output = output substr(line, 1, RSTART-1) # before {key}
+		output = output values[key]
+		line = substr(line, RSTART+RLENGTH)
 	}
+	output = output line "\n"
 	return output
 }
 
@@ -60,19 +64,34 @@ function write_template( templatepath ){
 ARGIND==1 && /^=>/{
 	id = $2
 	sub(/.gmi$/,"",id)
-	content = content "    <item id=\""id"\" href=\""id".xhtml\" media-type=\"application/xhtml+xml\"/>\n"
-	spinetoc = spinetoc "    <itemref idref=\""id"\" />\n"
+	name = $3
+	for(i=4;i<=NF;i++) name = name " " $i
+
+	ch["id"] = id
+	ch["name"] = name
+	ch["num"]++
+
+	content = content "    <item id=\"" id "\" href=\"" id ".xhtml\" media-type=\"application/xhtml+xml\"/>\n"
+	spinetoc = spinetoc "    <itemref idref=\"" id "\" />\n"
+
+	toc = toc write_template( "toc-navmap.ncx", ch )
+
 }
-# content files
+# when finished reading the index:
 ARGIND==2 && FNR==1{
 	content = content "  </manifest>\n\n" spinetoc "  </spine>\n\n</package>"
 	printf content > epubodir "OEBPS/content.opf"
+
+	toc = toc "</ncx>"
+	printf toc > epubodir "OEBPS/toc.ncx"
 }
+
+# content files
 ARGIND>1{
-	print $0
+#	print $0
 }
 END{
-#	for(k in meta) print k, meta[k]
+
 }
 
 
diff --git a/template-epub/OEBPS/content-header.opf b/template-epub/OEBPS/content-header.opf
index da00585..93b2339 100644
--- a/template-epub/OEBPS/content-header.opf
+++ b/template-epub/OEBPS/content-header.opf
@@ -4,7 +4,7 @@
   <metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
     <dc:title>{title}</dc:title>
     <dc:language>{language}</dc:language>
-    <dc:identifier id="BookId" opf:scheme="ISBN">123456789X</dc:identifier>
+    <dc:identifier id="BookId" opf:scheme="ISBN">{id}</dc:identifier>
     <dc:creator opf:role="aut">{author}</dc:creator>
     <dc:description>{description}</dc:description>
     <dc:date>{publishDate}</dc:date>
diff --git a/template-epub/OEBPS/toc.ncx b/template-epub/OEBPS/toc-header.ncx
similarity index 66%
rename from template-epub/OEBPS/toc.ncx
rename to template-epub/OEBPS/toc-header.ncx
index ca1522a..636d3b2 100644
--- a/template-epub/OEBPS/toc.ncx
+++ b/template-epub/OEBPS/toc-header.ncx
@@ -8,25 +8,17 @@
 <!-- The following four metadata items are required for all NCX documents,
 including those that conform to the relaxed constraints of OPS 2.0 -->
 
-    <meta name="dtb:uid" content="123456789X"/> <!-- same as in .opf -->
+    <meta name="dtb:uid" content="{id}"/> <!-- same as in .opf -->
     <meta name="dtb:depth" content="1"/> <!-- 1 or higher -->
     <meta name="dtb:totalPageCount" content="0"/> <!-- must be 0 -->
     <meta name="dtb:maxPageNumber" content="0"/> <!-- must be 0 -->
   </head>
 
   <docTitle>
-    <text>Pride and Prejudice</text>
+    <text>{title}</text>
   </docTitle>
 
   <docAuthor>
-    <text>Austen, Jane</text>
+    <text>{author}</text>
   </docAuthor>
 
-  <navMap>
-    <navPoint class="chapter" id="chapter1" playOrder="1">
-      <navLabel><text>Chapter 1</text></navLabel>
-      <content src="chapter1.xhtml"/>
-    </navPoint>
-  </navMap>
-
-</ncx>
\ No newline at end of file
diff --git a/template-epub/OEBPS/toc-navmap.ncx b/template-epub/OEBPS/toc-navmap.ncx
new file mode 100644
index 0000000..c5f439e
--- /dev/null
+++ b/template-epub/OEBPS/toc-navmap.ncx
@@ -0,0 +1,6 @@
+  <navMap>
+    <navPoint class="chapter" id="{id}" playOrder="{num}">
+      <navLabel><text>{name}</text></navLabel>
+      <content src="{id}.xhtml"/>
+    </navPoint>
+  </navMap>