created template and template reading

Makefile

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+clean:
+	rm example-book.gpub
+gpub:
+	cd example-gpub; zip -r ../example-book.gpub *; cd -

example-gpub/book/chapter1.gmi

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+# chapter 1: an example
+
+hello!

example-gpub/book/chapter2.gmi

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+# chapter 2: another example
+
+hola!

example-gpub/book/chapter3.gmi

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+# chapter 3: yet another
+
+this is chapter 3!

example-gpub/book/index.gmi

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+# example book
+
+hello!
+
+=> chapter1.gmi chapter 1: an example
+=> chapter2.gmi chapter 2: another example
+=> chapter3.gmi chapter 3: yet another
+
+yay

example-gpub/metadata.txt

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+title: an example book
+author: sejo
+gpubVersion: 1.0.0
+index: book/index.gmi
+language: en
+published: 2021
+version: 1

g2e.awk

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+# awk -f g2e.awk example-gpub/
+BEGIN{
+	gpubdir = ARGV[1]
+	metadatafile = gpubdir "metadata.txt"
+
+	# read metadata file fields
+	while( getline < metadatafile ){
+		key = $1
+		sub(":","",key)
+		value = $2
+		for(i=3;i<=NF;i++) value = value " " $i
+
+		meta[key] = value
+
+		# set index file as an argument to be read
+		if(key == "index" ){
+			ARGV[1] = (gpubdir value) # overwrite argument 1
+			# store index dirname:
+			indexdirname = value
+			sub(/[^/]+\.gmi$/,"",indexdirname)
+		}
+	}
+
+	# read linked files from index and append as arguments
+	while( getline < (gpubdir meta["index"]) ){
+		if($1~"=>") ARGV[ARGC++] = gpubdir indexdirname $2
+	}
+}
+# index file
+ARGIND==1{
+
+}
+# content files
+ARGIND>1{
+	print $0
+}
+END{
+#	for(k in meta) print k, meta[k]
+}
+
+

template-epub/META-INF/container.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
+  <rootfiles>
+    <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>
+  </rootfiles>
+</container>

template-epub/OEBPS/content-header.opf

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+<?xml version="1.0"?>
+<package version="2.0" xmlns="http://www.idpf.org/2007/opf" unique-identifier="BookId">
+
+  <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:creator opf:role="aut">{author}</dc:creator>
+		<dc:description>{description}</dc:description>
+		<dc:date>{publishDate}</dc:date>
+  </metadata>
+

template-epub/OEBPS/content.opf

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+<?xml version="1.0"?>
+<package version="2.0" xmlns="http://www.idpf.org/2007/opf" unique-identifier="BookId">
+
+  <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:creator opf:role="aut">{author}</dc:creator>
+		<dc:description>{description}</dc:description>
+		<dc:date>{publishDate}</dc:date>
+  </metadata>
+
+  <manifest>
+    <item id="chapter1" href="chapter1.xhtml" media-type="application/xhtml+xml"/>
+    <item id="appendix" href="appendix.xhtml" media-type="application/xhtml+xml"/>
+    <item id="stylesheet" href="style.css" media-type="text/css"/>
+    <item id="ch1-pic" href="ch1-pic.png" media-type="image/png"/>
+    <item id="myfont" href="css/myfont.otf" media-type="application/x-font-opentype"/>
+    <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
+  </manifest>
+
+  <spine toc="ncx">
+    <itemref idref="chapter1" />
+    <itemref idref="appendix" />
+  </spine>
+
+</package>

template-epub/mimetype

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+application/epub+zip