src/gistatic.in: Initial sh version

I got a bit frustrated that libgit2 didn't offer an API
or "git archive" commands.  I started implementing generating tarballs
from scratch in src/tar.c and I'm quite liking it: the specification is
very small, and the code can be very simple, since all I'm doing is
writing fresh tarballs, and not reading or updating them.

However I felt a bit locked-in to libgit2 itself, and what a detour from
my original goal that is, and the question "what should libgit2 provide"
came up to my mind.  This made me realize that libgit2 is playing
catch-up with Git itself, for as long as Git doesn't explicit has an
explicit API, a standard, a public version of its internal libgit.a, or
something like that.  In fact, I'm locked in to Git, even.

So even though a C version would probably be much faster, it wouldn't
really have less dependencies, and that's what I'm actually optimising
for: having the software be as portable as possible.  On that front, C
is unbeatable with sh as a close second.  But the extreme portability
of C aren't being fully exploited here: libgit2 does depend on non-POSIX
things like CMake (and quick grep even shows
references to -D_GNU_SOURCE!!), and Git's Makefile itself isn't POSIX
at all.  The point is: by depending on either Git or libgit2, I'm
already loosing many selling points of writing the software in C, and
sh becomes much more attractive.  Had existed a common DVCS interface
that could make me decouple gistatic from Git somehow I would insist a
bit more in C, but now I'm switching to sh.

The fact that I was able to get further with sh in one sitting than I
did with C shows that a) I'm a bit less fluent in C than I would like
(at least for now ^^) and b) that it is actually much simpler to do.

I am quite satisfied with the quality of C code that I got so far.  The
error handling and propagation is pretty robust, and the implementation
is very disciplined.  I did most of the development with Valgrind, and
other sanitizers would help even further, with some fuzzers on top.

3 files changed, 756 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index 8a60a57..3e18645 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /public/
+/src/gistatic
 /src/config.h
 /libgistatic.a
 /gistatic
diff --git a/Makefile b/Makefile
index 5aa3159..48a52ef 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ LDLIBS       = -lgit2
 		-e 's:@DATE@:$(DATE):g'       \
 		-e 's:@NAME@:$(NAME):g'       \
 		< $< > $@
+	if [ -x $< ]; then chmod +x $@; fi
 
 .c.o:
 	$(CC) $(CFLAGS)        -o $@ -c $<
@@ -44,7 +45,7 @@ all-objects = $(lib-objects) src/main.o
 t-objects   = $(sources:.c=.to) src/tests-lib.to src/main.to
 
 
-all: libgistatic.a gistatic $(manpages)
+all: libgistatic.a gistatic src/gistatic $(manpages)
 
 libgistatic.a: $(lib-objects)
 	$(AR) $(ARFLAGS) $@ $(lib-objects)
@@ -85,7 +86,7 @@ clean:
 	rm -rf \
 		public/ $(manpages) README.*.md CHANGELOG.*.md messages.mo \
 		vgcore.* tmp/ src/config.h $(all-objects) $(t-objects)     \
-		libgistatic.a gistatic gistatic-tests                      \
+		libgistatic.a gistatic gistatic-tests src/gistatic         \
 		tests/resources/repositories/repo-1/.git                   \
 		tests/resources/repositories/repo-2/.git
 
diff --git a/src/gistatic.in b/src/gistatic.in
new file mode 100755
index 0000000..f18742a
--- /dev/null
+++ b/src/gistatic.in
@@ -0,0 +1,752 @@
+#!/bin/sh
+# shellcheck disable=2034 disable=2059
+set -eu
+
+MSG_USAGE_EN='Usage:
+  @NAME@ -i -o DIRECTORY REPOSITORY...
+  @NAME@    -o DIRECTORY -u CLONE_URL REPOSITORY
+  @NAME@ [-hV]
+'
+
+MSG_HELP_EN='Options:
+  -i             build the index page of the repositories
+  -u CLONE_URL   address to be shown alongside "git clone"
+  -o DIRECTORY   output where to place the generated files
+  -h, --help     show this help
+  -V, --version  print the version information
+
+See "man @NAME@" for more information.'
+
+MSG_MISSING_CLIARG_EN='Missing %s\n'
+MSG_INCOMPATIBLE_OPTIONS_EN='Incompatible options -u and -i'
+MSG_MISSING_ARGS_EN='Missing [PATH | [PATHS]]'
+MSG_LANGNAME_EN='en'
+MSG_INDEX_DESCRIPTION_EN='Index of repositories'
+MSG_DEFAULT_TITLE_EN='Repositories'
+MSG_LOGO_ALT_INDEX_EN='Logo image of the repository list'
+MSG_LOGO_ALT_REPOSITORY_EN='Logo image of the repository'
+MSG_NAME_EN='Name'
+MSG_DESCRIPTION_EN='Description'
+MSG_LAST_COMMIT_EN='Last commit'
+MSG_FOOTER_TEMPLATE_EN='Generated with <a href="https://euandreh.xyz/@NAME@/">@NAME@</a>.'
+MSG_COMMIT_FEED_EN='commit feed'
+MSG_TAGS_FEED_EN='tags feed'
+MSG_NAV_FILES_EN='files'
+MSG_NAV_LOG_EN='log'
+MSG_NAV_REFS_EN='refs'
+MSG_THEAD_BRANCH_EN='Branch'
+MSG_THEAD_COMMITMSG_EN='Commit message'
+MSG_THEAD_AUTHOR_EN='Author'
+MSG_THEAD_DATE_EN='Date'
+MSG_THEAD_TAG_EN='Tag'
+MSG_TITLE_REFS_EN='refs'
+
+set_lang() {
+	lang="$1"
+	eval "
+	MSG_USAGE=\$MSG_USAGE_$lang
+	MSG_HELP=\$MSG_HELP_$lang
+	MSG_MISSING_CLIARG=\$MSG_MISSING_CLIARG_$lang
+	MSG_INCOMPATIBLE_OPTIONS=\$MSG_INCOMPATIBLE_OPTIONS_$lang
+	MSG_MISSING_ARGS=\$MSG_MISSING_ARGS_$lang
+	MSG_LANGNAME=\$MSG_LANGNAME_$lang
+	MSG_INDEX_DESCRIPTION=\$MSG_INDEX_DESCRIPTION_$lang
+	MSG_DEFAULT_TITLE=\$MSG_DEFAULT_TITLE_$lang
+	MSG_LOGO_ALT_INDEX=\$MSG_LOGO_ALT_INDEX_$lang
+	MSG_LOGO_ALT_REPOSITORY=\$MSG_LOGO_ALT_REPOSITORY_$lang
+	MSG_NAME=\$MSG_NAME_$lang
+	MSG_DESCRIPTION=\$MSG_DESCRIPTION_$lang
+	MSG_LAST_COMMIT=\$MSG_LAST_COMMIT_$lang
+	MSG_FOOTER_TEMPLATE=\$MSG_FOOTER_TEMPLATE_$lang
+	MSG_COMMIT_FEED=\$MSG_COMMIT_FEED_$lang
+	MSG_TAGS_FEED=\$MSG_TAGS_FEED_$lang
+	MSG_NAV_FILES=\$MSG_NAV_FILES_$lang
+	MSG_NAV_LOG=\$MSG_NAV_LOG_$lang
+	MSG_NAV_REFS=\$MSG_NAV_REFS_$lang
+	MSG_THEAD_BRANCH=\$MSG_THEAD_BRANCH_$lang
+	MSG_THEAD_COMMITMSG=\$MSG_THEAD_COMMITMSG_$lang
+	MSG_THEAD_AUTHOR=\$MSG_THEAD_AUTHOR_$lang
+	MSG_THEAD_DATE=\$MSG_THEAD_DATE_$lang
+	MSG_THEAD_TAG=\$MSG_THEAD_TAG_$lang
+	MSG_TITLE_REFS=\$MSG_TITLE_REFS_$lang
+"
+}
+
+get_lang() {
+	# LC_MESSAGES="ll_CC.CODESET@modifier" -> ll_CC, where quotes
+	# are optional
+	locale 2>/dev/null |
+		grep LC_MESSAGES |
+		cut -d.  -f1     |
+		cut -d\" -f2     |
+		cut -d=  -f2
+}
+
+case "$(get_lang)" in
+	*)
+		set_lang EN
+		;;
+esac
+
+# Utilities
+
+escape() {
+	# FIXME: HTML escape
+	echo "$1"
+}
+
+realpath() {
+	mkdir -p "$1"
+	cd "$1"
+	pwd
+}
+
+
+# Helpers
+
+usage() {
+	printf '%s\n' "$MSG_USAGE"
+}
+
+help() {
+	printf '%s\n' "$MSG_HELP"
+}
+
+version() {
+	printf '@NAME@-@VERSION@ @DATE@\n'
+}
+
+print_logo() {
+	cat <<EOF
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16">
+  <path d="M 0  8  L 1  8  L 1  9  L 0  9  L 0  8  Z" />
+  <path d="M 0  13 L 1  13 L 1  14 L 0  14 L 0  13 Z" />
+  <path d="M 1  8  L 2  8  L 2  9  L 1  9  L 1  8  Z" />
+  <path d="M 1  13 L 2  13 L 2  14 L 1  14 L 1  13 Z" />
+  <path d="M 2  8  L 3  8  L 3  9  L 2  9  L 2  8  Z" />
+  <path d="M 2  13 L 3  13 L 3  14 L 2  14 L 2  13 Z" />
+  <path d="M 3  8  L 4  8  L 4  9  L 3  9  L 3  8  Z" />
+  <path d="M 3  13 L 4  13 L 4  14 L 3  14 L 3  13 Z" />
+  <path d="M 4  7  L 5  7  L 5  8  L 4  8  L 4  7  Z" />
+  <path d="M 4  8  L 5  8  L 5  9  L 4  9  L 4  8  Z" />
+  <path d="M 4  13 L 5  13 L 5  14 L 4  14 L 4  13 Z" />
+  <path d="M 5  6  L 6  6  L 6  7  L 5  7  L 5  6  Z" />
+  <path d="M 5  7  L 6  7  L 6  8  L 5  8  L 5  7  Z" />
+  <path d="M 5  13 L 6  13 L 6  14 L 5  14 L 5  13 Z" />
+  <path d="M 6  5  L 7  5  L 7  6  L 6  6  L 6  5  Z" />
+  <path d="M 6  6  L 7  6  L 7  7  L 6  7  L 6  6  Z" />
+  <path d="M 6  14 L 7  14 L 7  15 L 6  15 L 6  14 Z" />
+  <path d="M 7  1  L 8  1  L 8  2  L 7  2  L 7  1  Z" />
+  <path d="M 7  14 L 8  14 L 8  15 L 7  15 L 7  14 Z" />
+  <path d="M 7  15 L 8  15 L 8  16 L 7  16 L 7  15 Z" />
+  <path d="M 7  2  L 8  2  L 8  3  L 7  3  L 7  2  Z" />
+  <path d="M 7  3  L 8  3  L 8  4  L 7  4  L 7  3  Z" />
+  <path d="M 7  4  L 8  4  L 8  5  L 7  5  L 7  4  Z" />
+  <path d="M 7  5  L 8  5  L 8  6  L 7  6  L 7  5  Z" />
+  <path d="M 8  1  L 9  1  L 9  2  L 8  2  L 8  1  Z" />
+  <path d="M 8  15 L 9  15 L 9  16 L 8  16 L 8  15 Z" />
+  <path d="M 9  1  L 10 1  L 10 2  L 9  2  L 9  1  Z" />
+  <path d="M 9  2  L 10 2  L 10 3  L 9  3  L 9  2  Z" />
+  <path d="M 9  6  L 10 6  L 10 7  L 9  7  L 9  6  Z" />
+  <path d="M 9  15 L 10 15 L 10 16 L 9  16 L 9  15 Z" />
+  <path d="M 10 2  L 11 2  L 11 3  L 10 3  L 10 2  Z" />
+  <path d="M 10 3  L 11 3  L 11 4  L 10 4  L 10 3  Z" />
+  <path d="M 10 4  L 11 4  L 11 5  L 10 5  L 10 4  Z" />
+  <path d="M 10 5  L 11 5  L 11 6  L 10 6  L 10 5  Z" />
+  <path d="M 10 6  L 11 6  L 11 7  L 10 7  L 10 6  Z" />
+  <path d="M 11 6  L 12 6  L 12 7  L 11 7  L 11 6  Z" />
+  <path d="M 11 8  L 12 8  L 12 9  L 11 9  L 11 8  Z" />
+  <path d="M 10 15 L 11 15 L 11 16 L 10 16 L 10 15 Z" />
+  <path d="M 11 10 L 12 10 L 12 11 L 11 11 L 11 10 Z" />
+  <path d="M 11 12 L 12 12 L 12 13 L 11 13 L 11 12 Z" />
+  <path d="M 11 14 L 12 14 L 12 15 L 11 15 L 11 14 Z" />
+  <path d="M 11 15 L 12 15 L 12 16 L 11 16 L 11 15 Z" />
+  <path d="M 12 6  L 13 6  L 13 7  L 12 7  L 12 6  Z" />
+  <path d="M 12 8  L 13 8  L 13 9  L 12 9  L 12 8  Z" />
+  <path d="M 12 10 L 13 10 L 13 11 L 12 11 L 12 10 Z" />
+  <path d="M 12 12 L 13 12 L 13 13 L 12 13 L 12 12 Z" />
+  <path d="M 12 14 L 13 14 L 13 15 L 12 15 L 12 14 Z" />
+  <path d="M 13 6  L 14 6  L 14 7  L 13 7  L 13 6  Z" />
+  <path d="M 13 8  L 14 8  L 14 9  L 13 9  L 13 8  Z" />
+  <path d="M 13 10 L 14 10 L 14 11 L 13 11 L 13 10 Z" />
+  <path d="M 13 12 L 14 12 L 14 13 L 13 13 L 13 12 Z" />
+  <path d="M 13 13 L 14 13 L 14 14 L 13 14 L 13 13 Z" />
+  <path d="M 13 14 L 14 14 L 14 15 L 13 15 L 13 14 Z" />
+  <path d="M 14 7  L 15 7  L 15 8  L 14 8  L 14 7  Z" />
+  <path d="M 14 8  L 15 8  L 15 9  L 14 9  L 14 8  Z" />
+  <path d="M 14 9  L 15 9  L 15 10 L 14 10 L 14 9  Z" />
+  <path d="M 14 10 L 15 10 L 15 11 L 14 11 L 14 10 Z" />
+  <path d="M 14 11 L 15 11 L 15 12 L 14 12 L 14 11 Z" />
+  <path d="M 14 12 L 15 12 L 15 13 L 14 13 L 14 12 Z" />
+</svg>
+EOF
+}
+
+print_style() {
+	cat <<EOF
+:root {
+  --color: black;
+  --background-color: white;
+  --hover-color: hsl(0, 0%, 93%);
+  --nav-color: hsl(0, 0%, 87%);
+}
+
+@media(prefers-color-scheme: dark) {
+  :root {
+    --color: white;
+    --background-color: black;
+    --hover-color: hsl(0, 0%, 7%);
+    --nav-color: hsl(0, 0%, 13%);
+  }
+
+  body {
+    color: var(--color);
+    background-color: var(--background-color);
+  }
+
+  a {
+    color: hsl(211, 100%, 60%);
+  }
+
+  a:visited {
+    color: hsl(242, 100%, 80%);
+  }
+}
+
+body {
+  font-family: monospace;
+  max-width: 1100px;
+  margin: 0 auto 0 auto;
+}
+
+.logo {
+  height: 6em;
+  width: 6em;
+}
+
+.header-horizontal-grouping {
+  display: flex;
+  align-items: center;
+  margin-top: 1em;
+  margin-bottom: 1em;
+}
+
+.header-description {
+  margin-left: 2em;
+}
+
+nav {
+  margin-top: 2em;
+}
+
+nav ul {
+  display: flex;
+  list-style-type: none;
+  margin-bottom: 0;
+}
+
+nav li {
+  margin-left: 10px;
+}
+
+nav a, nav a:visited {
+  padding: 2px 8px 0px 8px;
+  color: var(--color);
+}
+
+.selected-nav-item {
+  background-color: var(--nav-color);
+}
+
+hr {
+  margin-top: 0;
+  border: 0;
+  border-top: 3px solid var(--nav-color);
+}
+
+table {
+  margin: 2em auto;
+}
+
+th {
+  padding-bottom: 1em;
+}
+
+tbody tr:hover {
+  background-color: var(--hover-color);
+}
+
+td {
+  padding-left: 1em;
+  padding-right: 1em;
+}
+
+footer {
+  text-align: center;
+}
+EOF
+}
+
+print_index_header() {
+	cat <<EOF
+<!DOCTYPE html>
+<html lang="$(escape "$MSG_LANGNAME")">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport"    content="width=device-width, initial-scale=1" />
+    <meta name="description" content="$(escape "$MSG_INDEX_DESCRIPTION")" />
+    <link rel="icon"       type="image/svg+xml" href="logo.svg" />
+    <link rel="stylesheet" type="text/css"      href="style.css" />
+    <title>$(escape "$TITLE")"</title>
+  </head>
+  <body>
+    <header>
+      <div class="header-horizontal-grouping">
+	<img alt="$(escape "$MSG_LOGO_ALT_INDEX")" src="logo.svg" />
+	<h1 class="header-description">
+	  $(escape "$TITLE")
+	</h1>
+      </div>
+      <hr />
+    </header>
+    <main>
+      <table>
+	<thead>
+	  <tr>
+	    <th>
+	      $(escape "$MSG_NAME")
+	    </th>
+	    <th>
+	      $(escape "$MSG_DESCRIPTION")
+	    </th>
+	    <th>
+	      $(escape "$MSG_LAST_COMMIT")
+	    </th>
+	  </tr>
+	</thead>
+	<tbody>
+EOF
+}
+
+print_index_row() {
+	repo="$(basename "$(realpath "${1%.git}")")"
+	description="$(cat "$1/description" 2>/dev/null ||:)"
+	last_commit_date="$(git -C "$1" log -1 --format=%cd --date='format:%Y-%m:%d %H:%M' 2>/dev/null ||:)"
+	cat <<EOF
+	  <tr>
+	    <td>
+	      <a href="$(escape "$repo")">
+		$(escape "$repo")
+	      </a>
+	    </td>
+	    <td>
+	      $(escape "$description")
+	    </td>
+	    <td>
+	      $(escape "$last_commit_date")
+	    </td>
+	  </tr>
+EOF
+}
+
+print_index_footer() {
+	cat <<EOF
+	</tbody>
+      </table>
+    </main>
+    <footer>
+      <hr />
+      <p>
+	$(escape "$MSG_FOOTER_TEMPLATE")
+      </p>
+    </footer>
+  </body>
+</html>
+EOF
+}
+
+index_write() {
+	rm -f "$OUTDIR/index.html"
+	print_index_header >> "$OUTDIR/index.html"
+	for r in "$@"; do
+		print_index_row "$r" >> "$OUTDIR/index.html"
+	done
+	print_index_footer >> "$OUTDIR/index.html"
+
+	print_logo > "$OUTDIR/logo.svg"
+	print_style > "$OUTDIR/style.css"
+}
+
+print_repo_refs() {
+	repo="$1"
+	description="$2"
+	show_signature="$3"
+	cat <<EOF
+<!DOCTYPE html>
+<html lang="$(escape "$MSG_LANGNAME")">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport"    content="width=device-width, initial-scale=1" />
+    <meta name="description" content="$(escape "$description")" />
+    <link rel="icon"       type="image/svg+xml"        href="logo.svg" />
+    <link rel="stylesheet" type="text/css"             href="style.css" />
+    <link rel="alternate"  type="application/atom+xml" href="commits.xml" title="$(escape "$repo") - $(escape "$MSG_COMMIT_FEED")" hreflang="$(escape "$MSG_LANGNAME")" />
+    <link rel="alternate"  type="application/atom+xml" href="tags.xml"    title="$(escape "$repo") - $(escape "$MSG_TAGS_FEED")"   hreflang="$(escape "$MSG_LANGNAME")" />
+    <title>$(escape "$repo") - $(escape "$MSG_TITLE_REFS")</title>
+  </head>
+  <body>
+    <header>
+      <div class="header-horizontal-grouping">
+	<a href="../">
+	  <img alt="$(escape "$MSG_LOGO_ALT_REPOSITORY")" class="logo" src="logo.svg" />
+	</a>
+	<div class="header-description">
+	  <h1>
+	    <a href="./">
+	      $(escape "$repo")
+	    </a>
+	  </h1>
+	  <h2>
+	    $(escape "$description") </h2> <code> git clone $(escape "$CLONE_URL") </code> </div>
+      </div>
+      <nav>
+	<ul>
+	  <li>
+	    <a href="files.html">
+	      $(escape "$MSG_NAV_FILES")
+	    </a>
+	  </li>
+	  <li>
+	    <a href="log.html">
+	      $(escape "$MSG_NAV_LOG")
+	    </a>
+	  </li>
+	  <li class="selected-nav-item">
+	    <a href="refs.html">
+	      $(escape "$MSG_NAV_REFS")
+	    </a>
+	  </li>
+	</ul>
+      </nav>
+      <hr />
+    </header>
+    <main>
+      <table>
+	<thead>
+	  <tr>
+	    <th>
+	      $(escape "$MSG_THEAD_BRANCH")
+	    </th>
+	    <th>
+	      $(escape "$MSG_THEAD_COMMITMSG")
+	    </th>
+	    <th>
+	      $(escape "$MSG_THEAD_AUTHOR")
+	    </th>
+	    <th>
+	      $(escape "$MSG_THEAD_DATE")
+	    </th>
+	  </tr>
+	</thead>
+	<tbody>
+EOF
+
+	for branch in $(git branch --format '%(refname:lstrip=2)'); do
+		sha="$(git rev-parse "$branch")"
+		cat <<EOF
+          <tr>
+	    <td>
+	      <a href="log/$(escape "$branch").html">
+		$(escape "$branch")
+	      </a>
+	    </td>
+	    <td>
+	      <a href="commit/$(escape "$sha").html">
+		$(escape "$(git log -1 --format=%B "$sha")")
+	      </a>
+	    </td>
+	    <td>
+	      $(escape "$(git log -1 --format=%an "$sha")")
+	    </td>
+	    <td>
+	      $(escape "$(git log -1 --format=%cd --date='format:%Y-%m:%d %H:%M' "$sha")")
+	    </td>
+	  </tr>
+EOF
+	done
+
+	cat <<EOF
+        </tbody>
+      </table>
+      <table>
+	<thead>
+	  <tr>
+	    <th>
+	      $(escape "$MSG_THEAD_TAG")
+	    </th>
+	    <th>
+	      $(escape "$MSG_THEAD_AUTHOR")
+	    </th>
+	    <th>
+	      $(escape "$MSG_THEAD_DATE")
+	    </th>
+	  </tr>
+	</thead>
+	<tbody>
+EOF
+
+	for tag in $(git tag); do
+		if [ "$show_signature" = true ]; then
+			tarball_link="(<a href=\"tarballs/$(escape "$repo")-$(escape "$tag").tar.gz\">tarball</a>,
+	       <a href=\"tarballs/$(escape "$repo")-$(escape "$tag").tar.gz.asc\">sig</a>)"
+		else
+			tarball_link="(<a href=\"tarballs/$(escape "$repo")-$(escape "$tag").tar.gz\">tarball</a>)"
+		fi
+		cat <<EOF
+          <tr>
+	    <td>
+	      <a href="tag/$(escape "$tag").html">
+                $(escape "$tag")
+	      </a>
+	      $tarball_link
+	    </td>
+	    <td>
+	      $(escape "$(git log -1 --format=%an "$tag")")
+	    </td>
+	    <td>
+	      $(escape "$(git log -1 --format=%cd --date='format:%Y-%m:%d %H:%M' "$tag")")
+	    </td>
+	  </tr>
+EOF
+	done
+
+	cat <<EOF
+        </tbody>
+      </table>
+    </main>
+    <footer>
+      <hr />
+      <p>
+	$(escape "$MSG_FOOTER_TEMPLATE")
+      </p>
+    </footer>
+  </body>
+</html>
+EOF
+}
+
+print_repo_commit_page() {
+	cat <<EOF
+<!DOCTYPE html>
+<html lang="$(escape "$MSG_LANGNAME")">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport"    content="width=device-width, initial-scale=1" />
+    <meta name="description" content="$(escape "$description")" />
+    <link rel="icon"       type="image/svg+xml"        href="../logo.svg" />
+    <link rel="stylesheet" type="text/css"             href="../style.css" />
+    <link rel="alternate"  type="application/atom+xml" href="../commits.xml" title="$(escape "$repo") - $(escape "$MSG_COMMIT_FEED")" hreflang="$(escape "$MSG_LANGNAME")" />
+    <link rel="alternate"  type="application/atom+xml" href="../tags.xml"    title="$(escape "$repo") - $(escape "$MSG_TAGS_FEED")"   hreflang="$(escape "$MSG_LANGNAME")" />
+    <title>$(escape "$repo") - FIXME put content here</title>
+  </head>
+  <body>
+    <header>
+      <div class="header-horizontal-grouping">
+	<a href="../../">
+	  <img alt="$(escape "$MSG_LOGO_ALT_REPOSITORY")" class="logo" src="../logo.svg" />
+	</a>
+	<div class="header-description">
+	  <h1>
+	    <a href="../">
+	      $(escape "$repo")
+	    </a>
+	  </h1>
+	  <h2>
+	    $(escape "$description")
+	  </h2>
+	  <code>
+	    git clone $(escape "$CLONE_URL")
+	  </code>
+	</div>
+      </div>
+      <nav>
+	<ul>
+	  <li>
+	    <a href="files.html">
+	      $(escape "$MSG_NAV_FILES")
+	    </a>
+	  </li>
+	  <li>
+	    <a href="log.html">
+	      $(escape "$MSG_NAV_LOG")
+	    </a>
+	  </li>
+	  <li>
+	    <a href="refs.html">
+	      $(escape "$MSG_NAV_REFS")
+	    </a>
+	  </li>
+	</ul>
+      </nav>
+      <hr />
+    </header>
+    <main>
+      CODE HR
+    </main>
+    <footer>
+      <hr />
+      <p>
+	$(escape "$MSG_FOOTER_TEMPLATE")
+      </p>
+    </footer>
+  </body>
+</html>
+EOF
+}
+
+repo_tarballs_write() {
+	repo="$1"
+	mkdir -p "$OUTDIR/tarballs" "$CACHE_DIR/tarballs"
+	for branch in $(git branch --format '%(refname:lstrip=2)'); do
+		git archive  --prefix "$repo-$branch/" "$branch" \
+			-o "$OUTDIR/tarballs/$repo-$branch.tar.xz"
+	done
+
+	for tag in $(git tag); do
+		TARBALL_PATH="tarballs/$repo-$tag.tar.gz"
+		if [ -e "$OUTDIR/$TARBALL_PATH" ]; then
+			continue
+		fi
+		if [ ! -e "$CACHE_DIR/$TARBALL_PATH" ]; then
+			git archive  --prefix "$repo-$tag/" "$tag" \
+				-o "$CACHE_DIR/$TARBALL_PATH"
+		fi
+		cp "$CACHE_DIR/$TARBALL_PATH" "$OUTDIR/$TARBALL_PATH"
+	done
+
+	# FIXME: write signatures
+}
+
+repo_commits_write() {
+	mkdir -p "$OUTDIR/commit" "$CACHE_DIR/commit"
+	for branch in $(git branch --format '%(refname:lstrip=2)'); do
+		for commit in $(git rev-list "$branch"); do
+			COMMIT_PATH="commit/$commit.html"
+			if [ -e "$OUTDIR/$COMMIT_PATH" ]; then
+				# Assume all previous history exists, too
+				break
+			fi
+			if [ ! -e "CACHE_DIR/$COMMIT_PATH" ]; then
+				print_repo_commit_page "$repo" "$commit"
+				print_repo_commit_page "$repo" "$commit" \
+					> "$CACHE_DIR/$COMMIT_PATH"
+			fi
+			cp "$CACHE_DIR/$COMMIT_PATH" "$OUTDIR/$COMMIT_PATH"
+
+			# FIXME: dbg
+			return
+		done
+	done
+}
+
+repo_write() {
+	cd "$1"
+	repo="$(basename "$(realpath "${1%.git}")")"
+	description="$(cat "$1/description" 2>/dev/null ||:)"
+
+	# FIXME: hardcoded "true"
+	repo_tarballs_write "$repo"
+	print_repo_refs "$repo" "$description" true > "$OUTDIR/refs.html"
+
+	repo_commits_write "$repo"
+
+	print_logo > "$OUTDIR/logo.svg"
+	print_style > "$OUTDIR/style.css"
+	cd - > /dev/null
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		--version)
+			version
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+INDEX=false
+TITLE="$MSG_DEFAULT_TITLE"
+OUTDIR=
+CLONE_URL=
+CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/gistatic"
+while getopts 'o:t:u:ihV' flag; do
+	case "$flag" in
+		i)
+			INDEX=true
+			;;
+		t)
+			TITLE="$OPTARG"
+			;;
+		o)
+			OUTDIR="$(realpath "$OPTARG")"
+			;;
+		u)
+			CLONE_URL="$OPTARG"
+			;;
+		h)
+			usage
+			help
+			exit
+			;;
+		V)
+			version
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+assert_arg() {
+	if [ -z "$1" ]; then
+		printf "$MSG_MISSING_CLIARG" "$2" >&2
+		exit 2
+	fi
+}
+
+assert_arg "$OUTDIR" '-o DIRECTORY'
+
+if [ "$INDEX" = false ]; then
+	assert_arg "$CLONE_URL" '-u CLONE_URL'
+elif [ -n "$CLONE_URL" ]; then
+	printf '%s\n' "$MSG_INCOMPATIBLE_OPTIONS" >&2
+	exit 2
+fi
+
+if [ -z "${1:-}" ]; then
+	printf '%s\n' "$MSG_MISSING_ARGS" >&2
+	exit 2
+fi
+
+mkdir -p "$OUTDIR"
+
+if [ "$INDEX" = true ]; then
+	index_write "$@"
+else
+	repo_write "$1"
+fi