Add a basic manpage

Commonly required for packaging.

Closes: #19
Approved by: cgwalters

Makefile.am

@@ -35,6 +35,7 @@ typelibdir = $(pkglibdir)/girepository-1.0
 typelib_DATA = $(gir_DATA:.gir=.typelib)
 
 include src/Makefile-git-evtag.am
+include man/Makefile-man.am
 include rust/Makefile-inc.am
 include tests/Makefile-tests.am
 

configure.ac

@@ -36,6 +36,23 @@ LIBS=$BUILDDEP_LIBGIT_GLIB_LIBS
 AC_CHECK_FUNCS(git_libgit2_init)
 LIBS=$save_LIBS
 
+AC_ARG_ENABLE(man,
+              [AS_HELP_STRING([--enable-man],
+                              [generate man pages [default=auto]])],,
+              enable_man=maybe)
+
+AS_IF([test "$enable_man" != no], [
+  AC_PATH_PROG([XSLTPROC], [xsltproc])
+  AS_IF([test -z "$XSLTPROC"], [
+    AS_IF([test "$enable_man" = yes], [
+      AC_MSG_ERROR([xsltproc is required for --enable-man])
+    ])
+    enable_man=no
+  ])
+  enable_man=yes
+])
+AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
+
 AC_ARG_ENABLE(rust,
               [AS_HELP_STRING([--enable-rust],
                               [Compile Rust version [default=no]])],,
@@ -66,6 +83,7 @@ AC_OUTPUT
 echo "
     $PACKAGE $VERSION
 
+    man pages (xsltproc):                    $enable_man
     installed tests:                         $enable_installed_tests
     Rust implementation:                     $enable_rust
 "

man/Makefile-man.am

@@ -0,0 +1,47 @@
+# Makefile for man/
+#
+# Copyright (C) 2016 Colin Walters <walters@verbum.org>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+if ENABLE_MAN
+
+man1_files = git-evtag.1
+
+man1_MANS = $(addprefix man/,$(man1_files))
+
+EXTRA_DIST += $(man1_MANS) $(man5_MANS)
+
+XSLT_STYLESHEET = http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
+
+XSLTPROC_FLAGS = \
+        --nonet \
+        --stringparam man.output.quietly 1 \
+        --stringparam funcsynopsis.style ansi \
+        --stringparam man.th.extra1.suppress 1 \
+        --stringparam man.authors.section.enabled 0 \
+        --stringparam man.copyright.section.enabled 0
+
+XSLTPROC_MAN = $(XSLTPROC) $(XSLTPROC_FLAGS)
+
+%.1: %.xml
+	$(AM_V_GEN) $(XSLTPROC_MAN) --output $@ $(XSLT_STYLESHEET) $<
+
+CLEANFILES += \
+	$(man1_MANS) \
+	$(NULL)
+
+endif

man/git-evtag.xml

@@ -0,0 +1,77 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+    "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+Copyright 2016 Colin Walters <walters@verbum.org>
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the
+Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.
+-->
+
+<refentry id="git-evtag">
+
+    <refentryinfo>
+        <title>git-evtag</title>
+        <productname>git-evtag</productname>
+
+        <authorgroup>
+            <author>
+                <contrib>Developer</contrib>
+                <firstname>Colin</firstname>
+                <surname>Walters</surname>
+                <email>walters@verbum.org</email>
+            </author>
+        </authorgroup>
+    </refentryinfo>
+
+    <refmeta>
+        <refentrytitle>git-evtag</refentrytitle>
+        <manvolnum>1</manvolnum>
+    </refmeta>
+
+    <refnamediv>
+        <refname>git-evtag</refname>
+        <refpurpose>Sign a git commit with extended checksums</refpurpose>
+    </refnamediv>
+
+    <refsynopsisdiv>
+        <cmdsynopsis>
+            <command>git evtag sign</command> <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">TAGNAME</arg>
+        </cmdsynopsis>
+        <cmdsynopsis>
+            <command>git evtag verify</command> <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">TAGNAME</arg>
+        </cmdsynopsis>
+    </refsynopsisdiv>
+
+    <refsect1>
+        <title>Description</title>
+
+        <para>
+	  While git can use GPG to sign tags and commits, it only
+	  covers a commit object, which is subject to SHA1 weaknesses.
+	  This tool uses SHA512 across the entire content of a tag,
+	  creating a stronger level of assurance.
+        </para>
+    </refsect1>
+
+    <refsect1>
+        <title>Options</title>
+
+	<para>
+	  See the subcommand help, e.g. <command>git-evtag sign --help</command>.
+	</para>
+    </refsect1>
+</refentry>