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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_generate_changelog.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_GENERATE_CHANGELOG()
#
# DESCRIPTION
#
# Builds a rule for generating a ChangeLog file from version control
# system commit messages. Currently, the only supported VCS is git, but
# support for others could be added in future.
#
# Defines GENERATE_CHANGELOG_RULES which should be substituted in your
# Makefile.
#
# Usage example:
#
# configure.ac:
#
# AX_GENERATE_CHANGELOG
#
# Makefile.am:
#
# @GENERATE_CHANGELOG_RULES@
# CHANGELOG_START = 0.2.3^
# dist-hook: dist-ChangeLog
#
# ChangeLog (stub committed to VCS):
#
# The ChangeLog is auto-generated when releasing.
# If you are seeing this, use 'git log' for a detailed list of changes.
#
# This results in a "dist-ChangeLog" rule being added to the Makefile.
# When run, "dist-ChangeLog" will generate a ChangeLog in the
# $(top_distdir), using $(CHANGELOG_GIT_FLAGS) to format the output from
# "git log" being run in $(CHANGELOG_GIT_DIR).
#
# Unless Automake is initialised with the 'foreign' option, a dummy
# ChangeLog file must be committed to VCS in $(top_srcdir), containing the
# text above (for example). It will be substituted by the automatically
# generated ChangeLog during "make dist".
#
# LICENSE
#
# Copyright (c) 2015 David King <amigadave@amigadave.com>
# Copyright (c) 2015 Philip Withnall <philip.withnall@collabora.co.uk>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 2
AC_DEFUN([AX_GENERATE_CHANGELOG],[
# Find git, defaulting to the 'missing' script so the user gets a nice
# message if git is missing, rather than a plain 'command not found'.
AC_PATH_PROG([GIT],[git],[${am_missing_run}git])
AC_SUBST([GIT])
# Build the ChangeLog rules.
m4_pattern_allow([AM_V_GEN])
GENERATE_CHANGELOG_RULES='
# Generate ChangeLog
#
# Optional:
# - CHANGELOG_START: git commit ID or tag name to output changelogs from
# (exclusive). (Default: include all commits)
# - CHANGELOG_GIT_FLAGS: General flags to pass to git-log when generating the
# ChangeLog. (Default: various)
# - CHANGELOG_GIT_DIR: .git directory to use. (Default: $(top_srcdir)/.git)
# git-specific
CHANGELOG_GIT_FLAGS ?= --stat -M -C --name-status --no-color --no-decorate
CHANGELOG_GIT_DIR ?= $(top_srcdir)/.git
ifeq ($(CHANGELOG_START),)
CHANGELOG_GIT_RANGE =
else
CHANGELOG_GIT_RANGE = $(CHANGELOG_START)..
endif
# Generate a ChangeLog in $(top_distdir)
dist-ChangeLog:
$(AM_V_GEN)if $(GIT) \
--git-dir=$(CHANGELOG_GIT_DIR) --work-tree=$(top_srcdir) log \
$(CHANGELOG_GIT_FLAGS) $(CHANGELOG_GIT_RANGE) \
| fmt --split-only >.ChangeLog.tmp; \
then mv -f .ChangeLog.tmp "$(top_distdir)/ChangeLog"; \
else rm -f .ChangeLog.tmp; exit 1; fi
.PHONY: dist-ChangeLog
'
AC_SUBST([GENERATE_CHANGELOG_RULES])
m4_ifdef([_AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE([GENERATE_CHANGELOG_RULES])])
])
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