Add oh-parsechangelog.

4 files changed, 203 insertions, 2 deletions

diff --git a/lib/Makefile.in b/lib/Makefile.in
index 4e9ecdf..ecf1e3a 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -28,7 +28,7 @@ LIBDIR = @libdir@
 .SUFFIXES:
 .SUFFIXES: .sh
 
-SRCS = controlfields.sh architecture.sh archive.sh messages.sh
+SRCS = controlfields.sh architecture.sh archive.sh messages.sh changelog.sh
 OBJS = $(SRCS:.sh=)
 
 PACKAGE = @package@
diff --git a/lib/changelog.sh b/lib/changelog.sh
new file mode 100644
index 0000000..81e3332
--- /dev/null
+++ b/lib/changelog.sh
@@ -0,0 +1,145 @@
+#!@@SHELL@@
+#
+# opkhelper
+# lib/changelog
+# Functions for parsing changelogs.
+#
+# Copyright (C) 2012 Patrick "P. J." McDermott
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. @@LIBDIR@@/opkhelper/messages
+
+oh_changelog_parse_error()
+{
+	_file="${1}"
+	_line_nr="${2}"
+	_error="${3}"
+	_expect_id="${4}"
+
+	case "${_expect_id}" in
+		FIRST_HEADING)      _expect_str='first heading';;
+		NEXT_OR_EOF)        _expect_str='next heading or eof';;
+		START_CHANGES)      _expect_str='start of change data';;
+		CHANGES_OR_TRAILER) _expect_str='more change data or trailer';;
+		*)                  _expect_str='unknown';;
+	esac
+
+	_file_info=$(printf '%20s(l%d):' "${_file}" "${_line_nr}")
+	oh_warn "${_file_info} ${_error}" "${_expect_str}"
+}
+
+oh_changelog_parse()
+{
+	# Parsing logic based on that of dpkg.
+
+	_file="${1}"
+	_cb="${2}"
+
+	_expect=FIRST_HEADING
+	_line_nr=0
+	_entries=0
+
+	while IFS= read _line; do
+		_line_nr=$(($_line_nr + 1))
+		if [ -z "${_line}" ]; then
+			if [ "${_expect}" = START_CHANGES ]; then
+				OH_CHANGELOG_CHANGES="${OH_CHANGELOG_CHANGES}
+${_line}"
+			elif [ "${_expect}" = NEXT_OR_EOF ]; then
+				:
+			elif [ "${_expect}" != CHANGES_OR_TRAILER ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'found blank line where expected %s' "${_expect}"
+			else
+				_blank_lines="${_blank_lines}
+${_line}"
+			fi
+		elif [ "${_line# }" = "${_line}" ]; then
+			if [ "${_expect}" != FIRST_HEADING -a \
+					"${_expect}" != NEXT_OR_EOF ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'found start of entry where expected %s' "${_expect}"
+			fi
+			_source="${_line%% (*}"
+			_line_="${_line#* (}"
+			_distribution="${_line_##*) }"
+			_line_="${_line_%) *}"
+			_version="${_line_}"
+			if [ -z "${_source}" -o -z "${_distribution}" -o \
+					-z "${_version}" -o \
+					"${_version% *}" != "${_version}" ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'badly formatted heading line'
+				OH_CHANGELOG_SOURCE=
+				OH_CHANGELOG_VERSION=
+				OH_CHANGELOG_DISTRIBUTION=
+				OH_CHANGELOG_CHANGES=
+			else
+				OH_CHANGELOG_SOURCE="${_source}"
+				OH_CHANGELOG_VERSION="${_version}"
+				OH_CHANGELOG_DISTRIBUTION="${_distribution}"
+				OH_CHANGELOG_CHANGES="${_line}"
+			fi
+			_expect=START_CHANGES
+			_blank_lines=
+		elif [ "${_line# -- }" != "${_line}" ]; then
+			if [ "${_expect}" != CHANGES_OR_TRAILER ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'found trailer where expected %s' "${_expect}"
+			fi
+			_line="${_line# -- }"
+			_maintainer="${_line%%  *}"
+			_date="${_line#*  }"
+			if [ -z "${_maintainer}" -o -z "${_date}" -o \
+					"${_maintainer}" = "${_date}" ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'badly formatted trailer line'
+				OH_CHANGELOG_MAINTAINER=
+				OH_CHANGELOG_DATE=
+			elif [ -n "${OH_CHANGELOG_SOURCE}" ]; then
+				OH_CHANGELOG_MAINTAINER="${_maintainer}"
+				OH_CHANGELOG_DATE="${_date}"
+				"${_cb}"
+				_entries=$(($_entries + 1))
+			fi
+			_expect=NEXT_OR_EOF
+			_blank_lines=
+		elif [ "${_line# --}" != "${_line}" ]; then
+			oh_changelog_parse_error "${_file}" "${_line_nr}" \
+				'badly formatted trailer line'
+		elif [ "${_line##  }" != "${_line}" ]; then
+			if [ "${_expect}" != START_CHANGES -a \
+					"${_expect}" != CHANGES_OR_TRAILER ]; then
+				oh_changelog_parse_error "${_file}" "${_line_nr}" \
+					'found change data where expected %s' "${_expect}"
+			fi
+			OH_CHANGELOG_CHANGES="${OH_CHANGELOG_CHANGES}
+${_blank_lines}${_line}"
+			_expect=CHANGES_OR_TRAILER
+			_blank_lines=
+		else
+			oh_changelog_parse_error "${_file}" "${_line_nr}" \
+				'unrecognized line'
+			_blank_lines=
+		fi
+	done <"${_file}"
+
+	if [ "${_expect}" != NEXT_OR_EOF ]; then
+		oh_changelog_parse_error "${_file}" "${_line_nr}" \
+			'found eof where expected %s' "${_expect}"
+	fi
+
+	return ${_entries}
+}
diff --git a/src/Makefile.in b/src/Makefile.in
index 1037f98..bc4a362 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -31,7 +31,7 @@ BINDIR = @bindir@
 SRCS = opkbuild.sh \
        oh-checkbuilddeps.sh oh-applypatches.sh oh-copyconfig.sh \
        oh-strip.sh oh-installfiles.sh oh-installdocs.sh \
-       oh-gencontrol.sh oh-buildopk.sh
+       oh-gencontrol.sh oh-buildopk.sh oh-parsechangelog.sh
 OBJS = $(SRCS:.sh=)
 
 PACKAGE = @package@
diff --git a/src/oh-parsechangelog.sh b/src/oh-parsechangelog.sh
new file mode 100644
index 0000000..86d8a8a
--- /dev/null
+++ b/src/oh-parsechangelog.sh
@@ -0,0 +1,56 @@
+#!@@SHELL@@
+#
+# opkhelper
+# src/oh-parsechangelog
+# Parse a changelog.
+#
+# Copyright (C) 2012 Patrick "P. J." McDermott
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. @@LIBDIR@@/opkhelper/changelog
+
+print_usage()
+{
+	printf 'Usage: %s\n' "${1}"
+}
+
+main()
+{
+	oh_changelog_parse changelog output
+
+	printf 'Parsed %d entries.\n' ${?}
+}
+
+output()
+{
+	printf 'Source: %s\nVersion: %s\nDistribution: %s\n' \
+		"${OH_CHANGELOG_SOURCE}" "${OH_CHANGELOG_VERSION}" \
+		"${OH_CHANGELOG_DISTRIBUTION}"
+	printf 'Maintainer: %s\nDate: %s\n' \
+		"${OH_CHANGELOG_MAINTAINER}" "${OH_CHANGELOG_DATE}"
+	printf 'Changes:\n'
+	while IFS= read -r line; do
+		if [ -z "${line}" ]; then
+			printf ' .\n'
+		else
+			printf ' %s\n' "${line}"
+		fi
+	done <<EOF
+${OH_CHANGELOG_CHANGES}
+EOF
+	echo
+}
+
+main