pkgctl: introduce the version subcommand

Related to https://gitlab.archlinux.org/archlinux/devtools/-/issues/125

Closes #125

Signed-off-by: Christian Heusel <christian@heusel.eu>
Co-Authored-By: Levente Polyak <anthraxx@archlinux.org>

5 files changed, 98 insertions, 0 deletions

diff --git a/contrib/completion/zsh/_devtools.in b/contrib/completion/zsh/_devtools.in
index cc8d5cf..20c37ce 100644
--- a/contrib/completion/zsh/_devtools.in
+++ b/contrib/completion/zsh/_devtools.in
@@ -231,9 +231,15 @@ _pkgctl_cmds=(
 	"diff[Compare package files using different modes]"
 	"release[Release step to commit, tag and upload build artifacts]"
 	"repo[Manage Git packaging repositories and their configuration]"
+	"version[Show pkgctl version information]"
 )
 
 _pkgctl_args=(
+	'(-V --version)'{-V,--version}'[Show pkgctl version information]'
+	'(-h --help)'{-h,--help}'[Display usage]'
+)
+
+_pkgctl_version_args=(
 	'(-h --help)'{-h,--help}'[Display usage]'
 )
 
diff --git a/doc/man/pkgctl-version.1.asciidoc b/doc/man/pkgctl-version.1.asciidoc
new file mode 100644
index 0000000..9beebf5
--- /dev/null
+++ b/doc/man/pkgctl-version.1.asciidoc
@@ -0,0 +1,23 @@
+pkgctl-version(1)
+=================
+
+Name
+----
+pkgctl-version - Show pkgctl version information
+
+Synopsis
+--------
+pkgctl version [OPTIONS]
+
+Description
+-----------
+
+Shows the current version information of pkgctl.
+
+Options
+-------
+
+*-h, --help*::
+	Show a help text
+
+include::include/footer.asciidoc[]
diff --git a/doc/man/pkgctl.1.asciidoc b/doc/man/pkgctl.1.asciidoc
index c5a6174..72cda1e 100644
--- a/doc/man/pkgctl.1.asciidoc
+++ b/doc/man/pkgctl.1.asciidoc
@@ -14,6 +14,15 @@ Description
 
 TODO
 
+Options
+-------
+
+*-V, --version*::
+	Show pkgctl version information
+
+*-h, --help*::
+	Show a help text
+
 Subcommands
 -----------
 
@@ -35,6 +44,9 @@ pkgctl release::
 pkgctl repo::
 	Manage Git packaging repositories and their configuration
 
+pkgctl version::
+	Show pkgctl version information
+
 See Also
 --------
 
@@ -44,5 +56,6 @@ linkman:pkgctl-db[1]
 linkman:pkgctl-diff[1]
 linkman:pkgctl-release[1]
 linkman:pkgctl-repo[1]
+linkman:pkgctl-version[1]
 
 include::include/footer.asciidoc[]
diff --git a/src/lib/version/version.sh b/src/lib/version/version.sh
new file mode 100644
index 0000000..d00a460
--- /dev/null
+++ b/src/lib/version/version.sh
@@ -0,0 +1,47 @@
+#!/hint/bash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+[[ -z ${DEVTOOLS_INCLUDE_VERSION_SH:-} ]] || return 0
+DEVTOOLS_INCLUDE_VERSION_SH=1
+
+_DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
+
+source /usr/share/makepkg/util/message.sh
+
+set -e
+
+
+pkgctl_version_usage() {
+	local -r COMMAND=${_DEVTOOLS_COMMAND:-${BASH_SOURCE[0]##*/}}
+    cat <<- _EOF_
+		Usage: ${COMMAND} [OPTIONS]
+
+		Shows the current version information of pkgctl
+
+		OPTIONS
+		    -h, --help    Show this help text
+_EOF_
+}
+
+pkgctl_version_print() {
+	cat <<- _EOF_
+		pkgctl @buildtoolver@
+_EOF_
+}
+
+pkgctl_version() {
+	while (( $# )); do
+		case $1 in
+			-h|--help)
+				pkgctl_version_usage
+				exit 0
+				;;
+			*)
+				die "invalid argument: %s" "$1"
+				;;
+		esac
+	done
+
+	pkgctl_version_print
+}
diff --git a/src/pkgctl.in b/src/pkgctl.in
index 40f9259..1797b32 100644
--- a/src/pkgctl.in
+++ b/src/pkgctl.in
@@ -25,6 +25,7 @@ usage() {
 		    diff    Compare package files using different modes
 		    release Release step to commit, tag and upload build artifacts
 		    repo    Manage Git packaging repositories and their configuration
+		    version Show pkgctl version information
 
 		OPTIONS
 		    -h, --help     Show this help text
@@ -93,6 +94,14 @@ while (( $# )); do
 			pkgctl_release "$@"
 			exit 0
 			;;
+		version|--version|-V)
+			_DEVTOOLS_COMMAND+=" $1"
+			shift
+			# shellcheck source=src/lib/version/version.sh
+			source "${_DEVTOOLS_LIBRARY_DIR}"/lib/version/version.sh
+			pkgctl_version "$@"
+			exit 0
+			;;
 		*)
 			die "invalid command: %s" "$1"
 			;;