feat: add versioning

cli.go

@@ -8,6 +8,17 @@ import (
 
 var completionShells = []string{"bash", "zsh", "fish"}
 
+func handleVersionCommand(args []string, output io.Writer) (bool, error) {
+	if len(args) == 0 || args[0] != "--version" {
+		return false, nil
+	}
+	if len(args) != 1 {
+		return true, fmt.Errorf("usage: diple --version")
+	}
+	_, err := fmt.Fprintf(output, "diple %s\n", dipleVersion)
+	return true, err
+}
+
 func handleCompletionCommand(args []string, output io.Writer) (bool, error) {
 	if len(args) == 0 || args[0] != "completion" {
 		return false, nil
@@ -55,6 +66,7 @@ func writeCLIHelp(output io.Writer, defaults Config, configPath string) {
 
 Usage:
   diple [options]
+  diple --version
   diple completion <bash|zsh|fish>
   diple help
 
@@ -92,6 +104,7 @@ Local state:
 
 Other:
   -h, --help                Show this help and exit.
+  --version                 Show the application version and exit.
 
 Boolean options accept explicit values, for example --cache=false.
 Command-line options override TOML settings. GH_REPO is used only when
@@ -158,7 +171,7 @@ _diple_completion() {
             ;;
     esac
 
-    local options="--repo --all --limit --poll --endpoint --theme --dashboard-mode --thread-list-width --fold-resolved --compact-reviews --path-scroll --path-scroll-interval --editor-mode --config --cache --cache-max-age --cache-dir --help -h"
+    local options="--repo --all --limit --poll --endpoint --theme --dashboard-mode --thread-list-width --fold-resolved --compact-reviews --path-scroll --path-scroll-interval --editor-mode --config --cache --cache-max-age --cache-dir --version --help -h"
     COMPREPLY=($(compgen -W "${options}" -- "${current}"))
 }
 complete -F _diple_completion diple
@@ -202,6 +215,7 @@ _diple() {
     '--cache=[enable local read cache]:boolean:(true false)' \
     '--cache-max-age[maximum offline cache age]:duration:' \
     '--cache-dir[local read-cache directory]:directory:_directories' \
+    '--version[show application version]' \
     '(-h --help)'{-h,--help}'[show help]'
 }
 
@@ -234,5 +248,6 @@ complete -c diple -l config -r -F -d 'TOML configuration file'
 complete -c diple -l cache -d 'Enable local read cache'
 complete -c diple -l cache-max-age -x -d 'Maximum offline cache age'
 complete -c diple -l cache-dir -r -a '(__fish_complete_directories)' -d 'Local read-cache directory'
+complete -c diple -l version -d 'Show application version'
 complete -c diple -s h -l help -d 'Show help'
 `