feat(addon): add <directory> marker for subproc

closes #185

Author: sentriz

addon/subproc/subproc.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"log/slog"
 	"os/exec"
+	"path/filepath"
 	"strings"
 
 	"github.com/google/shlex"
@@ -38,7 +39,8 @@ func NewSubprocAddon(conf string) (SubprocAddon, error) {
 }
 
 const (
-	markerFiles = "<files>"
+	markerFiles     = "<files>"
+	markerDirectory = "<directory>"
 )
 
 func (s SubprocAddon) Check() error {
@@ -49,11 +51,22 @@ func (s SubprocAddon) Check() error {
 }
 
 func (s SubprocAddon) ProcessRelease(ctx context.Context, paths []string) error {
+	var pathsDirectory string
+	for _, path := range paths {
+		pd := filepath.Dir(path)
+		if pathsDirectory != "" && pd != pathsDirectory {
+			return errors.New("addon called with paths from two different directories")
+		}
+		pathsDirectory = pd
+	}
+
 	var args []string
 	for _, arg := range s.args {
 		switch arg {
 		case markerFiles:
 			args = append(args, paths...)
+		case markerDirectory:
+			args = append(args, pathsDirectory)
 		default:
 			args = append(args, arg)
 		}

cmd/wrtag/testdata/scripts/addon-subproc.txtar

@@ -1,9 +1,9 @@
 env WRTAG_PATH_FORMAT='albums/{{ .Release.Title }}/{{ .TrackNum }}{{ .Ext }}'
 env WRTAG_LOG_LEVEL=debug
-env WRTAG_ADDON='subproc sh -c "true", subproc sh echo-script out <files>'
+env WRTAG_ADDON='subproc sh -c "true", subproc sh echo-script out <directory> -- <files>'
 
 exec wrtag -config
-stdout 'addon.*subproc \("sh" "-c" "true"\), subproc \("sh" "echo-script" "out" "<files>"\)'
+stdout 'addon.*subproc \("sh" "-c" "true"\), subproc \("sh" "echo-script" "out" "<directory>" "--" "<files>"\)'
 
 exec tag write 'kat_moda/1.flac'
 exec tag write 'kat_moda/2.flac'
@@ -21,7 +21,9 @@ for f in "$@"; do
     echo "${f#$PWD/}" >>"$out"
 done
 -- exp-out --
-got 3 files
+got 5 files
+albums/Kat Moda
+--
 albums/Kat Moda/1.flac
 albums/Kat Moda/2.flac
 albums/Kat Moda/3.flac