tmp

completers/ffmpeg_completer/cmd/root.go

@@ -306,14 +306,33 @@ func actionFlags() carapace.Action {
 				"-spre", "set the subtitle options to the indicated preset",
 			)
 		default:
-			return carapace.ActionValues()
+			switch c.Parts[0] {
+			case "-c":
+				return carapace.ActionValuesDescribed(
+					"a", "audio",
+					"v", "video",
+				)
+			default:
+				return carapace.ActionValues()
+			}
 		}
 	}).Tag("flags")
 }
 
 func actionFlagArguments(flag string) carapace.Action {
 	name := strings.SplitN(strings.TrimLeft(flag, "-"), ":", 2)[0]
 	switch name {
+	case "c":
+		switch flag {
+		case "-c:a":
+			// TODO audio codecs
+			return ffmpeg.ActionCodecs()
+		case "-c:v":
+			return ffmpeg.ActionCodecs()
+			// TODO video codecs
+		default:
+			return carapace.ActionValues()
+		}
 	case "h", "?", "help":
 		return carapace.ActionMultiPartsN("=", 2, func(c carapace.Context) carapace.Action {
 			switch len(c.Parts) {

pkg/actions/tools/ffmpeg/codec.go

@@ -0,0 +1,24 @@
+package ffmpeg
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/rsteube/carapace"
+)
+
+func ActionCodecs() carapace.Action {
+	return carapace.ActionExecCommand("ffmpeg", "-hide_banner", "-codecs")(func(output []byte) carapace.Action {
+		lines := strings.Split(string(output), "\n")
+		r := regexp.MustCompile(`^.{7} (?P<codec>[^ ]+) +(?P<description>.*)$`)
+
+		vals := make([]string, 0)
+		for _, line := range lines[10 : len(lines)-1] {
+			if r.MatchString(line) {
+				matches := r.FindStringSubmatch(line)
+				vals = append(vals, matches[1], matches[2])
+			}
+		}
+		return carapace.ActionValuesDescribed(vals...)
+	})
+}