Merge pull request #1331 from rsteube/cargo-nightly-flags

cargo: nightly flag completion

completers/cargo_completer/cmd/root.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/rsteube/carapace"
 	"github.com/rsteube/carapace-bin/pkg/actions/bridge"
+	"github.com/rsteube/carapace-bin/pkg/actions/tools/cargo"
 	"github.com/rsteube/carapace/pkg/style"
 	"github.com/spf13/cobra"
 )
@@ -37,6 +38,7 @@ func init() {
 	rootCmd.Flags().BoolP("version", "V", false, "Print version info and exit")
 
 	carapace.Gen(rootCmd).FlagCompletion(carapace.ActionMap{
+		"Z":     cargo.ActionNightlyFlags(),
 		"color": carapace.ActionValues("auto", "never", "always").StyleF(style.ForKeyword),
 	})
 

pkg/actions/tools/cargo/nightly.go

@@ -0,0 +1,27 @@
+package cargo
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/rsteube/carapace"
+)
+
+// ActionNightlyFlags completes nightly flags
+//
+//	allow-features (Allow *only* the listed unstable features)
+//	avoid-dev-deps (Avoid installing dev-dependencies if possible)
+func ActionNightlyFlags() carapace.Action {
+	return carapace.ActionExecCommand("cargo", "-Z", "help")(func(output []byte) carapace.Action {
+		lines := strings.Split(string(output), "\n")
+		re := regexp.MustCompile(`^ +-Z (?P<name>[^ ]+) +-- (?P<description>.*)$`)
+
+		vals := make([]string, 0)
+		for _, line := range lines {
+			if matches := re.FindStringSubmatch(line); matches != nil {
+				vals = append(vals, matches[1], matches[2])
+			}
+		}
+		return carapace.ActionValuesDescribed(vals...)
+	})
+}