added spec generation

carapace.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"sort"
 	"strings"
 
 	"github.com/rsteube/carapace/internal/common"
@@ -21,6 +22,7 @@ import (
 	"github.com/rsteube/carapace/internal/shell/nushell"
 	"github.com/rsteube/carapace/internal/shell/oil"
 	"github.com/rsteube/carapace/internal/shell/powershell"
+	"github.com/rsteube/carapace/internal/shell/spec"
 	"github.com/rsteube/carapace/internal/shell/tcsh"
 	"github.com/rsteube/carapace/internal/shell/xonsh"
 	"github.com/rsteube/carapace/internal/shell/zsh"
@@ -135,14 +137,21 @@ func (c Carapace) Snippet(shell string) (string, error) {
 		"nushell":    nushell.Snippet,
 		"oil":        oil.Snippet,
 		"powershell": powershell.Snippet,
+		"spec":       spec.Snippet,
 		"tcsh":       tcsh.Snippet,
 		"xonsh":      xonsh.Snippet,
 		"zsh":        zsh.Snippet,
 	}
 	if s, ok := shellSnippets[shell]; ok {
 		return s(c.cmd.Root()), nil
 	}
-	return "", fmt.Errorf("expected 'bash', bash-ble, 'elvish', 'fish', 'ion', 'nushell', 'oil', 'powershell', 'tcsh', 'xonsh' or 'zsh' [was: %v]", shell)
+
+	expected := make([]string, 0)
+	for key := range shellSnippets {
+		expected = append(expected, key)
+	}
+	sort.Strings(expected)
+	return "", fmt.Errorf("expected one of '%v' [was: %v]", strings.Join(expected, "', '"), shell)
 }
 
 func lookupFlag(cmd *cobra.Command, arg string) (flag *pflag.Flag) {
@@ -199,6 +208,7 @@ func addCompletionCommand(cmd *cobra.Command) {
 			"nushell", "#29d866",
 			"oil", "#373a36",
 			"powershell", "#e8a16f",
+			"spec", style.Default,
 			"tcsh", "#412f09",
 			"xonsh", "#a8ffa9",
 			"zsh", "#efda53",

internal/shell/spec/snippet.go

@@ -0,0 +1,25 @@
+// Package spec provides spec file generation for use with carapace-bin
+package spec
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/rsteube/carapace/internal/uid"
+	"github.com/spf13/cobra"
+)
+
+// Snippet generates the spec file
+func Snippet(cmd *cobra.Command) string {
+	replacer := strings.NewReplacer( // TODO might need more replacements
+		`"`, `\"`,
+		`'`, `\'`,
+		`[`, `\[`,
+		`]`, `\]`,
+	)
+	return fmt.Sprintf(`name: %v
+description: %v
+completion:
+  positionalany: ["$_bridge.Carapace(%v)"]
+`, uid.Executable(), replacer.Replace(cmd.Short), uid.Executable())
+}