Work on completion of file args

tools/completion/kitty.go

@@ -0,0 +1,47 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package completion
+
+import (
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+var _ = fmt.Print
+
+func complete_kitty(completions *Completions, word string, arg_num int) {
+	exes := complete_executables_in_path(word)
+	if len(exes) > 0 {
+		mg := completions.add_match_group("Executables in PATH")
+		for _, exe := range exes {
+			mg.add_match(exe)
+		}
+	}
+
+	if len(word) > 0 && (filepath.IsAbs(word) || strings.HasPrefix(word, "./")) {
+		mg := completions.add_match_group("Executables")
+		mg.IsFiles = true
+
+		complete_files(word, func(q, abspath string, d fs.DirEntry) error {
+			if d.IsDir() {
+				// only allow directories that have sub-dirs or executable files in them
+				entries, err := os.ReadDir(abspath)
+				if err == nil {
+					for _, x := range entries {
+						if x.IsDir() || unix.Access(filepath.Join(abspath, x.Name()), unix.X_OK) == nil {
+							mg.add_match(q)
+						}
+					}
+				}
+			} else if unix.Access(abspath, unix.X_OK) == nil {
+				mg.add_match(q)
+			}
+			return nil
+		})
+	}
+}