add ShlexSplit() as an alternative to shlex.Split()

api/internal/plugins/execplugin/shlex.go

@@ -5,15 +5,55 @@ package execplugin
 
 import (
 	"fmt"
-
-	shlex "github.com/carapace-sh/carapace-shlex"
+	"strings"
+	"unicode"
 )
 
+// ShlexSplit splits a string into a slice of strings using shell-style rules for quoting and commenting
+// Similar to Python's shlex.split with comments enabled
 func ShlexSplit(s string) ([]string, error) {
-	// return shlexSplit(s)
-	tokens, err := shlex.Split(s)
-	if err != nil {
-		return nil, fmt.Errorf("shlex split error: %w", err)
-	}
-	return tokens.Strings(), nil
+	return shlexSplit(s)
+}
+
+func shlexSplit(s string) ([]string, error) {
+	result := []string{}
+
+	var current strings.Builder
+	var quote rune
+	var escaped bool
+
+	for _, r := range s {
+		switch {
+		case escaped:
+			current.WriteRune(r)
+			escaped = false
+		case r == '\\' && quote != '\'':
+			escaped = true
+		case (r == '\'' || r == '"') && quote == 0:
+			quote = r
+		case r == quote:
+			quote = 0
+		case r == '#' && quote == 0:
+			// Comment starts, ignore the rest of the line
+			if current.Len() > 0 {
+				result = append(result, current.String())
+			}
+			return result, nil
+		case quote == 0 && unicode.IsSpace(r):
+			if current.Len() > 0 {
+				result = append(result, current.String())
+				current.Reset()
+			}
+		default:
+			current.WriteRune(r)
+		}
+	}
+
+	if quote != 0 {
+		return nil, fmt.Errorf("unclosed quote in string")
+	}
+	if current.Len() > 0 {
+		result = append(result, current.String())
+	}
+	return result, nil
 }