Add custom open command override

internal/openfolder/custom.go

@@ -0,0 +1,72 @@
+package openfolder
+
+import (
+	"errors"
+	"os/exec"
+	"strings"
+)
+
+// OpenLocationCustom executes a user-defined command string, substituting %1
+// with the given path. The command string is split into executable + arguments
+// using shell-like quoting rules (double quotes are respected).
+//
+// Example command: doublecmd.exe -C -T -P L -L "%1"
+func OpenLocationCustom(command string, path string) error {
+	expanded := strings.ReplaceAll(command, "%1", path)
+
+	args, err := splitCommand(expanded)
+	if err != nil {
+		return err
+	}
+	if len(args) == 0 {
+		return errors.New("open_location_command: empty command after expansion")
+	}
+
+	return exec.Command(args[0], args[1:]...).Start()
+}
+
+// splitCommand splits a command string into tokens, respecting double-quoted
+// segments. Quotes are removed from the resulting tokens. Backslash escaping
+// of a double quote (\") inside a quoted segment is supported.
+func splitCommand(s string) ([]string, error) {
+	var tokens []string
+	var current strings.Builder
+	inQuote := false
+	hasToken := false
+
+	for i := 0; i < len(s); i++ {
+		ch := s[i]
+
+		switch {
+		case ch == '"':
+			inQuote = !inQuote
+			hasToken = true // even empty quotes produce a token part
+
+		case ch == '\\' && inQuote && i+1 < len(s) && s[i+1] == '"':
+			// escaped quote inside a quoted segment
+			current.WriteByte('"')
+			i++ // skip the next quote
+
+		case (ch == ' ' || ch == '\t') && !inQuote:
+			if hasToken {
+				tokens = append(tokens, current.String())
+				current.Reset()
+				hasToken = false
+			}
+
+		default:
+			current.WriteByte(ch)
+			hasToken = true
+		}
+	}
+
+	if inQuote {
+		return nil, errors.New("open_location_command: unterminated double quote")
+	}
+
+	if hasToken {
+		tokens = append(tokens, current.String())
+	}
+
+	return tokens, nil
+}