refactor(cli): extract fish completion line builders

src/cli/completion-fish.ts

@@ -0,0 +1,41 @@
+export function escapeFishDescription(value: string): string {
+  return value.replace(/'/g, "'\\''");
+}
+
+function parseOptionFlags(flags: string): { long?: string; short?: string } {
+  const parts = flags.split(/[ ,|]+/);
+  const long = parts.find((flag) => flag.startsWith("--"))?.replace(/^--/, "");
+  const short = parts
+    .find((flag) => flag.startsWith("-") && !flag.startsWith("--"))
+    ?.replace(/^-/, "");
+  return { long, short };
+}
+
+export function buildFishSubcommandCompletionLine(params: {
+  rootCmd: string;
+  condition: string;
+  name: string;
+  description: string;
+}): string {
+  const desc = escapeFishDescription(params.description);
+  return `complete -c ${params.rootCmd} -n "${params.condition}" -a "${params.name}" -d '${desc}'\n`;
+}
+
+export function buildFishOptionCompletionLine(params: {
+  rootCmd: string;
+  condition: string;
+  flags: string;
+  description: string;
+}): string {
+  const { short, long } = parseOptionFlags(params.flags);
+  const desc = escapeFishDescription(params.description);
+  let line = `complete -c ${params.rootCmd} -n "${params.condition}"`;
+  if (short) {
+    line += ` -s ${short}`;
+  }
+  if (long) {
+    line += ` -l ${long}`;
+  }
+  line += ` -d '${desc}'\n`;
+  return line;
+}