1 files changed, 89 insertions, 0 deletions
diff --git a/packages/turbo-ignore/src/args.ts b/packages/turbo-ignore/src/args.ts
new file mode 100644
index 0000000..8d6015c
--- /dev/null
+++ b/packages/turbo-ignore/src/args.ts
@@ -0,0 +1,89 @@
+import pkg from "../package.json";
+import { TurboIgnoreArgs } from "./types";
+import {
+  skipAllCommits,
+  forceAllCommits,
+  skipWorkspaceCommits,
+  forceWorkspaceCommits,
+} from "./checkCommit";
+
+export const help = `
+turbo-ignore
+
+Automatically ignore builds that have no changes
+
+Usage:
+  $ npx turbo-ignore [<workspace>] [flags...]
+
+If <workspace> is not provided, it will be inferred from the "name"
+field of the "package.json" located at the current working directory.
+
+Flags:
+  --fallback=<ref>    On Vercel, if no previously deployed SHA is available to compare against,
+                      fallback to comparing against the provided ref
+  --help, -h          Show this help message
+  --version, -v       Show the version of this script
+
+---
+
+turbo-ignore will also check for special commit messages to indicate if a build should be skipped or not.
+
+Skip turbo-ignore check and automatically ignore:
+${[...skipAllCommits, ...skipWorkspaceCommits({ workspace: "<workspace>" })]
+  .map((msg) => `  - ${msg}`)
+  .join("\n")}
+
+Skip turbo-ignore check and automatically deploy:
+${[...forceAllCommits, ...forceWorkspaceCommits({ workspace: "<workspace>" })]
+  .map((msg) => `  - ${msg}`)
+  .join("\n")}
+`;
+
+// simple args parser because we don't want to pull in a dependency
+// and we don't need many features
+export default function parseArgs({
+  argv,
+}: {
+  argv: Array<string>;
+}): TurboIgnoreArgs {
+  const args: TurboIgnoreArgs = { directory: process.cwd() };
+
+  // find all flags
+  const flags = new Set(
+    argv
+      .filter((args) => args.startsWith("-"))
+      .map((flag) => flag.replace(/-/g, ""))
+  );
+
+  // handle help flag and exit
+  if (flags.has("help") || flags.has("h")) {
+    console.log(help);
+    process.exit(0);
+  }
+  // handle version flag and exit
+  if (flags.has("version") || flags.has("v")) {
+    console.log(pkg.version);
+    process.exit(0);
+  }
+
+  // set workspace (if provided)
+  if (argv.length && !argv[0].startsWith("-")) {
+    args.workspace = argv[0];
+  }
+
+  // set task (if provided)
+  const taskArgSentinel = "--task=";
+  const taskArg = argv.find((arg) => arg.startsWith(taskArgSentinel));
+  if (taskArg && taskArg.length > taskArgSentinel.length) {
+    args.task = taskArg.split("=")[1];
+  }
+
+  // set fallback (if provided)
+  const fallbackSentinel = "--fallback=";
+  const fallbackArg = argv.find((arg) => arg.startsWith(fallbackSentinel));
+  if (fallbackArg && fallbackArg.length > fallbackSentinel.length) {
+    args.fallback = fallbackArg.split("=")[1];
+  }
+
+  return args;
+}