add command cut

package.json

@@ -21,6 +21,8 @@
     "fs-extra": "^11.1.1",
     "markdown-utils": "^1.0.0",
     "remeda": "^1.14.0",
+    "semver": "^7.5.0",
+    "simple-git": "^3.18.0",
     "yaml": "^2.2.2",
     "yargs": "^17.7.2"
   },

src/changelord.js

@@ -11,6 +11,7 @@ import print from "./command/print.js";
 import init from "./command/init.js";
 import schema from "./command/schema.js";
 import add from "./command/add.js";
+import cut from "./command/cut.js";
 
 consola.raw = (...args) => console.log(...args);
 
@@ -20,13 +21,11 @@ yargs(hideBin(process.argv))
   })
   .default("source", join(process.cwd(), "CHANGELOG.yml"))
   .describe("source", "changelog source")
-  .command({
-    ...print,
-    command: "$0",
-  })
+  .command(print)
   .command(init)
   .command(add)
   .command(schema)
+  .command(cut)
   .command(print)
   .help()
   .parse();

src/command/cut.js

@@ -0,0 +1,68 @@
+import yaml from "yaml";
+import fs from "fs-extra";
+import u from "@yanick/updeep-remeda";
+import semverInc from "semver/functions/inc.js";
+import { simpleGit } from "simple-git";
+
+const code_churn = async (previous_version) => {
+  previous_version = previous_version
+    ? "v" + previous_version
+    : "4b825dc642cb6eb9a060e54bf8d69288fbee4904"; // empty tree sha1
+
+  return simpleGit().diff(["--shortstat", previous_version, "HEAD"]);
+};
+
+const handler = async (config) => {
+  config.consola.start("cutting the next version...");
+  const changelog = yaml.parse(await fs.readFile(config.source, "utf-8"));
+
+  const next = changelog.releases.find(u.matches({ version: "NEXT" }));
+
+  if (!next) throw new Error("no changes since last version, aborting");
+
+  const previous_version = changelog.releases.find(
+    ({ version }) => version !== "NEXT"
+  );
+
+  next.date = new Date().toISOString().replace(/T.*/, "");
+
+  const type_to_level = (type = "") =>
+    changelog.change_types.find((t) => t.keywords.includes(type)).level;
+
+  const bump_level = (types) =>
+    types.includes("major")
+      ? "major"
+      : types.includes("minor")
+      ? "minor"
+      : "patch";
+
+  const bumper = bump_level(
+    next.changes.map(({ type }) => type_to_level(type))
+  );
+
+  if (changelog.project.with_stats) {
+    next.changes.push({
+      type: "stats",
+      desc: "code churn:" + (await code_churn(previous_version)),
+    });
+  }
+
+  next.version = semverInc(previous_version ?? "0.0.0", bumper);
+
+  if (config.dry) {
+    config.consola.info("running in dry mode, not saving\n", next);
+  } else {
+    await fs.writeFile(config.source, yaml.stringify(changelog));
+  }
+
+  config.consola.success(`version ${next.version} is cut!`);
+};
+
+export default {
+  command: "cut",
+  desc: "cut the next version",
+  builder: (yargs) => {
+    yargs.boolean("dry");
+  },
+  handler,
+};