add 'git-gather' command

CHANGELOG.yml

@@ -4,6 +4,9 @@ project:
   with_stats: true
   ticket_url: null
 releases:
+  - version: NEXT
+    changes:
+      - add `git-gather` command
   - version: 0.1.0
     changes:
       - port the core of the Perl changelord to JavaScript.

README.md

@@ -82,5 +82,30 @@ Outputs the latest non-NEXT release.
     $ changelord latest-version
     3.2.0
 
+### `changelord git-gather`
+
+Gathers change entries from git commits. If any are found, they are
+added to the changelog.
+
+#### Lower bound of the git log
+
+`git-gather` inspects the git log from the most recent of those
+three points:
+
+- The last change in the NEXT release having a `commit` property.
+- The last tagged version.
+- The beginning of time.
+
+#### Change-like git message
+
+Git messages are compared to the regular expression
+configured at `project.commit_regex`. If none is found, it
+defaults to
+
+    ^(?<type>[^: ]+):(?<desc>.*?)(\[(?<ticket>[^\]]+)\])?$
+
+The regular expression must capture a `desc` field, and may
+capture a `type` and `ticket` as well.
+
 [blog]: https://techblog.babyl.ca/entry/changelord/
 [original]: https://metacpan.org/dist/App-Changelord/view/bin/changelord

src/changelord.js

@@ -6,20 +6,46 @@ import { join } from "path";
 import yaml from "yaml";
 import fs from "fs-extra";
 import consola from "consola";
+import u from "@yanick/updeep-remeda";
 
 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";
-import upcoming from "./command/upcoming.js";
-import latest from "./command/latest-version.js";
+import upcoming, { next_release } from "./command/upcoming.js";
+import latest, { latest_version } from "./command/latest-version.js";
+import git_gather from "./command/git-gather.js";
 
 consola.raw = (...args) => console.log(...args);
 
 yargs(hideBin(process.argv))
-    .config({
-        consola,
+    .middleware((config) => {
+        config.consola = consola;
+        config.changelog = () =>
+            fs.readFile(config.source, "utf-8").then(yaml.parse);
+        config.next_release = next_release.bind(config);
+        config.latest_version = latest_version.bind(config);
+        return config;
+    })
+    .middleware((argv) => {
+        argv.add_to_next = async (entry) => {
+            const changelog = yaml.parse(await fs.readFile(argv.source, "utf-8"));
+
+            let next = changelog.releases.find(u.matches({ version: "NEXT" }));
+            if (!next) {
+                next = { version: "NEXT", changes: [] };
+                changelog.releases.unshift(next);
+            }
+
+            if (Object.keys(entry).length === 1) {
+                entry = entry.desc;
+            }
+
+            next.changes.push(entry);
+
+            return fs.writeFile(argv.source, yaml.stringify(changelog));
+        };
     })
     .default("source", join(process.cwd(), "CHANGELOG.yml"))
     .describe("source", "changelog source")
@@ -30,6 +56,7 @@ yargs(hideBin(process.argv))
     .command(schema)
     .command(upcoming)
     .command(latest)
+    .command(git_gather)
     .strictCommands()
     .help()
     .parse();

src/command/add.js

@@ -28,26 +28,7 @@ export default {
             .string("ticket")
             .describe("ticket", "ticket associated with the change")
             .string("type")
-            .describe("type", "type of change")
-            .middleware((argv) => {
-                argv.add_to_next = async (entry) => {
-                    const changelog = yaml.parse(await fs.readFile(argv.source, "utf-8"));
-
-                    let next = changelog.releases.find(u.matches({ version: "NEXT" }));
-                    if (!next) {
-                        next = { version: "NEXT", changes: [] };
-                        changelog.releases.unshift(next);
-                    }
-
-                    if (Object.keys(entry).length === 1) {
-                        entry = entry.desc;
-                    }
-
-                    next.changes.push(entry);
-
-                    return fs.writeFile(argv.source, yaml.stringify(changelog));
-                };
-            });
+            .describe("type", "type of change");
     },
     handler,
 };

src/command/git-gather.js

@@ -0,0 +1,51 @@
+import simpleGit from "simple-git";
+import { prop, compact, pickBy } from "remeda";
+
+const handler = async (config) => {
+    const next = await config.next_release();
+    const seen_sha1s = compact(next?.changes.map(prop("commit")));
+
+    const git = simpleGit();
+
+    const { version } = await config.latest_version();
+
+    let { all: commits } = await git.log({
+        from: "v" + version,
+    });
+
+    config.consola.start(`gathering changes since v${version}`);
+
+    commits = commits.filter(({ hash }) => !seen_sha1s.includes(hash));
+
+    const regex = new RegExp(
+        (await config.changelog().project?.commit_regex) ??
+        /^(?<type>[^: ]+):(?<desc>.*?)(\[(?<ticket>[^\]]+)\])?$/
+    );
+
+    const changes = commits
+        .map((commit) => [commit, commit.message.match(regex)])
+        .filter((x) => x[1])
+        .map(([commit, res]) =>
+            pickBy({ ...res.groups, commit: commit.hash }, (x) => x)
+        );
+
+    if (changes.length === 0) {
+        config.consola.success("no changes detected");
+        return;
+    }
+
+    for (const change of changes) {
+        config.consola.info(`${change.type}: ${change.desc}`);
+        config.add_to_next(change);
+    }
+    config.consola.success("done");
+};
+
+export default {
+    command: "git-gather",
+    desc: "gather change entries from git commits",
+    builder: (yargs) => {
+        yargs;
+    },
+    handler,
+};

src/command/latest-version.js

@@ -1,12 +1,14 @@
 import yaml from "yaml";
 import fs from "fs-extra";
 
-const handler = async (config) => {
-  const changelog = yaml.parse(await fs.readFile(config.source, "utf-8"));
+export async function latest_version() {
+    const changelog = await this.changelog();
 
-  const latest_version = changelog.releases.find(
-    ({ version }) => version !== "NEXT"
-  );
+    return changelog.releases.find(({ version }) => version !== "NEXT");
+}
+
+const handler = async (config) => {
+    const latest_version = config.latest_version()?.version ?? "0.0.0";
 
     if (config.json) {
         config.consola.raw(latest_version);

src/command/upcoming.js

@@ -3,6 +3,16 @@ import fs from "fs-extra";
 import yaml from "yaml";
 import { render_release } from "./print.js";
 
+export async function next_release() {
+    const source = await fs.readFile(this.source, "utf-8").then(yaml.parse);
+    return (
+        source.releases.find(u.matches({ version: "NEXT" })) ?? {
+            version: "NEXT",
+            changes: [],
+        }
+    );
+}
+
 const handler = async (config) => {
     const source = await fs.readFile(config.source, "utf-8").then(yaml.parse);