add the changelog

fix #14

.gitignore

@@ -1,2 +1,3 @@
 node_modules/
 pnpm-lock.yaml
+*.tgz

.npmignore

@@ -0,0 +1,6 @@
+_templates
+Taskfile.yaml
+*.tgz
+prettier.config.*
+changelog-next/
+*.test.js

CHANGELOG.md

@@ -0,0 +1,37 @@
+# Changelog for [changelord][homepage]
+
+
+
+## 0.2.0 2023-05-18
+
+
+### Features
+
+  * add `git-gather` command
+  * add 'next' to alias to 'upcoming'
+  * cutting a release also add a new NEXT release
+  * git-gather also filters on descs
+  * add the validate command
+  * support changelog-next directory
+
+### Statistics
+
+  * code churn: 21 files changed, 563 insertions(+), 153 deletions(-)
+
+
+
+## 0.1.0 2023-05-16
+
+  * port the core of the Perl changelord to JavaScript.
+
+### Statistics
+
+  * code churn: 23 files changed, 767 insertions(+)
+
+
+
+
+
+
+
+    [homepage]: https://git.babyl.ca/yanick/changelord.js

CHANGELOG.yml

@@ -1,12 +1,41 @@
 project:
-  name: null
-  homepage: null
+  name: changelord
+  homepage: https://git.babyl.ca/yanick/changelord.js
   with_stats: true
-  ticket_url: null
+  next_directory: ./changelog-next
 releases:
   - version: NEXT
     changes: []
+  - version: 0.2.0
+    changes:
+      - type: feat
+        desc: add `git-gather` command
+      - type: feat
+        desc: add 'next' to alias to 'upcoming'
+      - type: feat
+        desc: cutting a release also add a new NEXT release
+      - type: feat
+        desc: git-gather also filters on descs
+      - type: feat
+        desc: add the validate command
+      - desc: support changelog-next directory
+        type: feat
+      - type: stats
+        desc: |
+          code churn: 21 files changed, 563 insertions(+), 153 deletions(-)
+    date: 2023-05-18
+  - version: 0.1.0
+    changes:
+      - port the core of the Perl changelord to JavaScript.
+      - type: stats
+        desc: |
+          code churn: 23 files changed, 767 insertions(+)
+    date: 2023-05-16
 change_types:
+  - title: ""
+    level: minor
+    keywords:
+      - ""
   - title: Features
     level: minor
     keywords:

README.md

@@ -0,0 +1,130 @@
+# Changelord, registrar of deeds extraordinaire
+
+Changelord is a changelog manager scratching my particular itches.
+It's cli-based, and keep its data in a YAML file adhering
+to a well-defined schema.
+
+The first iteration of `changelord` was written [in Perl][original]. You can
+read its [introductory article][blog] on my blog.
+
+## Installation
+
+    pnpm install changelord
+
+## `changelog-next` directory
+
+If you want to mininize merge conflicts in `CHANGELOG.yml`,
+you can set the option `project.next_directory` to a directory (typically
+`./changelog-next`) that will hold yaml files containing the
+changes for the NEXT release. Each of those files is expected to
+have a list of changes.
+
+## CLI commands
+
+### Global options
+
+#### `--help`
+
+Outputs the list of commands and options.
+
+#### `--version`
+
+Outputs the `changelord` version.
+
+#### `--source`
+
+Specifies which source yaml file to use. Defaults to the `CHANGELOG.yml` file
+in the current directory.
+
+### `changelord init`
+
+Initializes the changelog source file. The YAML file is made of three
+sections.
+
+- `project` -- contains information and configuration about the project itself.
+- `releases` -- the entries for the changelog proper.
+- `change_types` -- defines all types of changes this project supports.
+
+### `changelord add`
+
+Adds an entry to the `NEXT` release.
+
+If `project.next_directory` is defined, the entry will be added to that
+directory instead of directly into `CHANGELOG.yml`.
+
+    $ changelord add --type=maint added a changelog to the project.
+
+#### Options
+
+- `--type` -- type of change.
+- `--ticket` -- associated ticket.
+
+### `changelord print`
+
+Renders the changelog as markdown.
+
+#### Options
+
+- `--no-next` -- don't show the `NEXT` section.
+
+### `changelord cut`
+
+Cuts the next release. That is, resolves the `NEXT` version number based on the
+latest version and the changes in the `NEXT` section, and sets its date as
+today. Modifies the source file with the result.
+
+If the `project.next_directory` option is present,
+all the changes in that directory are
+merged to `CHANGELOG.yml` and the files themselves are deleted.
+
+#### Options
+
+- `--dry` -- Resolves the next version but only outputs the resulting section
+  without changing the source file.
+
+### `changelord schema`
+
+Outputs the JSON schema defining the structure of the source file.
+
+### `changelord upcoming`
+
+Outputs the changes listed in the `NEXT` release.
+
+### `changelord latest-version`
+
+Outputs the latest non-NEXT release.
+
+    $ changelord latest-version
+    3.2.0
+
+### `changelord validate`
+
+Validates the changelog source against its json schema.
+
+### `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>[^: ]+):\s*(?<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

Taskfile.yaml

@@ -0,0 +1,22 @@
+# https://taskfile.dev
+version: "3"
+
+vars:
+  PARENT_BRANCH: main
+
+tasks:
+  test: vitest run src
+  test:dev: vitest src
+
+  integrate:
+    deps: [test]
+    preconditions:
+      - sh: git is-clean
+        msg: checkout not clean
+      - sh: git diff-ls  {{.PARENT_BRANCH}} | grep test
+        msg: no tests were added
+      - sh: git diff-ls  {{.PARENT_BRANCH}} | grep CHANGELOG.yml
+        msg: no changelog entry detected
+    cmds:
+      - git checkout {{.PARENT_BRANCH}}
+      - git weld -

_templates/command/new/command.ejs.t

@@ -0,0 +1,17 @@
+---
+to: src/command/<%= name %>.js
+---
+
+const handler = async (config) => {
+    // DO SOMETHING
+};
+
+export default {
+    command: '<%= name %>',
+    desc :  'TODO',
+    builder: (yargs) => {
+        yargs
+    },
+    handler,
+}
+

_templates/generator/help/index.ejs.t

@@ -0,0 +1,5 @@
+---
+message: |
+  hygen {bold generator new} --name [NAME] --action [ACTION]
+  hygen {bold generator with-prompt} --name [NAME] --action [ACTION]
+---

_templates/generator/new/hello.ejs.t

@@ -0,0 +1,18 @@
+---
+to: _templates/<%= name %>/<%= action || 'new' %>/hello.ejs.t
+---
+---
+to: app/hello.js
+---
+const hello = ```
+Hello!
+This is your first hygen template.
+
+Learn what it can do here:
+
+https://github.com/jondot/hygen
+```
+
+console.log(hello)
+
+

_templates/generator/with-prompt/hello.ejs.t

@@ -0,0 +1,18 @@
+---
+to: _templates/<%= name %>/<%= action || 'new' %>/hello.ejs.t
+---
+---
+to: app/hello.js
+---
+const hello = ```
+Hello!
+This is your first prompt based hygen template.
+
+Learn what it can do here:
+
+https://github.com/jondot/hygen
+```
+
+console.log(hello)
+
+

_templates/generator/with-prompt/prompt.ejs.t

@@ -0,0 +1,14 @@
+---
+to: _templates/<%= name %>/<%= action || 'new' %>/prompt.js
+---
+
+// see types of prompts:
+// https://github.com/enquirer/enquirer/tree/master/examples
+//
+module.exports = [
+  {
+    type: 'input',
+    name: 'message',
+    message: "What's your message?"
+  }
+]

_templates/init/repo/new-repo.ejs.t

@@ -0,0 +1,4 @@
+---
+setup: <%= name %>
+force: true # this is because mostly, people init into existing folders is safe
+---

package.json

@@ -1,12 +1,20 @@
 {
   "name": "changelord",
-  "version": "0.0.1",
+  "version": "0.2.0",
   "description": "cli-based changelog manager",
   "type": "module",
-  "main": "src/index.js",
+  "main": "src/changelord.js",
   "bin": {
     "changelord": "./src/changelord.js"
   },
+  "repository": {
+    "type": "git",
+    "url": "https://git.babyl.ca/yanick/changelord.js.git"
+  },
+  "bugs": {
+    "url": "https://git.babyl.ca/yanick/changelord.js/issues"
+  },
+  "homepage": "https://git.babyl.ca/yanick/changelord.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -16,12 +24,24 @@
   "author": "Yanick Champoux <yanick@babyl.ca> (http://techblog.babyl.ca/)",
   "license": "ISC",
   "dependencies": {
+    "@sindresorhus/slugify": "^2.2.1",
+    "@yanick/updeep-remeda": "^2.2.0",
+    "ajv": "^8.12.0",
     "consola": "^3.1.0",
+    "filenamify": "^6.0.0",
     "fs-extra": "^11.1.1",
+    "globby": "^13.1.4",
+    "markdown-utils": "^1.0.0",
+    "nanoid": "^4.0.2",
+    "remeda": "^1.14.0",
+    "semver": "^7.5.0",
+    "simple-git": "^3.18.0",
     "yaml": "^2.2.2",
     "yargs": "^17.7.2"
   },
   "devDependencies": {
-    "prettier": "^2.8.8"
+    "prettier": "^2.8.8",
+    "typescript": "^5.0.4",
+    "vitest": "^0.31.0"
   }
 }

prettier.config.mjs

@@ -0,0 +1,9 @@
+export default {
+  endOfLine: "lf",
+  semi: true,
+  singleQuote: false,
+  tabWidth: 2,
+  trailingComma: "es5",
+  bracketSpacing: true,
+  proseWrap: "always",
+};

src/changelog-schema.js

@@ -0,0 +1,118 @@
+export default {
+  type: "object",
+  additionalProperties: false,
+  properties: {
+    change_types: {
+      items: {
+        additionalProperties: false,
+        properties: {
+          keywords: {
+            items: {
+              type: "string",
+            },
+            type: "array",
+          },
+          level: {
+            enum: ["major", "minor", "patch"],
+          },
+          title: {
+            type: "string",
+          },
+        },
+        type: "object",
+      },
+      type: "array",
+    },
+    project: {
+      additionalProperties: false,
+      properties: {
+        homepage: {
+          description: "url of the project's homepage",
+          examples: ["https://github.com/yanick/app-changelord"],
+          type: ["string", "null"],
+        },
+        name: {
+          description: "name of the project",
+          examples: ["App::Changelord"],
+          type: ["null", "string"],
+        },
+        ticket_url: {
+          description:
+            "perl code that takes a ticket string (e.g. 'GH123') via the `$_` variable and turns it into a link.",
+          examples: [
+            "s!GH(\\d+)!https://github.com/yanick/App-Changelord/issue/$1/",
+            {
+              '/^\\d+$/ ? "https://.../$_"': "undef",
+            },
+          ],
+          type: "string",
+        },
+        with_stats: {
+          description: "if true, add git statistics when bumping the version.",
+        },
+        next_directory: {
+          type: "string",
+          description:
+            "directory where the changes for the NEXT release are stashed",
+        },
+      },
+      type: "object",
+    },
+    releases: {
+      items: {
+        oneOf: [
+          {
+            type: "string",
+          },
+          {
+            additionalProperties: false,
+            properties: {
+              changes: {
+                items: {
+                  $ref: "#/$defs/change",
+                },
+                type: "array",
+              },
+              date: {
+                type: ["null", "string"],
+              },
+              version: {
+                type: ["null", "string"],
+              },
+            },
+            type: "object",
+          },
+        ],
+      },
+      type: "array",
+    },
+  },
+  $defs: {
+    change: {
+      oneOf: [
+        {
+          type: "string",
+        },
+        {
+          additionalProperties: false,
+          properties: {
+            commit: {
+              type: ["string", "null"],
+            },
+            desc: {
+              type: "string",
+            },
+            ticket: {
+              type: ["string", "null"],
+            },
+            type: {
+              type: ["string", "null"],
+            },
+          },
+          required: ["desc"],
+          type: "object",
+        },
+      ],
+    },
+  },
+};

src/changelog-schema.yml

@@ -1,59 +0,0 @@
-type: object
-additionalProperties: false
-properties:
-  project:
-    type: object
-    additionalProperties: false
-    properties:
-      homepage:
-        type: [ string, 'null' ]
-        description: url of the project's homepage
-        examples:
-          - https://github.com/yanick/app-changelord
-      name:
-        type: [ 'null', string ]
-        description: name of the project
-        examples:
-          - App::Changelord
-      ticket_url:
-        type: string
-        description: perl code that takes a ticket string (e.g. 'GH123') via the `$_` variable and turns it into a link.
-        examples:
-          - s!GH(\d+)!https://github.com/yanick/App-Changelord/issue/$1/
-          - /^\d+$/ ? "https://.../$_" : undef
-      with_stats:
-        description: if true, add git statistics when bumping the version.
-  change_types:
-    type: array
-    items:
-      type: object
-      additionalProperties: false
-      properties:
-          keywords:
-            type: array
-            items: { type: string }
-          level: { enum: [ major, minor, patch ] }
-          title: { type: string }
-  releases:
-    type: array
-    items:
-      oneOf:
-        - type: string
-        - type: object
-          additionalProperties: false
-          properties:
-            version: { type: [ 'null', string ] }
-            date: { type: ['null',string] }
-            changes: { type: 'array', items: { $ref: '#/$defs/change' } }
-$defs:
-  change:
-    oneOf:
-      - type: string
-      - type: object
-        required: [ desc ]
-        additionalProperties: false
-        properties:
-          desc: { type: string }
-          ticket: { type: [ string, 'null' ] }
-          type: { type: [ string, 'null' ] }
-          commit: { type: [ string, 'null' ] }

src/changelord.js

@@ -1,26 +1,151 @@
 #!/usr/bin/env node
 
-import { hideBin } from 'yargs/helpers';
-import yargs from 'yargs';
-import { join } from 'path';
+import { hideBin } from "yargs/helpers";
+import yargs from "yargs";
+import { join } from "path";
+import yaml from "yaml";
+import fs from "fs-extra";
+import consola from "consola";
+import u from "@yanick/updeep-remeda";
+import { once } from "remeda";
+import simpleGit from "simple-git";
+import Ajv from "ajv";
+import { nanoid } from "nanoid";
+import slugify from "@sindresorhus/slugify";
 
-import print from './command/print.js'
-import init from './command/init.js'
-import schema from './command/schema.js';
-import consola from 'consola';
+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, { next_release } from "./command/upcoming.js";
+import latest, { latest_version } from "./command/latest-version.js";
+import validate from "./command/validate.js";
+import git_gather from "./command/git-gather.js";
+import schemaV1 from "./changelog-schema.js";
+import { globby } from "globby";
+import { flatMap } from "remeda";
 
 consola.raw = (...args) => console.log(...args);
 
 yargs(hideBin(process.argv))
-    .config({
-        consola
+  .middleware((config) => {
+    config.git = once(simpleGit);
+    config.consola = consola;
+    config.changelog = once(() =>
+      fs
+        .readFile(config.source, "utf-8")
+        .then(yaml.parse)
+        .then(async (doc) => {
+          if (!doc.project.next_directory) return doc;
+
+          const changes = await globby([
+            doc.project.next_directory + "/*.yml",
+            doc.project.next_directory + "/*.yaml",
+          ])
+            .then((files) =>
+              Promise.all(
+                files.map((f) => fs.readFile(f, "utf-8").then(yaml.parse))
+              )
+            )
+            .then((r) => r.flat());
+
+          if (changes.length)
+            doc.releases
+              .find((r) => r.version === "NEXT")
+              .changes.push(...changes);
+
+          return doc;
         })
-    .default('source', join( process.cwd(), 'CHANGELOG.yml' ))
-    .describe('source', 'changelog source')
-    .command({
-        ...print,
-        command: '$0',
+        .then((doc) => {
+          const ajv = new Ajv();
+          const validate = ajv.compile(schemaV1);
+          const valid = validate(doc);
+          if (valid) return doc;
+
+          config.consola.error("invalid changelog: ", validate.errors);
+          throw "changelog is invalid";
         })
+    );
+    config.delete_next_dir_entries = async () => {
+      const changelog = await config.changelog();
+      return globby([
+        changelog.project.next_directory + "/*.yml",
+        changelog.project.next_directory + "/*.yaml",
+      ]).then((files) => Promise.all(files.map((f) => fs.remove(f))));
+    };
+    config.save_changelog = async (changelog) => {
+      if (!changelog) changelog = await config.changelog();
+      return fs.writeFile(config.source, yaml.stringify(changelog));
+    };
+    config.next_release = next_release.bind(config);
+    config.latest_version = latest_version.bind(config);
+    return config;
+  })
+  .middleware((argv, yargs) => {
+    argv.yargs = yargs;
+
+    argv.add_to_next = async (entry) => {
+      const dir = await argv.changelog().then((c) => c.project.next_directory);
+
+      if (dir) {
+        await fs.ensureDir(dir);
+        const filename = join(
+          dir,
+          [
+            new Date().toISOString(),
+            entry.ticket,
+            entry.feat,
+            slugify(entry.desc, {
+              separator: "_",
+            }).slice(0, 10),
+          ]
+            .filter((x) => x)
+            .join("-") + ".yml"
+        );
+        argv.consola.info(`writing change to ${filename}`);
+        if (fs.existsSync(filename)) {
+          argv.consola.error(`file ${filename} already exist`);
+          yargs.exit(1);
+        }
+        if (Object.keys(entry).length === 1) {
+          entry = entry.desc;
+        }
+        return fs.writeFile(filename, yaml.stringify([entry]));
+      }
+
+      const changelog = await argv.changelog();
+
+      let next = changelog.releases.find(u.matches({ version: "NEXT" }));
+      if (!next) {
+        changelog.releases.unshift(base_next_version);
+      }
+
+      if (Object.keys(entry).length === 1) {
+        entry = entry.desc;
+      }
+
+      next.changes.push(entry);
+
+      return argv.save_changelog();
+    };
+  })
+  .default("source", join(process.cwd(), "CHANGELOG.yml"))
+  .describe("source", "changelog source")
   .command(init)
+  .command(add)
+  .command(print)
+  .command(cut)
   .command(schema)
-    .command(print).help().parse();
+  .command(upcoming)
+  .command({
+    ...upcoming,
+    command: "next",
+    desc: 'alias for "upcoming"',
+  })
+  .command(latest)
+  .command(git_gather)
+  .command(validate)
+  .strictCommands()
+  .help()
+  .parse();

src/command/add.js

@@ -0,0 +1,34 @@
+import fs from "fs-extra";
+import yaml from "yaml";
+import u from "@yanick/updeep-remeda";
+
+const handler = async (config) => {
+  if (!config.change)
+    throw new Error("can't add a change without a description");
+
+  const entry = {
+    desc: config.change.join(" "),
+  };
+
+  if (config.ticket) entry.ticket = config.ticket;
+  if (config.type) entry.type = config.type;
+
+  config.consola.start(`adding '${entry.desc}' to the changelog`);
+
+  await config.add_to_next(entry);
+
+  config.consola.success("done!");
+};
+
+export default {
+  command: "add [change...]",
+  desc: "add a change to the NEXT release",
+  builder: (yargs) => {
+    yargs
+      .string("ticket")
+      .describe("ticket", "ticket associated with the change")
+      .string("type")
+      .describe("type", "type of change");
+  },
+  handler,
+};

src/command/cut.js

@@ -0,0 +1,83 @@
+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";
+
+import { base_next_version } from "../utils.js";
+
+const code_churn = async (previous_version) => {
+  previous_version = previous_version
+    ? "v" + previous_version.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 = await config.changelog();
+
+  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 ? previous_version.version : "0.0.0",
+    bumper
+  );
+
+  // add a new NEXT
+  changelog.releases.unshift(base_next_version);
+
+  if (config.dry) {
+    config.consola.info("running in dry mode, not saving\n", next);
+  } else {
+    await config.save_changelog(changelog);
+    if (changelog.project?.next_directory) {
+      config.consola.info(
+        `removing files in ${changelog.project.next_directory}`
+      );
+      await config.delete_next_dir_entries();
+    }
+  }
+
+  config.consola.success(`version ${next.version} is cut!`);
+};
+
+export default {
+  command: "cut",
+  desc: "cut the next version",
+  builder: (yargs) => {
+    yargs.boolean("dry");
+  },
+  handler,
+};

src/command/cut.test.js

@@ -0,0 +1,23 @@
+import { test, expect, vi } from "vitest";
+import cut from "./cut.js";
+
+test("add a new NEXT", async () => {
+  const changelog = {
+    releases: [{ version: "NEXT", changes: [] }, { version: "1.0.0" }],
+  };
+
+  const noop = () => {};
+  const config = {
+    consola: {
+      start: noop,
+      success: noop,
+    },
+    changelog: () => changelog,
+    save_changelog: noop,
+  };
+
+  await cut.handler(config);
+
+  expect(changelog.releases[0].version).toBe("NEXT");
+  expect(changelog.releases).toHaveLength(3);
+});

src/command/git-gather.js

@@ -0,0 +1,55 @@
+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 seen_descs = next?.changes.map((change) =>
+    typeof change === "string" ? change : change.desc
+  );
+
+  const git = config.git();
+
+  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>[^: ]+):\s*(?<desc>.*?)(\[(?<ticket>[^\]]+)\])?$/
+  );
+
+  const changes = commits
+    .map((commit) => [commit, commit.message.match(regex)])
+    .filter((x) => x[1])
+    .filter((x) => !seen_descs.includes(x[1].groups.desc))
+    .map(([commit, res]) =>
+      pickBy({ ...res.groups, commit: commit.hash }, (x) => x)
+    );
+
+  if (changes.length === 0) {
+    config.consola.success("no changes detected");
+    return;
+  }
+
+  for (const change of changes) {
+    config.consola.info(`${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/git-gather.test.js

@@ -0,0 +1,28 @@
+import { test, expect, vi } from "vitest";
+import gather from "./git-gather.js";
+
+test("no changes detected", async () => {
+  const changelog = {
+    releases: [{ version: "NEXT", changes: [] }, { version: "1.0.0" }],
+  };
+
+  const noop = () => {};
+  const config = {
+    consola: {
+      start: noop,
+      success: vi.fn(),
+    },
+    changelog: () => changelog,
+    next_release: () => ({
+      changes: [],
+    }),
+    latest_version: () => ({ version: "1.2.3" }),
+    git: () => ({
+      log: () => ({ all: [] }),
+    }),
+  };
+
+  await gather.handler(config);
+
+  expect(config.consola.success).toHaveBeenCalledWith("no changes detected");
+});

src/command/init.js

@@ -1,25 +1,26 @@
-import fs from 'fs-extra';
-import { consola } from 'consola';
-import { stringify } from 'yaml';
+import fs from "fs-extra";
+import { consola } from "consola";
+import { stringify } from "yaml";
 
 const change_types = [
-            { title: 'Features'  , level: 'minor', keywords: [ 'feat' ] } ,
-            { title : 'Bug fixes' , level : 'patch', keywords : [ 'fix' ]  },
-            { title : 'Package maintenance' , level : 'patch', keywords : [ 'chore', 'maint', 'refactor' ]  },
-            { title : 'Statistics' , level : 'patch', keywords : [ 'stats' ]  },
+  { title: "", level: "minor", keywords: [""] },
+  { title: "Features", level: "minor", keywords: ["feat"] },
+  { title: "Bug fixes", level: "patch", keywords: ["fix"] },
+  {
+    title: "Package maintenance",
+    level: "patch",
+    keywords: ["chore", "maint", "refactor"],
+  },
+  { title: "Statistics", level: "patch", keywords: ["stats"] },
 ];
 
-
-const base_changelog = {
+export const base_changelog = {
   project: {
     name: null,
     homepage: null,
     with_stats: true,
-        ticket_url: null,
   },
-    releases: [
-        { version: 'NEXT', changes: [] }
-    ],
+  releases: [{ version: "NEXT", changes: [] }],
   change_types,
 };
 
@@ -33,18 +34,18 @@ const handler = async (config) => {
 
   await fs.writeFile(config.source, stringify(base_changelog));
 
-    consola.success('done!');
-
+  consola.success("done!");
 };
 
 export default {
-    command: 'init',
-    desc :  'initialize new changelog source file',
+  command: "init",
+  desc: "initialize new changelog source file",
   builder: (yargs) => {
-        yargs.boolean('json')
-        .boolean('next')
-        .default('json',false)
-        .default('next',true);
+    yargs
+      .boolean("json")
+      .boolean("next")
+      .default("json", false)
+      .default("next", true);
   },
   handler,
-}
+};

src/command/latest-version.js

@@ -0,0 +1,29 @@
+import yaml from "yaml";
+import fs from "fs-extra";
+
+export async function latest_version() {
+    const changelog = await this.changelog();
+
+    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);
+    } else {
+        config.consola.raw(latest_version.version);
+    }
+};
+
+export default {
+    command: "latest-version",
+    desc: "output the latest version present in the changelog",
+    builder: (yargs) => {
+        yargs
+            .boolean("json")
+            .describe("json", "output latest version entry as json");
+    },
+    handler,
+};

src/command/print.js

@@ -1,16 +1,135 @@
+import * as R from "remeda";
+import fs from "fs-extra";
+import yaml from "yaml";
+import mkd from "markdown-utils";
 
-const handler = (...args) => {
-    console.log('hi!',args);
+const render_header = (source) => {
+  let header = "# Changelog";
+
+  let name = source.project?.name;
+
+  const links = {};
+
+  if (source?.project?.homepage) {
+    links.homepage = source?.project?.homepage;
+    name = `[${name}][homepage]`;
+  }
+
+  if (name) header += ` for ${name}`;
+
+  return { header, links };
+};
+
+function render_links(links) {
+  return Object.entries(links)
+    .map(([name, url]) => `    [${name}]: ${url}`)
+    .join("\n");
+}
+
+const render_change = (config, source) => (change) => {
+  let body = change.desc;
+  let links = {};
+
+  return {
+    body,
+    links,
+  };
+};
+
+export const render_release = (config, source) => (release) => {
+  let links = {};
+
+  if (typeof release === "string")
+    return {
+      body: release,
+      links,
+    };
+
+  if (release.version === "NEXT" && !config.next)
+    return {
+      body: "",
+      links,
+    };
+
+  let body = "## " + release.version;
+
+  if (release.date) {
+    body += " " + release.date;
+  }
+
+  body += "\n\n";
+
+  const type_map = Object.fromEntries(
+    source.change_types.flatMap((entry) =>
+      entry.keywords.map((k) => [k, entry])
+    )
+  );
+
+  const changes = release.changes.map((change) =>
+    typeof change === "string" ? { desc: change, type: "" } : change
+  );
+
+  const unknown = R.uniq(
+    changes
+      .map(R.prop("type"))
+      .map((t) => t ?? "")
+      .filter((type) => !type_map[type])
+  );
+
+  if (unknown.length) {
+    throw new Error(
+      "unknown change types encountered: " +
+        unknown.map((t) => `'${t}'`).join(", ")
+    );
+  }
+
+  for (const change_type of source.change_types) {
+    const type_changes = changes.filter(({ type }) =>
+      change_type.keywords.includes(type)
+    );
+
+    if (type_changes.length === 0) continue;
+
+    if (change_type.title) body += "\n" + mkd.h3(change_type.title) + "\n\n";
+
+    for (const c of type_changes) {
+      const res = render_change(config, source)(c);
+      body += mkd.li(res.body, 1) + "\n";
+      links = { ...links, ...res.links };
+    }
+  }
+
+  return { body, links };
+};
+
+const handler = async (config) => {
+  const source = await config.changelog();
+
+  let output = "";
+
+  let { header, links } = render_header(source);
+
+  output += header + "\n\n";
+
+  for (const res of source.releases.map(render_release(config, source))) {
+    output += res.body + "\n\n";
+    links = { ...links, ...res.links };
+  }
+
+  output += "\n\n\n\n" + render_links(links);
+
+  config.consola.raw(output);
 };
 
 export default {
-    command: 'print',
-    desc :  'render the changelog',
+  command: "print",
+  desc: "render the changelog",
   builder: (yargs) => {
-        yargs.boolean('json')
-        .boolean('next')
-        .default('json',false)
-        .default('next',true);
+    yargs
+      //.boolean('json')
+      .boolean("next")
+      //        .default('json',false)
+      .default("next", true);
   },
   handler,
-}
+};

src/command/print.test.js

@@ -0,0 +1,22 @@
+import { test, expect, vi } from 'vitest';
+import { render_release } from './print.js';
+import { base_changelog } from './init.js';
+
+test( 'render_release a string', () => {
+    const {body} = render_release({})("as is");
+    expect(body).toEqual('as is');
+});
+
+test( 'render_release', () => {
+    const consola = { error: vi.fn() };
+    const res= render_release({consola},base_changelog)({
+        version: '1.2.3',
+        date: 'today',
+        changes: [
+            "this",
+            "that",
+        ]
+    });
+    expect(res.body).toContain('# 1.2.3 today');
+    expect(res.body).toContain('* this');
+});

src/command/schema.js

@@ -1,12 +1,9 @@
 import fs from "fs-extra";
+import yaml from "yaml";
+import schemaV1 from "../changelog-schema.js";
 
 const handler = async ({ consola }) => {
-  consola.raw(
-    await fs.readFile(
-      new URL("../changelog-schema.yml", import.meta.url),
-      "utf-8"
-    )
-  );
+  consola.raw(yaml.stringify(schemaV1));
 };
 
 export default {

src/command/upcoming.js

@@ -0,0 +1,31 @@
+import u from "@yanick/updeep-remeda";
+import fs from "fs-extra";
+import yaml from "yaml";
+import { render_release } from "./print.js";
+
+export async function next_release() {
+  const source = await this.changelog();
+  return (
+    source.releases.find(u.matches({ version: "NEXT" })) ?? {
+      version: "NEXT",
+      changes: [],
+    }
+  );
+}
+
+const handler = async (config) => {
+  const source = await config.changelog();
+
+  const { body } = render_release(
+    { ...config, next: true },
+    source
+  )(await config.next_release());
+
+  config.consola.raw("\n" + body);
+};
+
+export default {
+  command: "upcoming",
+  desc: "output the changes in NEXT",
+  handler,
+};

src/command/upcoming.test.js

@@ -0,0 +1,29 @@
+import { test, expect, vi } from "vitest";
+import upcoming from "./upcoming.js";
+
+test("basic", async () => {
+  const changelog = {
+    releases: [{ version: "NEXT", changes: [] }, { version: "1.0.0" }],
+    change_types: [],
+  };
+
+  const noop = () => {};
+  const config = {
+    consola: {
+      start: noop,
+      raw: vi.fn(),
+    },
+    changelog: () => changelog,
+    next_release: () => ({
+      changes: [],
+    }),
+    latest_version: () => ({ version: "1.2.3" }),
+    git: () => ({
+      log: () => ({ all: [] }),
+    }),
+  };
+
+  await upcoming.handler(config);
+
+  expect(config.consola.raw).toHaveBeenCalled();
+});

src/command/validate.js

@@ -0,0 +1,16 @@
+const handler = async (config) => {
+  config.consola.start("validating changelog...");
+
+  try {
+    await config.changelog();
+    config.consola.success("valid!");
+  } catch (e) {
+    config.yargs.exit(1, "changelog is invalid :-(");
+  }
+};
+
+export default {
+  command: "validate",
+  desc: "validate the changelog against its json schema",
+  handler,
+};

src/command/validate.test.js

@@ -0,0 +1,16 @@
+import { test, expect, vi } from "vitest";
+import validate from "./validate.js";
+
+test("basic", async () => {
+  const success = vi.fn();
+  const noop = () => true;
+  await validate.handler({
+    changelog: () => ({}),
+    consola: {
+      start: noop,
+      success,
+    },
+  });
+
+  expect(success).toHaveBeenCalled();
+});

src/utils.js

@@ -0,0 +1,6 @@
+export const base_next_version = {
+  version: "NEXT",
+  changes: [],
+};
+
+Object.freeze(base_next_version);