feat: add conventional changelog generate function

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.0.1-rc2 (2019-05-30)
+## [0.0.1-rc2](https://github.com/sifrr/sifrr-dev/compare/72d3a3c...v0.0.1-rc2) (2019-05-30 10:39:49 +0000)
 
 
 ### Bug Fixes
@@ -14,4 +14,3 @@
 
 
 
-

rollup.config.js

@@ -19,7 +19,8 @@ function moduleConfig(name, root, minify = false, isModule = false) {
     external: id => {
       const packages = [
         'fs',
-        'path'
+        'path',
+        'conventional-changelog'
       ];
       if (packages.indexOf(id) > -1) return true;
       return /rollup-plugin/.test(id);

src/generatechangelog.js

@@ -0,0 +1,53 @@
+const fs = require('fs');
+const path = require('path');
+const conventionalChangelog = require('conventional-changelog');
+const rtag = /tag:\s*[v=]?(.+?)[,)]/gi;
+
+module.exports = ({
+  folder = process.cwd(),
+  releaseCount = 0,
+  changelogFile = path.join(folder, './CHANGELOG.md'),
+  outputUnreleased = false,
+  multiRepo = false
+} = {}) => {
+  let oldChangelog = '';
+  const transform = function(cm, cb) {
+    let match = rtag.exec(cm.gitTags);
+    rtag.lastIndex = 0;
+    if (match) cm.version = match[1];
+    cb(null, cm);
+  };
+  const options = {
+    pkg: {
+      path: path.join(folder, './package.json'),
+    },
+    preset: 'angular',
+    releaseCount,
+    outputUnreleased,
+    gitRawCommitsOpts: {
+      path: folder
+    },
+    transform
+  };
+
+  if (fs.existsSync(changelogFile)) {
+    if (releaseCount === 0) fs.writeFileSync(changelogFile, '');
+    oldChangelog = fs.readFileSync(changelogFile, 'utf-8');
+  }
+  if (multiRepo) {
+    options.transform = (cm, cb) => {
+      if (cm.scope && cm.scope === multiRepo) cm.scope = null;
+      else cm.type = 'chore';
+      transform(cm, cb);
+    };
+  }
+  return new Promise((res, rej) => {
+    conventionalChangelog(options)
+      .pipe(fs.createWriteStream(changelogFile))
+      .on('error', rej)
+      .on('finish', () => {
+        fs.appendFileSync(changelogFile, oldChangelog);
+        res(changelogFile);
+      });
+  });
+};

src/sifrr.dev.js

@@ -2,5 +2,6 @@ module.exports = {
   eslintrc: require('./eslintrc'),
   loadDir: require('./loaddir'),
   deepMerge: require('./deepmerge'),
-  getRollupConfig: require('./getrollupconfig')
+  getRollupConfig: require('./getrollupconfig'),
+  generateChangelog: require('./generatechangelog')
 };