perf: use git tag --merge <branch> to filter tags present in a branch history

BREAKING CHANGE: Git CLI version 2.7.1 or higher is now required

The `--merge` option of the `git tag` command has been added in Git version 2.7.1 and is now used by semantic-release

lib/branches/get-tags.js

@@ -2,7 +2,7 @@ const {template, escapeRegExp} = require('lodash');
 const semver = require('semver');
 const pReduce = require('p-reduce');
 const debug = require('debug')('semantic-release:get-tags');
-const {getTags, isRefInHistory, getTagHead} = require('../../lib/git');
+const {getTags, getTagHead} = require('../../lib/git');
 
 module.exports = async ({cwd, env, options: {tagFormat}}, branches) => {
   // Generate a regex to parse tags formatted with `tagFormat`
@@ -10,25 +10,18 @@ module.exports = async ({cwd, env, options: {tagFormat}}, branches) => {
   // The `tagFormat` is compiled with space as the `version` as it's an invalid tag character,
   // so it's guaranteed to no be present in the `tagFormat`.
   const tagRegexp = `^${escapeRegExp(template(tagFormat)({version: ' '})).replace(' ', '(.[^@]+)@?(.+)?')}`;
-  const tags = (await getTags({cwd, env}))
-    .map(tag => {
-      const [, version, channel] = tag.match(tagRegexp) || [];
-      return {gitTag: tag, version, channel};
-    })
-    .filter(({version}) => version && semver.valid(semver.clean(version)));
-
-  debug('found tags: %o', tags);
 
   return pReduce(
     branches,
     async (branches, branch) => {
-      const branchTags = await pReduce(
-        tags,
-        async (tags, {gitTag, ...rest}) =>
-          (await isRefInHistory(gitTag, branch.name, {cwd, env}))
-            ? [...tags, {...rest, gitTag, gitHead: await getTagHead(gitTag, {cwd, env})}]
-            : tags,
-        []
+      const branchTags = await Promise.all(
+        (await getTags(branch.name, {cwd, env}))
+          .map(tag => {
+            const [, version, channel] = tag.match(tagRegexp) || [];
+            return {gitTag: tag, version, channel};
+          })
+          .filter(({version}) => version && semver.valid(semver.clean(version)))
+          .map(async ({gitTag, ...rest}) => ({gitTag, gitHead: await getTagHead(gitTag, {cwd, env}), ...rest}))
       );
 
       debug('found tags for branch %s: %o', branch.name, branchTags);