[update] init project

Author: toxic-johann

.eslintignore

@@ -0,0 +1,6 @@
+node_modules
+lib
+flow
+coverage
+bundle-size
+demo

.eslintrc

@@ -0,0 +1,23 @@
+{
+  "globals": {
+    "process": true
+  },
+  "env": {
+    "browser": true,
+    "commonjs": true,
+    "es6": true,
+    "jest/globals": true
+  },
+  "extends": [
+    "eslint-config-egg"
+  ],
+  "plugins": [
+    "jest"
+  ],
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "valid-jsdoc": "off"
+  }
+}

index.js

@@ -0,0 +1,64 @@
+const shell = require('shelljs');
+const semver = require('semver');
+const { isFunction, isRegExp, isString } = require('toxic-predicate-functions');
+
+class Helper {
+  getPrefix(rawPrefix) {
+    const prefix = isFunction(rawPrefix)
+      ? rawPrefix()
+      : rawPrefix;
+    if (!isRegExp(prefix) && !isString(prefix)) throw new Error(`prefix must be RegExp or String, but not ${typeof prefix}`);
+    return prefix;
+  }
+
+  get semverMap() {
+    const { stdout } = shell.exec('git ls-remote --tags origin', { silent: true });
+    const rawTags = stdout.split(/\n/);
+    const semverMap = rawTags.reduce((map, rawTag) => {
+      if (!/refs\/tags\/(.*)$/.test(rawTag)) return map;
+
+      const tag = rawTag.match(/refs\/tags\/(.*)$/)[1];
+
+      const version = semver.coerce(tag);
+
+      if (!version) return map;
+
+      const [ prefix, suffix ] = tag.split(version);
+
+      map[prefix] = map[prefix] || [];
+
+      map[prefix].push({
+        version,
+        wholeVersion: version + suffix,
+        prefix,
+        tag,
+      });
+
+      return map;
+    }, {});
+
+    Object.values(semverMap).forEach(arr => arr.sort((a, b) => (semver.gt(a.version, b.version) ? 1 : -1)));
+
+    return semverMap;
+  }
+
+  getLatest(rawPrefix, {
+    wholeVersion = false,
+    withPrefix = false,
+    all = false,
+  }) {
+    const prefix = this.getPrefix(rawPrefix);
+
+    const tagsList = this.semverMap[prefix] || [];
+
+    const obj = tagsList[tagsList.length - 1];
+
+    if (wholeVersion) return obj.wholeVersion;
+    else if (withPrefix) return obj.tag;
+    else if (all) return obj;
+
+    return obj.semver;
+  }
+}
+
+module.exports = Helper;