feat(updater): add maven pom.xml file support (#33)

README.md

@@ -4,7 +4,6 @@
 
 > **`Why was it renamed commit-and-tag-version?`**. I didn't want to scope the package or name it `standard-version-fork`, and it was a good opportunity to make the purpose of the tool clearer. I also wanted to distinguish it from the other tool in this organisation, [`absolute-version`](https://github.com/absolute-version/absolute-version-js), which just prints version information for pre-releases. To migrate, you can drop in `commit-and-tag-version` in place of `standard-version`. There are no changes in 9.5.0, other than to add the package.json config key `commit-and-tag-version` (the previous configuration key `standard-version` will still work).
 
-
 A utility for versioning using [semver](https://semver.org/) and CHANGELOG generation powered by [Conventional Commits](https://conventionalcommits.org).
 
 ![ci](https://github.com/absolute-version/commit-and-tag-version/workflows/ci/badge.svg)
@@ -16,10 +15,11 @@ A utility for versioning using [semver](https://semver.org/) and CHANGELOG gener
 _Having problems? Want to contribute? Join us on the [node-tooling community Slack](http://devtoolscommunity.herokuapp.com)_.
 
 - [Commit and Tag Version](#commit-and-tag-version)
-    - [How It Works:](#how-it-works)
-    - [`bumpFiles`, `packageFiles` and `updaters`](#bumpfiles-packagefiles-and-updaters)
-    - [Gradle Support (Java/Kotlin)](#gradle-support-javakotlin)
-    - [.NET Support](#net-support)
+  - [How It Works:](#how-it-works)
+  - [`bumpFiles`, `packageFiles` and `updaters`](#bumpfiles-packagefiles-and-updaters)
+  - [Maven Support (Java/Kotlin)](#maven-support-javakotlin)
+  - [Gradle Support (Java/Kotlin)](#gradle-support-javakotlin)
+  - [.NET Support](#net-support)
   - [Installing `commit-and-tag-version`](#installing-commit-and-tag-version)
     - [As a local `npm run` script](#as-a-local-npm-run-script)
     - [As global `bin`](#as-global-bin)
@@ -52,8 +52,7 @@ _Having problems? Want to contribute? Join us on the [node-tooling community Sla
         - [`writeVersion(contents = string, version: string): string`](#writeversioncontents--string-version-string-string)
   - [License](#license)
 
-
-### How It Works:
+### How It Works
 
 1. Follow the [Conventional Commits Specification](https://conventionalcommits.org) in your repository.
 2. When you're ready to release, run `commit-and-tag-version`.
@@ -81,6 +80,14 @@ By default, `commit-and-tag-version` assumes you're working in a NodeJS based pr
 
 That said, if you find your self asking [How can I use commit-and-tag-version for additional metadata files, languages or version files?](#can-i-use-commit-and-tag-version-for-additional-metadata-files-languages-or-version-files) – these configuration options will help!
 
+### Maven Support (Java/Kotlin)
+
+If you are using Maven, then just point to your `pom.xml` file.
+
+```sh
+commit-and-tag-version --packageFiles pom.xml --bumpFiles pom.xml
+```
+
 ### Gradle Support (Java/Kotlin)
 
 If you are using Gradle, then just point to your `build.gradle` file (or `build.gradle.kts` if using Kotlin DSL).
@@ -93,6 +100,7 @@ commit-and-tag-version --packageFiles build.gradle --bumpFiles build.gradle
 
 If you are using .NET with `.csproj` files.
 This is going to read and update only the `<Version>` tag in the file.
+
 ```sh
 commit-and-tag-version --packageFiles <YOUR-PROJECT-NAME>.csproj --bumpFiles <YOUR-PROJECT-NAME>.csproj
 ```
@@ -146,7 +154,7 @@ You can configure `commit-and-tag-version` either by:
 1. Placing a `commit-and-tag-version` stanza in your `package.json` (assuming
    your project is JavaScript).
 
-   > Note for users who have migrated to 
+   > Note for users who have migrated to
    `commit-and-tag-version` from `standard-version`: the previous package.json configuration key of `standard-version` will still work.
 
 2. Creating a `.versionrc`, `.versionrc.json` or `.versionrc.js`.
@@ -306,7 +314,7 @@ Simply add the following to your package.json to configure lifecycle scripts:
 ```
 
 As an example to change from using GitHub to track your items to using your projects Jira use a
-`postchangelog` script to replace the url fragment containing 'https://github.com/`myproject`/issues/'
+`postchangelog` script to replace the url fragment containing '<https://github.com/`myproject`/issues/>'
 with a link to your Jira - assuming you have already installed [replace](https://www.npmjs.com/package/replace)
 
 ```json

lib/updaters/index.js

@@ -3,6 +3,7 @@ const JSON_BUMP_FILES = require('../../defaults').bumpFiles
 const updatersByType = {
   json: require('./types/json'),
   'plain-text': require('./types/plain-text'),
+  maven: require('./types/maven'),
   gradle: require('./types/gradle'),
   csproj: require('./types/csproj')
 }
@@ -23,6 +24,9 @@ function getUpdaterByFilename (filename) {
   if (PLAIN_TEXT_BUMP_FILES.includes(filename)) {
     return getUpdaterByType('plain-text')
   }
+  if (filename === 'pom.xml') {
+    return getUpdaterByType('maven')
+  }
   if (/build.gradle/.test(filename)) {
     return getUpdaterByType('gradle')
   }

lib/updaters/types/maven.js

@@ -0,0 +1,42 @@
+const jsdom = require('jsdom')
+const serialize = require('w3c-xmlserializer')
+const detectNewline = require('detect-newline')
+const CRLF = '\r\n'
+const LF = '\n'
+
+function pomDocument (contents) {
+  const dom = new jsdom.JSDOM('')
+  const parser = new dom.window.DOMParser()
+  return parser.parseFromString(contents, 'application/xml')
+}
+
+function pomVersionElement (document) {
+  const versionElement = document.querySelector('project > version')
+
+  if (!versionElement) {
+    throw new Error('Failed to read the version field in your pom file - is it present?')
+  }
+
+  return versionElement
+}
+
+module.exports.readVersion = function (contents) {
+  const document = pomDocument(contents)
+  return pomVersionElement(document).textContent
+}
+
+module.exports.writeVersion = function (contents, version) {
+  const newline = detectNewline(contents)
+  const document = pomDocument(contents)
+  const versionElement = pomVersionElement(document)
+
+  versionElement.textContent = version
+
+  const xml = serialize(document)
+
+  if (newline === CRLF) {
+    return xml.replace(/\n/g, CRLF) + CRLF
+  }
+
+  return xml + LF
+}