From d39e4349e566c1370eced061d008a3bda8f56ebd Mon Sep 17 00:00:00 2001
From: Pete Cook <pete@cookpete.com>
Date: Mon, 14 Jan 2019 15:37:20 +0000
Subject: [PATCH] Add --stdout option

Fixes https://github.com/CookPete/auto-changelog/issues/83
---
 README.md     |  1 +
 src/run.js    | 10 ++++++++--
 src/utils.js  |  2 +-
 test/run.js   |  4 ++++
 test/utils.js |  8 ++++----
 5 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index f0737b6e..a73cc453 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ Options:
       --starting-commit [hash]        # starting commit to use for changelog generation
       --include-branch [branch]       # one or more branches to include commits from, comma separated
       --release-summary               # display tagged commit message body as release summary
+      --stdout                        # output changelog to stdout
   -V, --version                       # output the version number
   -h, --help                          # output usage information
 
diff --git a/src/run.js b/src/run.js
index 926be56c..5fd3b130 100644
--- a/src/run.js
+++ b/src/run.js
@@ -6,7 +6,7 @@ import { fetchRemote } from './remote'
 import { fetchCommits } from './commits'
 import { parseReleases, sortReleases } from './releases'
 import { compileTemplate } from './template'
-import { parseLimit, readJson, writeFile, fileExists, log, formatBytes } from './utils'
+import { parseLimit, readJson, writeFile, fileExists, updateLog, formatBytes } from './utils'
 
 const DEFAULT_OPTIONS = {
   output: 'CHANGELOG.md',
@@ -41,6 +41,7 @@ function getOptions (argv, pkg, dotOptions) {
     .option('--include-branch [branch]', 'one or more branches to include commits from, comma separated', str => str.split(','))
     .option('--release-summary', 'use tagged commit message body as release summary')
     .option('--platform [platform]', 'set platform manually [bitbucket, gitlab, azure]')
+    .option('--stdout', 'output changelog to stdout')
     .version(version)
     .parse(argv)
 
@@ -94,6 +95,7 @@ export default async function run (argv) {
   const pkg = await fileExists(PACKAGE_FILE) && await readJson(PACKAGE_FILE)
   const dotOptions = await fileExists(OPTIONS_DOTFILE) && await readJson(OPTIONS_DOTFILE)
   const options = getOptions(argv, pkg, dotOptions)
+  const log = string => options.stdout ? null : updateLog(string)
   log('Fetching remote…')
   const remote = await fetchRemote(options.remote)
   const commitProgress = bytes => log(`Fetching commits… ${formatBytes(bytes)} loaded`)
@@ -102,7 +104,11 @@ export default async function run (argv) {
   const latestVersion = getLatestVersion(options, pkg, commits)
   const releases = await getReleases(commits, remote, latestVersion, options)
   const changelog = await compileTemplate(options.template, { releases })
-  await writeFile(options.output, changelog)
+  if (options.stdout) {
+    process.stdout.write(changelog)
+  } else {
+    await writeFile(options.output, changelog)
+  }
   const bytes = Buffer.byteLength(changelog, 'utf8')
   log(`${formatBytes(bytes)} written to ${options.output}\n`)
 }
diff --git a/src/utils.js b/src/utils.js
index fef66c54..cefc3e75 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -4,7 +4,7 @@ import { spawn } from 'child_process'
 
 const MONTH_NAMES = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
 
-export function log (string, clearLine = true) {
+export function updateLog (string, clearLine = true) {
   if (clearLine) {
     readline.clearLine(process.stdout)
     readline.cursorTo(process.stdout, 0)
diff --git a/test/run.js b/test/run.js
index b923f982..665688d6 100644
--- a/test/run.js
+++ b/test/run.js
@@ -204,6 +204,10 @@ describe('run', () => {
     return run(['', '', '--latest-version', 'v3.0.0'])
   })
 
+  it('does not error when using stdout option', () => {
+    return run(['', '', '--stdout'])
+  })
+
   it('throws an error when no package found', done => {
     run(['', '', '--package'])
       .then(() => done('Should throw an error'))
diff --git a/test/utils.js b/test/utils.js
index af5da640..97c1568a 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -1,7 +1,7 @@
 import { describe, it } from 'mocha'
 import { expect } from 'chai'
 import {
-  log,
+  updateLog,
   cmd,
   niceDate,
   isLink,
@@ -14,10 +14,10 @@ import {
   __ResetDependency__ as unmock
 } from '../src/utils'
 
-describe('log', () => {
+describe('updateLog', () => {
   it('doesn\'t error', async () => {
-    log('Test', false)
-    log('Test')
+    updateLog('Test', false)
+    updateLog('Test')
   })
 })