From c50a3c86c6c534489bfdd1895a10d30eaf75ef20 Mon Sep 17 00:00:00 2001
From: Paul Hatcherian <1835615+PaulHatch@users.noreply.github.com>
Date: Sat, 25 Jan 2020 11:13:16 -0500
Subject: [PATCH] Add path change detection (MINOR)

---
 action.yml    |   6 ++-
 dist/index.js |  16 ++++++--
 index.js      |  16 ++++++--
 index.test.js | 105 +++++++++++++++++++++++++++++++++++++++++++++-----
 4 files changed, 127 insertions(+), 16 deletions(-)

diff --git a/action.yml b/action.yml
index e4aef50..d2de56c 100644
--- a/action.yml
+++ b/action.yml
@@ -24,7 +24,9 @@ inputs:
     description: "Pattern to use when formatting output version"
     required: true
     default: "${major}.${minor}.${patch}"
-
+  change_path:
+    description: "Path to check for changes. If any changes are detected in the path the 'changed' output will true. Enter multiple paths separated by spaces."
+    required: false
 outputs:
   major:
     description: "Current major number"
@@ -36,6 +38,8 @@ outputs:
     description: "An additional value indicating the number of commits for the current version"
   version:
     description: "The version result, in the format {major}.{minor}.{patch}"
+  changed:
+    description: "Indicates whether there was a change since the last version if change_path was specified. If no change_path was specified this value will always be false."
 runs:
   using: "node12"
   main: "dist/index.js"
diff --git a/dist/index.js b/dist/index.js
index f1cad44..17d266f 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -652,7 +652,7 @@ const cmd = async (command, ...args) => {
   return output;
 };
 
-const setOutput = (major, minor, patch, increment) => {
+const setOutput = (major, minor, patch, increment, changed) => {
   const format = core.getInput('format', { required: true });
   var version = format
     .replace('${major}', major)
@@ -667,6 +667,7 @@ const setOutput = (major, minor, patch, increment) => {
   core.setOutput("minor", minor.toString());
   core.setOutput("patch", patch.toString());
   core.setOutput("increment", increment.toString());
+  core.setOutput("changed", changed.toString());
 };
 
 async function run() {
@@ -679,15 +680,18 @@ async function run() {
     const branch = `${remotePrefix}${core.getInput('branch', { required: true })}`;
     const majorPattern = core.getInput('major_pattern', { required: true });
     const minorPattern = core.getInput('minor_pattern', { required: true });
+    const changePath = core.getInput('change_path') || '';
 
     const releasePattern = `${tagPrefix}*`;
     let major = 0, minor = 0, patch = 0, increment = 0;
+    let changed = true;
+
 
     let lastCommitAll = (await cmd('git', 'rev-list', '-n1', '--all')).trim();
 
     if (lastCommitAll === '') {
       // empty repo
-      setOutput('0', '0', '0', '0');
+      setOutput('0', '0', '0', '0', changed);
       return;
     }
 
@@ -741,6 +745,12 @@ async function run() {
       '--author-date-order',
       root === '' ? branch : `${root}..${branch}`);
 
+    if (changePath !== '') {
+      const changedFiles = await cmd(`git diff --name-only ${root}..${branch} -- ${changePath}`);
+
+      changed = changedFiles.length > 0;
+    }
+
     let history = log
       .trim()
       .split(eol)
@@ -766,7 +776,7 @@ async function run() {
       patch++;
     }
 
-    setOutput(major, minor, patch, increment);
+    setOutput(major, minor, patch, increment, changed);
 
   } catch (error) {
     core.error(error);
diff --git a/index.js b/index.js
index 7e847d7..aeaf804 100644
--- a/index.js
+++ b/index.js
@@ -16,7 +16,7 @@ const cmd = async (command, ...args) => {
   return output;
 };
 
-const setOutput = (major, minor, patch, increment) => {
+const setOutput = (major, minor, patch, increment, changed) => {
   const format = core.getInput('format', { required: true });
   var version = format
     .replace('${major}', major)
@@ -31,6 +31,7 @@ const setOutput = (major, minor, patch, increment) => {
   core.setOutput("minor", minor.toString());
   core.setOutput("patch", patch.toString());
   core.setOutput("increment", increment.toString());
+  core.setOutput("changed", changed.toString());
 };
 
 async function run() {
@@ -43,15 +44,18 @@ async function run() {
     const branch = `${remotePrefix}${core.getInput('branch', { required: true })}`;
     const majorPattern = core.getInput('major_pattern', { required: true });
     const minorPattern = core.getInput('minor_pattern', { required: true });
+    const changePath = core.getInput('change_path') || '';
 
     const releasePattern = `${tagPrefix}*`;
     let major = 0, minor = 0, patch = 0, increment = 0;
+    let changed = true;
+
 
     let lastCommitAll = (await cmd('git', 'rev-list', '-n1', '--all')).trim();
 
     if (lastCommitAll === '') {
       // empty repo
-      setOutput('0', '0', '0', '0');
+      setOutput('0', '0', '0', '0', changed);
       return;
     }
 
@@ -105,6 +109,12 @@ async function run() {
       '--author-date-order',
       root === '' ? branch : `${root}..${branch}`);
 
+    if (changePath !== '') {
+      const changedFiles = await cmd(`git diff --name-only ${root}..${branch} -- ${changePath}`);
+
+      changed = changedFiles.length > 0;
+    }
+
     let history = log
       .trim()
       .split(eol)
@@ -130,7 +140,7 @@ async function run() {
       patch++;
     }
 
-    setOutput(major, minor, patch, increment);
+    setOutput(major, minor, patch, increment, changed);
 
   } catch (error) {
     core.error(error);
diff --git a/index.test.js b/index.test.js
index 533cbd2..4a76925 100644
--- a/index.test.js
+++ b/index.test.js
@@ -14,15 +14,15 @@ const createTestRepo = (inputs) => {
     const repoDirectory = `/tmp/test${Math.random().toString(36).substring(2, 15)}`;
     cp.execSync(`mkdir ${repoDirectory} && git init ${repoDirectory}`);
 
-    let env = {};
-    if (inputs !== undefined) {
-        for (let key in inputs) {
-            env[`INPUT_${key.toUpperCase()}`] = inputs[key];
+    const run = (command, extraInputs) => {
+        const allInputs = Object.assign({}, inputs, extraInputs);
+        let env = {};
+        for (let key in allInputs) {
+            env[`INPUT_${key.toUpperCase()}`] = allInputs[key];
         }
+        return execute(repoDirectory, command, env);
     }
 
-    const run = (command) => execute(repoDirectory, command, env);
-
     // Configure up git user
     run(`git config user.name "Test User"`);
     run(`git config user.email "test@example.com"`);
@@ -31,12 +31,12 @@ const createTestRepo = (inputs) => {
 
     return {
         clean: () => execute('/tmp', `rm -rf ${repoDirectory}`),
-        makeCommit: (msg) => {
-            run(`touch test${i++}`);
+        makeCommit: (msg, path) => {
+            run(`touch ${path !== undefined ? path.trim('/') + '/' : ''}test${i++}`);
             run(`git add --all`);
             run(`git commit -m '${msg}'`);
         },
-        runAction: () => run(`node ${path.join(__dirname, 'index.js')}`),
+        runAction: (inputs) => run(`node ${path.join(__dirname, 'index.js')}`, inputs),
         exec: run
     };
 };
@@ -283,5 +283,92 @@ test('Tag order comes from commit order, not tag create order', () => {
 
     expect(result).toMatch('Version is 2.0.1+0');
 
+    repo.clean();
+});
+
+
+test('Change detection is true by default', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.makeCommit(`Second Commit`); // 0.0.2
+    const result = repo.runAction();
+
+    expect(result).toMatch('::set-output name=changed,::true');
+
+    repo.clean();
+});
+
+test('Change detection is true by default', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.makeCommit(`Second Commit`); // 0.0.2
+    const result = repo.runAction({});
+
+    expect(result).toMatch('::set-output name=changed,::true');
+
+    repo.clean();
+});
+
+test('Changes to monitored path is true when change is in path', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.exec('mkdir project1');
+    repo.makeCommit(`Second Commit`, 'project1'); // 0.0.2
+    const result = repo.runAction({ change_path: "project1" });
+
+    expect(result).toMatch('::set-output name=changed,::true');
+
+    repo.clean();
+});
+
+test('Changes to monitored path is false when changes are not in path', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.exec('mkdir project1');
+    repo.exec('mkdir project2');
+    repo.makeCommit(`Second Commit`, 'project2'); // 0.0.2
+    const result = repo.runAction({ change_path: "project1" });
+
+    expect(result).toMatch('::set-output name=changed,::false');
+
+    repo.clean();
+});
+
+test('Changes to multiple monitored path is true when change is in path', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.exec('mkdir project1');
+    repo.exec('mkdir project2');
+    repo.makeCommit(`Second Commit`, 'project2'); // 0.0.2
+    const result = repo.runAction({ change_path: "./project1 ./project2" });
+
+    expect(result).toMatch('::set-output name=changed,::true');
+
+    repo.clean();
+});
+
+test('Changes to multiple monitored path is false when change is not in path', () => {
+    const repo = createTestRepo({ tag_prefix: '' }); // 0.0.0
+
+    repo.makeCommit('Initial Commit'); // 0.0.1
+    repo.exec('git tag 0.0.1');
+    repo.exec('mkdir project1');
+    repo.exec('mkdir project2');
+    repo.exec('mkdir project3');
+    repo.makeCommit(`Second Commit`, 'project3'); // 0.0.2
+    const result = repo.runAction({ change_path: "project1 project2" });
+
+    expect(result).toMatch('::set-output name=changed,::false');
+
     repo.clean();
 });
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