diff --git a/README.md b/README.md
index 106b471a..e84497e3 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,7 @@ For more scenarios see [examples](#examples) section.
 
 ## What's New
 
+- Add `stat` parameter that enables output of the file changes statistics per filter.
 - Add `ref` input parameter
 - Add `list-files: csv` format
 - Configure matrix job to run for each folder with changes using `changes` output
@@ -160,6 +161,7 @@ For more information, see [CHANGELOG](https://github.com/dorny/paths-filter/blob
 - For each filter, it sets an output variable with the name `${FILTER_NAME}_count` to the count of matching files.
 - If enabled, for each filter it sets an output variable with the name `${FILTER_NAME}_files`. It will contain a list of all files matching the filter.
 - `changes` - JSON array with names of all filters matching any of the changed files.
+- If `stat` input is set to an output format, the output variable `stat` contains JSON or CSV value with the change statistics for each filter.
 
 ## Examples
 
@@ -504,6 +506,33 @@ jobs:
 
 </details>
 
+<details>
+  <summary>Passing number of added lines from a filter to another action</summary>
+
+```yaml
+- uses: dorny/paths-filter@v2
+  id: filter
+  with:
+    # Enable listing of diff stat matching each filter.
+    # Paths to files will be available in `stat` output variable.
+    # Stat will be formatted as JSON object
+    stat: json
+
+    # In this example all changed files are passed to the following action to do
+    # some custom processing.
+    filters: |
+      changed:
+        - '**'
+- name: Lint Markdown
+  uses: johndoe/some-action@v1
+  # Run action only if the change is large enough.
+  if: ${{fromJson(steps.filter.outputs.stat).changed.additionCount > 1000}}
+  with:
+    files: ${{ steps.filter.outputs.changed_files }}
+```
+
+</details>
+
 ## See also
 
 - [test-reporter](https://github.com/dorny/test-reporter) - Displays test results from popular testing frameworks directly in GitHub
diff --git a/__tests__/filter.test.ts b/__tests__/filter.test.ts
index be2a1487..b1f4bbb1 100644
--- a/__tests__/filter.test.ts
+++ b/__tests__/filter.test.ts
@@ -150,7 +150,7 @@ describe('matching specific change status', () => {
       - added: "**/*"
     `
     let filter = new Filter(yaml)
-    const files = [{status: ChangeStatus.Added, filename: 'file.js'}]
+    const files = [{status: ChangeStatus.Added, filename: 'file.js', additions: 1, deletions: 0}]
     const match = filter.match(files)
     expect(match.add).toEqual(files)
   })
@@ -161,7 +161,7 @@ describe('matching specific change status', () => {
       - added|modified: "**/*"
     `
     let filter = new Filter(yaml)
-    const files = [{status: ChangeStatus.Modified, filename: 'file.js'}]
+    const files = [{status: ChangeStatus.Modified, filename: 'file.js', additions: 1, deletions: 1}]
     const match = filter.match(files)
     expect(match.addOrModify).toEqual(files)
   })
@@ -183,6 +183,6 @@ describe('matching specific change status', () => {
 
 function modified(paths: string[]): File[] {
   return paths.map(filename => {
-    return {filename, status: ChangeStatus.Modified}
+    return {filename, status: ChangeStatus.Modified, additions: 1, deletions: 1}
   })
 }
diff --git a/__tests__/git.test.ts b/__tests__/git.test.ts
index 9645221e..d543dce6 100644
--- a/__tests__/git.test.ts
+++ b/__tests__/git.test.ts
@@ -2,8 +2,8 @@ import * as git from '../src/git'
 import {ChangeStatus} from '../src/file'
 
 describe('parsing output of the git diff command', () => {
-  test('parseGitDiffOutput returns files with correct change status', async () => {
-    const files = git.parseGitDiffOutput(
+  test('parseGitDiffNameStatusOutput returns files with correct change status', async () => {
+    const files = git.parseGitDiffNameStatusOutput(
       'A\u0000LICENSE\u0000' + 'M\u0000src/index.ts\u0000' + 'D\u0000src/main.ts\u0000'
     )
     expect(files.length).toBe(3)
@@ -14,6 +14,19 @@ describe('parsing output of the git diff command', () => {
     expect(files[2].filename).toBe('src/main.ts')
     expect(files[2].status).toBe(ChangeStatus.Deleted)
   })
+
+  test('parseGitDiffNumstatOutput returns files with correct change status', async () => {
+    const files = git.parseGitDiffNumstatOutput(
+      '4\t2\tLICENSE\u0000' + '5\t0\tsrc/index.ts\u0000'
+    )
+    expect(files.length).toBe(2)
+    expect(files[0].filename).toBe('LICENSE')
+    expect(files[0].additions).toBe(4)
+    expect(files[0].deletions).toBe(2)
+    expect(files[1].filename).toBe('src/index.ts')
+    expect(files[1].additions).toBe(5)
+    expect(files[1].deletions).toBe(0)
+  })
 })
 
 describe('git utility function tests (those not invoking git)', () => {
diff --git a/action.yml b/action.yml
index dc515281..65128ddc 100644
--- a/action.yml
+++ b/action.yml
@@ -36,6 +36,16 @@ inputs:
                   Backslash escapes every potentially unsafe character.
     required: true
     default: none
+  stat:
+    description: |
+      Enables listing of that enables output of the file change statistics per filter, similar to `git diff --shortstat`.
+      If some changes do not match any filter, the output includes an additional entry with the filter name 'other'.
+        'none'  - Disables listing of stats (default).
+        'csv'   - Coma separated list that has name of filter, count of additions, count of deletions, count of changed files.
+                  If needed it uses double quotes to wrap name of filter with unsafe characters. For example, `"some filter",12,7,2`.
+        'json'  - Serialized as JSON object where the filter names are keys. For example, `{"some filter": {"additionCount": 12, "deletionCount": 7, "fileCount": 2}}`
+    required: false
+    default: none
   initial-fetch-depth:
     description: |
       How many commits are initially fetched from base branch.
diff --git a/dist/index.js b/dist/index.js
index 7f134f10..600b2085 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -3811,54 +3811,39 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.isGitSha = exports.getShortName = exports.getCurrentRef = exports.listAllFilesAsAdded = exports.parseGitDiffOutput = exports.getChangesSinceMergeBase = exports.getChangesOnHead = exports.getChanges = exports.getChangesInLastCommit = exports.HEAD = exports.NULL_SHA = void 0;
+exports.isGitSha = exports.getShortName = exports.getCurrentRef = exports.listAllFilesAsAdded = exports.parseGitDiffNumstatOutput = exports.getGitDiffStatusNumstat = exports.parseGitDiffNameStatusOutput = exports.getChangesSinceMergeBase = exports.getChangesOnHead = exports.getChanges = exports.getChangesInLastCommit = exports.HEAD = exports.NULL_SHA = void 0;
 const exec_1 = __importDefault(__webpack_require__(807));
 const core = __importStar(__webpack_require__(470));
 const file_1 = __webpack_require__(258);
 exports.NULL_SHA = '0000000000000000000000000000000000000000';
 exports.HEAD = 'HEAD';
 async function getChangesInLastCommit() {
-    core.startGroup(`Change detection in last commit`);
-    let output = '';
-    try {
-        output = (await exec_1.default('git', ['log', '--format=', '--no-renames', '--name-status', '-z', '-n', '1'])).stdout;
-    }
-    finally {
-        fixStdOutNullTermination();
-        core.endGroup();
-    }
-    return parseGitDiffOutput(output);
+    return core.group(`Change detection in last commit`, async () => {
+        try {
+            // Calling git log on the last commit works when only the last commit may be checked out. Calling git diff HEAD^..HEAD needs two commits.
+            const statusOutput = (await exec_1.default('git', ['log', '--format=', '--no-renames', '--name-status', '-z', '-n', '1'])).stdout;
+            const numstatOutput = (await exec_1.default('git', ['log', '--format=', '--no-renames', '--numstat', '-z', '-n', '1'])).stdout;
+            const statusFiles = parseGitDiffNameStatusOutput(statusOutput);
+            const numstatFiles = parseGitDiffNumstatOutput(numstatOutput);
+            return mergeStatusNumstat(statusFiles, numstatFiles);
+        }
+        finally {
+            fixStdOutNullTermination();
+        }
+    });
 }
 exports.getChangesInLastCommit = getChangesInLastCommit;
 async function getChanges(base, head) {
     const baseRef = await ensureRefAvailable(base);
     const headRef = await ensureRefAvailable(head);
     // Get differences between ref and HEAD
-    core.startGroup(`Change detection ${base}..${head}`);
-    let output = '';
-    try {
-        // Two dots '..' change detection - directly compares two versions
-        output = (await exec_1.default('git', ['diff', '--no-renames', '--name-status', '-z', `${baseRef}..${headRef}`])).stdout;
-    }
-    finally {
-        fixStdOutNullTermination();
-        core.endGroup();
-    }
-    return parseGitDiffOutput(output);
+    // Two dots '..' change detection - directly compares two versions
+    return core.group(`Change detection ${base}..${head}`, () => getGitDiffStatusNumstat(`${baseRef}..${headRef}`));
 }
 exports.getChanges = getChanges;
 async function getChangesOnHead() {
     // Get current changes - both staged and unstaged
-    core.startGroup(`Change detection on HEAD`);
-    let output = '';
-    try {
-        output = (await exec_1.default('git', ['diff', '--no-renames', '--name-status', '-z', 'HEAD'])).stdout;
-    }
-    finally {
-        fixStdOutNullTermination();
-        core.endGroup();
-    }
-    return parseGitDiffOutput(output);
+    return core.group(`Change detection on HEAD`, () => getGitDiffStatusNumstat(`HEAD`));
 }
 exports.getChangesOnHead = getChangesOnHead;
 async function getChangesSinceMergeBase(base, head, initialFetchDepth) {
@@ -3923,19 +3908,30 @@ async function getChangesSinceMergeBase(base, head, initialFetchDepth) {
         diffArg = `${baseRef}..${headRef}`;
     }
     // Get changes introduced on ref compared to base
-    core.startGroup(`Change detection ${diffArg}`);
+    return getGitDiffStatusNumstat(diffArg);
+}
+exports.getChangesSinceMergeBase = getChangesSinceMergeBase;
+async function gitDiffNameStatus(diffArg) {
     let output = '';
     try {
         output = (await exec_1.default('git', ['diff', '--no-renames', '--name-status', '-z', diffArg])).stdout;
     }
     finally {
         fixStdOutNullTermination();
-        core.endGroup();
     }
-    return parseGitDiffOutput(output);
+    return output;
 }
-exports.getChangesSinceMergeBase = getChangesSinceMergeBase;
-function parseGitDiffOutput(output) {
+async function gitDiffNumstat(diffArg) {
+    let output = '';
+    try {
+        output = (await exec_1.default('git', ['diff', '--no-renames', '--numstat', '-z', diffArg])).stdout;
+    }
+    finally {
+        fixStdOutNullTermination();
+    }
+    return output;
+}
+function parseGitDiffNameStatusOutput(output) {
     const tokens = output.split('\u0000').filter(s => s.length > 0);
     const files = [];
     for (let i = 0; i + 1 < tokens.length; i += 2) {
@@ -3946,24 +3942,44 @@ function parseGitDiffOutput(output) {
     }
     return files;
 }
-exports.parseGitDiffOutput = parseGitDiffOutput;
+exports.parseGitDiffNameStatusOutput = parseGitDiffNameStatusOutput;
+function mergeStatusNumstat(statusEntries, numstatEntries) {
+    const statusMap = {};
+    statusEntries.forEach(f => statusMap[f.filename] = f);
+    return numstatEntries.map(f => {
+        const status = statusMap[f.filename];
+        if (!status) {
+            throw new Error(`Cannot find the status entry for file: ${f.filename}`);
+        }
+        return { ...f, status: status.status };
+    });
+}
+async function getGitDiffStatusNumstat(diffArg) {
+    const statusFiles = await gitDiffNameStatus(diffArg).then(parseGitDiffNameStatusOutput);
+    const numstatFiles = await gitDiffNumstat(diffArg).then(parseGitDiffNumstatOutput);
+    return mergeStatusNumstat(statusFiles, numstatFiles);
+}
+exports.getGitDiffStatusNumstat = getGitDiffStatusNumstat;
+function parseGitDiffNumstatOutput(output) {
+    const rows = output.split('\u0000').filter(s => s.length > 0);
+    return rows.map(row => {
+        const tokens = row.split('\t');
+        // For the binary files set the numbers to zero. This matches the response of Github API.
+        const additions = tokens[0] == '-' ? 0 : Number.parseInt(tokens[0]);
+        const deletions = tokens[1] == '-' ? 0 : Number.parseInt(tokens[1]);
+        return {
+            filename: tokens[2],
+            additions,
+            deletions,
+        };
+    });
+}
+exports.parseGitDiffNumstatOutput = parseGitDiffNumstatOutput;
 async function listAllFilesAsAdded() {
-    core.startGroup('Listing all files tracked by git');
-    let output = '';
-    try {
-        output = (await exec_1.default('git', ['ls-files', '-z'])).stdout;
-    }
-    finally {
-        fixStdOutNullTermination();
-        core.endGroup();
-    }
-    return output
-        .split('\u0000')
-        .filter(s => s.length > 0)
-        .map(path => ({
-        status: file_1.ChangeStatus.Added,
-        filename: path
-    }));
+    return core.group(`Listing all files tracked by git`, async () => {
+        const emptyTreeHash = (await exec_1.default('git', ['hash-object', '-t', 'tree', '/dev/null'])).stdout;
+        return getGitDiffStatusNumstat(emptyTreeHash);
+    });
 }
 exports.listAllFilesAsAdded = listAllFilesAsAdded;
 async function getCurrentRef() {
@@ -4716,17 +4732,22 @@ async function run() {
         const base = core.getInput('base', { required: false });
         const filtersInput = core.getInput('filters', { required: true });
         const filtersYaml = isPathInput(filtersInput) ? getConfigFileContent(filtersInput) : filtersInput;
-        const listFiles = core.getInput('list-files', { required: false }).toLowerCase() || 'none';
+        const listFilesFormat = core.getInput('list-files', { required: false }).toLowerCase() || 'none';
+        const statFormat = core.getInput('stat', { required: false }).toLowerCase() || 'none';
         const initialFetchDepth = parseInt(core.getInput('initial-fetch-depth', { required: false })) || 10;
-        if (!isExportFormat(listFiles)) {
-            core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFiles}'`);
+        if (!isFilesExportFormat(listFilesFormat)) {
+            core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFilesFormat}'`);
+            return;
+        }
+        if (!isStatExportFormat(statFormat)) {
+            core.setFailed(`Input parameter 'stat' is set to invalid value '${statFormat}'`);
             return;
         }
         const filter = new filter_1.Filter(filtersYaml);
         const files = await getChangedFiles(token, base, ref, initialFetchDepth);
         core.info(`Detected ${files.length} changed files`);
         const results = filter.match(files);
-        exportResults(results, listFiles);
+        exportResults(results, listFilesFormat, statFormat);
     }
     catch (error) {
         core.setFailed(error.message);
@@ -4857,12 +4878,16 @@ async function getChangedFilesFromApi(token, prNumber) {
                 if (row.status === file_1.ChangeStatus.Renamed) {
                     files.push({
                         filename: row.filename,
-                        status: file_1.ChangeStatus.Added
+                        status: file_1.ChangeStatus.Added,
+                        additions: row.additions,
+                        deletions: row.deletions,
                     });
                     files.push({
                         // 'previous_filename' for some unknown reason isn't in the type definition or documentation
                         filename: row.previous_filename,
-                        status: file_1.ChangeStatus.Deleted
+                        status: file_1.ChangeStatus.Deleted,
+                        additions: row.additions,
+                        deletions: row.deletions,
                     });
                 }
                 else {
@@ -4870,7 +4895,9 @@ async function getChangedFilesFromApi(token, prNumber) {
                     const status = row.status === 'removed' ? file_1.ChangeStatus.Deleted : row.status;
                     files.push({
                         filename: row.filename,
-                        status
+                        status,
+                        additions: row.additions,
+                        deletions: row.deletions,
                     });
                 }
             }
@@ -4881,12 +4908,13 @@ async function getChangedFilesFromApi(token, prNumber) {
         core.endGroup();
     }
 }
-function exportResults(results, format) {
+function exportResults(results, filesFormat, statFormat) {
     core.info('Results:');
     const changes = [];
+    const changeStats = {};
     for (const [key, files] of Object.entries(results)) {
-        const value = files.length > 0;
-        core.startGroup(`Filter ${key} = ${value}`);
+        const hasMatchingFiles = files.length > 0;
+        core.startGroup(`Filter ${key} = ${hasMatchingFiles}`);
         if (files.length > 0) {
             changes.push(key);
             core.info('Matching files:');
@@ -4897,12 +4925,20 @@ function exportResults(results, format) {
         else {
             core.info('Matching files: none');
         }
-        core.setOutput(key, value);
+        core.setOutput(key, hasMatchingFiles);
         core.setOutput(`${key}_count`, files.length);
-        if (format !== 'none') {
-            const filesValue = serializeExport(files, format);
+        if (filesFormat !== 'none') {
+            const filesValue = serializeExportChangedFiles(files, filesFormat);
             core.setOutput(`${key}_files`, filesValue);
         }
+        const additionCount = files.reduce((sum, f) => sum + f.additions, 0);
+        const deletionCount = files.reduce((sum, f) => sum + f.deletions, 0);
+        core.setOutput(`${key}_addition_count`, additionCount);
+        core.setOutput(`${key}_deletion_count`, deletionCount);
+        core.setOutput(`${key}_change_count`, additionCount + deletionCount);
+        changeStats[key] = {
+            additionCount, deletionCount, fileCount: files.length
+        };
         core.endGroup();
     }
     if (results['changes'] === undefined) {
@@ -4913,8 +4949,12 @@ function exportResults(results, format) {
     else {
         core.info('Cannot set changes output variable - name already used by filter output');
     }
+    if (statFormat !== 'none') {
+        const statValue = serializeExportStat(changeStats, statFormat);
+        core.setOutput(`stat`, statValue);
+    }
 }
-function serializeExport(files, format) {
+function serializeExportChangedFiles(files, format) {
     const fileNames = files.map(file => file.filename);
     switch (format) {
         case 'csv':
@@ -4929,7 +4969,21 @@ function serializeExport(files, format) {
             return '';
     }
 }
-function isExportFormat(value) {
+function serializeExportStat(stat, format) {
+    switch (format) {
+        case 'csv':
+            return Object.keys(stat).sort().map(k => [csv_escape_1.csvEscape(k), stat[k].additionCount, stat[k].deletionCount, stat[k].fileCount]
+                .join(',')).join('\n');
+        case 'json':
+            return JSON.stringify(stat);
+        default:
+            return '';
+    }
+}
+function isFilesExportFormat(value) {
+    return ['none', 'csv', 'shell', 'json', 'escape'].includes(value);
+}
+function isStatExportFormat(value) {
     return ['none', 'csv', 'shell', 'json', 'escape'].includes(value);
 }
 run();
@@ -5171,7 +5225,7 @@ module.exports = require("https");
 /***/ 215:
 /***/ (function(module) {
 
-module.exports = {"_args":[["@octokit/rest@16.43.1","C:\\Users\\Michal\\Workspace\\dorny\\pr-changed-files-filter"]],"_from":"@octokit/rest@16.43.1","_id":"@octokit/rest@16.43.1","_inBundle":false,"_integrity":"sha512-gfFKwRT/wFxq5qlNjnW2dh+qh74XgTQ2B179UX5K1HYCluioWj8Ndbgqw2PVqa1NnVJkGHp2ovMpVn/DImlmkw==","_location":"/@octokit/rest","_phantomChildren":{"@types/node":"14.0.5","deprecation":"2.3.1","once":"1.4.0","os-name":"3.1.0"},"_requested":{"type":"version","registry":true,"raw":"@octokit/rest@16.43.1","name":"@octokit/rest","escapedName":"@octokit%2frest","scope":"@octokit","rawSpec":"16.43.1","saveSpec":null,"fetchSpec":"16.43.1"},"_requiredBy":["/@actions/github"],"_resolved":"https://registry.npmjs.org/@octokit/rest/-/rest-16.43.1.tgz","_spec":"16.43.1","_where":"C:\\Users\\Michal\\Workspace\\dorny\\pr-changed-files-filter","author":{"name":"Gregor Martynus","url":"https://github.com/gr2m"},"bugs":{"url":"https://github.com/octokit/rest.js/issues"},"bundlesize":[{"path":"./dist/octokit-rest.min.js.gz","maxSize":"33 kB"}],"contributors":[{"name":"Mike de Boer","email":"info@mikedeboer.nl"},{"name":"Fabian Jakobs","email":"fabian@c9.io"},{"name":"Joe Gallo","email":"joe@brassafrax.com"},{"name":"Gregor Martynus","url":"https://github.com/gr2m"}],"dependencies":{"@octokit/auth-token":"^2.4.0","@octokit/plugin-paginate-rest":"^1.1.1","@octokit/plugin-request-log":"^1.0.0","@octokit/plugin-rest-endpoint-methods":"2.4.0","@octokit/request":"^5.2.0","@octokit/request-error":"^1.0.2","atob-lite":"^2.0.0","before-after-hook":"^2.0.0","btoa-lite":"^1.0.0","deprecation":"^2.0.0","lodash.get":"^4.4.2","lodash.set":"^4.3.2","lodash.uniq":"^4.5.0","octokit-pagination-methods":"^1.1.0","once":"^1.4.0","universal-user-agent":"^4.0.0"},"description":"GitHub REST API client for Node.js","devDependencies":{"@gimenete/type-writer":"^0.1.3","@octokit/auth":"^1.1.1","@octokit/fixtures-server":"^5.0.6","@octokit/graphql":"^4.2.0","@types/node":"^13.1.0","bundlesize":"^0.18.0","chai":"^4.1.2","compression-webpack-plugin":"^3.1.0","cypress":"^3.0.0","glob":"^7.1.2","http-proxy-agent":"^4.0.0","lodash.camelcase":"^4.3.0","lodash.merge":"^4.6.1","lodash.upperfirst":"^4.3.1","lolex":"^5.1.2","mkdirp":"^1.0.0","mocha":"^7.0.1","mustache":"^4.0.0","nock":"^11.3.3","npm-run-all":"^4.1.2","nyc":"^15.0.0","prettier":"^1.14.2","proxy":"^1.0.0","semantic-release":"^17.0.0","sinon":"^8.0.0","sinon-chai":"^3.0.0","sort-keys":"^4.0.0","string-to-arraybuffer":"^1.0.0","string-to-jsdoc-comment":"^1.0.0","typescript":"^3.3.1","webpack":"^4.0.0","webpack-bundle-analyzer":"^3.0.0","webpack-cli":"^3.0.0"},"files":["index.js","index.d.ts","lib","plugins"],"homepage":"https://github.com/octokit/rest.js#readme","keywords":["octokit","github","rest","api-client"],"license":"MIT","name":"@octokit/rest","nyc":{"ignore":["test"]},"publishConfig":{"access":"public"},"release":{"publish":["@semantic-release/npm",{"path":"@semantic-release/github","assets":["dist/*","!dist/*.map.gz"]}]},"repository":{"type":"git","url":"git+https://github.com/octokit/rest.js.git"},"scripts":{"build":"npm-run-all build:*","build:browser":"npm-run-all build:browser:*","build:browser:development":"webpack --mode development --entry . --output-library=Octokit --output=./dist/octokit-rest.js --profile --json > dist/bundle-stats.json","build:browser:production":"webpack --mode production --entry . --plugin=compression-webpack-plugin --output-library=Octokit --output-path=./dist --output-filename=octokit-rest.min.js --devtool source-map","build:ts":"npm run -s update-endpoints:typescript","coverage":"nyc report --reporter=html && open coverage/index.html","generate-bundle-report":"webpack-bundle-analyzer dist/bundle-stats.json --mode=static --no-open --report dist/bundle-report.html","lint":"prettier --check '{lib,plugins,scripts,test}/**/*.{js,json,ts}' 'docs/*.{js,json}' 'docs/src/**/*' index.js README.md package.json","lint:fix":"prettier --write '{lib,plugins,scripts,test}/**/*.{js,json,ts}' 'docs/*.{js,json}' 'docs/src/**/*' index.js README.md package.json","postvalidate:ts":"tsc --noEmit --target es6 test/typescript-validate.ts","prebuild:browser":"mkdirp dist/","pretest":"npm run -s lint","prevalidate:ts":"npm run -s build:ts","start-fixtures-server":"octokit-fixtures-server","test":"nyc mocha test/mocha-node-setup.js \"test/*/**/*-test.js\"","test:browser":"cypress run --browser chrome","update-endpoints":"npm-run-all update-endpoints:*","update-endpoints:fetch-json":"node scripts/update-endpoints/fetch-json","update-endpoints:typescript":"node scripts/update-endpoints/typescript","validate:ts":"tsc --target es6 --noImplicitAny index.d.ts"},"types":"index.d.ts","version":"16.43.1"};
+module.exports = {"name":"@octokit/rest","version":"16.43.1","publishConfig":{"access":"public"},"description":"GitHub REST API client for Node.js","keywords":["octokit","github","rest","api-client"],"author":"Gregor Martynus (https://github.com/gr2m)","contributors":[{"name":"Mike de Boer","email":"info@mikedeboer.nl"},{"name":"Fabian Jakobs","email":"fabian@c9.io"},{"name":"Joe Gallo","email":"joe@brassafrax.com"},{"name":"Gregor Martynus","url":"https://github.com/gr2m"}],"repository":"https://github.com/octokit/rest.js","dependencies":{"@octokit/auth-token":"^2.4.0","@octokit/plugin-paginate-rest":"^1.1.1","@octokit/plugin-request-log":"^1.0.0","@octokit/plugin-rest-endpoint-methods":"2.4.0","@octokit/request":"^5.2.0","@octokit/request-error":"^1.0.2","atob-lite":"^2.0.0","before-after-hook":"^2.0.0","btoa-lite":"^1.0.0","deprecation":"^2.0.0","lodash.get":"^4.4.2","lodash.set":"^4.3.2","lodash.uniq":"^4.5.0","octokit-pagination-methods":"^1.1.0","once":"^1.4.0","universal-user-agent":"^4.0.0"},"devDependencies":{"@gimenete/type-writer":"^0.1.3","@octokit/auth":"^1.1.1","@octokit/fixtures-server":"^5.0.6","@octokit/graphql":"^4.2.0","@types/node":"^13.1.0","bundlesize":"^0.18.0","chai":"^4.1.2","compression-webpack-plugin":"^3.1.0","cypress":"^3.0.0","glob":"^7.1.2","http-proxy-agent":"^4.0.0","lodash.camelcase":"^4.3.0","lodash.merge":"^4.6.1","lodash.upperfirst":"^4.3.1","lolex":"^5.1.2","mkdirp":"^1.0.0","mocha":"^7.0.1","mustache":"^4.0.0","nock":"^11.3.3","npm-run-all":"^4.1.2","nyc":"^15.0.0","prettier":"^1.14.2","proxy":"^1.0.0","semantic-release":"^17.0.0","sinon":"^8.0.0","sinon-chai":"^3.0.0","sort-keys":"^4.0.0","string-to-arraybuffer":"^1.0.0","string-to-jsdoc-comment":"^1.0.0","typescript":"^3.3.1","webpack":"^4.0.0","webpack-bundle-analyzer":"^3.0.0","webpack-cli":"^3.0.0"},"types":"index.d.ts","scripts":{"coverage":"nyc report --reporter=html && open coverage/index.html","lint":"prettier --check '{lib,plugins,scripts,test}/**/*.{js,json,ts}' 'docs/*.{js,json}' 'docs/src/**/*' index.js README.md package.json","lint:fix":"prettier --write '{lib,plugins,scripts,test}/**/*.{js,json,ts}' 'docs/*.{js,json}' 'docs/src/**/*' index.js README.md package.json","pretest":"npm run -s lint","test":"nyc mocha test/mocha-node-setup.js \"test/*/**/*-test.js\"","test:browser":"cypress run --browser chrome","build":"npm-run-all build:*","build:ts":"npm run -s update-endpoints:typescript","prebuild:browser":"mkdirp dist/","build:browser":"npm-run-all build:browser:*","build:browser:development":"webpack --mode development --entry . --output-library=Octokit --output=./dist/octokit-rest.js --profile --json > dist/bundle-stats.json","build:browser:production":"webpack --mode production --entry . --plugin=compression-webpack-plugin --output-library=Octokit --output-path=./dist --output-filename=octokit-rest.min.js --devtool source-map","generate-bundle-report":"webpack-bundle-analyzer dist/bundle-stats.json --mode=static --no-open --report dist/bundle-report.html","update-endpoints":"npm-run-all update-endpoints:*","update-endpoints:fetch-json":"node scripts/update-endpoints/fetch-json","update-endpoints:typescript":"node scripts/update-endpoints/typescript","prevalidate:ts":"npm run -s build:ts","validate:ts":"tsc --target es6 --noImplicitAny index.d.ts","postvalidate:ts":"tsc --noEmit --target es6 test/typescript-validate.ts","start-fixtures-server":"octokit-fixtures-server"},"license":"MIT","files":["index.js","index.d.ts","lib","plugins"],"nyc":{"ignore":["test"]},"release":{"publish":["@semantic-release/npm",{"path":"@semantic-release/github","assets":["dist/*","!dist/*.map.gz"]}]},"bundlesize":[{"path":"./dist/octokit-rest.min.js.gz","maxSize":"33 kB"}]};
 
 /***/ }),
 
@@ -5351,6 +5405,11 @@ class Filter {
         for (const [key, patterns] of Object.entries(this.rules)) {
             result[key] = files.filter(file => this.isMatch(file, patterns));
         }
+        if (!this.rules.hasOwnProperty('other')) {
+            const matchingFilenamesList = Object.values(result).flatMap(filteredFiles => filteredFiles.map(file => file.filename));
+            const matchingFilenamesSet = new Set(matchingFilenamesList);
+            result.other = files.filter(file => !matchingFilenamesSet.has(file.filename));
+        }
         return result;
     }
     isMatch(file, patterns) {
diff --git a/src/file.ts b/src/file.ts
index d8125a7a..b5d3ea27 100644
--- a/src/file.ts
+++ b/src/file.ts
@@ -1,8 +1,16 @@
-export interface File {
+export interface FileStatus {
   filename: string
   status: ChangeStatus
 }
 
+export interface FileNumstat {
+  filename: string
+  additions: number
+  deletions: number
+}
+
+export type File = FileStatus & FileNumstat
+
 export enum ChangeStatus {
   Added = 'added',
   Copied = 'copied',
diff --git a/src/filter.ts b/src/filter.ts
index cfc74a3c..125fb0b4 100644
--- a/src/filter.ts
+++ b/src/filter.ts
@@ -1,6 +1,6 @@
 import * as jsyaml from 'js-yaml'
 import picomatch from 'picomatch'
-import {File, ChangeStatus} from './file'
+import {File, ChangeStatus, FileStatus} from './file'
 
 // Type definition of object we expect to load from YAML
 interface FilterYaml {
@@ -58,10 +58,17 @@ export class Filter {
     for (const [key, patterns] of Object.entries(this.rules)) {
       result[key] = files.filter(file => this.isMatch(file, patterns))
     }
+
+    if (!this.rules.hasOwnProperty('other')) {
+      const matchingFilenamesList = Object.values(result).flatMap(filteredFiles => filteredFiles.map(file => file.filename))
+      const matchingFilenamesSet = new Set(matchingFilenamesList)
+      result.other = files.filter(file => !matchingFilenamesSet.has(file.filename))
+    }
+
     return result
   }
 
-  private isMatch(file: File, patterns: FilterRuleItem[]): boolean {
+  private isMatch(file: FileStatus, patterns: FilterRuleItem[]): boolean {
     return patterns.some(
       rule => (rule.status === undefined || rule.status.includes(file.status)) && rule.isMatch(file.filename)
     )
diff --git a/src/git.ts b/src/git.ts
index 3d6d3be1..ba3acea5 100644
--- a/src/git.ts
+++ b/src/git.ts
@@ -1,21 +1,23 @@
 import exec from './exec'
 import * as core from '@actions/core'
-import {File, ChangeStatus} from './file'
+import {File, ChangeStatus, FileNumstat, FileStatus} from './file'
 
 export const NULL_SHA = '0000000000000000000000000000000000000000'
 export const HEAD = 'HEAD'
 
 export async function getChangesInLastCommit(): Promise<File[]> {
-  core.startGroup(`Change detection in last commit`)
-  let output = ''
-  try {
-    output = (await exec('git', ['log', '--format=', '--no-renames', '--name-status', '-z', '-n', '1'])).stdout
-  } finally {
-    fixStdOutNullTermination()
-    core.endGroup()
-  }
-
-  return parseGitDiffOutput(output)
+  return core.group(`Change detection in last commit`, async () => {
+    try {
+      // Calling git log on the last commit works when only the last commit may be checked out. Calling git diff HEAD^..HEAD needs two commits.
+      const statusOutput = (await exec('git', ['log', '--format=', '--no-renames', '--name-status', '-z', '-n', '1'])).stdout
+      const numstatOutput = (await exec('git', ['log', '--format=', '--no-renames', '--numstat', '-z', '-n', '1'])).stdout
+      const statusFiles = parseGitDiffNameStatusOutput(statusOutput)
+      const numstatFiles = parseGitDiffNumstatOutput(numstatOutput)
+      return mergeStatusNumstat(statusFiles, numstatFiles)
+    } finally {
+      fixStdOutNullTermination()
+    }
+  })
 }
 
 export async function getChanges(base: string, head: string): Promise<File[]> {
@@ -23,31 +25,17 @@ export async function getChanges(base: string, head: string): Promise<File[]> {
   const headRef = await ensureRefAvailable(head)
 
   // Get differences between ref and HEAD
-  core.startGroup(`Change detection ${base}..${head}`)
-  let output = ''
-  try {
-    // Two dots '..' change detection - directly compares two versions
-    output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', `${baseRef}..${headRef}`])).stdout
-  } finally {
-    fixStdOutNullTermination()
-    core.endGroup()
-  }
-
-  return parseGitDiffOutput(output)
+  // Two dots '..' change detection - directly compares two versions
+  return core.group(`Change detection ${base}..${head}`, () =>
+    getGitDiffStatusNumstat(`${baseRef}..${headRef}`)
+  )
 }
 
 export async function getChangesOnHead(): Promise<File[]> {
   // Get current changes - both staged and unstaged
-  core.startGroup(`Change detection on HEAD`)
-  let output = ''
-  try {
-    output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', 'HEAD'])).stdout
-  } finally {
-    fixStdOutNullTermination()
-    core.endGroup()
-  }
-
-  return parseGitDiffOutput(output)
+  return core.group(`Change detection on HEAD`, () =>
+    getGitDiffStatusNumstat(`HEAD`)
+  )
 }
 
 export async function getChangesSinceMergeBase(base: string, head: string, initialFetchDepth: number): Promise<File[]> {
@@ -119,21 +107,32 @@ export async function getChangesSinceMergeBase(base: string, head: string, initi
   }
 
   // Get changes introduced on ref compared to base
-  core.startGroup(`Change detection ${diffArg}`)
+  return getGitDiffStatusNumstat(diffArg)
+}
+
+async function gitDiffNameStatus(diffArg: string): Promise<string> {
   let output = ''
   try {
     output = (await exec('git', ['diff', '--no-renames', '--name-status', '-z', diffArg])).stdout
   } finally {
     fixStdOutNullTermination()
-    core.endGroup()
   }
+  return output
+}
 
-  return parseGitDiffOutput(output)
+async function gitDiffNumstat(diffArg: string): Promise<string> {
+  let output = ''
+  try {
+    output = (await exec('git', ['diff', '--no-renames', '--numstat', '-z', diffArg])).stdout
+  } finally {
+    fixStdOutNullTermination()
+  }
+  return output
 }
 
-export function parseGitDiffOutput(output: string): File[] {
+export function parseGitDiffNameStatusOutput(output: string): FileStatus[] {
   const tokens = output.split('\u0000').filter(s => s.length > 0)
-  const files: File[] = []
+  const files: FileStatus[] = []
   for (let i = 0; i + 1 < tokens.length; i += 2) {
     files.push({
       status: statusMap[tokens[i]],
@@ -143,23 +142,46 @@ export function parseGitDiffOutput(output: string): File[] {
   return files
 }
 
-export async function listAllFilesAsAdded(): Promise<File[]> {
-  core.startGroup('Listing all files tracked by git')
-  let output = ''
-  try {
-    output = (await exec('git', ['ls-files', '-z'])).stdout
-  } finally {
-    fixStdOutNullTermination()
-    core.endGroup()
-  }
+function mergeStatusNumstat(statusEntries: FileStatus[], numstatEntries: FileNumstat[]): File[] {
+  const statusMap: {[key: string]: FileStatus} = {}
+  statusEntries.forEach(f => statusMap[f.filename] = f)
 
-  return output
-    .split('\u0000')
-    .filter(s => s.length > 0)
-    .map(path => ({
-      status: ChangeStatus.Added,
-      filename: path
-    }))
+  return numstatEntries.map(f => {
+    const status = statusMap[f.filename]
+    if (!status) {
+      throw new Error(`Cannot find the status entry for file: ${f.filename}`);
+    }
+    return {...f, status: status.status}
+  })
+}
+
+export async function getGitDiffStatusNumstat(diffArg: string) {
+  const statusFiles = await gitDiffNameStatus(diffArg).then(parseGitDiffNameStatusOutput)
+  const numstatFiles = await gitDiffNumstat(diffArg).then(parseGitDiffNumstatOutput)
+  return mergeStatusNumstat(statusFiles, numstatFiles)
+}
+
+export function parseGitDiffNumstatOutput(output: string): FileNumstat[] {
+  const rows = output.split('\u0000').filter(s => s.length > 0)
+  return rows.map(row => {
+    const tokens = row.split('\t')
+    // For the binary files set the numbers to zero. This matches the response of Github API.
+    const additions = tokens[0] == '-' ? 0 : Number.parseInt(tokens[0])
+    const deletions = tokens[1] == '-' ? 0 : Number.parseInt(tokens[1])
+    return {
+      filename: tokens[2],
+      additions,
+      deletions,
+    }
+  })
+}
+
+
+export async function listAllFilesAsAdded(): Promise<File[]> {
+  return core.group(`Listing all files tracked by git`, async () => {
+    const emptyTreeHash = (await exec('git', ['hash-object', '-t', 'tree', '/dev/null'])).stdout
+    return getGitDiffStatusNumstat(emptyTreeHash)
+  })
 }
 
 export async function getCurrentRef(): Promise<string> {
diff --git a/src/main.ts b/src/main.ts
index d2cb6784..ffc49023 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,7 +9,8 @@ import * as git from './git'
 import {backslashEscape, shellEscape} from './list-format/shell-escape'
 import {csvEscape} from './list-format/csv-escape'
 
-type ExportFormat = 'none' | 'csv' | 'json' | 'shell' | 'escape'
+type FilesExportFormat = 'none' | 'csv' | 'json' | 'shell' | 'escape'
+type StatExportFormat = 'none' | 'csv' | 'json'
 
 async function run(): Promise<void> {
   try {
@@ -23,11 +24,17 @@ async function run(): Promise<void> {
     const base = core.getInput('base', {required: false})
     const filtersInput = core.getInput('filters', {required: true})
     const filtersYaml = isPathInput(filtersInput) ? getConfigFileContent(filtersInput) : filtersInput
-    const listFiles = core.getInput('list-files', {required: false}).toLowerCase() || 'none'
+    const listFilesFormat = core.getInput('list-files', {required: false}).toLowerCase() || 'none'
+    const statFormat = core.getInput('stat', {required: false}).toLowerCase() || 'none'
     const initialFetchDepth = parseInt(core.getInput('initial-fetch-depth', {required: false})) || 10
 
-    if (!isExportFormat(listFiles)) {
-      core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFiles}'`)
+    if (!isFilesExportFormat(listFilesFormat)) {
+      core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFilesFormat}'`)
+      return
+    }
+
+    if (!isStatExportFormat(statFormat)) {
+      core.setFailed(`Input parameter 'stat' is set to invalid value '${statFormat}'`)
       return
     }
 
@@ -35,7 +42,7 @@ async function run(): Promise<void> {
     const files = await getChangedFiles(token, base, ref, initialFetchDepth)
     core.info(`Detected ${files.length} changed files`)
     const results = filter.match(files)
-    exportResults(results, listFiles)
+    exportResults(results, listFilesFormat, statFormat)
   } catch (error) {
     core.setFailed(error.message)
   }
@@ -194,19 +201,25 @@ async function getChangedFilesFromApi(
         if (row.status === ChangeStatus.Renamed) {
           files.push({
             filename: row.filename,
-            status: ChangeStatus.Added
+            status: ChangeStatus.Added,
+            additions: row.additions,
+            deletions: row.deletions,
           })
           files.push({
             // 'previous_filename' for some unknown reason isn't in the type definition or documentation
             filename: (<any>row).previous_filename as string,
-            status: ChangeStatus.Deleted
+            status: ChangeStatus.Deleted,
+            additions: row.additions,
+            deletions: row.deletions,
           })
         } else {
           // Github status and git status variants are same except for deleted files
           const status = row.status === 'removed' ? ChangeStatus.Deleted : (row.status as ChangeStatus)
           files.push({
             filename: row.filename,
-            status
+            status,
+            additions: row.additions,
+            deletions: row.deletions,
           })
         }
       }
@@ -218,12 +231,20 @@ async function getChangedFilesFromApi(
   }
 }
 
-function exportResults(results: FilterResults, format: ExportFormat): void {
+interface Stat {
+  additionCount: number,
+  deletionCount: number,
+  fileCount: number
+}
+
+function exportResults(results: FilterResults, filesFormat: FilesExportFormat, statFormat: StatExportFormat): void {
   core.info('Results:')
-  const changes = []
+  const changes: string[] = []
+  const changeStats: {[key: string]: Stat} = {}
+
   for (const [key, files] of Object.entries(results)) {
-    const value = files.length > 0
-    core.startGroup(`Filter ${key} = ${value}`)
+    const hasMatchingFiles = files.length > 0
+    core.startGroup(`Filter ${key} = ${hasMatchingFiles}`)
     if (files.length > 0) {
       changes.push(key)
       core.info('Matching files:')
@@ -234,12 +255,22 @@ function exportResults(results: FilterResults, format: ExportFormat): void {
       core.info('Matching files: none')
     }
 
-    core.setOutput(key, value)
+    core.setOutput(key, hasMatchingFiles)
     core.setOutput(`${key}_count`, files.length)
-    if (format !== 'none') {
-      const filesValue = serializeExport(files, format)
+    if (filesFormat !== 'none') {
+      const filesValue = serializeExportChangedFiles(files, filesFormat)
       core.setOutput(`${key}_files`, filesValue)
     }
+
+    const additionCount: number = files.reduce((sum, f) => sum + f.additions, 0)
+    const deletionCount: number = files.reduce((sum, f) => sum + f.deletions, 0)
+    core.setOutput(`${key}_addition_count`, additionCount)
+    core.setOutput(`${key}_deletion_count`, deletionCount)
+    core.setOutput(`${key}_change_count`, additionCount + deletionCount)
+    changeStats[key] = {
+      additionCount, deletionCount, fileCount: files.length
+    }
+
     core.endGroup()
   }
 
@@ -250,9 +281,14 @@ function exportResults(results: FilterResults, format: ExportFormat): void {
   } else {
     core.info('Cannot set changes output variable - name already used by filter output')
   }
+
+  if (statFormat !== 'none') {
+    const statValue = serializeExportStat(changeStats, statFormat)
+    core.setOutput(`stat`, statValue)
+  }
 }
 
-function serializeExport(files: File[], format: ExportFormat): string {
+function serializeExportChangedFiles(files: File[], format: FilesExportFormat): string {
   const fileNames = files.map(file => file.filename)
   switch (format) {
     case 'csv':
@@ -268,8 +304,26 @@ function serializeExport(files: File[], format: ExportFormat): string {
   }
 }
 
-function isExportFormat(value: string): value is ExportFormat {
+function serializeExportStat(stat: {[key: string]: Stat}, format: StatExportFormat): string {
+  switch (format) {
+    case 'csv':
+      return Object.keys(stat).sort().map(k =>
+        [csvEscape(k), stat[k].additionCount, stat[k].deletionCount, stat[k].fileCount]
+          .join(',')
+      ).join('\n')
+    case 'json':
+      return JSON.stringify(stat)
+    default:
+      return ''
+  }
+}
+
+function isFilesExportFormat(value: string): value is FilesExportFormat {
   return ['none', 'csv', 'shell', 'json', 'escape'].includes(value)
 }
 
+function isStatExportFormat(value: string): value is StatExportFormat {
+  return ['none', 'csv', 'json'].includes(value)
+}
+
 run()