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new_site/_posts/2024-01-27-code-diff.md

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---
layout: post
title: a post with code diff
date: 2024-01-27 19:22:00
description: this is how you can display code diffs
tags: formatting code
categories: sample-posts
code_diff: true
---
You can display diff code by using the regular markdown syntax:
````markdown
```diff
diff --git a/sample.js b/sample.js
index 0000001..0ddf2ba
--- a/sample.js
+++ b/sample.js
@@ -1 +1 @@
-console.log("Hello World!")
+console.log("Hello from Diff2Html!")
```
````
Which generates:
```diff
diff --git a/sample.js b/sample.js
index 0000001..0ddf2ba
--- a/sample.js
+++ b/sample.js
@@ -1 +1 @@
-console.log("Hello World!")
+console.log("Hello from Diff2Html!")
```
But this is difficult to read, specially if you have a large diff. You can use [diff2html](https://diff2html.xyz/) to display a more readable version of the diff. For this, just use `diff2html` instead of `diff` for the code block language:
````markdown
```diff2html
diff --git a/sample.js b/sample.js
index 0000001..0ddf2ba
--- a/sample.js
+++ b/sample.js
@@ -1 +1 @@
-console.log("Hello World!")
+console.log("Hello from Diff2Html!")
```
````
If we use a longer example, for example [this commit from diff2html](https://github.com/rtfpessoa/diff2html/commit/c2c253d3e3f8b8b267f551e659f72b44ca2ac927), it will generate the following output:
```diff2html
From 2aaae31cc2a37bfff83430c2c914b140bee59b6a Mon Sep 17 00:00:00 2001
From: Rodrigo Fernandes <rtfrodrigo@gmail.com>
Date: Sun, 9 Oct 2016 16:41:54 +0100
Subject: [PATCH 1/2] Initial template override support
---
scripts/hulk.js | 4 ++--
src/diff2html.js | 3 +--
src/file-list-printer.js | 11 ++++++++---
src/hoganjs-utils.js | 29 +++++++++++++++++------------
src/html-printer.js | 6 ++++++
src/line-by-line-printer.js | 6 +++++-
src/side-by-side-printer.js | 6 +++++-
test/file-list-printer-tests.js | 2 +-
test/hogan-cache-tests.js | 18 +++++++++++++++---
test/line-by-line-tests.js | 3 +--
test/side-by-side-printer-tests.js | 3 +--
11 files changed, 62 insertions(+), 29 deletions(-)
diff --git a/scripts/hulk.js b/scripts/hulk.js
index 5a793c18..a4b1a4d5 100755
--- a/scripts/hulk.js
+++ b/scripts/hulk.js
@@ -173,11 +173,11 @@ function namespace(name) {
// write a template foreach file that matches template extension
templates = extractFiles(options.argv.remain)
.map(function(file) {
- var openedFile = fs.readFileSync(file, 'utf-8');
+ var openedFile = fs.readFileSync(file, 'utf-8').trim();
var name;
if (!openedFile) return;
name = namespace(path.basename(file).replace(/\..*$/, ''));
- openedFile = removeByteOrderMark(openedFile.trim());
+ openedFile = removeByteOrderMark(openedFile);
openedFile = wrap(file, name, openedFile);
if (!options.outputdir) return openedFile;
fs.writeFileSync(path.join(options.outputdir, name + '.js')
diff --git a/src/diff2html.js b/src/diff2html.js
index 21b0119e..64e138f5 100644
--- a/src/diff2html.js
+++ b/src/diff2html.js
@@ -7,7 +7,6 @@
(function() {
var diffParser = require('./diff-parser.js').DiffParser;
- var fileLister = require('./file-list-printer.js').FileListPrinter;
var htmlPrinter = require('./html-printer.js').HtmlPrinter;
function Diff2Html() {
@@ -43,7 +42,7 @@
var fileList = '';
if (configOrEmpty.showFiles === true) {
- fileList = fileLister.generateFileList(diffJson, configOrEmpty);
+ fileList = htmlPrinter.generateFileListSummary(diffJson, configOrEmpty);
}
var diffOutput = '';
diff --git a/src/file-list-printer.js b/src/file-list-printer.js
index e408d9b2..1e0a2c61 100644
--- a/src/file-list-printer.js
+++ b/src/file-list-printer.js
@@ -8,11 +8,16 @@
(function() {
var printerUtils = require('./printer-utils.js').PrinterUtils;
- var hoganUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ var hoganUtils;
+
var baseTemplatesPath = 'file-summary';
var iconsBaseTemplatesPath = 'icon';
- function FileListPrinter() {
+ function FileListPrinter(config) {
+ this.config = config;
+
+ var HoganJsUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ hoganUtils = new HoganJsUtils(config);
}
FileListPrinter.prototype.generateFileList = function(diffFiles) {
@@ -38,5 +43,5 @@
});
};
- module.exports.FileListPrinter = new FileListPrinter();
+ module.exports.FileListPrinter = FileListPrinter;
})();
diff --git a/src/hoganjs-utils.js b/src/hoganjs-utils.js
index 9949e5fa..0dda08d7 100644
--- a/src/hoganjs-utils.js
+++ b/src/hoganjs-utils.js
@@ -8,18 +8,19 @@
(function() {
var fs = require('fs');
var path = require('path');
-
var hogan = require('hogan.js');
var hoganTemplates = require('./templates/diff2html-templates.js');
- var templatesPath = path.resolve(__dirname, 'templates');
+ var extraTemplates;
- function HoganJsUtils() {
+ function HoganJsUtils(configuration) {
+ this.config = configuration || {};
+ extraTemplates = this.config.templates || {};
}
- HoganJsUtils.prototype.render = function(namespace, view, params, configuration) {
- var template = this.template(namespace, view, configuration);
+ HoganJsUtils.prototype.render = function(namespace, view, params) {
+ var template = this.template(namespace, view);
if (template) {
return template.render(params);
}
@@ -27,17 +28,16 @@
return null;
};
- HoganJsUtils.prototype.template = function(namespace, view, configuration) {
- var config = configuration || {};
+ HoganJsUtils.prototype.template = function(namespace, view) {
var templateKey = this._templateKey(namespace, view);
- return this._getTemplate(templateKey, config);
+ return this._getTemplate(templateKey);
};
- HoganJsUtils.prototype._getTemplate = function(templateKey, config) {
+ HoganJsUtils.prototype._getTemplate = function(templateKey) {
var template;
- if (!config.noCache) {
+ if (!this.config.noCache) {
template = this._readFromCache(templateKey);
}
@@ -53,6 +53,7 @@
try {
if (fs.readFileSync) {
+ var templatesPath = path.resolve(__dirname, 'templates');
var templatePath = path.join(templatesPath, templateKey);
var templateContent = fs.readFileSync(templatePath + '.mustache', 'utf8');
template = hogan.compile(templateContent);
@@ -66,12 +67,16 @@
};
HoganJsUtils.prototype._readFromCache = function(templateKey) {
- return hoganTemplates[templateKey];
+ return extraTemplates[templateKey] || hoganTemplates[templateKey];
};
HoganJsUtils.prototype._templateKey = function(namespace, view) {
return namespace + '-' + view;
};
- module.exports.HoganJsUtils = new HoganJsUtils();
+ HoganJsUtils.prototype.compile = function(templateStr) {
+ return hogan.compile(templateStr);
+ };
+
+ module.exports.HoganJsUtils = HoganJsUtils;
})();
diff --git a/src/html-printer.js b/src/html-printer.js
index 585d5b66..13f83047 100644
--- a/src/html-printer.js
+++ b/src/html-printer.js
@@ -8,6 +8,7 @@
(function() {
var LineByLinePrinter = require('./line-by-line-printer.js').LineByLinePrinter;
var SideBySidePrinter = require('./side-by-side-printer.js').SideBySidePrinter;
+ var FileListPrinter = require('./file-list-printer.js').FileListPrinter;
function HtmlPrinter() {
}
@@ -22,5 +23,10 @@
return sideBySidePrinter.generateSideBySideJsonHtml(diffFiles);
};
+ HtmlPrinter.prototype.generateFileListSummary = function(diffJson, config) {
+ var fileListPrinter = new FileListPrinter(config);
+ return fileListPrinter.generateFileList(diffJson);
+ };
+
module.exports.HtmlPrinter = new HtmlPrinter();
})();
diff --git a/src/line-by-line-printer.js b/src/line-by-line-printer.js
index b07eb53c..d230bedd 100644
--- a/src/line-by-line-printer.js
+++ b/src/line-by-line-printer.js
@@ -11,7 +11,8 @@
var utils = require('./utils.js').Utils;
var Rematch = require('./rematch.js').Rematch;
- var hoganUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ var hoganUtils;
+
var genericTemplatesPath = 'generic';
var baseTemplatesPath = 'line-by-line';
var iconsBaseTemplatesPath = 'icon';
@@ -19,6 +20,9 @@
function LineByLinePrinter(config) {
this.config = config;
+
+ var HoganJsUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ hoganUtils = new HoganJsUtils(config);
}
LineByLinePrinter.prototype.makeFileDiffHtml = function(file, diffs) {
diff --git a/src/side-by-side-printer.js b/src/side-by-side-printer.js
index bbf1dc8d..5e3033b3 100644
--- a/src/side-by-side-printer.js
+++ b/src/side-by-side-printer.js
@@ -11,7 +11,8 @@
var utils = require('./utils.js').Utils;
var Rematch = require('./rematch.js').Rematch;
- var hoganUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ var hoganUtils;
+
var genericTemplatesPath = 'generic';
var baseTemplatesPath = 'side-by-side';
var iconsBaseTemplatesPath = 'icon';
@@ -26,6 +27,9 @@
function SideBySidePrinter(config) {
this.config = config;
+
+ var HoganJsUtils = require('./hoganjs-utils.js').HoganJsUtils;
+ hoganUtils = new HoganJsUtils(config);
}
SideBySidePrinter.prototype.makeDiffHtml = function(file, diffs) {
diff --git a/test/file-list-printer-tests.js b/test/file-list-printer-tests.js
index a502a46f..60ea3208 100644
--- a/test/file-list-printer-tests.js
+++ b/test/file-list-printer-tests.js
@@ -1,6 +1,6 @@
var assert = require('assert');
-var fileListPrinter = require('../src/file-list-printer.js').FileListPrinter;
+var fileListPrinter = new (require('../src/file-list-printer.js').FileListPrinter)();
describe('FileListPrinter', function() {
describe('generateFileList', function() {
diff --git a/test/hogan-cache-tests.js b/test/hogan-cache-tests.js
index 190bf6f8..3bb754ac 100644
--- a/test/hogan-cache-tests.js
+++ b/test/hogan-cache-tests.js
@@ -1,6 +1,6 @@
var assert = require('assert');
-var HoganJsUtils = require('../src/hoganjs-utils.js').HoganJsUtils;
+var HoganJsUtils = new (require('../src/hoganjs-utils.js').HoganJsUtils)();
var diffParser = require('../src/diff-parser.js').DiffParser;
describe('HoganJsUtils', function() {
@@ -21,16 +21,28 @@ describe('HoganJsUtils', function() {
});
assert.equal(emptyDiffHtml, result);
});
+
it('should render view without cache', function() {
var result = HoganJsUtils.render('generic', 'empty-diff', {
contentClass: 'd2h-code-line',
diffParser: diffParser
}, {noCache: true});
- assert.equal(emptyDiffHtml + '\n', result);
+ assert.equal(emptyDiffHtml, result);
});
+
it('should return null if template is missing', function() {
- var result = HoganJsUtils.render('generic', 'missing-template', {}, {noCache: true});
+ var hoganUtils = new (require('../src/hoganjs-utils.js').HoganJsUtils)({noCache: true});
+ var result = hoganUtils.render('generic', 'missing-template', {});
assert.equal(null, result);
});
+
+ it('should allow templates to be overridden', function() {
+ var emptyDiffTemplate = HoganJsUtils.compile('<p>{{myName}}</p>');
+
+ var config = {templates: {'generic-empty-diff': emptyDiffTemplate}};
+ var hoganUtils = new (require('../src/hoganjs-utils.js').HoganJsUtils)(config);
+ var result = hoganUtils.render('generic', 'empty-diff', {myName: 'Rodrigo Fernandes'});
+ assert.equal('<p>Rodrigo Fernandes</p>', result);
+ });
});
});
diff --git a/test/line-by-line-tests.js b/test/line-by-line-tests.js
index 1cd92073..8869b3df 100644
--- a/test/line-by-line-tests.js
+++ b/test/line-by-line-tests.js
@@ -14,7 +14,7 @@ describe('LineByLinePrinter', function() {
' File without changes\n' +
' </div>\n' +
' </td>\n' +
- '</tr>\n';
+ '</tr>';
assert.equal(expected, fileHtml);
});
@@ -422,7 +422,6 @@ describe('LineByLinePrinter', function() {
' </div>\n' +
' </td>\n' +
'</tr>\n' +
- '\n' +
' </tbody>\n' +
' </table>\n' +
' </div>\n' +
diff --git a/test/side-by-side-printer-tests.js b/test/side-by-side-printer-tests.js
index 76625f8e..771daaa5 100644
--- a/test/side-by-side-printer-tests.js
+++ b/test/side-by-side-printer-tests.js
@@ -14,7 +14,7 @@ describe('SideBySidePrinter', function() {
' File without changes\n' +
' </div>\n' +
' </td>\n' +
- '</tr>\n';
+ '</tr>';
assert.equal(expectedRight, fileHtml.right);
assert.equal(expectedLeft, fileHtml.left);
@@ -324,7 +324,6 @@ describe('SideBySidePrinter', function() {
' </div>\n' +
' </td>\n' +
'</tr>\n' +
- '\n' +
' </tbody>\n' +
' </table>\n' +
' </div>\n' +
From f3cadb96677d0eb82fc2752dc3ffbf35ca9b5bdb Mon Sep 17 00:00:00 2001
From: Rodrigo Fernandes <rtfrodrigo@gmail.com>
Date: Sat, 15 Oct 2016 13:21:22 +0100
Subject: [PATCH 2/2] Allow uncompiled templates
---
README.md | 3 +++
src/hoganjs-utils.js | 7 +++++++
test/hogan-cache-tests.js | 24 +++++++++++++++++++++++-
3 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/README.md b/README.md
index 132c8a28..46909f25 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,9 @@ The HTML output accepts a Javascript object with configuration. Possible options
- `synchronisedScroll`: scroll both panes in side-by-side mode: `true` or `false`, default is `false`
- `matchWordsThreshold`: similarity threshold for word matching, default is 0.25
- `matchingMaxComparisons`: perform at most this much comparisons for line matching a block of changes, default is `2500`
+ - `templates`: object with previously compiled templates to replace parts of the html
+ - `rawTemplates`: object with raw not compiled templates to replace parts of the html
+ > For more information regarding the possible templates look into [src/templates](https://github.com/rtfpessoa/diff2html/tree/master/src/templates)
## Diff2HtmlUI Helper
diff --git a/src/hoganjs-utils.js b/src/hoganjs-utils.js
index 0dda08d7..b2e9c275 100644
--- a/src/hoganjs-utils.js
+++ b/src/hoganjs-utils.js
@@ -17,6 +17,13 @@
function HoganJsUtils(configuration) {
this.config = configuration || {};
extraTemplates = this.config.templates || {};
+
+ var rawTemplates = this.config.rawTemplates || {};
+ for (var templateName in rawTemplates) {
+ if (rawTemplates.hasOwnProperty(templateName)) {
+ if (!extraTemplates[templateName]) extraTemplates[templateName] = this.compile(rawTemplates[templateName]);
+ }
+ }
}
HoganJsUtils.prototype.render = function(namespace, view, params) {
diff --git a/test/hogan-cache-tests.js b/test/hogan-cache-tests.js
index 3bb754ac..a34839c0 100644
--- a/test/hogan-cache-tests.js
+++ b/test/hogan-cache-tests.js
@@ -36,7 +36,7 @@ describe('HoganJsUtils', function() {
assert.equal(null, result);
});
- it('should allow templates to be overridden', function() {
+ it('should allow templates to be overridden with compiled templates', function() {
var emptyDiffTemplate = HoganJsUtils.compile('<p>{{myName}}</p>');
var config = {templates: {'generic-empty-diff': emptyDiffTemplate}};
@@ -44,5 +44,27 @@ describe('HoganJsUtils', function() {
var result = hoganUtils.render('generic', 'empty-diff', {myName: 'Rodrigo Fernandes'});
assert.equal('<p>Rodrigo Fernandes</p>', result);
});
+
+ it('should allow templates to be overridden with uncompiled templates', function() {
+ var emptyDiffTemplate = '<p>{{myName}}</p>';
+
+ var config = {rawTemplates: {'generic-empty-diff': emptyDiffTemplate}};
+ var hoganUtils = new (require('../src/hoganjs-utils.js').HoganJsUtils)(config);
+ var result = hoganUtils.render('generic', 'empty-diff', {myName: 'Rodrigo Fernandes'});
+ assert.equal('<p>Rodrigo Fernandes</p>', result);
+ });
+
+ it('should allow templates to be overridden giving priority to compiled templates', function() {
+ var emptyDiffTemplate = HoganJsUtils.compile('<p>{{myName}}</p>');
+ var emptyDiffTemplateUncompiled = '<p>Not used!</p>';
+
+ var config = {
+ templates: {'generic-empty-diff': emptyDiffTemplate},
+ rawTemplates: {'generic-empty-diff': emptyDiffTemplateUncompiled}
+ };
+ var hoganUtils = new (require('../src/hoganjs-utils.js').HoganJsUtils)(config);
+ var result = hoganUtils.render('generic', 'empty-diff', {myName: 'Rodrigo Fernandes'});
+ assert.equal('<p>Rodrigo Fernandes</p>', result);
+ });
});
});
```
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