Initial implementation

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.{j,t}s]
+max_line_length = 100
+
+[*.md]
+trim_trailing_whitespace = false

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report
+---
+
+<!-- ⚠️ Please search existing issues to avoid creating duplicates. ⚠️ -->
+<!-- Describe the bug here. -->
+
+## Details
+- Browser and browser and/or electron version: 
+- OS version: 
+- xterm.js version: 
+- xterm-ligature-support version: 
+
+### Steps to reproduce
+
+1. 
+2. 

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature or enhancement
+---
+
+<!-- ⚠️ Please search existing issues to avoid creating duplicates. ⚠️ -->
+<!-- Describe the enhancement here. -->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: The issue tracker is not for questions. Please ask questions on https://stackoverflow.com/questions/tagged/xtermjs or https://gitter.im/sourcelair/xterm.js.
+---
+
+🛑 The issue tracker is not for questions 🛑
+
+If you have a question, please ask it on https://stackoverflow.com/questions/tagged/xtermjs or https://gitter.im/sourcelair/xterm.js.

.gitignore

@@ -1,8 +1,13 @@
-node_modules/
-.nyc_output/
-coverage/
-
-lib/
-
-*.tgz
-npm-debug.log*
+node_modules/
+.nyc_output/
+coverage/
+
+lib/
+fonts/
+
+.env
+.vscode/
+*.swp
+*.tgz
+npm-debug.log*
+yarn-error.log*

.npmignore

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+# Blacklist - exclude everything except npm defaults such as LICENSE, etc
+*
+!*/
+
+# Whitelist - entries to be included must be negated with "!"
+!*.js
+!*.json
+
+# Whitelist - lib/
+!lib/**/*.d.ts
+
+!lib/**/*.js
+!lib/**/*.js.map
+
+# Whitelist - src/
+!src/**/*.ts
+!src/**/*.d.ts
+
+!src/**/*.js
+!src/**/*.js.map
+
+# Blacklist - (normal behavior) these will override any whitelist
+*.test.ts
+*.test.d.ts
+*.test.js
+*.test.js.map
+
+docs/
+/.idea/
+.vscode/
+coverage/
+.nyc_output/
+fonts/

AUTHORS

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+Jeff Principe <princjef@gmail.com>

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance, race,
+religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting [@Tyriar](https://twitter.com/Tyriar) or [@pariskasid](https://twitter.com/pariskasid) on Twitter. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org

CONTRIBUTING.md

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+# How to contribute to xterm-ligature-support
+
+- [Opening issues for bug reports or feature requests](#opening-issues)
+- [Contributing code](#contributing-code)
+
+## Opening issues
+
+The preferred way to report bugs or request features is to use
+[GitHub issues](http://github.com/xtermjs/xterm-ligature-support/issues). Before
+opening an issue, read these pointers.
+
+### Opening issues effectively
+
+- Include information about **the browser in which the problem occurred**. Even
+  if you tested several browsers, and the problem occurred in all of them,
+  mention this fact in the bug report. Also include browser version numbers and
+  the operating system that you're on.
+
+- Mention which release of xterm.js and xterm-ligature-support you're using.
+  Preferably, try also with the current HEAD of the master branch, to ensure the
+  problem has not already been fixed.
+
+- Mention precisely what went wrong. What did you expect to happen? What
+  happened instead? Describe the exact steps a maintainer has to take to make
+  the problem occur.
+
+- Be polite. Issues with an indignant or belligerent tone tend to be moved to
+  the bottom of the pile.
+
+## Contributing code
+
+- Make sure you have a [GitHub account](https://github.com/join)
+- Fork [xterm-ligature-support](https://github.com/xtermjs/xterm-ligature-support/)
+  ([how to fork a repo](https://help.github.com/articles/fork-a-repo))
+- Make your changes
+- If your changes are easy to test or likely to regress, add tests. Tests go into corresponding `.test.ts` files.
+- Follow the general code style of the rest of the project (see below).
+- Submit a pull request
+([how to create a pull request](https://help.github.com/articles/fork-a-repo)).
+  Don't put more than one feature/fix in a single pull request.
+
+By contributing code to xterm-ligature-support you
+
+ - agree to license the contributed code under xterm-ligature-support's [MIT
+   license](LICENSE).
+
+ - confirm that you have the right to contribute and license the code
+   in question. (Either you hold all rights on the code, or the rights
+   holder has explicitly granted the right to use it like this,
+   through a compatible open source license or through a direct
+   agreement with you.)

README.md

@@ -1 +1,95 @@
-# xterm-ligature-support
+# xterm-ligature-support
+
+Add support for programming ligatures to [xterm.js][] when running in
+environments with access to [Node.js][] APIs (such as [Electron][]).
+
+## Requirements
+
+ * [Node.js][] 8.x or higher (present in [Electron][] 1.8.3 or higher)
+ * [xterm.js][] 3.6.0 or higher using the default canvas renderer
+
+## Usage
+
+Install in your project by running:
+
+```
+npm install xterm-ligature-support
+```
+
+Then, modify the location where you initialize the terminal to enable ligature
+support after opening. If you enable ligatures prior to opening the terminal,
+they will not function properly.
+
+Your code should look something like this:
+
+```js
+import { Terminal } from 'xterm';
+import * as ligatures from 'xterm-ligature-support';
+
+Terminal.applyAddon(ligatures);
+
+const terminal = new Terminal();
+terminal.open(document.getElementById('terminal-mount'));
+terminal.enableLigatures();
+```
+
+### Importing in TypeScript
+
+If you use TypeScript, you will need to cast the terminal variable as `any` when
+you enable ligatures because TypeScript does not know that the addon is
+available on the terminal object. It will look like this:
+
+```ts
+(terminal as any).enableLigatures()
+```
+
+Alternatively, you can import the addon directly as a function and pass the
+terminal as an argument:
+
+```js
+import { Terminal } from 'xterm';
+import { enableLigatures } from 'xterm-ligature-support';
+
+const terminal = new Terminal();
+terminal.open(document.getElementById('terminal-mount'));
+enableLigatures(terminal);
+```
+
+## How It Works
+
+In a browser environment, font ligature information is read directly by the web
+browser and used to render text correctly without any intervention from the
+developer. As of version 3, xterm.js uses the canvas to render characters
+individually, resulting in a significant performance boost. However, this means
+that it can no longer lean on the browser to determine when to draw font
+ligatures.
+
+This package locates the font file on disk for the font currently in use by the
+terminal and parses the ligature information out of it (via the
+[font-ligatures][] package). As text is rendered in xterm.js, this package
+annotates it with the locations of ligatures, allowing xterm.js to render it
+correctly.
+
+Since this package depends on being able to find and resolve a system font from
+disk, it has to have system access that isn't available in the web browser. As a
+result, this package is mainly useful in environments that combine browser and
+Node.js runtimes (such as [Electron][]).
+
+## Fonts
+
+This package makes use of the following fonts for testing:
+
+ * [Fira Code][] - [Licensed under the OFL][Fira Code License] by Nikita
+   Prokopov, Mozilla Foundation with reserved names Fira Code, Fira Mono, and
+   Fira Sans
+ * [Iosevka][] - [Licensed under the OFL][Iosevka License] by Belleve Invis with
+   reserved name Iosevka
+
+[xterm.js]: https://github.com/xtermjs/xterm.js
+[Electron]: https://electronjs.org/
+[Node.js]: https://nodejs.org/
+[font-ligatures]: https://github.com/princjef/font-ligatures
+[Fira Code]: https://github.com/tonsky/FiraCode
+[Fira Code License]: https://github.com/tonsky/FiraCode/blob/master/LICENSE
+[Iosevka]: https://github.com/be5invis/Iosevka
+[Iosevka License]: https://github.com/be5invis/Iosevka/blob/master/LICENSE.md

bin/download-fonts.js

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+const fs = require('fs');
+const path = require('path');
+const util = require('util');
+
+const axios = require('axios').default;
+const mkdirp = require('mkdirp');
+const yauzl = require('yauzl');
+
+const urls = {
+  fira: 'https://github.com/tonsky/FiraCode/raw/master/distr/otf/FiraCode-Regular.otf',
+  iosevka: 'https://github.com/be5invis/Iosevka/releases/download/v1.14.3/01-iosevka-1.14.3.zip'
+};
+
+const writeFile = util.promisify(fs.writeFile);
+const fontsFolder = path.join(__dirname, '../fonts');
+
+async function download() {
+  await mkdirp(fontsFolder);
+
+  console.log('Downloading Fira Code...');
+  await writeFile(
+    path.join(fontsFolder, 'firaCode.otf'),
+    (await axios.get(urls.fira, { responseType: 'arraybuffer' })).data
+  );
+
+  console.log('Downloading Iosevka...');
+  const iosevkaContents = (await axios.get(urls.iosevka, { responseType: 'arraybuffer' })).data;
+  const iosevkaZipfile = await util.promisify(yauzl.fromBuffer)(iosevkaContents);
+  await new Promise((resolve, reject) => {
+    iosevkaZipfile.on('entry', entry => {
+      if (entry.fileName === 'ttf/iosevka-regular.ttf') {
+        iosevkaZipfile.openReadStream(entry, (err, stream) => {
+          if (err) {
+            return reject(err);
+          }
+
+          const writeStream = fs.createWriteStream(path.join(fontsFolder, 'iosevka.ttf'));
+          stream.pipe(writeStream);
+          writeStream.on('close', () => resolve());
+        });
+      }
+    });
+  });
+
+  console.log('Loaded all fonts for testing')
+}
+
+download();
+
+process.on('unhandledRejection', e => {
+  console.error(e);
+  process.exit(1);
+});

definitions.d.ts

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+declare module 'postcss-value-parser';