# Visual Studio Code Dev Visual Studio Code is a free, lightweight and powerful code editor for Windows, Mac and Linux, based on Electron/Chromium. It has built-in support for JavaScript, TypeScript and Node.js and a rich extension ecosystem that adds intellisense, debugging, syntax highlighting etc. for many languages (C++, Python, Go, Java). It works without too much setup. Get started [here](https://code.visualstudio.com/docs). It is NOT a full-fledged IDE like Visual Studio. The two are completely separate products. The only commonality with Visual Studio is that both are from Microsoft. Here's what works well: * Editing code works well especially when you get used to the [keyboard shortcuts](https://code.visualstudio.com/docs/customization/keybindings). VS Code is very responsive and can handle even big code bases like Chromium. * Git integration is a blast. Built-in side-by-side view, local commit and even extensions for [history](https://marketplace.visualstudio.com/items?itemName=donjayamanne.githistory) and [blame view](https://marketplace.visualstudio.com/items?itemName=ryu1kn.annotator). * [Debugging](https://code.visualstudio.com/Docs/editor/debugging) works well, even though startup times can be fairly high (~40 seconds with gdb on Linux, much lower on Windows). You can step through code, inspect variables, view call stacks for multiple threads etc. * Opening files and searching solution-wide works well now after having problems in earlier versions. * Building works well. Build tools are easy to integrate. Warnings and errors are displayed on a separate page and you can click to jump to the corresponding line of code. * VSCode Remote, which allows you to edit remotely-hosted code, and even run computationally expensive plugins like vscode-clangd on the remote server/workstation (see the [Remote section](#Remote)). Great for working- from-home. (Googlers: See [go/vscode-remote](http://go/vscode-remote)].) [TOC] ## Updating This Page Please keep this doc up-to-date. VS Code is still in active development and subject to changes. This doc is checked into the Chromium git repo, so if you make changes, read the [documentation guidelines](https://chromium.googlesource.com/chromium/src/+/master/docs/documentation_guidelines.md) and [submit a change list](https://www.chromium.org/developers/contributing-code). All file paths and commands have been tested on Linux. Windows and Mac might require a slightly different setup (e.g. `Ctrl` -> `Cmd`). Please update this page accordingly. ## Setup ### Installation Follow the steps on https://code.visualstudio.com/docs/setup/setup-overview. To run it on Linux, just navigate to `chromium/src` folder and type `code .` in a terminal. The argument to `code` is the base directory of the workspace. VS Code does not require project or solution files. However, it does store workspace settings in a `.vscode` folder in your base directory. ### Fixes for Known Issues #### Git on Windows If you only have the `depot_tools` Git installed on your machine, even though it is in your PATH, VS Code will ignore it as it seems to be looking for `git.exe`. You will have to add the following to your settings in order for the Git integration to work: ```json { "git.path": "C:\\src\\depot_tools\\git.bat" } ``` #### Rendering of underscore on Linux As mentioned in [#35901](https://github.com/Microsoft/vscode/issues/35901), VS Code will not show underscore (`_`) properly on Linux by default. You can work around this issue by forcing another font such as the default `monospace` or changing the font size in your settings: ```json { // If you want to use the default "monospace" font: //"terminal.integrated.fontFamily": "monospace" // If you would rather just increase the size of the font: //"terminal.integrated.fontSize": 15 // If you would rather decrease the size of the font: //"terminal.integrated.fontSize": 13 } ``` ### Useful Extensions Up to now, you have a basic version of VS Code without much language support. Next, we will install some useful extensions. Jump to the extensions window (`Ctrl+Shift+X`) and install these extensions, you will most likely use them every day: * ***C/C++*** - Code formatting, debugging, Intellisense. Enables the use of clang-format (via the `C_Cpp.clang_format_path` setting) and format-on-save (via the `editor.formatOnSave` setting). * ***Python*** - Linting, intellisense, code formatting, refactoring, debugging, snippets. * ***Toggle Header/Source*** - Toggles between .cc and .h with `F4`. The C/C++ extension supports this as well through `Alt+O` but sometimes chooses the wrong file when there are multiple files in the workspace that have the same name. * ***Protobuf support*** - Syntax highlighting for .proto files. * [***Mojom IDL support***](https://github.com/GoogleChromeLabs/mojom-language-support) - Syntax highlighting and a [language server](https://microsoft.github.io/language-server-protocol/) for .mojom files. This isn't available on the VS Code marketplace for now. You need to install it manually. * ***vscode-clangd*** - If you do not plan to use VSCode for debugging, vscode-clangd is a great alternative to C/C++ IntelliSense. It knows about how to compile Chromium, enabling it to provide smarter autocomplete than C/C++ IntelliSense as well as allowing you to jump from functions to their definitions. See [clangd.md](clangd.md) for setup instructions. If you need to debug, enable C/C++ extension but set "C_Cpp: Intelli Sense Engine" to disabled, and restart VSCode. * ***Rewrap*** - Wrap lines at 80 characters with `Alt+Q`. * ***Remote*** - Remotely connect to your workstation through SSH using your laptop. See the [Remote](#Remote) section for more information about how to set this up. The following extensions might be useful for you as well: * ***Annotator*** - Git blame view. * ***Git History (git log)*** - Git history view. * ***chromium-codesearch*** - Mac and Linux only: adds ability to open the current line in [Chromium Code Search](https://cs.chromium.org/). All other functionality is deprecated, so currently only of limited usefulness. * ***change-case*** - Quickly change the case of the current selection or current word. * ***Instant Markdown*** - Instant markdown (.md) preview in your browser as you type. This document was written with this extension! * ***you-complete-me*** - Alternative autocomplete extension. Can be configured to use a variety of language servers, so helpful if not using clangd for code completion. See [You-Complete-Me extension setup](#You-Complete-Me-extension-setup) for additional setup instructions. Also be sure to take a look at the [VS Code marketplace](https://marketplace.visualstudio.com/VSCode) to check out other useful extensions. ### Color Scheme Press `Ctrl+Shift+P, color, Enter` to pick a color scheme for the editor. There are also tons of [color schemes available for download on the marketplace](https://marketplace.visualstudio.com/search?target=VSCode&category=Themes&sortBy=Downloads). ### Usage Tips * `Ctrl+P` opens a search box to find and open a file. * `F1` or `Ctrl+Shift+P` opens a search box to find a command (e.g. Tasks: Run Task). * `Ctrl+K, Ctrl+S` opens the key bindings editor. * ``Ctrl+` `` toggles the built-in terminal. * `Ctrl+Shift+M` toggles the problems view (linter warnings, compile errors and warnings). You'll swicth a lot between terminal and problem view during compilation. * `Alt+O` switches between the source/header file. * `Ctrl+G` jumps to a line. * `F12` jumps to the definition of the symbol at the cursor (also available on right-click context menu). * `Shift+F12` or `F1, CodeSearchReferences, Return` shows all references of the symbol at the cursor. * `F1, CodeSearchOpen, Return` opens the current file in Code Search. * `Ctrl+D` selects the word at the cursor. Pressing it multiple times multi-selects the next occurrences, so typing in one types in all of them, and `Ctrl+U` deselects the last occurrence. * `Ctrl+K, Z` enters Zen Mode, a fullscreen editing mode with nothing but the current editor visible. * `Ctrl+X` without anything selected cuts the current line. `Ctrl+V` pastes the line. ### Java/Android Support To get Java support in VS Code, you'll need to install the 'Java Extension Pack' extension, but you'll want to immediately uninstall or disable the Maven for Java extension so it stops nagging you as we won't need it. #### Setting up code completion/reference finding/etc. You'll need to generate a placeholder .classpath file and locate it. In order to generate it, right click on any Java source folder in the left panel and choose "Add folder to java source path". Its location will depend on whether you're doing local or remote development. Local path on linux will look something like: `~/.vscode/data/User/workspaceStorage//redhat.java/jdt_ws//.classpath` You might find multiple folders when looking for ``. Choose anything except `jdt.ls-java-project`. If you only see `jdt.ls-java-project`, try using the "Add folder to java source path" option again. If doing remote development, the file will be under `~/.vscode-server/` on your remote machine. You'll need to replace all of the contents of that file with the contents of `tools/android/eclipse/.classpath` (external) or `clank/development/ide/eclipse/.classpath` (generated by gclient runhooks for Chrome developers), and then replace some paths as vscode interprets some paths differently from eclipse. * Replace: `kind="src" path="` with `kind="src" path="_/` * eg. `` * Replace: `kind="lib" path="../src` with `kind="lib" path="_` * eg. `` * Remove all nested paths (or exclude them from their parents). At time of writing: * `third_party/android_protobuf/src/java/src/main/java` * `third_party/junit/src/src/main/java` Also, make sure `export ANDROID_HOME=/usr/local/google/home/{your_ldap}/Android/Sdk` is in the remote machine's `~/.bashrc`. Then restart vscode, open a Java file, and wait for a bit. Debugging tips: * Right clicking on a folder in vscode and clicking "Add folder to java source path" will error if there are syntax problems with your classpath. (Don't use this actually add new paths to your classpath as it won't work correctly) * If there are no syntax errors, ensure the correct .classpath file is being used by seeing if the folder was actually added to the .classpath file you edited. ## Setup For Chromium VS Code is configured via JSON files. This paragraph contains JSON configuration files that are useful for Chromium development, in particular. See [VS Code documentation](https://code.visualstudio.com/docs/customization/overview) for an introduction to VS Code customization. ### Workspace Settings Open the file [//tools/vscode/settings.json5](/tools/vscode/settings.json5), and check out the default settings there. Feel free to commit added or removed settings to enable better team development, or change settings locally to suit personal preference. Remember to replace ``! To use these settings wholesale, enter the following commands into your terminal while at the src directory: ``` $ mkdir .vscode/ $ cp tools/vscode/settings.json5 .vscode/settings.json ``` Note: these settings assume that the workspace folder (the root folder displayed in the Explorer tab) is chromium/src. If this is not the case, replace any references to ${workspaceFolder} with the path to chromium/src. ### Tasks Next, we'll tell VS Code how to compile our code and how to read warnings and errors from the build output. Open the file [//tools/vscode/tasks.json5](/tools/vscode/tasks.json5). This will provide 5 tasks to do basic things. You might have to adjust the commands to your situation and needs. To use these settings wholesale, enter the following command into your terminal: ``` $ cp tools/vscode/tasks.json5 .vscode/tasks.json ``` ### Launch Commands Launch commands are the equivalent of `F5` in Visual Studio: They launch some program or a debugger. Optionally, they can run some task defined in `tasks.json`. Launch commands can be run from the debug view (`Ctrl+Shift+D`). Open the file at [//tools/vscode/launch.json5](/tools/vscode/launch.json5) and adjust the example launch commands to your situation and needs (e.g., the value of "type" needs adjustment for Windows). To use these settings wholesale, enter the following command into your terminal: ``` $ cp tools/vscode/launch.json5 .vscode/launch.json ``` ### Key Bindings To edit key bindings, press `Ctrl+K, Ctrl+S`. You'll see the defaults on the left and your overrides on the right stored in the file `keybindings.json`. To change a key binding, copy the corresponding key binding to the right. It's fairly self-explanatory. You can bind any command to a key, even commands specified by extensions like `CodeSearchOpen`. For instance, to bind `CodeSearchOpen` to `F2` to , simply add `{ "key": "F2", "command": "cs.open" },`. Note that the command title `CodeSearchOpen` won't work. You have to get the actual command name from the [package.json file](https://github.com/chaopeng/vscode-chromium-codesearch/blob/master/package.json) of the extension. If you are used to other editors, you can also install your favorite keymap. For instance, to install eclipse keymaps, install the `vscode-eclipse-keybindings` extension. More keymaps can be found [in the marketplace](https://marketplace.visualstudio.com/search?target=vscode&category=Keymaps). Some key bindings that are likely to be useful for you are available at [//tools/vscode/keybindings.json5](/tools/vscode/keybindings.json5). Please take a look and adjust them to your situation and needs. To use these settings wholesale, enter the following command into your terminal: ``` $ cp tools/vscode/keybindings.json5 .vscode/keybindings.json ``` ### Remote VSCode now has a [Remote](https://code.visualstudio.com/docs/remote/remote-overview) framework that allows you to use VSCode on your laptop while your code is hosted elsewhere. This really shines when used in conjunction with the vscode-clangd plugin, which allows clangd to run remotely as well. To get this to run, install the Remote pack extension, and then make sure your ssh config file has your remote connection: `~/.ssh/config`: ``` Host my-connection HostName my-remote-host.corp.company.com ``` VSCode will then list this connection in the 'Remote Explorer' section on the left. To launch VSCode with this connection, click on the '+window' icon next to the listed hostname. It has you choose a folder - use the 'src' folder root. This will open a new VSCode window in 'Remote' mode. ***Now you can install extensions specifically for your remote connection, like vscode-clangd, etc.*** #### Chromebooks For Googlers, [here](http://go/vscode/remote_development_via_web) are Google-specific instructions for setting up remote development on chromebooks without using Crostini. #### Windows & SSH This currently is difficult on Windows because VSCode remote tools assumes 'sshd' is installed, which isn't the case on Windows. If someone figures out how to get vscode remote working on windows with ssh please update this document :) ### Snippets There are some useful snippets provided in [//tools/vscode/cpp.json5](/tools/vscode/cpp.json5). You can either install them in your user profile (path may vary depending on the platform): ``` $ cp tools/vscode/cpp.json5 ~/.config/Code/User/snippets/cpp.json ``` Or install them as project snippets after installing the [Project Snippets](https://marketplace.visualstudio.com/items?itemName=rebornix.project-snippets) extension: ``` $ cp tools/vscode/cpp.json5 .vscode/snippets/cpp.json ``` ### Tips #### The `out` folder Automatically generated code is put into a subfolder of out/, which means that these files are ignored by VS Code (see files.exclude above) and cannot be opened e.g. from quick-open (`Ctrl+P`). As of version 1.21, VS Code does not support negated glob commands, but you can define a set of exclude pattern to include only out/Debug/gen: ``` "files.exclude": { // Ignore build output folders. Except out/Debug/gen/ "out/[^D]*/": true, "out/Debug/[^g]*": true, "out/Debug/g[^e]*": true, "out_*/**": true, }, ``` Once it does, you can use ``` "!out/Debug/gen/**": true ``` in files.exclude instead of the symlink. #### Using VS Code as git editor Add `[core] editor = "code --wait"` to your `~/.gitconfig` file in order to use VS Code as editor for git commit messages etc. Note that the editor starts up significantly slower than nano or vim. To use VS Code as merge tool, add `[merge] tool = code`. #### Task Names Note that we named the tasks `1-build_chrome_debug`, `2-build_chrome_release` etc. This allows you to quickly execute tasks by pressing their number: Press `Ctrl+P` and enter `task `, where `` is the number of the task. You can also create a keyboard shortcut for running a task. `File > Preferences > Keyboard Shortcuts` and add `{ "key": "ctrl+r", "command": "workbench.action.tasks.runTask", "when": "!inDebugMode" }`. Then it's sufficient to press `Ctrl+R` and enter ``. #### Working on Laptop Because autocomplete is provided by the You-Complete-Me extension, consider disabling C/C++ autocomplete and indexing to save battery. In addition, you might want to disable git status autorefresh as well. ``` "git.autorefresh": false, "C_Cpp.autocomplete": "Disabled", ``` ### Unable to open $File resource is not available when debugging Chromium on Linux Chromium [recently changed](https://docs.google.com/document/d/1OX4jY_bOCeNK7PNjVRuBQE9s6BQKS8XRNWGK8FEyh-E/edit?usp=sharing) the file path to be relative to the output dir. Check `gn args out/$dir --list` if `strip_absolute_paths_from_debug_symbols` is true (which is the default), set `cwd` to the output dir. otherwise, set `cwd` to `${workspaceRoot}`. ### You-Complete-Me extension setup If using the You-Complete-Me extension, complete its installation by entering these commands in a terminal: ``` $ git clone https://github.com/Valloric/ycmd.git ~/.ycmd $ cd ~/.ycmd $ git submodule update --init --recursive $ ./build.py --clang-completer ``` If it fails with "Your C++ compiler does NOT fully support C++11." but you know you have a good compiler, hack cpp/CMakeLists.txt to set CPP11_AVAILABLE true. On Mac, replace the last command above with the following. ``` $ ./build.py --clang-completer --system-libclang ``` On Windows, if depot_tools' Python is the only one installed, a separate Python 3 install is needed. The last command should then be run as follows. ``` > /python.exe build.py --clang-completer ``` ### More More tips and tricks can be found [here](https://github.com/Microsoft/vscode-tips-and-tricks/blob/master/README.md).