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This makes them a bit easier to find, and also stops them cluttering up the main documentation.
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Visual Studio Code Project Configuration
Visual Studio Code requires some configuration files, and a tailored settings.json file to understand ladybird.
The WSL Remote extension allows you to use VS Code in Windows while using the normal WSL workflow. This works well, but for code comprehension speed you should put the ladybird directory on your WSL root partition.
The recommended extensions for VS Code include:
Configuration
Run ./Meta/ladybird.sh build at least once to kick off downloading and building vcpkg dependencies.
The CMake Tools plugin should automatically detect the CMakePresets.json at the root of the repository.
Selecting and activating the default preset should be enough to get started after the initial build.
You can also use the Debug preset to build with debug symbols, or the Sanitizer preset to build with ASAN/UBSAN.
For additional settings recommendations, see the Settings section below.
Code comprehension
Clangd has the best support for modern compilers, especially if configured as noted below. The Microsoft C/C++ tools can work, but may require more configuration.
clangd
The official clangd extension can be used for C++ comprehension. It is recommended in general, as it is most likely to work on all platforms.
clangd uses compile_commands.json files to understand the project. CMake will generate these in Build/ladybird.
Run ./Meta/ladybird.sh run ladybird at least once to generate the compile_commands.json file.
Known issues
- clangd has a tendency to crash when stressing bleeding edge compiler features. You can usually just restart it via the command palette. If that doesn't help, close currently open C++ files and/or switch branches before restarting, which helps sometimes.
DSL syntax highlighting
There's a syntax highlighter extension for SerenityOS DSLs called "SerenityOS DSL Syntax Highlight", available here or here. The extension provides syntax highlighting for LibIPC's IPC files, Web IDL, and LibJS's serialization format (no extension) as output by js with the -d option.
Microsoft C/C++ tools
Note that enabling the extension in the same workspace as the clangd and clang-format extensions will cause conflicts.
If you choose to use Microsoft C/C++ Tools rather than clangd and clang-format, use the
following c_cpp_properties.json to circumvent some errors. Even with the configuration in place, the extension will likely still report errors related to types and methods not being found.
.vscode/c_cpp_properties.json
{
"configurations": [
{
"name": "ladybird-gcc",
"includePath": [
"${workspaceFolder}",
"${workspaceFolder}/Build/ladybird/",
"${workspaceFolder}/Build/ladybird/Userland",
"${workspaceFolder}/Build/ladybird/Userland/Libraries",
"${workspaceFolder}/Build/ladybird/Userland/Services",
"${workspaceFolder}/Userland",
"${workspaceFolder}/Userland/Libraries",
"${workspaceFolder}/Userland/Services"
],
"defines": [
"DEBUG"
],
"cStandard": "c17",
"cppStandard": "c++23",
"intelliSenseMode": "linux-gcc-x86",
"compileCommands": "Build/ladybird/compile_commands.json",
"compilerArgs": [
"-Wall",
"-Wextra",
"-Werror"
],
"browse": {
"path": [
"${workspaceFolder}",
"${workspaceFolder}/Build/ladybird/",
"${workspaceFolder}/Build/ladybird/Userland",
"${workspaceFolder}/Build/ladybird/Userland/Libraries",
"${workspaceFolder}/Build/ladybird/Userland/Services",
"${workspaceFolder}/Userland",
"${workspaceFolder}/Userland/Libraries",
"${workspaceFolder}/Userland/Services"
],
"limitSymbolsToIncludedHeaders": true,
"databaseFilename": "${workspaceFolder}/Build/ladybird/"
}
}
],
"version": 4
}
Formatting
clangd provides code formatting out of the box using the clang-format engine. clang-format support is also included with the Microsoft C/C++ tools (see above). The settings below include a key that makes the Microsoft extension use the proper style.
Settings
These belong in the .vscode/settings.json of Serenity.
{
// Excluding the generated directories keeps your file view clean and speeds up search.
"files.exclude": {
"**/.git": true,
"Toolchain/Local/**": true,
"Toolchain/Tarballs/**": true,
"Toolchain/Build/**": true,
"Build/**": true,
},
"search.exclude": {
"**/.git": true,
"Toolchain/Local/**": true,
"Toolchain/Tarballs/**": true,
"Toolchain/Build/**": true,
"Build/**": true,
},
// Force clang-format to respect Ladybird's .clang-format style file. This is not necessary if you're not using the Microsoft C++ extension.
"C_Cpp.clang_format_style": "file",
// Tab settings
"editor.tabSize": 4,
"editor.useTabStops": false,
// format trailing new lines
"files.trimFinalNewlines": true,
"files.insertFinalNewline": true,
// git commit message length
"git.inputValidationLength": 72,
"git.inputValidationSubjectLength": 72,
// If clangd was obtained from a package manager, its path can be set here.
"clangd.path": "clangd-18",
"clangd.arguments": [
"--header-insertion=never" // See https://github.com/clangd/clangd/issues/1247
]
}
Customization
Custom Tasks
You can create custom tasks (.vscode/tasks.json) to quickly compile Ladybird.
The following three example tasks should suffice in most situations, and allow you to specify the build system to use, as well as give you error highlighting.
.vscode/tasks.json
{
"version": "2.0.0",
"tasks": [
{
"label": "build lagom",
"type": "shell",
"problemMatcher": [
{
"base": "$gcc",
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
]
}
],
"command": [
"bash"
],
"args": [
"-c",
"\"Meta/ladybird.sh build\""
],
"presentation": {
"echo": true,
"reveal": "always",
"focus": false,
"group": "build",
"panel": "shared",
"showReuseMessage": true,
"clear": true
}
},
{
"label": "build",
"type": "shell",
"command": "bash",
"args": [
"-c",
"Meta/ladybird.sh build"
],
"problemMatcher": [
{
"base": "$gcc",
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
]
},
{
"source": "gcc",
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
],
"pattern": [
{
"regexp": "^([^\\s]*\\.S):(\\d*): (.*)$",
"file": 1,
"location": 2,
"message": 3
}
]
}
],
"group": {
"kind": "build",
"isDefault": true
}
},
{
"label": "launch",
"type": "shell",
"command": "bash",
"args": [
"-c",
"Meta/ladybird.sh run ladybird"
],
"options": {
"env": {
// Put your custom run configuration here
}
},
"problemMatcher": [
{
"base": "$gcc",
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
]
},
{
"source": "gcc",
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
],
"pattern": [
{
"regexp": "^([^\\s]*\\.S):(\\d*): (.*)$",
"file": 1,
"location": 2,
"message": 3
}
]
},
{
"source": "Assertion Failed",
"owner": "cpp",
"pattern": [
{
"regexp": "ASSERTION FAILED: (.*)$",
"message": 1
},
{
"regexp": "^((?:.*)\\.(h|cpp|c|S)):(\\d*)$",
"file": 1,
"location": 3
}
],
"fileLocation": [
"relative",
"${workspaceFolder}/Build/ladybird"
]
}
]
}
]
}
License snippet
The following snippet may be useful if you want to quickly generate a license header, put it in .vscode/ladybird.code-snippets:
{
"License": {
"scope": "cpp,c",
"prefix": "license",
"body": [
"/*",
" * Copyright (c) $CURRENT_YEAR, ${1:Your Name} <${2:YourName@Email.com}>.",
" *",
" * SPDX-License-Identifier: BSD-2-Clause",
" */"
],
"description": "License header"
}
}