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QtCreatorConfiguration.md

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Qt Creator Project Configuration

Setup

First, make sure you have a working toolchain and can build and run Ladybird. Go here for instructions for setting that up.

  • Install Qt Creator. You don't need the entire Qt setup, just click 'Qt Creator' on the left side, and install that.
  • Open Qt Creator, select File -> New File or Project...
  • Select Import Existing Project
  • Give it a name (some tools assume lower-case ladybird), and navigate to the root of your Ladybird project checkout. Click Next.
  • Wait for the file list to generate. This can take a minute or two!
  • Ignore the file list, we will overwrite it later. Click Next.
  • Set Add to version control to <None>. Click Finish.
  • In your shell, go to your Ladybird project directory, and invoke the Meta/refresh-ladybird-qtcreator.sh script to regenerate the ladybird.files file. You will also have to do this every time you delete or add a new file to the project.
  • Edit the ladybird.config file (In Qt Creator, hit ^K or CMD+K on a Mac to open the search dialog, type the name of the file and hit return to open it)
  • Add the following #defines to the file: 
    #define ENABLE_COMPILETIME_FORMAT_CHECK
#define SANITIZE_PTRS 1
  • Edit the ladybird.cxxflags file to say -std=c++23 -fsigned-char -fconcepts -fno-exceptions -fno-semantic-interposition -fPIC
  • Edit the ladybird.includes file to list the following lines: 
    ./
Userland/
Userland/Libraries/
Userland/Services/
Build/ladybird/
Build/ladybird/Userland/
Build/ladybird/Userland/Libraries/
Build/ladybird/Userland/Services/
AK/

Finally, search in the options for "BOM" (Text Editor > Behavior > File Encodings > UTF-8 BOM), and switch to "Always delete".

Qt Creator should be set up correctly now, go ahead and explore the project and try making changes. Have fun! :^)

Auto-Formatting

You can use clang-format to help you with the style guide. Before you proceed, check that you're actually using clang-format version 18, as some OSes will ship older clang-format versions by default.

  • In QtCreator, go to "Help > About Plugins…"
  • Find the Beautifier (experimental) row (for example, by typing beau into the search)
  • Put a checkmark into the box
  • Restart QtCreator if it asks you
  • In QtCreator, go to "Tools > Options…"
  • Type "beau" in the search box, go to "Beautifier > Clang Format"
  • Select the "customized" style, click "edit"
  • Paste the entire content of the file .clang-format into the "value" box, and click "OK"
  • In the "Beautifier > General" tab, check "Enable auto format on file save"
  • Select the tool "ClangFormat" if not already selected, and click "OK"

Note that not the entire project is clang-format-clean (yet), so sometimes you will see large diffs. Use your own judgement whether you want to include such changes. Generally speaking, if it's a few lines then it's a good idea; if it's the entire file then maybe there's a better way to do it, like doing a separate commit, or just ignoring the clang-format changes.

You may want to read up what git add -p does (or git checkout -p, to undo).

QtCreator tends to interpret IPC definitions as C++ headers, and then tries to format them. This is not useful. One way to avoid that is telling QtCreator that IPC definitions are not C++ headers.

  • In QtCreator, go to "Tools > Options…"
  • Type "beau" in the search box, go to "Environment > MIME Types"
  • In the little search box, type "plain", and select "text/plain"
  • In the "details" section, you should now see the list of Patterns, something like *.txt;*.asc;*,v. Extend it in the following way: *.txt;*.asc;*,v;*.ipc;*.gml
  • Click "OK" to close the dialog.
  • Maybe you need to close and open again the IPC files. You can check what QtCreator is doing by right-clicking the filename in the editor tab, and clicking "Properties...". In the third line, you should see MIME type: text/plain.

License template

You may have noticed how Andreas just types lic and the license appears.

In order to so, create a new file anywhere, for example license-template.creator, with the standard license:

/*
 * Copyright (c) 2024, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

In QtCreator, select the menu "Tools", item "Options", section "C++", tab "File Naming" (don't ask me why it's here). At the bottom there should be the option "License template:". Click "Browse…", select your file (i.e., license-template.creator). Click "OK", and you're done! :)