Meta: Switch to clang-format-19 as the standard formatter

.github/workflows/lint-code.yml

@@ -15,7 +15,7 @@ jobs:
         run: |
           set -e
 
-          brew install curl flake8 llvm@18 ninja shellcheck swift-format unzip
+          brew install curl flake8 llvm@19 ninja shellcheck swift-format unzip
 
           # Note: gn isn't available in homebrew :(
           # Corresponds to https://gn.googlesource.com/gn/+/225e90c5025bf74f41dbee60d9cde4512c846fe7

CONTRIBUTING.md

@@ -66,7 +66,7 @@ Nobody is perfect, and sometimes we mess things up. That said, here are some goo
 **Do:**
 
 * Write in idiomatic project-style C++23, using the `AK` containers in all code.
-* Conform to the project coding style found in [CodingStyle.md](https://github.com/LadybirdBrowser/ladybird/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 18) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/LadybirdBrowser/ladybird/blob/master/Documentation/AdvancedBuildInstructions.md#clang-format-updates) for instructions on how to get an up-to-date version if your OS distribution does not ship clang-format-18.
+* Conform to the project coding style found in [CodingStyle.md](https://github.com/LadybirdBrowser/ladybird/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 19) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/LadybirdBrowser/ladybird/blob/master/Documentation/AdvancedBuildInstructions.md#clang-format-updates) for instructions on how to get an up-to-date version if your OS distribution does not ship clang-format-19.
 * Choose expressive variable, function and class names. Make it as obvious as possible what the code is doing.
 * Split your changes into separate, atomic commits (i.e. A commit per feature or fix, where the build, tests and the system are all functioning).
 * Make sure your commits are rebased on the master branch.

Documentation/CodingStyle.md

@@ -2,7 +2,7 @@
 
 For low-level styling (spaces, parentheses, brace placement, etc), all code should follow the format specified in `.clang-format` in the project root.
 
-**Important: Make sure you use `clang-format` version 18!**
+**Important: Make sure you use `clang-format` version 19!**
 
 This document describes the coding style used for C++ code in the Ladybird Browser project. All new code should conform to this style.
 
@@ -505,7 +505,7 @@ wrapping or to insert necessary punctuation such as adding `**` when a number is
 done using elements like `<sup>` which do not appear in the copied text.
 
 Please wrap long comments onto multiple lines so that they are easier to read. Generally, 120 characters is a good width
-to aim for. 
+to aim for.
 
 Use FIXME: (without attribution) to denote items that need to be addressed in the future.
 TODO: (without attribution) is also permitted.

Documentation/EditorConfiguration/QtCreatorConfiguration.md

@@ -36,7 +36,7 @@ Qt Creator should be set up correctly now, go ahead and explore the project and
 
 ## Auto-Formatting
 
-You can use `clang-format` to help you with the [style guide](../CodingStyle.md). Before you proceed, check that you're actually using clang-format version 18, as some OSes will ship other clang-format versions by default.
+You can use `clang-format` to help you with the [style guide](../CodingStyle.md). Before you proceed, check that you're actually using the clang-format version specified in the style guide, as some OSes will ship other 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)

Meta/lint-clang-format.sh

@@ -28,21 +28,21 @@ fi
 if (( ${#files[@]} )); then
     TOOLCHAIN_DIR=Toolchain/Local/clang/bin
     CLANG_FORMAT=false
-    if command -v clang-format-18 >/dev/null 2>&1 ; then
-        CLANG_FORMAT=clang-format-18
-    elif command -v brew >/dev/null 2>&1 && command -v "$(brew --prefix llvm@18)"/bin/clang-format >/dev/null 2>&1 ; then
-        CLANG_FORMAT="$(brew --prefix llvm@18)"/bin/clang-format
-    elif command -v $TOOLCHAIN_DIR/clang-format >/dev/null 2>&1 && $TOOLCHAIN_DIR/clang-format --version | grep -qF ' 18.' ; then
+    if command -v clang-format-19 >/dev/null 2>&1 ; then
+        CLANG_FORMAT=clang-format-19
+    elif command -v brew >/dev/null 2>&1 && command -v "$(brew --prefix llvm@19)"/bin/clang-format >/dev/null 2>&1 ; then
+        CLANG_FORMAT="$(brew --prefix llvm@19)"/bin/clang-format
+    elif command -v $TOOLCHAIN_DIR/clang-format >/dev/null 2>&1 && $TOOLCHAIN_DIR/clang-format --version | grep -qF ' 19.' ; then
         CLANG_FORMAT=$TOOLCHAIN_DIR/clang-format
     elif command -v clang-format >/dev/null 2>&1 ; then
         CLANG_FORMAT=clang-format
-        if ! "${CLANG_FORMAT}" --version | awk '{ if (substr($NF, 1, index($NF, ".") - 1) != 18) exit 1; }'; then
-            echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 18."
+        if ! "${CLANG_FORMAT}" --version | awk '{ if (substr($NF, 1, index($NF, ".") - 1) != 19) exit 1; }'; then
+            echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 19."
             echo "It is very likely that the resulting changes are not what you wanted."
         fi
     else
-        echo "clang-format-18 is not available, but C or C++ files need linting! Either skip this script, or install clang-format-18."
-        echo "(If you install a package 'clang-format', please make sure it's version 18.)"
+        echo "clang-format-19 is not available, but C or C++ files need linting! Either skip this script, or install clang-format-19."
+        echo "(If you install a package 'clang-format', please make sure it's version 19.)"
         exit 1
     fi