Meta: Switch to clang-format-18 as the standard formatter

Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/823fdb83db
Pull-request: https://github.com/SerenityOS/serenity/pull/24096
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/alimpfard ✅

.devcontainer/features/serenity/devcontainer-feature.json

@@ -13,7 +13,7 @@
                 18,
                 "trunk"
             ],
-            "default": 16,
+            "default": 18,
             "description": "Select LLVM compiler version to use"
         },
         "enable_ladybird": {

.github/workflows/cmake.yml

@@ -57,9 +57,9 @@ jobs:
         # Packages below aren't.
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-16 ccache e2fsprogs gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build optipng qemu-utils qemu-system-i386 unzip generate-ninja libegl1-mesa-dev
+          sudo apt-get install -y clang-format-18 ccache e2fsprogs gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build optipng qemu-utils qemu-system-i386 unzip generate-ninja libegl1-mesa-dev
           if ${{ matrix.arch == 'aarch64' }}; then
             # FIXME: Remove this when we no longer build our own Qemu binary.
             sudo apt-get install libgtk-3-dev libpixman-1-dev libsdl2-dev libslirp-dev
@@ -72,7 +72,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install flake8 requests
       - name: Check versions
-        run: set +e; g++ --version; g++-13 --version; clang-format --version; clang-format-16 --version; prettier --version; python --version; python3 --version; ninja --version; flake8 --version; ccache --version; qemu-system-i386 --version; gn --version
+        run: set +e; g++ --version; g++-13 --version; clang-format --version; clang-format-18 --version; prettier --version; python --version; python3 --version; ninja --version; flake8 --version; ccache --version; qemu-system-i386 --version; gn --version
 
       - name: Enable KVM group perms
         run: |

.github/workflows/pvs-studio-static-analysis.yml

@@ -26,9 +26,9 @@ jobs:
         #
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-16 gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build unzip pvs-studio
+          sudo apt-get install -y clang-format-18 gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build unzip pvs-studio
 
       - name: Check versions
         run: set +e; g++ --version; g++-13 --version; ninja --version;

.github/workflows/sonar-cloud-static-analysis.yml

@@ -58,9 +58,9 @@ jobs:
         # Packages below aren't.
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main'
+          sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main'
           sudo apt-get update
-          sudo apt-get install -y clang-format-16 gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build unzip
+          sudo apt-get install -y clang-format-18 gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build unzip
 
       - name: Check versions
         run: set +e; g++ --version; g++-13 --version; ninja --version;

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Nobody is perfect, and sometimes we mess things up. That said, here are some goo
 **Do:**
 
 * Write in idiomatic SerenityOS C++20, using the `AK` containers in all code.
-* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 16 or later) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/SerenityOS/serenity/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-16.
+* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Use `clang-format` (version 18 or later) to automatically format C++ files. See [AdvancedBuildInstructions.md](https://github.com/SerenityOS/serenity/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.
 * 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 16 or later!**
+**Important: Make sure you use `clang-format` version 18 or later!**
 
 This document describes the coding style used for C++ code in the Serenity Operating System project. All new code should conform to this style.
 

Documentation/QtCreatorConfiguration.md

@@ -48,7 +48,7 @@ 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 16, as some OSes will ship older 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 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)

Meta/Azure/Setup.yml

@@ -9,9 +9,9 @@ steps:
     - script: |
         set -e
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-        sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main'
+        sudo add-apt-repository 'deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main'
         sudo apt-get update
-        sudo apt-get install clang-format-16 ccache e2fsprogs gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build qemu-utils qemu-system-i386 unzip lld
+        sudo apt-get install clang-format-18 ccache e2fsprogs gcc-13 g++-13 libstdc++-13-dev libmpfr-dev libmpc-dev ninja-build qemu-utils qemu-system-i386 unzip lld
       displayName: 'Install Dependencies'
 
   - ${{ if eq(parameters.os, 'Linux') }}:

Meta/lint-clang-format.sh

@@ -29,21 +29,21 @@ fi
 if (( ${#files[@]} )); then
     TOOLCHAIN_DIR=Toolchain/Local/clang/bin
     CLANG_FORMAT=false
-    if command -v clang-format-16 >/dev/null 2>&1 ; then
+    if command -v clang-format-18 >/dev/null 2>&1 ; then
-        CLANG_FORMAT=clang-format-16
+        CLANG_FORMAT=clang-format-18
-    elif command -v brew >/dev/null 2>&1 && command -v "$(brew --prefix llvm@16)"/bin/clang-format >/dev/null 2>&1 ; then
+    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@16)"/bin/clang-format
+        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 ' 16.' ; then
+    elif command -v $TOOLCHAIN_DIR/clang-format >/dev/null 2>&1 && $TOOLCHAIN_DIR/clang-format --version | grep -qF ' 18.' ; then
         CLANG_FORMAT=$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($NF, ".") - 1) < 16) exit 1; }'; then
+        if ! "${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 16 or later."
+            echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 18 or later."
             echo "It is very likely that the resulting changes are not what you wanted."
         fi
     else
-        echo "clang-format-16 is not available, but C or C++ files need linting! Either skip this script, or install clang-format-16."
+        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 16 or later.)"
+        echo "(If you install a package 'clang-format', please make sure it's version 18 or later.)"
         exit 1
     fi