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TheRock/compiler/amd-llvm/libcxx/utils/clang-format-merge-driver.sh
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derek.holloway 7502bf64a4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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#!/usr/bin/env bash
# This script can be installed in .git/config to allow rebasing old patches across
# libc++'s clang-format of the whole tree. Most contributors should not require that
# since they don't have many pre-clang-format patches lying around. This script is to
# make it easier for contributors that do have such patches.
#
# The script is installed by running the following from the root of your repository:
#
# $ git config merge.libcxx-reformat.name "Run clang-format when rebasing libc++ patches"
# $ git config merge.libcxx-reformat.driver "libcxx/utils/clang-format-merge-driver.sh %O %A %B %P"
#
# This is based on https://github.com/nico/hack/blob/main/notes/auto_git_rebase_across_mechanical_changes.md.
# Many thanks to Nico Weber for paving the way here.
# Path to the file's contents at the ancestor's version.
base="$1"
# Path to the file's contents at the current version.
current="$2"
# Path to the file's contents at the other branch's version (for nonlinear histories, there might be multiple other branches).
other="$3"
# The path of the file in the repository.
path="$4"
clang-format --style=file --assume-filename="$path" < "$base" > "$base.tmp"
mv "$base.tmp" "$base"
clang-format --style=file --assume-filename="$path" < "$current" > "$current.tmp"
mv "$current.tmp" "$current"
clang-format --style=file --assume-filename="$path" < "$other" > "$other.tmp"
mv "$other.tmp" "$other"
git merge-file -Lcurrent -Lbase -Lother "$current" "$base" "$other"