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{ coreutils, git, writeDashBin }:
writeDashBin "git-preview" ''
set -efu
head_commit=$(${git}/bin/git log -1 --format=%H)
merge_commit=$1; shift
merge_message='Merge for git-preview'
preview_dir=$(${coreutils}/bin/mktemp --tmpdir -d git-preview.XXXXXXXX)
preview_branch=$(${coreutils}/bin/basename "$preview_dir")
${git}/bin/git worktree add -b "$preview_branch" "$preview_dir" >/dev/null
${git}/bin/git -C "$preview_dir" checkout "$head_commit"
${git}/bin/git -C "$preview_dir" merge -m "$merge_message" "$merge_commit"
${git}/bin/git -C "$preview_dir" diff "$head_commit.." "$@" &
${git}/bin/git branch -fd "$preview_branch"
${coreutils}/bin/rm -fR "$preview_dir"
wait
''
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