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Bash script to find all single-character commits in a git repository
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first_commit=$(git log --pretty=format:%H | tail -1) | |
git rev-list --all --no-merges | | |
while read commit; do | |
if [ $commit == $first_commit ]; then break; fi; | |
IFS_backup=$IFS | |
IFS=$'\n' | |
diff_lines=( $(git diff --numstat --minimal -U0 --word-diff=porcelain $commit^ $commit | grep -E '^(\+[^+]|-[^-]).*$') ) | |
IFS=$IFS_backup | |
character_count_diff=$(expr ${#diff_lines[0]} - ${#diff_lines[1]}) | |
if [ ${#diff_lines[@]} -eq 2 ] && [ ${character_count_diff#-} -lt 2 ]; then | |
for (( i=1; i<${#diff_lines[0]}; i++ )); do | |
character=${diff_lines[0]:$i:1} | |
if [ "$character" = "${diff_lines[1]:$i:1}" ]; then continue; fi; | |
next_index=$(expr $i + 1) | |
single_subtraction=$(expr "${diff_lines[0]:$i}" = "${diff_lines[1]:$next_index}") | |
single_addition=$(expr "${diff_lines[1]:$i}" = "${diff_lines[0]:$next_index}") | |
# $single_substitution needs 'x's for cases where (for example) the diff is '-300 +60' | |
# and '00' and '000' would otherwise end up being compared as numbers and deemed equal | |
single_substitution=$(expr "x${diff_lines[0]:$next_index}" = "x${diff_lines[1]:$next_index}") | |
if [ $single_subtraction -eq 1 ] || [ $single_addition -eq 1 ] || [ $single_substitution -eq 1 ]; then | |
echo "$(git log --pretty=oneline $commit^...$commit)" | |
echo "$(git diff --minimal $commit^ $commit)" | |
echo '' | |
echo '' | |
fi; | |
break | |
done | |
fi; | |
done |
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