chibi-scheme/.githooks/pre-commit

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#!/bin/bash
if git rev-parse --verify HEAD >/dev/null 2>&1; then
against=HEAD
else
# Initial commit: diff against an empty tree object
against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi
# fail if we add any new lines to C or Scheme source containing a tab
if git diff --name-only "$against" | egrep -q '\.(cpp|h|scm|sld|stub)$' &&\
git diff --name-only "$against" |\
egrep '\.(cpp|h|scm|sld|stub)$' |\
xargs -d'\n' git diff -U0 --no-color "$against" -- |\
grep -q $'^+ *\t'; then
echo "Error: Attempting to add a source file using tabs for indentation."
echo
echo -n " "
git diff --name-only "$against" |\
egrep '\.(cpp|h|scm|sld|stub)$' |\
xargs -d'\n' git diff -U0 "$against" -- |\
grep $'^+ *\t' | head -1
echo
cat <<EOF
It's important for arguments to line up vertically to a precise column.
Since there is no standard tab width, using tabs for indentation makes
this impossible in general. Please use spaces.
EOF
exit 1
fi