busybox/scripts/fix_ws.sh

#!/bin/bash
# Whitespace fixer
# Usage: fix_ws [dir]...

temp="/tmp/fix_ws.$$.$RANDOM"

# Using $'xxx' bashism
begin8sp_tab=$'s/^        /\t/'
beginchar7sp_chartab=$'s/^\\([^ \t]\\)       /\\1\t/'
tab8sp_tabtab=$'s/\t        /\t\t/g'
tab8sptab_tabtabtab=$'s/\t        \t/\t\t\t/g'
begin17sptab_tab=$'s/^ \\{1,7\\}\t/\t/'
tab17sptab_tabtab=$'s/\t \\{1,7\\}\t/\t\t/g'
trailingws_=$'s/[ \t]*$//'

#>fix_ws.diff

find "$@" -type f \
| while read name; do
    test "YES" = "${name/*.bz2/YES}" && continue
    test "YES" = "${name/*.gz/YES}" && continue
    test "YES" = "${name/*.png/YES}" && continue
    test "YES" = "${name/*.gif/YES}" && continue
    test "YES" = "${name/*.jpg/YES}" && continue
    test "YES" = "${name/*.diff/YES}" && continue
    test "YES" = "${name/*.patch/YES}" && continue
    # shell testsuite entries are not to be touched too
    test "YES" = "${name/*.right/YES}" && continue

    if test "YES" = "${name/*.[chsS]/YES}" \
	-o "YES" = "${name/*.sh/YES}" \
	-o "YES" = "${name/*.txt/YES}" \
	-o "YES" = "${name/*.html/YES}" \
	-o "YES" = "${name/*.htm/YES}" \
	-o "YES" = "${name/*Config.in*/YES}" \
    ; then
    # More aggressive whitespace fixes for known file types
	echo "Formatting: $name" >&2
	cat "$name" \
	| sed -e "$tab8sptab_tabtabtab" -e "$tab8sptab_tabtabtab" \
	      -e "$tab8sptab_tabtabtab" -e "$tab8sptab_tabtabtab" \
	| sed "$begin17sptab_tab" \
	| sed -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	      -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	      -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	| sed "$trailingws_"
    elif test "YES" = "${name/*Makefile*/YES}" \
	-o "YES" = "${name/*Kbuild*/YES}" \
    ; then
    # For Makefiles, never convert "1-7spaces+tab" into "tabtab"
	echo "Makefile: $name" >&2
	cat "$name" \
	| sed -e "$tab8sptab_tabtabtab" -e "$tab8sptab_tabtabtab" \
	      -e "$tab8sptab_tabtabtab" -e "$tab8sptab_tabtabtab" \
	| sed -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	      -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	      -e "$tab17sptab_tabtab" -e "$tab17sptab_tabtab" \
	| sed "$trailingws_"
    else
    # Only remove trailing WS for the rest
	echo "Removing trailing whitespace: $name" >&2
	cat "$name" \
	| sed "$trailingws_"
    fi >"$temp"

#    diff -u "$temp" "$name" >>fix_ws.diff

    # Conserve mode/symlink:
    cat "$temp" >"$name"
done
rm "$temp" 2>/dev/null