git aliases to remove end of line whitespace before committing

gistfile1.txt

# git cleancommit <files>
# removes trailing end-of-line whitespace in staged or committed files
cleancommit = "!bash -c 'commit_args=\"\"; files_to_clean=\"\"; for i in \"$@\"; do if [[ \"$i\" == -* ]]; then commit_args=\"$commit_args $i\"; else if [[ \"$i\" = /* ]]; then files_to_clean=\"$files_to_clean $i\"; else files_to_clean=\"$files_to_clean ${GIT_PREFIX}$i\"; fi; fi; done; if [ -n \"$files_to_clean\" ]; then git diff --name-only -- $files_to_clean | while IFS= read -r file; do if [ -f \"$file\" ]; then temp_file=$(mktemp); git diff -U0 \"$file\" | grep \"^@@\" | awk \"{split(\\$3,a,\\\",\\\"); line=substr(a[1],2); count=(length(a)>1)?a[2]:1; for(i=0;i<count;i++) if(line+i>0) print line+i}\" > \"$temp_file\"; while read -r line_num; do if [ -n \"$line_num\" ] && [[ \"$line_num\" =~ ^[0-9]+$ ]]; then sed -i \"\" \"$line_num s/[[:space:]]*$//\" \"$file\"; fi; done < \"$temp_file\"; rm -f \"$temp_file\"; git add \"$file\"; fi; done; else git diff --cached --name-only --diff-filter=ACM | while IFS= read -r file; do if [ -f \"$file\" ]; then temp_file=$(mktemp); git diff --cached -U0 \"$file\" | grep \"^@@\" | awk \"{split(\\$3,a,\\\",\\\"); line=substr(a[1],2); count=(length(a)>1)?a[2]:1; for(i=0;i<count;i++) if(line+i>0) print line+i}\" > \"$temp_file\"; while read -r line_num; do if [ -n \"$line_num\" ] && [[ \"$line_num\" =~ ^[0-9]+$ ]]; then sed -i \"\" \"$line_num s/[[:space:]]*$//\" \"$file\"; fi; done < \"$temp_file\"; rm -f \"$temp_file\"; git add \"$file\"; fi; done; fi; git commit $commit_args $files_to_clean' --"

# git cleandiff <files>
# view a diff without end-of-line whitespace
cleandiff = "!f() { orig_dir=$(mktemp -d); clean_dir=$(mktemp -d); search_paths=\"\"; if [ $# -eq 0 ]; then search_paths=\".\"; else for arg in \"${@:1}\"; do if [[ \"$arg\" = /* ]]; then search_paths=\"$search_paths $arg\"; else search_paths=\"$search_paths ${GIT_PREFIX}$arg\"; fi; done; fi; git diff --name-only -- $search_paths | while read file; do if [ -f \"$file\" ]; then mkdir -p \"$clean_dir/$(dirname \"$file\")\"; mkdir -p \"$orig_dir/$(dirname \"$file\")\"; cp \"$file\" \"$clean_dir/$file\"; temp_file=$(mktemp); git diff -U0 \"$file\" | grep '^@@' | awk '{split($3,a,\",\"); line=substr(a[1],2); count=(length(a)>1)?a[2]:1; for(i=0;i<count;i++) if(line+i>0) print line+i}' > \"$temp_file\"; while read line_num; do sed -i \"\" \"${line_num}s/[[:space:]]*$//\" \"$clean_dir/$file\"; done < \"$temp_file\"; rm -f \"$temp_file\"; git show HEAD:\"$file\" > \"$orig_dir/$file\" 2>/dev/null || touch \"$orig_dir/$file\"; fi; done; git -c color.diff=always diff --no-index \"$orig_dir\" \"$clean_dir\" 2>/dev/null || true; rm -rf \"$orig_dir\" \"$clean_dir\"; }; f"

# why weird shell script aliases instead of pre-commit hooks? git doesn't allow globally shared pre-commit hooks, so you either add things to every repo, or use a global commit hook system which ignores local repos.
# By using aliases, you at least get the same commands everywhere.
# Also, the ~/.gitconfig format doesn't allow commands to run across mutiple lines, so enjoy all that mess.