#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# bat-extras | Copyright (C) 2020 eth-p | MIT License
#
# Repository: https://github.com/eth-p/bat-extras
# Issues:     https://github.com/eth-p/bat-extras/issues
# -----------------------------------------------------------------------------
# shellcheck disable=SC1090
# --- BEGIN LIBRARY FILE: print.sh ---
printc(){
printf "$(sed "$_PRINTC_PATTERN" <<<"$1")" "${@:2}"
}
printc_init(){
case "$1" in
true)_PRINTC_PATTERN="$_PRINTC_PATTERN_ANSI";;
false)_PRINTC_PATTERN="$_PRINTC_PATTERN_PLAIN";;
"[DEFINE]"){
_PRINTC_PATTERN_ANSI=""
_PRINTC_PATTERN_PLAIN=""
local name
local ansi
while read -r name ansi;do
if [[ -z $name && -z $ansi ]]||[[ ${name:0:1} == "#" ]];then
continue
fi
ansi="${ansi/\\/\\\\}"
_PRINTC_PATTERN_PLAIN="${_PRINTC_PATTERN_PLAIN}s/%{$name}//g;"
_PRINTC_PATTERN_ANSI="${_PRINTC_PATTERN_ANSI}s/%{$name}/$ansi/g;"
done
if [[ -t 1 && -z ${NO_COLOR+x} ]];then
_PRINTC_PATTERN="$_PRINTC_PATTERN_ANSI"
else
_PRINTC_PATTERN="$_PRINTC_PATTERN_PLAIN"
fi
}
esac
}
print_warning(){
printc "%{YELLOW}[%s warning]%{CLEAR}: $1%{CLEAR}\n" "batdiff" "${@:2}" 1>&2
}
print_error(){
printc "%{RED}[%s error]%{CLEAR}: $1%{CLEAR}\n" "batdiff" "${@:2}" 1>&2
}
printc_init "[DEFINE]" <<END
	CLEAR	\x1B[0m
	RED		\x1B[31m
	GREEN	\x1B[32m
	YELLOW	\x1B[33m
	BLUE	\x1B[34m
	MAGENTA	\x1B[35m
	CYAN	\x1B[36m

	DEFAULT \x1B[39m
	DIM		\x1B[2m
END
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: pager.sh ---
is_pager_less(){
[[ "$(pager_name)" == "less" ]]
return $?
}
is_pager_bat(){
[[ "$(pager_name)" == "bat" ]]
return $?
}
is_pager_disabled(){
[[ -z "$(pager_name)" ]]
return $?
}
pager_name(){
_detect_pager 1>&2
echo "$_SCRIPT_PAGER_NAME"
}
pager_version(){
_detect_pager 1>&2
echo "$_SCRIPT_PAGER_VERSION"
}
pager_exec(){
if [[ -n $SCRIPT_PAGER_CMD ]];then
"$@"|pager_display
return $?
else
"$@"
return $?
fi
}
pager_display(){
if [[ -n $SCRIPT_PAGER_CMD ]];then
if [[ -n $SCRIPT_PAGER_ARGS ]];then
"${SCRIPT_PAGER_CMD[@]}" "${SCRIPT_PAGER_ARGS[@]}"
return $?
else
"${SCRIPT_PAGER_CMD[@]}"
return $?
fi
else
cat
return $?
fi
}
_detect_pager(){
if [[ $_SCRIPT_PAGER_DETECTED == "true" ]];then return;fi
_SCRIPT_PAGER_DETECTED=true
if [[ -z ${SCRIPT_PAGER_CMD[0]} ]];then
_SCRIPT_PAGER_VERSION=0
_SCRIPT_PAGER_NAME=""
return
fi
local output
local output1
output="$("${SCRIPT_PAGER_CMD[0]}" --version 2>&1)"
output1="$(head -n 1 <<<"$output")"
if [[ $output1 =~ ^less[[:blank:]]([[:digit:]]+) ]];then
_SCRIPT_PAGER_VERSION="${BASH_REMATCH[1]}"
_SCRIPT_PAGER_NAME="less"
elif [[ $output1 =~ ^bat(cat)?[[:blank:]]([[:digit:]]+) ]];then
__BAT_VERSION="${BASH_REMATCH[2]}"
_SCRIPT_PAGER_VERSION="${BASH_REMATCH[2]}"
_SCRIPT_PAGER_NAME="bat"
else
_SCRIPT_PAGER_VERSION=0
_SCRIPT_PAGER_NAME="$(basename "${SCRIPT_PAGER_CMD[0]}")"
fi
}
_configure_pager(){
SCRIPT_PAGER_ARGS=()
if [[ -n ${PAGER+x} ]];then
SCRIPT_PAGER_CMD=($PAGER)
else
SCRIPT_PAGER_CMD=("less")
fi
if [[ -n ${BAT_PAGER+x} ]];then
SCRIPT_PAGER_CMD=($BAT_PAGER)
SCRIPT_PAGER_ARGS=()
return
fi
if is_pager_bat;then
SCRIPT_PAGER_CMD=("less")
SCRIPT_PAGER_ARGS=()
fi
if is_pager_less;then
SCRIPT_PAGER_CMD=("${SCRIPT_PAGER_CMD[0]}" -R --quit-if-one-screen)
if [[ "$(pager_version)" -lt 500 ]];then
SCRIPT_PAGER_CMD+=(--no-init)
fi
fi
}
if [[ -t 1 ]];then
_configure_pager
else
SCRIPT_PAGER_CMD=()
SCRIPT_PAGER_ARGS=()
fi
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: opt.sh ---
SHIFTOPT_HOOKS=()
SHIFTOPT_SHORT_OPTIONS="VALUE"
setargs(){
_ARGV=("$@")
_ARGV_LAST="$((${#_ARGV[@]}-1))"
_ARGV_INDEX=0
_ARGV_SUBINDEX=1
}
getargs(){
if [[ $1 == "-a" || $1 == "--append" ]];then
if [[ $_ARGV_INDEX -ne "$((_ARGV_LAST+1))" ]];then
eval "$2=(\"\${$2[@]}\" $(printf '%q ' "${_ARGV[@]:_ARGV_INDEX}"))"
fi
else
if [[ $_ARGV_INDEX -ne "$((_ARGV_LAST+1))" ]];then
eval "$1=($(printf '%q ' "${_ARGV[@]:_ARGV_INDEX}"))"
else
eval "$1=()"
fi
fi
}
resetargs(){
setargs "${_ARGV_ORIGINAL[@]}"
}
_shiftopt_next(){
_ARGV_SUBINDEX=1
((_ARGV_INDEX++))||true
}
shiftopt(){
[[ $_ARGV_INDEX -gt $_ARGV_LAST ]]&&return 1
OPT="${_ARGV[$_ARGV_INDEX]}"
unset OPT_VAL
if [[ $OPT =~ ^-[a-zA-Z0-9_-]+=.* ]];then
OPT_VAL="${OPT#*=}"
OPT="${OPT%%=*}"
fi
if [[ $OPT =~ ^-[^-]{2,} ]];then
case "$SHIFTOPT_SHORT_OPTIONS" in
PASS)_shiftopt_next;;
CONV)OPT="-$OPT"
_shiftopt_next
;;
VALUE){
OPT="${_ARGV[$_ARGV_INDEX]}"
OPT_VAL="${OPT:2}"
OPT="${OPT:0:2}"
_shiftopt_next
};;
SPLIT){
OPT="-${OPT:_ARGV_SUBINDEX:1}"
((_ARGV_SUBINDEX++))||true
if [[ $_ARGV_SUBINDEX -gt ${#OPT} ]];then
_shiftopt_next
fi
};;
*)printf "shiftopt: unknown SHIFTOPT_SHORT_OPTIONS mode '%s'" \
"$SHIFTOPT_SHORT_OPTIONS" 1>&2
_shiftopt_next
esac
else
_shiftopt_next
fi
local hook
for hook in "${SHIFTOPT_HOOKS[@]}";do
if "$hook";then
shiftopt
return $?
fi
done
return 0
}
shiftval(){
if [[ -n ${OPT_VAL+x} ]];then
return 0
fi
if [[ $_ARGV_SUBINDEX -gt 1 && $SHIFTOPT_SHORT_OPTIONS == "SPLIT" ]];then
OPT_VAL="${_ARGV[$((_ARGV_INDEX+1))]}"
else
OPT_VAL="${_ARGV[$_ARGV_INDEX]}"
_shiftopt_next
fi
if [[ $OPT_VAL =~ -.* ]];then
printc "%{RED}%s: '%s' requires a value%{CLEAR}\n" "batdiff" "$ARG"
exit 1
fi
}
setargs "$@"
_ARGV_ORIGINAL=("$@")
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: opt_hook_color.sh ---
hook_color(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__color")
__shiftopt_hook__color(){
case "$OPT" in
--no-color)OPT_COLOR=false;;
--color){
case "$OPT_VAL" in
"")OPT_COLOR=true;;
always|true)OPT_COLOR=true;;
never|false)OPT_COLOR=false;;
auto)return 0;;
*)printc "%{RED}%s: '--color' expects value of 'auto', 'always', or 'never'%{CLEAR}\n" "batdiff"
exit 1
esac
};;
*)return 1
esac
printc_init "$OPT_COLOR"
return 0
}
if [[ -z $OPT_COLOR ]];then
if [[ -t 1 ]];then
OPT_COLOR=true
else
OPT_COLOR=false
fi
printc_init "$OPT_COLOR"
fi
}
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: opt_hook_pager.sh ---
hook_pager(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__pager")
__shiftopt_hook__pager(){
case "$OPT" in
--no-pager)shiftval
SCRIPT_PAGER_CMD=''
;;
--paging){
shiftval
case "$OPT_VAL" in
auto):;;
always):;;
never)SCRIPT_PAGER_CMD='';;
*)printc "%{RED}%s: '--paging' expects value of 'auto', 'always', or 'never'%{CLEAR}\n" "batdiff"
exit 1
esac
};;
--pager){
shiftval
{
SCRIPT_PAGER_CMD=($OPT_VAL)
PAGER_ARGS=()
}
};;
*)return 1
esac
}
}
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: opt_hook_version.sh ---
hook_version(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__version")
__shiftopt_hook__version(){
if [[ $OPT == "--version" ]];then
printf "%s %s\n\n%s\n%s\n" \
"batdiff" \
"2024.08.24" \
"Copyright (C) 2019-2021 eth-p | MIT License" \
"https://github.com/eth-p/bat-extras"
exit 0
fi
return 1
}
}
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: opt_hook_width.sh ---
term_width(){
local width="$({ stty size 2>/dev/null||echo "22 80";}|cut -d ' ' -f2)"
if [[ $width -ne 0 ]];then
echo "$width"
else
echo "80"
fi
return 0
}
term_clear(){
printf "\x1B[3J\x1B[2J\x1B[H"
}
hook_width(){
SHIFTOPT_HOOKS+=("__shiftopt_hook__width")
__shiftopt_hook__width(){
case "$OPT" in
--terminal-width)shiftval
OPT_TERMINAL_WIDTH="$OPT_VAL"
;;
*)return 1
esac
return 0
}
OPT_TERMINAL_WIDTH="$(term_width)"
}
# --- END LIBRARY FILE ---
# --- BEGIN LIBRARY FILE: version.sh ---
bat_version(){
if [[ -z $__BAT_VERSION ]];then
__BAT_VERSION="$(command "bat" --version|cut -d ' ' -f 2)"
fi
echo "$__BAT_VERSION"
}
version_compare(){
local version="$1"
local compare="$3"
if ! [[ $version =~ \.$ ]];then
version="$version."
fi
if ! [[ $compare =~ \.$ ]];then
compare="$compare."
fi
version_compare__recurse "$version" "$2" "$compare"
return $?
}
version_compare__recurse(){
local version="$1"
local operator="$2"
local compare="$3"
local v_major="${version%%.*}"
local c_major="${compare%%.*}"
local v_minor="${version#*.}"
local c_minor="${compare#*.}"
if [[ -z $v_minor && -z $c_minor ]];then
[ "$v_major" $operator "$c_major" ]
return $?
fi
if [[ -z $v_minor ]];then
v_minor="0."
fi
if [[ -z $c_minor ]];then
c_minor="0."
fi
case "$operator" in
-eq)[[ $v_major -ne $c_major ]]&&return 1;;
-ne)[[ $v_major -ne $c_major ]]&&return 0;;
-ge|-gt)[[ $v_major -lt $c_major ]]&&return 1
[[ $v_major -gt $c_major ]]&&return 0
;;
-le|-lt)[[ $v_major -gt $c_major ]]&&return 1
[[ $v_major -lt $c_major ]]&&return 0
esac
version_compare__recurse "$v_minor" "$operator" "$c_minor"
}
# --- END LIBRARY FILE ---
# -----------------------------------------------------------------------------
# Init:
# -----------------------------------------------------------------------------
hook_color
hook_pager
hook_version
hook_width
# -----------------------------------------------------------------------------
# Options:
# -----------------------------------------------------------------------------
BATDIFF_USE_DELTA="${BATDIFF_USE_DELTA:-}"

SUPPORTS_BAT_DIFF=false
SUPPORTS_DELTA=false

BAT_VERSION="$(bat_version)"
BAT_ARGS=()
DELTA_ARGS=()
DELTA_VERSION='unsupported'
GIT_ARGS=()

FILES=()
OPT_TABS=
OPT_CONTEXT=2
OPT_STAGED=false
OPT_ALL_CHANGES=false

# Set options based on bat version.
if version_compare "$BAT_VERSION" -ge "0.15"; then
	SUPPORTS_BAT_DIFF=true
fi

# Set options based on delta availability.
if command -v "delta" &>/dev/null; then
	SUPPORTS_DELTA=true
	DELTA_VERSION="$("delta" --version | cut -d' ' -f2)"
fi

# Set options based on delta version.
#  - 0.12  -- Renamed `--hunk-style` to `--hunk-header-decoration-style`.
if version_compare "$DELTA_VERSION" -ge "0.12"; then
	DELTA_ARGS+=("--hunk-header-decoration-style=plain")
else
	DELTA_ARGS+=("--hunk-style=plain")
fi

# Parse arguments.
while shiftopt; do
	case "$OPT" in

	# bat options
	-C | --context | --diff-context)   shiftval; OPT_CONTEXT="$OPT_VAL" ;;
	--terminal-width)                  shiftval; OPT_TERMINAL_WIDTH="$OPT_VAL" ;;
	--tabs)                            shiftval; OPT_TABS="$OPT_VAL" ;;

	# Script options
	--all)                      OPT_ALL_CHANGES=true ;;
	--staged)                   OPT_STAGED=true; GIT_ARGS+=("--staged") ;;
	--delta)                    BATDIFF_USE_DELTA=true ;;

	# ???
	-*) {
		printc "%{RED}%s: unknown option '%s'%{CLEAR}\n" "batdiff" "$OPT" 1>&2
		exit 1
	} ;;

	# Files
	*) FILES+=("$OPT") ;;

	esac
done

# Append arguments for delta/bat.
BAT_ARGS+=("--terminal-width=${OPT_TERMINAL_WIDTH}" "--paging=never")
DELTA_ARGS+=(
	"--width=${OPT_TERMINAL_WIDTH}" 
	"--paging=never"
)

if "$OPT_COLOR"; then
	BAT_ARGS+=("--color=always")
else
	BAT_ARGS+=("--color=never")
	DELTA_ARGS+=("--theme=none")
fi

if [[ -n "$OPT_TABS" ]]; then
	BAT_ARGS+=("--tabs=${OPT_TABS}")
	DELTA_ARGS+=("--tabs=${OPT_TABS}")
fi

# Append arguments for git.
GIT_ARGS+=(-U"$OPT_CONTEXT")

# -----------------------------------------------------------------------------
# Functions:
# -----------------------------------------------------------------------------

ensure_git_directory() {
	if ! "git" rev-parse --show-toplevel &>/dev/null; then
		print_error "Not a git repository."
		printc "\n%s\nTo view a diff between two files, use %{CYAN}%s [file] [file]%{CLEAR}." \
			"To view a diff between staged files and the working directory, enter a git repository." \
			"batdiff"
		exit 1
	fi
}

# -----------------------------------------------------------------------------
# Printing:
# -----------------------------------------------------------------------------

print_bat_diff() {
	local files=("$@")

	# Diff two files.
	if [[ "${#files[@]}" -eq 2 ]]; then
		diff --unified="$OPT_CONTEXT" "${files[@]}" | "bat" --language=diff - "${BAT_ARGS[@]}"
		return $?
	fi

	# Diff staged git file.
	ensure_git_directory
	if "$OPT_STAGED"; then
		if false && "$SUPPORTS_DELTA"; then
			# bat doesn't support diffing staged changes against the HEAD.
			# Delta is better suited for printing diffs in this case.
			print_delta_diff "$@"
		else
			difftext="$("git" diff "${GIT_ARGS[@]}" "${files[0]}")"
			if [[ "${#difftext}" -gt 0 ]]; then
				"bat" --language=diff --file-name="${files[0]}" - "${BAT_ARGS[@]}" <<< "$difftext"
			fi
		fi
		return $?
	fi

	# Diff git file.
	if "$SUPPORTS_BAT_DIFF"; then
		"git" diff "${GIT_ARGS[@]}" --name-only -z "${files[0]}" \
			| xargs --null "bat" --diff --diff-context="$OPT_CONTEXT" "${BAT_ARGS[@]}"
	else
		"git" diff "${GIT_ARGS[@]}" "${files[0]}" | "bat" --language=diff - "${BAT_ARGS[@]}"
	fi
}

print_delta_diff() {
	local files=("$@")

	# Diff two files.
	if [[ "${#files[@]}" -eq 2 ]]; then
		diff --unified="$OPT_CONTEXT" "${files[@]}"  | "delta" "${DELTA_ARGS[@]}"
		return $?
	fi

	# Diff git file.
	ensure_git_directory
	"git" diff "${GIT_ARGS[@]}" "${files[0]}" | "delta" "${DELTA_ARGS[@]}"
}

if [[ "$BATDIFF_USE_DELTA" = "true" && "$SUPPORTS_DELTA" = "true" ]]; then
	print_diff() {
		print_delta_diff "$@"
		return $?
	}
else
	print_diff() {
		print_bat_diff "$@"
		return $?
	}
fi


# -----------------------------------------------------------------------------
# Validation:
# -----------------------------------------------------------------------------

# Handle too many files.
if [[ "${#FILES[@]}" -gt 2 ]]; then
	print_error "too many files provided"
	exit 1
fi

# Handle deprecated --all.
if "$OPT_ALL_CHANGES"; then
	print_warning "argument --all is deprecated. Use '%s' instead" "$0"
fi


# -----------------------------------------------------------------------------
# Main:
# -----------------------------------------------------------------------------
main() {
	if [[ "${#FILES[@]}" -eq 0 ]] || "$OPT_ALL_CHANGES"; then
		ensure_git_directory
		local file
		while read -r file; do
			if [[ -f "$file" ]]; then
				print_diff "$file"
			fi
		done < <("git" diff "${GIT_ARGS[@]}" --name-only --diff-filter=d)
		return
	fi

	print_diff "${FILES[@]}"
}

pager_exec main
exit $?
