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#!/usr/bin/perl

use 5.008;
use strict;
use warnings;
use Git;

binmode(STDOUT, ":raw");

my $repo = Git->repository();

my $menu_use_color = $repo->get_colorbool('color.interactive');
my ($prompt_color, $header_color, $help_color) =
$menu_use_color ? (
$repo->get_color('color.interactive.prompt', 'bold blue'),
$repo->get_color('color.interactive.header', 'bold'),
$repo->get_color('color.interactive.help', 'red bold'),
) : ();
my $error_color = ();
if ($menu_use_color) {
my $help_color_spec = ($repo->config('color.interactive.help') or
'red bold');
$error_color = $repo->get_color('color.interactive.error',
$help_color_spec);
}

my $diff_use_color = $repo->get_colorbool('color.diff');
my ($fraginfo_color) =
$diff_use_color ? (
$repo->get_color('color.diff.frag', 'cyan'),
) : ();
my ($diff_plain_color) =
$diff_use_color ? (
$repo->get_color('color.diff.plain', ''),
) : ();
my ($diff_old_color) =
$diff_use_color ? (
$repo->get_color('color.diff.old', 'red'),
) : ();
my ($diff_new_color) =
$diff_use_color ? (
$repo->get_color('color.diff.new', 'green'),
) : ();

my $normal_color = $repo->get_color("", "reset");

my $use_readkey = 0;
my $use_termcap = 0;
my %term_escapes;

sub ReadMode;
sub ReadKey;
if ($repo->config_bool("interactive.singlekey")) {
eval {
require Term::ReadKey;
Term::ReadKey->import;
$use_readkey = 1;
};
eval {
require Term::Cap;
my $termcap = Term::Cap->Tgetent;
foreach (values %$termcap) {
$term_escapes{$_} = 1 if /^\e/;
}
$use_termcap = 1;
};
}

sub colored {
my $color = shift;
my $string = join("", @_);

if (defined $color) {
# Put a color code at the beginning of each line, a reset at the end
# color after newlines that are not at the end of the string
$string =~ s/(\n+)(.)/$1$color$2/g;
# reset before newlines
$string =~ s/(\n+)/$normal_color$1/g;
# codes at beginning and end (if necessary):
$string =~ s/^/$color/;
$string =~ s/$/$normal_color/ unless $string =~ /\n$/;
}
return $string;
}

# command line options
my $patch_mode;
my $patch_mode_revision;

sub apply_patch;
sub apply_patch_for_checkout_commit;
sub apply_patch_for_stash;

my %patch_modes = (
'stage' => {
DIFF => 'diff-files -p',
APPLY => sub { apply_patch 'apply --cached', @_; },
APPLY_CHECK => 'apply --cached',
VERB => 'Stage',
TARGET => '',
PARTICIPLE => 'staging',
FILTER => 'file-only',
IS_REVERSE => 0,
},
'stash' => {
DIFF => 'diff-index -p HEAD',
APPLY => sub { apply_patch 'apply --cached', @_; },
APPLY_CHECK => 'apply --cached',
VERB => 'Stash',
TARGET => '',
PARTICIPLE => 'stashing',
FILTER => undef,
IS_REVERSE => 0,
},
'reset_head' => {
DIFF => 'diff-index -p --cached',
APPLY => sub { apply_patch 'apply -R --cached', @_; },
APPLY_CHECK => 'apply -R --cached',
VERB => 'Unstage',
TARGET => '',
PARTICIPLE => 'unstaging',
FILTER => 'index-only',
IS_REVERSE => 1,
},
'reset_nothead' => {
DIFF => 'diff-index -R -p --cached',
APPLY => sub { apply_patch 'apply --cached', @_; },
APPLY_CHECK => 'apply --cached',
VERB => 'Apply',
TARGET => ' to index',
PARTICIPLE => 'applying',
FILTER => 'index-only',
IS_REVERSE => 0,
},
'checkout_index' => {
DIFF => 'diff-files -p',
APPLY => sub { apply_patch 'apply -R', @_; },
APPLY_CHECK => 'apply -R',
VERB => 'Discard',
TARGET => ' from worktree',
PARTICIPLE => 'discarding',
FILTER => 'file-only',
IS_REVERSE => 1,
},
'checkout_head' => {
DIFF => 'diff-index -p',
APPLY => sub { apply_patch_for_checkout_commit '-R', @_ },
APPLY_CHECK => 'apply -R',
VERB => 'Discard',
TARGET => ' from index and worktree',
PARTICIPLE => 'discarding',
FILTER => undef,
IS_REVERSE => 1,
},
'checkout_nothead' => {
DIFF => 'diff-index -R -p',
APPLY => sub { apply_patch_for_checkout_commit '', @_ },
APPLY_CHECK => 'apply',
VERB => 'Apply',
TARGET => ' to index and worktree',
PARTICIPLE => 'applying',
FILTER => undef,
IS_REVERSE => 0,
},
);

my %patch_mode_flavour = %{$patch_modes{stage}};

sub run_cmd_pipe {
if ($^O eq 'MSWin32' || $^O eq 'msys') {
my @invalid = grep {m/[":*]/} @_;
die "$^O does not support: @invalid\n" if @invalid;
my @args = map { m/ /o ? "\"$_\"": $_ } @_;
return qx{@args};
} else {
my $fh = undef;
open($fh, '-|', @_) or die;
return <$fh>;
}
}

my ($GIT_DIR) = run_cmd_pipe(qw(git rev-parse --git-dir));

if (!defined $GIT_DIR) {
exit(1); # rev-parse would have already said "not a git repo"
}
chomp($GIT_DIR);

my %cquote_map = (
 "b" => chr(8),
 "t" => chr(9),
 "n" => chr(10),
 "v" => chr(11),
 "f" => chr(12),
 "r" => chr(13),
 "\\" => "\\",
 "\042" => "\042",
);

sub unquote_path {
local ($_) = @_;
my ($retval, $remainder);
if (!/^\042(.*)\042$/) {
return $_;
}
($_, $retval) = ($1, "");
while (/^([^\\]*)\\(.*)$/) {
$remainder = $2;
$retval .= $1;
for ($remainder) {
if (/^([0-3][0-7][0-7])(.*)$/) {
$retval .= chr(oct($1));
$_ = $2;
last;
}
if (/^([\\\042btnvfr])(.*)$/) {
$retval .= $cquote_map{$1};
$_ = $2;
last;
}
# This is malformed -- just return it as-is for now.
return $_[0];
}
$_ = $remainder;
}
$retval .= $_;
return $retval;
}

sub refresh {
my $fh;
open $fh, 'git update-index --refresh |'
or die;
while (<$fh>) {
;# ignore 'needs update'
}
close $fh;
}

sub list_untracked {
map {
chomp $_;
unquote_path($_);
}
run_cmd_pipe(qw(git ls-files --others --exclude-standard --), @ARGV);
}

my $status_fmt = '%12s %12s %s';
my $status_head = sprintf($status_fmt, 'staged', 'unstaged', 'path');

{
my $initial;
sub is_initial_commit {
$initial = system('git rev-parse HEAD -- >/dev/null 2>&1') != 0
unless defined $initial;
return $initial;
}
}

sub get_empty_tree {
return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
}

# Returns list of hashes, contents of each of which are:
# VALUE: pathname
# BINARY: is a binary path
# INDEX: is index different from HEAD?
# FILE: is file different from index?
# INDEX_ADDDEL: is it add/delete between HEAD and index?
# FILE_ADDDEL: is it add/delete between index and file?
# UNMERGED: is the path unmerged

sub list_modified {
my ($only) = @_;
my (%data, @return);
my ($add, $del, $adddel, $file);
my @tracked = ();

if (@ARGV) {
@tracked = map {
chomp $_;
unquote_path($_);
} run_cmd_pipe(qw(git ls-files --), @ARGV);
return if (!@tracked);
}

my $reference;
if (defined $patch_mode_revision and $patch_mode_revision ne 'HEAD') {
$reference = $patch_mode_revision;
} elsif (is_initial_commit()) {
$reference = get_empty_tree();
} else {
$reference = 'HEAD';
}
for (run_cmd_pipe(qw(git diff-index --cached
--numstat --summary), $reference,
'--', @tracked)) {
if (($add, $del, $file) =
/^([-\d]+) ([-\d]+) (.*)/) {
my ($change, $bin);
$file = unquote_path($file);
if ($add eq '-' && $del eq '-') {
$change = 'binary';
$bin = 1;
}
else {
$change = "+$add/-$del";
}
$data{$file} = {
INDEX => $change,
BINARY => $bin,
FILE => 'nothing',
}
}
elsif (($adddel, $file) =
/^ (create|delete) mode [0-7]+ (.*)$/) {
$file = unquote_path($file);
$data{$file}{INDEX_ADDDEL} = $adddel;
}
}

for (run_cmd_pipe(qw(git diff-files --numstat --summary --raw --), @tracked)) {
if (($add, $del, $file) =
/^([-\d]+) ([-\d]+) (.*)/) {
$file = unquote_path($file);
my ($change, $bin);
if ($add eq '-' && $del eq '-') {
$change = 'binary';
$bin = 1;
}
else {
$change = "+$add/-$del";
}
$data{$file}{FILE} = $change;
if ($bin) {
$data{$file}{BINARY} = 1;
}
}
elsif (($adddel, $file) =
/^ (create|delete) mode [0-7]+ (.*)$/) {
$file = unquote_path($file);
$data{$file}{FILE_ADDDEL} = $adddel;
}
elsif (/^:[0-7]+ [0-7]+ [0-9a-f]+ [0-9a-f]+ (.) (.*)$/) {
$file = unquote_path($2);
if (!exists $data{$file}) {
$data{$file} = +{
INDEX => 'unchanged',
BINARY => 0,
};
}
if ($1 eq 'U') {
$data{$file}{UNMERGED} = 1;
}
}
}

for (sort keys %data) {
my $it = $data{$_};

if ($only) {
if ($only eq 'index-only') {
next if ($it->{INDEX} eq 'unchanged');
}
if ($only eq 'file-only') {
next if ($it->{FILE} eq 'nothing');
}
}
push @return, +{
VALUE => $_,
%$it,
};
}
return @return;
}

sub find_unique {
my ($string, @stuff) = @_;
my $found = undef;
for (my $i = 0; $i < @stuff; $i++) {
my $it = $stuff[$i];
my $hit = undef;
if (ref $it) {
if ((ref $it) eq 'ARRAY') {
$it = $it->[0];
}
else {
$it = $it->{VALUE};
}
}
eval {
if ($it =~ /^$string/) {
$hit = 1;
};
};
if (defined $hit && defined $found) {
return undef;
}
if ($hit) {
$found = $i + 1;
}
}
return $found;
}

# inserts string into trie and updates count for each character
sub update_trie {
my ($trie, $string) = @_;
foreach (split //, $string) {
$trie = $trie->{$_} ||= {COUNT => 0};
$trie->{COUNT}++;
}
}

# returns an array of tuples (prefix, remainder)
sub find_unique_prefixes {
my @stuff = @_;
my @return = ();

# any single prefix exceeding the soft limit is omitted
# if any prefix exceeds the hard limit all are omitted
# 0 indicates no limit
my $soft_limit = 0;
my $hard_limit = 3;

# build a trie modelling all possible options
my %trie;
foreach my $print (@stuff) {
if ((ref $print) eq 'ARRAY') {
$print = $print->[0];
}
elsif ((ref $print) eq 'HASH') {
$print = $print->{VALUE};
}
update_trie(\%trie, $print);
push @return, $print;
}

# use the trie to find the unique prefixes
for (my $i = 0; $i < @return; $i++) {
my $ret = $return[$i];
my @letters = split //, $ret;
my %search = %trie;
my ($prefix, $remainder);
my $j;
for ($j = 0; $j < @letters; $j++) {
my $letter = $letters[$j];
if ($search{$letter}{COUNT} == 1) {
$prefix = substr $ret, 0, $j + 1;
$remainder = substr $ret, $j + 1;
last;
}
else {
my $prefix = substr $ret, 0, $j;
return ()
if ($hard_limit && $j + 1 > $hard_limit);
}
%search = %{$search{$letter}};
}
if (ord($letters[0]) > 127 ||
($soft_limit && $j + 1 > $soft_limit)) {
$prefix = undef;
$remainder = $ret;
}
$return[$i] = [$prefix, $remainder];
}
return @return;
}

# filters out prefixes which have special meaning to list_and_choose()
sub is_valid_prefix {
my $prefix = shift;
return (defined $prefix) &&
!($prefix =~ /[\s,]/) && # separators
!($prefix =~ /^-/) && # deselection
!($prefix =~ /^\d+/) && # selection
($prefix ne '*') && # "all" wildcard
($prefix ne '?'); # prompt help
}

# given a prefix/remainder tuple return a string with the prefix highlighted
# for now use square brackets; later might use ANSI colors (underline, bold)
sub highlight_prefix {
my $prefix = shift;
my $remainder = shift;

if (!defined $prefix) {
return $remainder;
}

if (!is_valid_prefix($prefix)) {
return "$prefix$remainder";
}

if (!$menu_use_color) {
return "[$prefix]$remainder";
}

return "$prompt_color$prefix$normal_color$remainder";
}

sub error_msg {
print STDERR colored $error_color, @_;
}

sub list_and_choose {
my ($opts, @stuff) = @_;
my (@chosen, @return);
my $i;
my @prefixes = find_unique_prefixes(@stuff) unless $opts->{LIST_ONLY};

      TOPLOOP:
while (1) {
my $last_lf = 0;

if ($opts->{HEADER}) {
if (!$opts->{LIST_FLAT}) {
print " ";
}
print colored $header_color, "$opts->{HEADER}\n";
}
for ($i = 0; $i < @stuff; $i++) {
my $chosen = $chosen[$i] ? '*' : ' ';
my $print = $stuff[$i];
my $ref = ref $print;
my $highlighted = highlight_prefix(@{$prefixes[$i]})
if @prefixes;
if ($ref eq 'ARRAY') {
$print = $highlighted || $print->[0];
}
elsif ($ref eq 'HASH') {
my $value = $highlighted || $print->{VALUE};
$print = sprintf($status_fmt,
$print->{INDEX},
$print->{FILE},
$value);
}
else {
$print = $highlighted || $print;
}
printf("%s%2d: %s", $chosen, $i+1, $print);
if (($opts->{LIST_FLAT}) &&
(($i + 1) % ($opts->{LIST_FLAT}))) {
print "\t";
$last_lf = 0;
}
else {
print "\n";
$last_lf = 1;
}
}
if (!$last_lf) {
print "\n";
}

return if ($opts->{LIST_ONLY});

print colored $prompt_color, $opts->{PROMPT};
if ($opts->{SINGLETON}) {
print "> ";
}
else {
print ">> ";
}
my $line = <STDIN>;
if (!$line) {
print "\n";
$opts->{ON_EOF}->() if $opts->{ON_EOF};
last;
}
chomp $line;
last if $line eq '';
if ($line eq '?') {
$opts->{SINGLETON} ?
singleton_prompt_help_cmd() :
prompt_help_cmd();
next TOPLOOP;
}
for my $choice (split(/[\s,]+/, $line)) {
my $choose = 1;
my ($bottom, $top);

# Input that begins with '-'; unchoose
if ($choice =~ s/^-//) {
$choose = 0;
}
# A range can be specified like 5-7 or 5-.
if ($choice =~ /^(\d+)-(\d*)$/) {
($bottom, $top) = ($1, length($2) ? $2 : 1 + @stuff);
}
elsif ($choice =~ /^\d+$/) {
$bottom = $top = $choice;
}
elsif ($choice eq '*') {
$bottom = 1;
$top = 1 + @stuff;
}
else {
$bottom = $top = find_unique($choice, @stuff);
if (!defined $bottom) {
error_msg "Huh ($choice)?\n";
next TOPLOOP;
}
}
if ($opts->{SINGLETON} && $bottom != $top) {
error_msg "Huh ($choice)?\n";
next TOPLOOP;
}
for ($i = $bottom-1; $i <= $top-1; $i++) {
next if (@stuff <= $i || $i < 0);
$chosen[$i] = $choose;
}
}
last if ($opts->{IMMEDIATE} || $line eq '*');
}
for ($i = 0; $i < @stuff; $i++) {
if ($chosen[$i]) {
push @return, $stuff[$i];
}
}
return @return;
}

sub singleton_prompt_help_cmd {
print colored $help_color, <<\EOF ;
Prompt help:
1 - select a numbered item
foo - select item based on unique prefix
           - (empty) select nothing
EOF
}

sub prompt_help_cmd {
print colored $help_color, <<\EOF ;
Prompt help:
1 - select a single item
3-5 - select a range of items
2-3,6-9 - select multiple ranges
foo - select item based on unique prefix
-... - unselect specified items
* - choose all items
           - (empty) finish selecting
EOF
}

sub status_cmd {
list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
list_modified());
print "\n";
}

sub say_n_paths {
my $did = shift @_;
my $cnt = scalar @_;
print "$did ";
if (1 < $cnt) {
print "$cnt paths\n";
}
else {
print "one path\n";
}
}

sub update_cmd {
my @mods = list_modified('file-only');
return if (!@mods);

my @update = list_and_choose({ PROMPT => 'Update',
HEADER => $status_head, },
@mods);
if (@update) {
system(qw(git update-index --add --remove --),
map { $_->{VALUE} } @update);
say_n_paths('updated', @update);
}
print "\n";
}

sub revert_cmd {
my @update = list_and_choose({ PROMPT => 'Revert',
HEADER => $status_head, },
list_modified());
if (@update) {
if (is_initial_commit()) {
system(qw(git rm --cached),
map { $_->{VALUE} } @update);
}
else {
my @lines = run_cmd_pipe(qw(git ls-tree HEAD --),
map { $_->{VALUE} } @update);
my $fh;
open $fh, '| git update-index --index-info'
or die;
for (@lines) {
print $fh $_;
}
close($fh);
for (@update) {
if ($_->{INDEX_ADDDEL} &&
$_->{INDEX_ADDDEL} eq 'create') {
system(qw(git update-index --force-remove --),
$_->{VALUE});
print "note: $_->{VALUE} is untracked now.\n";
}
}
}
refresh();
say_n_paths('reverted', @update);
}
print "\n";
}

sub add_untracked_cmd {
my @add = list_and_choose({ PROMPT => 'Add untracked' },
list_untracked());
if (@add) {
system(qw(git update-index --add --), @add);
say_n_paths('added', @add);
}
print "\n";
}

sub run_git_apply {
my $cmd = shift;
my $fh;
open $fh, '| git ' . $cmd . " --recount --allow-overlap";
print $fh @_;
return close $fh;
}

sub parse_diff {
my ($path) = @_;
my @diff_cmd = split(" ", $patch_mode_flavour{DIFF});
if (defined $patch_mode_revision) {
push @diff_cmd, $patch_mode_revision;
}
my @diff = run_cmd_pipe("git", @diff_cmd, "--", $path);
my @colored = ();
if ($diff_use_color) {
@colored = run_cmd_pipe("git", @diff_cmd, qw(--color --), $path);
}
my (@hunk) = { TEXT => [], DISPLAY => [], TYPE => 'header' };

for (my $i = 0; $i < @diff; $i++) {
if ($diff[$i] =~ /^@@ /) {
push @hunk, { TEXT => [], DISPLAY => [],
TYPE => 'hunk' };
}
push @{$hunk[-1]{TEXT}}, $diff[$i];
push @{$hunk[-1]{DISPLAY}},
($diff_use_color ? $colored[$i] : $diff[$i]);
}
return @hunk;
}

sub parse_diff_header {
my $src = shift;

my $head = { TEXT => [], DISPLAY => [], TYPE => 'header' };
my $mode = { TEXT => [], DISPLAY => [], TYPE => 'mode' };
my $deletion = { TEXT => [], DISPLAY => [], TYPE => 'deletion' };

for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
my $dest =
$src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ? $mode :
$src->{TEXT}->[$i] =~ /^deleted file/ ? $deletion :
$head;
push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
}
return ($head, $mode, $deletion);
}

sub hunk_splittable {
my ($text) = @_;

my @s = split_hunk($text);
return (1 < @s);
}

sub parse_hunk_header {
my ($line) = @_;
my ($o_ofs, $o_cnt, $n_ofs, $n_cnt) =
$line =~ /^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/;
$o_cnt = 1 unless defined $o_cnt;
$n_cnt = 1 unless defined $n_cnt;
return ($o_ofs, $o_cnt, $n_ofs, $n_cnt);
}

sub split_hunk {
my ($text, $display) = @_;
my @split = ();
if (!defined $display) {
$display = $text;
}
# If there are context lines in the middle of a hunk,
# it can be split, but we would need to take care of
# overlaps later.

my ($o_ofs, undef, $n_ofs) = parse_hunk_header($text->[0]);
my $hunk_start = 1;

      OUTER:
while (1) {
my $next_hunk_start = undef;
my $i = $hunk_start - 1;
my $this = +{
TEXT => [],
DISPLAY => [],
TYPE => 'hunk',
OLD => $o_ofs,
NEW => $n_ofs,
OCNT => 0,
NCNT => 0,
ADDDEL => 0,
POSTCTX => 0,
USE => undef,
};

while (++$i < @$text) {
my $line = $text->[$i];
my $display = $display->[$i];
if ($line =~ /^ /) {
if ($this->{ADDDEL} &&
!defined $next_hunk_start) {
# We have seen leading context and
# adds/dels and then here is another
# context, which is trailing for this
# split hunk and leading for the next
# one.
$next_hunk_start = $i;
}
push @{$this->{TEXT}}, $line;
push @{$this->{DISPLAY}}, $display;
$this->{OCNT}++;
$this->{NCNT}++;
if (defined $next_hunk_start) {
$this->{POSTCTX}++;
}
next;
}

# add/del
if (defined $next_hunk_start) {
# We are done with the current hunk and
# this is the first real change for the
# next split one.
$hunk_start = $next_hunk_start;
$o_ofs = $this->{OLD} + $this->{OCNT};
$n_ofs = $this->{NEW} + $this->{NCNT};
$o_ofs -= $this->{POSTCTX};
$n_ofs -= $this->{POSTCTX};
push @split, $this;
redo OUTER;
}
push @{$this->{TEXT}}, $line;
push @{$this->{DISPLAY}}, $display;
$this->{ADDDEL}++;
if ($line =~ /^-/) {
$this->{OCNT}++;
}
else {
$this->{NCNT}++;
}
}

push @split, $this;
last;
}

for my $hunk (@split) {
$o_ofs = $hunk->{OLD};
$n_ofs = $hunk->{NEW};
my $o_cnt = $hunk->{OCNT};
my $n_cnt = $hunk->{NCNT};

my $head = ("@@ -$o_ofs" .
(($o_cnt != 1) ? ",$o_cnt" : '') .
" +$n_ofs" .
(($n_cnt != 1) ? ",$n_cnt" : '') .
" @@\n");
my $display_head = $head;
unshift @{$hunk->{TEXT}}, $head;
if ($diff_use_color) {
$display_head = colored($fraginfo_color, $head);
}
unshift @{$hunk->{DISPLAY}}, $display_head;
}
return @split;
}

sub find_last_o_ctx {
my ($it) = @_;
my $text = $it->{TEXT};
my ($o_ofs, $o_cnt) = parse_hunk_header($text->[0]);
my $i = @{$text};
my $last_o_ctx = $o_ofs + $o_cnt;
while (0 < --$i) {
my $line = $text->[$i];
if ($line =~ /^ /) {
$last_o_ctx--;
next;
}
last;
}
return $last_o_ctx;
}

sub merge_hunk {
my ($prev, $this) = @_;
my ($o0_ofs, $o0_cnt, $n0_ofs, $n0_cnt) =
parse_hunk_header($prev->{TEXT}[0]);
my ($o1_ofs, $o1_cnt, $n1_ofs, $n1_cnt) =
parse_hunk_header($this->{TEXT}[0]);

my (@line, $i, $ofs, $o_cnt, $n_cnt);
$ofs = $o0_ofs;
$o_cnt = $n_cnt = 0;
for ($i = 1; $i < @{$prev->{TEXT}}; $i++) {
my $line = $prev->{TEXT}[$i];
if ($line =~ /^\+/) {
$n_cnt++;
push @line, $line;
next;
}

last if ($o1_ofs <= $ofs);

$o_cnt++;
$ofs++;
if ($line =~ /^ /) {
$n_cnt++;
}
push @line, $line;
}

for ($i = 1; $i < @{$this->{TEXT}}; $i++) {
my $line = $this->{TEXT}[$i];
if ($line =~ /^\+/) {
$n_cnt++;
push @line, $line;
next;
}
$ofs++;
$o_cnt++;
if ($line =~ /^ /) {
$n_cnt++;
}
push @line, $line;
}
my $head = ("@@ -$o0_ofs" .
(($o_cnt != 1) ? ",$o_cnt" : '') .
" +$n0_ofs" .
(($n_cnt != 1) ? ",$n_cnt" : '') .
" @@\n");
@{$prev->{TEXT}} = ($head, @line);
}

sub coalesce_overlapping_hunks {
my (@in) = @_;
my @out = ();

my ($last_o_ctx, $last_was_dirty);

for (grep { $_->{USE} } @in) {
if ($_->{TYPE} ne 'hunk') {
push @out, $_;
next;
}
my $text = $_->{TEXT};
my ($o_ofs) = parse_hunk_header($text->[0]);
if (defined $last_o_ctx &&
$o_ofs <= $last_o_ctx &&
!$_->{DIRTY} &&
!$last_was_dirty) {
merge_hunk($out[-1], $_);
}
else {
push @out, $_;
}
$last_o_ctx = find_last_o_ctx($out[-1]);
$last_was_dirty = $_->{DIRTY};
}
return @out;
}

sub reassemble_patch {
my $head = shift;
my @patch;

# Include everything in the header except the beginning of the diff.
push @patch, (grep { !/^[-+]{3}/ } @$head);

# Then include any headers from the hunk lines, which must
# come before any actual hunk.
while (@_ && $_[0] !~ /^@/) {
push @patch, shift;
}

# Then begin the diff.
push @patch, grep { /^[-+]{3}/ } @$head;

# And then the actual hunks.
push @patch, @_;

return @patch;
}

sub color_diff {
return map {
colored((/^@/ ? $fraginfo_color :
/^\+/ ? $diff_new_color :
/^-/ ? $diff_old_color :
$diff_plain_color),
$_);
} @_;
}

sub edit_hunk_manually {
my ($oldtext) = @_;

my $hunkfile = $repo->repo_path . "/addp-hunk-edit.diff";
my $fh;
open $fh, '>', $hunkfile
or die "failed to open hunk edit file for writing: " . $!;
print $fh "# Manual hunk edit mode -- see bottom for a quick guide\n";
print $fh @$oldtext;
my $participle = $patch_mode_flavour{PARTICIPLE};
my $is_reverse = $patch_mode_flavour{IS_REVERSE};
my ($remove_plus, $remove_minus) = $is_reverse ? ('-', '+') : ('+', '-');
print $fh <<EOF;
# ---
# To remove '$remove_minus' lines, make them ' ' lines (context).
# To remove '$remove_plus' lines, delete them.
# Lines starting with # will be removed.
#
# If the patch applies cleanly, the edited hunk will immediately be
# marked for $participle. If it does not apply cleanly, you will be given
# an opportunity to edit again. If all lines of the hunk are removed,
# then the edit is aborted and the hunk is left unchanged.
EOF
close $fh;

chomp(my $editor = run_cmd_pipe(qw(git var GIT_EDITOR)));
system('sh', '-c', $editor.' "$@"', $editor, $hunkfile);

if ($? != 0) {
return undef;
}

open $fh, '<', $hunkfile
or die "failed to open hunk edit file for reading: " . $!;
my @newtext = grep { !/^#/ } <$fh>;
close $fh;
unlink $hunkfile;

# Abort if nothing remains
if (!grep { /\S/ } @newtext) {
return undef;
}

# Reinsert the first hunk header if the user accidentally deleted it
if ($newtext[0] !~ /^@/) {
unshift @newtext, $oldtext->[0];
}
return \@newtext;
}

sub diff_applies {
my $fh;
return run_git_apply($patch_mode_flavour{APPLY_CHECK} . ' --check',
map { @{$_->{TEXT}} } @_);
}

sub _restore_terminal_and_die {
ReadMode 'restore';
print "\n";
exit 1;
}

sub prompt_single_character {
if ($use_readkey) {
local $SIG{TERM} = \&_restore_terminal_and_die;
local $SIG{INT} = \&_restore_terminal_and_die;
ReadMode 'cbreak';
my $key = ReadKey 0;
ReadMode 'restore';
if ($use_termcap and $key eq "\e") {
while (!defined $term_escapes{$key}) {
my $next = ReadKey 0.5;
last if (!defined $next);
$key .= $next;
}
$key =~ s/\e/^[/;
}
print "$key" if defined $key;
print "\n";
return $key;
} else {
return <STDIN>;
}
}

sub prompt_yesno {
my ($prompt) = @_;
while (1) {
print colored $prompt_color, $prompt;
my $line = prompt_single_character;
return 0 if $line =~ /^n/i;
return 1 if $line =~ /^y/i;
}
}

sub edit_hunk_loop {
my ($head, $hunk, $ix) = @_;
my $text = $hunk->[$ix]->{TEXT};

while (1) {
$text = edit_hunk_manually($text);
if (!defined $text) {
return undef;
}
my $newhunk = {
TEXT => $text,
TYPE => $hunk->[$ix]->{TYPE},
USE => 1,
DIRTY => 1,
};
if (diff_applies($head,
@{$hunk}[0..$ix-1],
$newhunk,
@{$hunk}[$ix+1..$#{$hunk}])) {
$newhunk->{DISPLAY} = [color_diff(@{$text})];
return $newhunk;
}
else {
prompt_yesno(
'Your edited hunk does not apply. Edit again '
. '(saying "no" discards!) [y/n]? '
) or return undef;
}
}
}

sub help_patch_cmd {
my $verb = lc $patch_mode_flavour{VERB};
my $target = $patch_mode_flavour{TARGET};
print colored $help_color, <<EOF ;
y - $verb this hunk$target
n - do not $verb this hunk$target
q - quit; do not $verb this hunk nor any of the remaining ones
a - $verb this hunk and all later hunks in the file
d - do not $verb this hunk nor any of the later hunks in the file
g - select a hunk to go to
/ - search for a hunk matching the given regex
j - leave this hunk undecided, see next undecided hunk
J - leave this hunk undecided, see next hunk
k - leave this hunk undecided, see previous undecided hunk
K - leave this hunk undecided, see previous hunk
s - split the current hunk into smaller hunks
e - manually edit the current hunk
? - print help
EOF
}

sub apply_patch {
my $cmd = shift;
my $ret = run_git_apply $cmd, @_;
if (!$ret) {
print STDERR @_;
}
return $ret;
}

sub apply_patch_for_checkout_commit {
my $reverse = shift;
my $applies_index = run_git_apply 'apply '.$reverse.' --cached --check', @_;
my $applies_worktree = run_git_apply 'apply '.$reverse.' --check', @_;

if ($applies_worktree && $applies_index) {
run_git_apply 'apply '.$reverse.' --cached', @_;
run_git_apply 'apply '.$reverse, @_;
return 1;
} elsif (!$applies_index) {
print colored $error_color, "The selected hunks do not apply to the index!\n";
if (prompt_yesno "Apply them to the worktree anyway? ") {
return run_git_apply 'apply '.$reverse, @_;
} else {
print colored $error_color, "Nothing was applied.\n";
return 0;
}
} else {
print STDERR @_;
return 0;
}
}

sub patch_update_cmd {
my @all_mods = list_modified($patch_mode_flavour{FILTER});
error_msg "ignoring unmerged: $_->{VALUE}\n"
for grep { $_->{UNMERGED} } @all_mods;
@all_mods = grep { !$_->{UNMERGED} } @all_mods;

my @mods = grep { !($_->{BINARY}) } @all_mods;
my @them;

if (!@mods) {
if (@all_mods) {
print STDERR "Only binary files changed.\n";
} else {
print STDERR "No changes.\n";
}
return 0;
}
if ($patch_mode) {
@them = @mods;
}
else {
@them = list_and_choose({ PROMPT => 'Patch update',
HEADER => $status_head, },
@mods);
}
for (@them) {
return 0 if patch_update_file($_->{VALUE});
}
}

# Generate a one line summary of a hunk.
sub summarize_hunk {
my $rhunk = shift;
my $summary = $rhunk->{TEXT}[0];

# Keep the line numbers, discard extra context.
$summary =~ s/@@(.*?)@@.*/$1 /s;
$summary .= " " x (20 - length $summary);

# Add some user context.
for my $line (@{$rhunk->{TEXT}}) {
if ($line =~ m/^[+-].*\w/) {
$summary .= $line;
last;
}
}

chomp $summary;
return substr($summary, 0, 80) . "\n";
}


# Print a one-line summary of each hunk in the array ref in
# the first argument, starting wih the index in the 2nd.
sub display_hunks {
my ($hunks, $i) = @_;
my $ctr = 0;
$i ||= 0;
for (; $i < @$hunks && $ctr < 20; $i++, $ctr++) {
my $status = " ";
if (defined $hunks->[$i]{USE}) {
$status = $hunks->[$i]{USE} ? "+" : "-";
}
printf "%s%2d: %s",
$status,
$i + 1,
summarize_hunk($hunks->[$i]);
}
return $i;
}

sub patch_update_file {
my $quit = 0;
my ($ix, $num);
my $path = shift;
my ($head, @hunk) = parse_diff($path);
($head, my $mode, my $deletion) = parse_diff_header($head);
for (@{$head->{DISPLAY}}) {
print;
}

if (@{$mode->{TEXT}}) {
unshift @hunk, $mode;
}
if (@{$deletion->{TEXT}}) {
foreach my $hunk (@hunk) {
push @{$deletion->{TEXT}}, @{$hunk->{TEXT}};
push @{$deletion->{DISPLAY}}, @{$hunk->{DISPLAY}};
}
@hunk = ($deletion);
}

$num = scalar @hunk;
$ix = 0;

while (1) {
my ($prev, $next, $other, $undecided, $i);
$other = '';

if ($num <= $ix) {
$ix = 0;
}
for ($i = 0; $i < $ix; $i++) {
if (!defined $hunk[$i]{USE}) {
$prev = 1;
$other .= ',k';
last;
}
}
if ($ix) {
$other .= ',K';
}
for ($i = $ix + 1; $i < $num; $i++) {
if (!defined $hunk[$i]{USE}) {
$next = 1;
$other .= ',j';
last;
}
}
if ($ix < $num - 1) {
$other .= ',J';
}
if ($num > 1) {
$other .= ',g';
}
for ($i = 0; $i < $num; $i++) {
if (!defined $hunk[$i]{USE}) {
$undecided = 1;
last;
}
}
last if (!$undecided);

if ($hunk[$ix]{TYPE} eq 'hunk' &&
hunk_splittable($hunk[$ix]{TEXT})) {
$other .= ',s';
}
if ($hunk[$ix]{TYPE} eq 'hunk') {
$other .= ',e';
}
for (@{$hunk[$ix]{DISPLAY}}) {
print;
}
print colored $prompt_color, $patch_mode_flavour{VERB},
($hunk[$ix]{TYPE} eq 'mode' ? ' mode change' :
$hunk[$ix]{TYPE} eq 'deletion' ? ' deletion' :
' this hunk'),
$patch_mode_flavour{TARGET},
" [y,n,q,a,d,/$other,?]? ";
my $line = prompt_single_character;
if ($line) {
if ($line =~ /^y/i) {
$hunk[$ix]{USE} = 1;
}
elsif ($line =~ /^n/i) {
$hunk[$ix]{USE} = 0;
}
elsif ($line =~ /^a/i) {
while ($ix < $num) {
if (!defined $hunk[$ix]{USE}) {
$hunk[$ix]{USE} = 1;
}
$ix++;
}
next;
}
elsif ($other =~ /g/ && $line =~ /^g(.*)/) {
my $response = $1;
my $no = $ix > 10 ? $ix - 10 : 0;
while ($response eq '') {
my $extra = "";
$no = display_hunks(\@hunk, $no);
if ($no < $num) {
$extra = " (<ret> to see more)";
}
print "go to which hunk$extra? ";
$response = <STDIN>;
if (!defined $response) {
$response = '';
}
chomp $response;
}
if ($response !~ /^\s*\d+\s*$/) {
error_msg "Invalid number: '$response'\n";
} elsif (0 < $response && $response <= $num) {
$ix = $response - 1;
} else {
error_msg "Sorry, only $num hunks available.\n";
}
next;
}
elsif ($line =~ /^d/i) {
while ($ix < $num) {
if (!defined $hunk[$ix]{USE}) {
$hunk[$ix]{USE} = 0;
}
$ix++;
}
next;
}
elsif ($line =~ /^q/i) {
for ($i = 0; $i < $num; $i++) {
if (!defined $hunk[$i]{USE}) {
$hunk[$i]{USE} = 0;
}
}
$quit = 1;
last;
}
elsif ($line =~ m|^/(.*)|) {
my $regex = $1;
if ($1 eq "") {
print colored $prompt_color, "search for regex? ";
$regex = <STDIN>;
if (defined $regex) {
chomp $regex;
}
}
my $search_string;
eval {
$search_string = qr{$regex}m;
};
if ($@) {
my ($err,$exp) = ($@, $1);
$err =~ s/ at .*git-add--interactive line \d+, <STDIN> line \d+.*$//;
error_msg "Malformed search regexp $exp: $err\n";
next;
}
my $iy = $ix;
while (1) {
my $text = join ("", @{$hunk[$iy]{TEXT}});
last if ($text =~ $search_string);
$iy++;
$iy = 0 if ($iy >= $num);
if ($ix == $iy) {
error_msg "No hunk matches the given pattern\n";
last;
}
}
$ix = $iy;
next;
}
elsif ($line =~ /^K/) {
if ($other =~ /K/) {
$ix--;
}
else {
error_msg "No previous hunk\n";
}
next;
}
elsif ($line =~ /^J/) {
if ($other =~ /J/) {
$ix++;
}
else {
error_msg "No next hunk\n";
}
next;
}
elsif ($line =~ /^k/) {
if ($other =~ /k/) {
while (1) {
$ix--;
last if (!$ix ||
!defined $hunk[$ix]{USE});
}
}
else {
error_msg "No previous hunk\n";
}
next;
}
elsif ($line =~ /^j/) {
if ($other !~ /j/) {
error_msg "No next hunk\n";
next;
}
}
elsif ($other =~ /s/ && $line =~ /^s/) {
my @split = split_hunk($hunk[$ix]{TEXT}, $hunk[$ix]{DISPLAY});
if (1 < @split) {
print colored $header_color, "Split into ",
scalar(@split), " hunks.\n";
}
splice (@hunk, $ix, 1, @split);
$num = scalar @hunk;
next;
}
elsif ($other =~ /e/ && $line =~ /^e/) {
my $newhunk = edit_hunk_loop($head, \@hunk, $ix);
if (defined $newhunk) {
splice @hunk, $ix, 1, $newhunk;
}
}
else {
help_patch_cmd($other);
next;
}
# soft increment
while (1) {
$ix++;
last if ($ix >= $num ||
!defined $hunk[$ix]{USE});
}
}
}

@hunk = coalesce_overlapping_hunks(@hunk);

my $n_lofs = 0;
my @result = ();
for (@hunk) {
if ($_->{USE}) {
push @result, @{$_->{TEXT}};
}
}

if (@result) {
my $fh;
my @patch = reassemble_patch($head->{TEXT}, @result);
my $apply_routine = $patch_mode_flavour{APPLY};
&$apply_routine(@patch);
refresh();
}

print "\n";
return $quit;
}

sub diff_cmd {
my @mods = list_modified('index-only');
@mods = grep { !($_->{BINARY}) } @mods;
return if (!@mods);
my (@them) = list_and_choose({ PROMPT => 'Review diff',
IMMEDIATE => 1,
HEADER => $status_head, },
@mods);
return if (!@them);
my $reference = is_initial_commit() ? get_empty_tree() : 'HEAD';
system(qw(git diff -p --cached), $reference, '--',
map { $_->{VALUE} } @them);
}

sub quit_cmd {
print "Bye.\n";
exit(0);
}

sub help_cmd {
print colored $help_color, <<\EOF ;
status - show paths with changes
update - add working tree state to the staged set of changes
revert - revert staged set of changes back to the HEAD version
patch - pick hunks and update selectively
diff - view diff between HEAD and index
add untracked - add contents of untracked files to the staged set of changes
EOF
}

sub process_args {
return unless @ARGV;
my $arg = shift @ARGV;
if ($arg =~ /--patch(?:=(.*))?/) {
if (defined $1) {
if ($1 eq 'reset') {
$patch_mode = 'reset_head';
$patch_mode_revision = 'HEAD';
$arg = shift @ARGV or die "missing --";
if ($arg ne '--') {
$patch_mode_revision = $arg;
$patch_mode = ($arg eq 'HEAD' ?
'reset_head' : 'reset_nothead');
$arg = shift @ARGV or die "missing --";
}
} elsif ($1 eq 'checkout') {
$arg = shift @ARGV or die "missing --";
if ($arg eq '--') {
$patch_mode = 'checkout_index';
} else {
$patch_mode_revision = $arg;
$patch_mode = ($arg eq 'HEAD' ?
'checkout_head' : 'checkout_nothead');
$arg = shift @ARGV or die "missing --";
}
} elsif ($1 eq 'stage' or $1 eq 'stash') {
$patch_mode = $1;
$arg = shift @ARGV or die "missing --";
} else {
die "unknown --patch mode: $1";
}
} else {
$patch_mode = 'stage';
$arg = shift @ARGV or die "missing --";
}
die "invalid argument $arg, expecting --"
unless $arg eq "--";
%patch_mode_flavour = %{$patch_modes{$patch_mode}};
}
elsif ($arg ne "--") {
die "invalid argument $arg, expecting --";
}
}

sub main_loop {
my @cmd = ([ 'status', \&status_cmd, ],
[ 'update', \&update_cmd, ],
[ 'revert', \&revert_cmd, ],
[ 'add untracked', \&add_untracked_cmd, ],
[ 'patch', \&patch_update_cmd, ],
[ 'diff', \&diff_cmd, ],
[ 'quit', \&quit_cmd, ],
[ 'help', \&help_cmd, ],
);
while (1) {
my ($it) = list_and_choose({ PROMPT => 'What now',
SINGLETON => 1,
LIST_FLAT => 4,
HEADER => '*** Commands ***',
ON_EOF => \&quit_cmd,
IMMEDIATE => 1 }, @cmd);
if ($it) {
eval {
$it->[1]->();
};
if ($@) {
print "$@";
}
}
}
}

process_args();
refresh();
if ($patch_mode) {
patch_update_cmd();
}
else {
status_cmd();
main_loop();
}
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