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[alt-git.git] / git-gui / lib / diff.tcl
blob30d9a797769b49cdd9d42fba925d8fa8ecbffb21
1 # git-gui diff viewer
2 # Copyright (C) 2006, 2007 Shawn Pearce
3
4 proc clear_diff {} {
5 global ui_diff current_diff_path current_diff_header
6 global ui_index ui_workdir
7
8 $ui_diff conf -state normal
9 $ui_diff delete 0.0 end
10 $ui_diff conf -state disabled
11
12 set current_diff_path {}
13 set current_diff_header {}
14
15 $ui_index tag remove in_diff 0.0 end
16 $ui_workdir tag remove in_diff 0.0 end
17 }
18
19 proc reshow_diff {{after {}}} {
20 global file_states file_lists
21 global current_diff_path current_diff_side
22 global ui_diff
23
24 set p $current_diff_path
25 if {$p eq {}} {
26 # No diff is being shown.
27 } elseif {$current_diff_side eq {}} {
28 clear_diff
29 } elseif {[catch {set s $file_states($p)}]
30 || [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} {
31
32 if {[find_next_diff $current_diff_side $p {} {[^O]}]} {
33 next_diff $after
34 } else {
35 clear_diff
36 }
37 } else {
38 set save_pos [lindex [$ui_diff yview] 0]
39 show_diff $p $current_diff_side {} $save_pos $after
40 }
41 }
42
43 proc force_diff_encoding {enc} {
44 global current_diff_path
45
46 if {$current_diff_path ne {}} {
47 force_path_encoding $current_diff_path $enc
48 reshow_diff
49 }
50 }
51
52 proc handle_empty_diff {} {
53 global current_diff_path file_states file_lists
54 global diff_empty_count
55
56 set path $current_diff_path
57 set s $file_states($path)
58 if {[lindex $s 0] ne {_M} || [has_textconv $path]} return
59
60 # Prevent infinite rescan loops
61 incr diff_empty_count
62 if {$diff_empty_count > 1} return
63
64 info_popup [mc "No differences detected.
65
66 %s has no changes.
67
68 The modification date of this file was updated by another application, but the content within the file was not changed.
69
70 A rescan will be automatically started to find other files which may have the same state." [short_path $path]]
71
72 clear_diff
73 display_file $path __
74 rescan ui_ready 0
75 }
76
77 proc show_diff {path w {lno {}} {scroll_pos {}} {callback {}}} {
78 global file_states file_lists
79 global is_3way_diff is_conflict_diff diff_active repo_config
80 global ui_diff ui_index ui_workdir
81 global current_diff_path current_diff_side current_diff_header
82 global current_diff_queue
83
84 if {$diff_active || ![lock_index read]} return
85
86 clear_diff
87 if {$lno == {}} {
88 set lno [lsearch -sorted -exact $file_lists($w) $path]
89 if {$lno >= 0} {
90 incr lno
91 }
92 }
93 if {$lno >= 1} {
94 $w tag add in_diff $lno.0 [expr {$lno + 1}].0
95 $w see $lno.0
96 }
97
98 set s $file_states($path)
99 set m [lindex $s 0]
100 set is_conflict_diff 0
101 set current_diff_path $path
102 set current_diff_side $w
103 set current_diff_queue {}
104 ui_status [mc "Loading diff of %s..." [escape_path $path]]
105
106 set cont_info [list $scroll_pos $callback]
107
108 if {[string first {U} $m] >= 0} {
109 merge_load_stages $path [list show_unmerged_diff $cont_info]
110 } elseif {$m eq {_O}} {
111 show_other_diff $path $w $m $cont_info
112 } else {
113 start_show_diff $cont_info
114 }
115 }
116
117 proc show_unmerged_diff {cont_info} {
118 global current_diff_path current_diff_side
119 global merge_stages ui_diff is_conflict_diff
120 global current_diff_queue
121
122 if {$merge_stages(2) eq {}} {
123 set is_conflict_diff 1
124 lappend current_diff_queue \
125 [list [mc "LOCAL: deleted\nREMOTE:\n"] d= \
126 [list ":1:$current_diff_path" ":3:$current_diff_path"]]
127 } elseif {$merge_stages(3) eq {}} {
128 set is_conflict_diff 1
129 lappend current_diff_queue \
130 [list [mc "REMOTE: deleted\nLOCAL:\n"] d= \
131 [list ":1:$current_diff_path" ":2:$current_diff_path"]]
132 } elseif {[lindex $merge_stages(1) 0] eq {120000}
133 || [lindex $merge_stages(2) 0] eq {120000}
134 || [lindex $merge_stages(3) 0] eq {120000}} {
135 set is_conflict_diff 1
136 lappend current_diff_queue \
137 [list [mc "LOCAL:\n"] d= \
138 [list ":1:$current_diff_path" ":2:$current_diff_path"]]
139 lappend current_diff_queue \
140 [list [mc "REMOTE:\n"] d= \
141 [list ":1:$current_diff_path" ":3:$current_diff_path"]]
142 } else {
143 start_show_diff $cont_info
144 return
145 }
146
147 advance_diff_queue $cont_info
148 }
149
150 proc advance_diff_queue {cont_info} {
151 global current_diff_queue ui_diff
152
153 set item [lindex $current_diff_queue 0]
154 set current_diff_queue [lrange $current_diff_queue 1 end]
155
156 $ui_diff conf -state normal
157 $ui_diff insert end [lindex $item 0] [lindex $item 1]
158 $ui_diff conf -state disabled
159
160 start_show_diff $cont_info [lindex $item 2]
161 }
162
163 proc show_other_diff {path w m cont_info} {
164 global file_states file_lists
165 global is_3way_diff diff_active repo_config
166 global ui_diff ui_index ui_workdir
167 global current_diff_path current_diff_side current_diff_header
168
169 # - Git won't give us the diff, there's nothing to compare to!
170 #
171 if {$m eq {_O}} {
172 set max_sz 100000
173 set type unknown
174 if {[catch {
175 set type [file type $path]
176 switch -- $type {
177 directory {
178 set type submodule
179 set content {}
180 set sz 0
181 }
182 link {
183 set content [file readlink $path]
184 set sz [string length $content]
185 }
186 file {
187 set fd [open $path r]
188 fconfigure $fd \
189 -eofchar {} \
190 -encoding [get_path_encoding $path]
191 set content [read $fd $max_sz]
192 close $fd
193 set sz [file size $path]
194 }
195 default {
196 error "'$type' not supported"
197 }
198 }
199 } err ]} {
200 set diff_active 0
201 unlock_index
202 ui_status [mc "Unable to display %s" [escape_path $path]]
203 error_popup [strcat [mc "Error loading file:"] "\n\n$err"]
204 return
205 }
206 $ui_diff conf -state normal
207 if {$type eq {submodule}} {
208 $ui_diff insert end [append \
209 "* " \
210 [mc "Git Repository (subproject)"] \
211 "\n"] d_info
212 } elseif {![catch {set type [exec file $path]}]} {
213 set n [string length $path]
214 if {[string equal -length $n $path $type]} {
215 set type [string range $type $n end]
216 regsub {^:?\s*} $type {} type
217 }
218 $ui_diff insert end "* $type\n" d_info
219 }
220 if {[string first "\0" $content] != -1} {
221 $ui_diff insert end \
222 [mc "* Binary file (not showing content)."] \
223 d_info
224 } else {
225 if {$sz > $max_sz} {
226 $ui_diff insert end [mc \
227 "* Untracked file is %d bytes.
228 * Showing only first %d bytes.
229 " $sz $max_sz] d_info
230 }
231 $ui_diff insert end $content
232 if {$sz > $max_sz} {
233 $ui_diff insert end [mc "
234 * Untracked file clipped here by %s.
235 * To see the entire file, use an external editor.
236 " [appname]] d_info
237 }
238 }
239 $ui_diff conf -state disabled
240 set diff_active 0
241 unlock_index
242 set scroll_pos [lindex $cont_info 0]
243 if {$scroll_pos ne {}} {
244 update
245 $ui_diff yview moveto $scroll_pos
246 }
247 ui_ready
248 set callback [lindex $cont_info 1]
249 if {$callback ne {}} {
250 eval $callback
251 }
252 return
253 }
254 }
255
256 proc get_conflict_marker_size {path} {
257 set size 7
258 catch {
259 set fd_rc [eval [list git_read check-attr "conflict-marker-size" -- $path]]
260 set ret [gets $fd_rc line]
261 close $fd_rc
262 if {$ret > 0} {
263 regexp {.*: conflict-marker-size: (\d+)$} $line line size
264 }
265 }
266 return $size
267 }
268
269 proc start_show_diff {cont_info {add_opts {}}} {
270 global file_states file_lists
271 global is_3way_diff is_submodule_diff diff_active repo_config
272 global ui_diff ui_index ui_workdir
273 global current_diff_path current_diff_side current_diff_header
274
275 set path $current_diff_path
276 set w $current_diff_side
277
278 set s $file_states($path)
279 set m [lindex $s 0]
280 set is_3way_diff 0
281 set is_submodule_diff 0
282 set diff_active 1
283 set current_diff_header {}
284 set conflict_size [get_conflict_marker_size $path]
285
286 set cmd [list]
287 if {$w eq $ui_index} {
288 lappend cmd diff-index
289 lappend cmd --cached
290 } elseif {$w eq $ui_workdir} {
291 if {[string first {U} $m] >= 0} {
292 lappend cmd diff
293 } else {
294 lappend cmd diff-files
295 }
296 }
297 if {![is_config_false gui.textconv] && [git-version >= 1.6.1]} {
298 lappend cmd --textconv
299 }
300
301 if {[string match {160000 *} [lindex $s 2]]
302 || [string match {160000 *} [lindex $s 3]]} {
303 set is_submodule_diff 1
304
305 if {[git-version >= "1.6.6"]} {
306 lappend cmd --submodule
307 }
308 }
309
310 lappend cmd -p
311 lappend cmd --color
312 set cmd [concat $cmd $repo_config(gui.diffopts)]
313 if {$repo_config(gui.diffcontext) >= 1} {
314 lappend cmd "-U$repo_config(gui.diffcontext)"
315 }
316 if {$w eq $ui_index} {
317 lappend cmd [PARENT]
318 }
319 if {$add_opts ne {}} {
320 eval lappend cmd $add_opts
321 } else {
322 lappend cmd --
323 lappend cmd $path
324 }
325
326 if {$is_submodule_diff && [git-version < "1.6.6"]} {
327 if {$w eq $ui_index} {
328 set cmd [list submodule summary --cached -- $path]
329 } else {
330 set cmd [list submodule summary --files -- $path]
331 }
332 }
333
334 if {[catch {set fd [eval git_read --nice $cmd]} err]} {
335 set diff_active 0
336 unlock_index
337 ui_status [mc "Unable to display %s" [escape_path $path]]
338 error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
339 return
340 }
341
342 set ::current_diff_inheader 1
343 fconfigure $fd \
344 -blocking 0 \
345 -encoding [get_path_encoding $path] \
346 -translation lf
347 fileevent $fd readable [list read_diff $fd $conflict_size $cont_info]
348 }
349
350 proc parse_color_line {line} {
351 set start 0
352 set result ""
353 set markup [list]
354 set regexp {\033\[((?:\d+;)*\d+)?m}
355 set need_reset 0
356 while {[regexp -indices -start $start $regexp $line match code]} {
357 foreach {begin end} $match break
358 append result [string range $line $start [expr {$begin - 1}]]
359 set pos [string length $result]
360 set col [eval [linsert $code 0 string range $line]]
361 set start [incr end]
362 if {$col eq "0" || $col eq ""} {
363 if {!$need_reset} continue
364 set need_reset 0
365 } else {
366 set need_reset 1
367 }
368 lappend markup $pos $col
369 }
370 append result [string range $line $start end]
371 if {[llength $markup] < 4} {set markup {}}
372 return [list $result $markup]
373 }
374
375 proc read_diff {fd conflict_size cont_info} {
376 global ui_diff diff_active is_submodule_diff
377 global is_3way_diff is_conflict_diff current_diff_header
378 global current_diff_queue
379 global diff_empty_count
380
381 $ui_diff conf -state normal
382 while {[gets $fd line] >= 0} {
383 foreach {line markup} [parse_color_line $line] break
384 set line [string map {\033 ^} $line]
385
386 set tags {}
387
388 # -- Check for start of diff header.
389 if { [string match {diff --git *} $line]
390 || [string match {diff --cc *} $line]
391 || [string match {diff --combined *} $line]} {
392 set ::current_diff_inheader 1
393 }
394
395 # -- Check for end of diff header (any hunk line will do this).
396 #
397 if {[regexp {^@@+ } $line]} {set ::current_diff_inheader 0}
398
399 # -- Automatically detect if this is a 3 way diff.
400 #
401 if {[string match {@@@ *} $line]} {set is_3way_diff 1}
402
403 if {$::current_diff_inheader} {
404
405 # -- These two lines stop a diff header and shouldn't be in there
406 if { [string match {Binary files * and * differ} $line]
407 || [regexp {^\* Unmerged path } $line]} {
408 set ::current_diff_inheader 0
409 } else {
410 append current_diff_header $line "\n"
411 }
412
413 # -- Cleanup uninteresting diff header lines.
414 #
415 if { [string match {diff --git *} $line]
416 || [string match {diff --cc *} $line]
417 || [string match {diff --combined *} $line]
418 || [string match {--- *} $line]
419 || [string match {+++ *} $line]
420 || [string match {index *} $line]} {
421 continue
422 }
423
424 # -- Name it symlink, not 120000
425 # Note, that the original line is in $current_diff_header
426 regsub {^(deleted|new) file mode 120000} $line {\1 symlink} line
427
428 } elseif { $line eq {\ No newline at end of file}} {
429 # -- Handle some special lines
430 } elseif {$is_3way_diff} {
431 set op [string range $line 0 1]
432 switch -- $op {
433 { } {set tags {}}
434 {@@} {set tags d_@}
435 { +} {set tags d_s+}
436 { -} {set tags d_s-}
437 {+ } {set tags d_+s}
438 {- } {set tags d_-s}
439 {--} {set tags d_--}
440 {++} {
441 set regexp [string map [list %conflict_size $conflict_size]\
442 {^\+\+([<>=]){%conflict_size}(?: |$)}]
443 if {[regexp $regexp $line _g op]} {
444 set is_conflict_diff 1
445 set line [string replace $line 0 1 { }]
446 set tags d$op
447 } else {
448 set tags d_++
449 }
450 }
451 default {
452 puts "error: Unhandled 3 way diff marker: {$op}"
453 set tags {}
454 }
455 }
456 } elseif {$is_submodule_diff} {
457 if {$line == ""} continue
458 if {[regexp {^Submodule } $line]} {
459 set tags d_info
460 } elseif {[regexp {^\* } $line]} {
461 set line [string replace $line 0 1 {Submodule }]
462 set tags d_info
463 } else {
464 set op [string range $line 0 2]
465 switch -- $op {
466 { <} {set tags d_-}
467 { >} {set tags d_+}
468 { W} {set tags {}}
469 default {
470 puts "error: Unhandled submodule diff marker: {$op}"
471 set tags {}
472 }
473 }
474 }
475 } else {
476 set op [string index $line 0]
477 switch -- $op {
478 { } {set tags {}}
479 {@} {set tags d_@}
480 {-} {set tags d_-}
481 {+} {
482 set regexp [string map [list %conflict_size $conflict_size]\
483 {^\+([<>=]){%conflict_size}(?: |$)}]
484 if {[regexp $regexp $line _g op]} {
485 set is_conflict_diff 1
486 set tags d$op
487 } else {
488 set tags d_+
489 }
490 }
491 default {
492 puts "error: Unhandled 2 way diff marker: {$op}"
493 set tags {}
494 }
495 }
496 }
497 set mark [$ui_diff index "end - 1 line linestart"]
498 $ui_diff insert end $line $tags
499 if {[string index $line end] eq "\r"} {
500 $ui_diff tag add d_cr {end - 2c}
501 }
502 $ui_diff insert end "\n" $tags
503
504 foreach {posbegin colbegin posend colend} $markup {
505 set prefix clr
506 foreach style [lsort -integer [split $colbegin ";"]] {
507 if {$style eq "7"} {append prefix i; continue}
508 if {$style != 4 && ($style < 30 || $style > 47)} {continue}
509 set a "$mark linestart + $posbegin chars"
510 set b "$mark linestart + $posend chars"
511 catch {$ui_diff tag add $prefix$style $a $b}
512 }
513 }
514 }
515 $ui_diff conf -state disabled
516
517 if {[eof $fd]} {
518 close $fd
519
520 if {$current_diff_queue ne {}} {
521 advance_diff_queue $cont_info
522 return
523 }
524
525 set diff_active 0
526 unlock_index
527 set scroll_pos [lindex $cont_info 0]
528 if {$scroll_pos ne {}} {
529 update
530 $ui_diff yview moveto $scroll_pos
531 }
532 ui_ready
533
534 if {[$ui_diff index end] eq {2.0}} {
535 handle_empty_diff
536 } else {
537 set diff_empty_count 0
538 }
539
540 set callback [lindex $cont_info 1]
541 if {$callback ne {}} {
542 eval $callback
543 }
544 }
545 }
546
547 proc apply_hunk {x y} {
548 global current_diff_path current_diff_header current_diff_side
549 global ui_diff ui_index file_states
550
551 if {$current_diff_path eq {} || $current_diff_header eq {}} return
552 if {![lock_index apply_hunk]} return
553
554 set apply_cmd {apply --cached --whitespace=nowarn}
555 set mi [lindex $file_states($current_diff_path) 0]
556 if {$current_diff_side eq $ui_index} {
557 set failed_msg [mc "Failed to unstage selected hunk."]
558 lappend apply_cmd --reverse
559 if {[string index $mi 0] ne {M}} {
560 unlock_index
561 return
562 }
563 } else {
564 set failed_msg [mc "Failed to stage selected hunk."]
565 if {[string index $mi 1] ne {M}} {
566 unlock_index
567 return
568 }
569 }
570
571 set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
572 set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
573 if {$s_lno eq {}} {
574 unlock_index
575 return
576 }
577
578 set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
579 if {$e_lno eq {}} {
580 set e_lno end
581 }
582
583 if {[catch {
584 set enc [get_path_encoding $current_diff_path]
585 set p [eval git_write $apply_cmd]
586 fconfigure $p -translation binary -encoding $enc
587 puts -nonewline $p $current_diff_header
588 puts -nonewline $p [$ui_diff get $s_lno $e_lno]
589 close $p} err]} {
590 error_popup [append $failed_msg "\n\n$err"]
591 unlock_index
592 return
593 }
594
595 $ui_diff conf -state normal
596 $ui_diff delete $s_lno $e_lno
597 $ui_diff conf -state disabled
598
599 if {[$ui_diff get 1.0 end] eq "\n"} {
600 set o _
601 } else {
602 set o ?
603 }
604
605 if {$current_diff_side eq $ui_index} {
606 set mi ${o}M
607 } elseif {[string index $mi 0] eq {_}} {
608 set mi M$o
609 } else {
610 set mi ?$o
611 }
612 unlock_index
613 display_file $current_diff_path $mi
614 # This should trigger shift to the next changed file
615 if {$o eq {_}} {
616 reshow_diff
617 }
618 }
619
620 proc apply_range_or_line {x y} {
621 global current_diff_path current_diff_header current_diff_side
622 global ui_diff ui_index file_states
623
624 set selected [$ui_diff tag nextrange sel 0.0]
625
626 if {$selected == {}} {
627 set first [$ui_diff index "@$x,$y"]
628 set last $first
629 } else {
630 set first [lindex $selected 0]
631 set last [lindex $selected 1]
632 }
633
634 set first_l [$ui_diff index "$first linestart"]
635 set last_l [$ui_diff index "$last lineend"]
636
637 if {$current_diff_path eq {} || $current_diff_header eq {}} return
638 if {![lock_index apply_hunk]} return
639
640 set apply_cmd {apply --cached --whitespace=nowarn}
641 set mi [lindex $file_states($current_diff_path) 0]
642 if {$current_diff_side eq $ui_index} {
643 set failed_msg [mc "Failed to unstage selected line."]
644 set to_context {+}
645 lappend apply_cmd --reverse
646 if {[string index $mi 0] ne {M}} {
647 unlock_index
648 return
649 }
650 } else {
651 set failed_msg [mc "Failed to stage selected line."]
652 set to_context {-}
653 if {[string index $mi 1] ne {M}} {
654 unlock_index
655 return
656 }
657 }
658
659 set wholepatch {}
660
661 while {$first_l < $last_l} {
662 set i_l [$ui_diff search -backwards -regexp ^@@ $first_l 0.0]
663 if {$i_l eq {}} {
664 # If there's not a @@ above, then the selected range
665 # must have come before the first_l @@
666 set i_l [$ui_diff search -regexp ^@@ $first_l $last_l]
667 }
668 if {$i_l eq {}} {
669 unlock_index
670 return
671 }
672 # $i_l is now at the beginning of a line
673
674 # pick start line number from hunk header
675 set hh [$ui_diff get $i_l "$i_l + 1 lines"]
676 set hh [lindex [split $hh ,] 0]
677 set hln [lindex [split $hh -] 1]
678
679 # There is a special situation to take care of. Consider this
680 # hunk:
681 #
682 # @@ -10,4 +10,4 @@
683 # context before
684 # -old 1
685 # -old 2
686 # +new 1
687 # +new 2
688 # context after
689 #
690 # We used to keep the context lines in the order they appear in
691 # the hunk. But then it is not possible to correctly stage only
692 # "-old 1" and "+new 1" - it would result in this staged text:
693 #
694 # context before
695 # old 2
696 # new 1
697 # context after
698 #
699 # (By symmetry it is not possible to *un*stage "old 2" and "new
700 # 2".)
701 #
702 # We resolve the problem by introducing an asymmetry, namely,
703 # when a "+" line is *staged*, it is moved in front of the
704 # context lines that are generated from the "-" lines that are
705 # immediately before the "+" block. That is, we construct this
706 # patch:
707 #
708 # @@ -10,4 +10,5 @@
709 # context before
710 # +new 1
711 # old 1
712 # old 2
713 # context after
714 #
715 # But we do *not* treat "-" lines that are *un*staged in a
716 # special way.
717 #
718 # With this asymmetry it is possible to stage the change "old
719 # 1" -> "new 1" directly, and to stage the change "old 2" ->
720 # "new 2" by first staging the entire hunk and then unstaging
721 # the change "old 1" -> "new 1".
722 #
723 # Applying multiple lines adds complexity to the special
724 # situation. The pre_context must be moved after the entire
725 # first block of consecutive staged "+" lines, so that
726 # staging both additions gives the following patch:
727 #
728 # @@ -10,4 +10,6 @@
729 # context before
730 # +new 1
731 # +new 2
732 # old 1
733 # old 2
734 # context after
735
736 # This is non-empty if and only if we are _staging_ changes;
737 # then it accumulates the consecutive "-" lines (after
738 # converting them to context lines) in order to be moved after
739 # "+" change lines.
740 set pre_context {}
741
742 set n 0
743 set m 0
744 set i_l [$ui_diff index "$i_l + 1 lines"]
745 set patch {}
746 while {[$ui_diff compare $i_l < "end - 1 chars"] &&
747 [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
748 set next_l [$ui_diff index "$i_l + 1 lines"]
749 set c1 [$ui_diff get $i_l]
750 if {[$ui_diff compare $first_l <= $i_l] &&
751 [$ui_diff compare $i_l < $last_l] &&
752 ($c1 eq {-} || $c1 eq {+})} {
753 # a line to stage/unstage
754 set ln [$ui_diff get $i_l $next_l]
755 if {$c1 eq {-}} {
756 set n [expr $n+1]
757 set patch "$patch$pre_context$ln"
758 set pre_context {}
759 } else {
760 set m [expr $m+1]
761 set patch "$patch$ln"
762 }
763 } elseif {$c1 ne {-} && $c1 ne {+}} {
764 # context line
765 set ln [$ui_diff get $i_l $next_l]
766 set patch "$patch$pre_context$ln"
767 # Skip the "\ No newline at end of
768 # file". Depending on the locale setting
769 # we don't know what this line looks
770 # like exactly. The only thing we do
771 # know is that it starts with "\ "
772 if {![string match {\\ *} $ln]} {
773 set n [expr $n+1]
774 set m [expr $m+1]
775 }
776 set pre_context {}
777 } elseif {$c1 eq $to_context} {
778 # turn change line into context line
779 set ln [$ui_diff get "$i_l + 1 chars" $next_l]
780 if {$c1 eq {-}} {
781 set pre_context "$pre_context $ln"
782 } else {
783 set patch "$patch $ln"
784 }
785 set n [expr $n+1]
786 set m [expr $m+1]
787 } else {
788 # a change in the opposite direction of
789 # to_context which is outside the range of
790 # lines to apply.
791 set patch "$patch$pre_context"
792 set pre_context {}
793 }
794 set i_l $next_l
795 }
796 set patch "$patch$pre_context"
797 set wholepatch "$wholepatch@@ -$hln,$n +$hln,$m @@\n$patch"
798 set first_l [$ui_diff index "$next_l + 1 lines"]
799 }
800
801 if {[catch {
802 set enc [get_path_encoding $current_diff_path]
803 set p [eval git_write $apply_cmd]
804 fconfigure $p -translation binary -encoding $enc
805 puts -nonewline $p $current_diff_header
806 puts -nonewline $p $wholepatch
807 close $p} err]} {
808 error_popup [append $failed_msg "\n\n$err"]
809 }
810
811 unlock_index
812 }
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