Merge branch 'master' of https://github.com/prati0100/git-gui
[git/git.git] / git-gui / lib / diff.tcl
1 # git-gui diff viewer
2 # Copyright (C) 2006, 2007 Shawn Pearce
3
4 proc apply_tab_size {{firsttab {}}} {
5 global have_tk85 repo_config ui_diff
6
7 set w [font measure font_diff "0"]
8 if {$have_tk85 && $firsttab != 0} {
9 $ui_diff configure -tabs [list [expr {$firsttab * $w}] [expr {($firsttab + $repo_config(gui.tabsize)) * $w}]]
10 } elseif {$have_tk85 || $repo_config(gui.tabsize) != 8} {
11 $ui_diff configure -tabs [expr {$repo_config(gui.tabsize) * $w}]
12 } else {
13 $ui_diff configure -tabs {}
14 }
15 }
16
17 proc clear_diff {} {
18 global ui_diff current_diff_path current_diff_header
19 global ui_index ui_workdir
20
21 $ui_diff conf -state normal
22 $ui_diff delete 0.0 end
23 $ui_diff conf -state disabled
24
25 set current_diff_path {}
26 set current_diff_header {}
27
28 $ui_index tag remove in_diff 0.0 end
29 $ui_workdir tag remove in_diff 0.0 end
30 }
31
32 proc reshow_diff {{after {}}} {
33 global file_states file_lists
34 global current_diff_path current_diff_side
35 global ui_diff
36
37 set p $current_diff_path
38 if {$p eq {}} {
39 # No diff is being shown.
40 } elseif {$current_diff_side eq {}} {
41 clear_diff
42 } elseif {[catch {set s $file_states($p)}]
43 || [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} {
44
45 if {[find_next_diff $current_diff_side $p {} {[^O]}]} {
46 next_diff $after
47 } else {
48 clear_diff
49 }
50 } else {
51 set save_pos [lindex [$ui_diff yview] 0]
52 show_diff $p $current_diff_side {} $save_pos $after
53 }
54 }
55
56 proc force_diff_encoding {enc} {
57 global current_diff_path
58
59 if {$current_diff_path ne {}} {
60 force_path_encoding $current_diff_path $enc
61 reshow_diff
62 }
63 }
64
65 proc handle_empty_diff {} {
66 global current_diff_path file_states file_lists
67 global diff_empty_count
68
69 set path $current_diff_path
70 set s $file_states($path)
71 if {[lindex $s 0] ne {_M} || [has_textconv $path]} return
72
73 # Prevent infinite rescan loops
74 incr diff_empty_count
75 if {$diff_empty_count > 1} return
76
77 info_popup [mc "No differences detected.
78
79 %s has no changes.
80
81 The modification date of this file was updated by another application, but the content within the file was not changed.
82
83 A rescan will be automatically started to find other files which may have the same state." [short_path $path]]
84
85 clear_diff
86 display_file $path __
87 rescan ui_ready 0
88 }
89
90 proc show_diff {path w {lno {}} {scroll_pos {}} {callback {}}} {
91 global file_states file_lists
92 global is_3way_diff is_conflict_diff diff_active repo_config
93 global ui_diff ui_index ui_workdir
94 global current_diff_path current_diff_side current_diff_header
95 global current_diff_queue
96
97 if {$diff_active || ![lock_index read]} return
98
99 clear_diff
100 if {$lno == {}} {
101 set lno [lsearch -sorted -exact $file_lists($w) $path]
102 if {$lno >= 0} {
103 incr lno
104 }
105 }
106 if {$lno >= 1} {
107 $w tag add in_diff $lno.0 [expr {$lno + 1}].0
108 $w see $lno.0
109 }
110
111 set s $file_states($path)
112 set m [lindex $s 0]
113 set is_conflict_diff 0
114 set current_diff_path $path
115 set current_diff_side $w
116 set current_diff_queue {}
117 ui_status [mc "Loading diff of %s..." [escape_path $path]]
118
119 set cont_info [list $scroll_pos $callback]
120
121 apply_tab_size 0
122
123 if {[string first {U} $m] >= 0} {
124 merge_load_stages $path [list show_unmerged_diff $cont_info]
125 } elseif {$m eq {_O}} {
126 show_other_diff $path $w $m $cont_info
127 } else {
128 start_show_diff $cont_info
129 }
130
131 global current_diff_path selected_paths
132 set selected_paths($current_diff_path) 1
133 }
134
135 proc show_unmerged_diff {cont_info} {
136 global current_diff_path current_diff_side
137 global merge_stages ui_diff is_conflict_diff
138 global current_diff_queue
139
140 if {$merge_stages(2) eq {}} {
141 set is_conflict_diff 1
142 lappend current_diff_queue \
143 [list [mc "LOCAL: deleted\nREMOTE:\n"] d= \
144 [list ":1:$current_diff_path" ":3:$current_diff_path"]]
145 } elseif {$merge_stages(3) eq {}} {
146 set is_conflict_diff 1
147 lappend current_diff_queue \
148 [list [mc "REMOTE: deleted\nLOCAL:\n"] d= \
149 [list ":1:$current_diff_path" ":2:$current_diff_path"]]
150 } elseif {[lindex $merge_stages(1) 0] eq {120000}
151 || [lindex $merge_stages(2) 0] eq {120000}
152 || [lindex $merge_stages(3) 0] eq {120000}} {
153 set is_conflict_diff 1
154 lappend current_diff_queue \
155 [list [mc "LOCAL:\n"] d= \
156 [list ":1:$current_diff_path" ":2:$current_diff_path"]]
157 lappend current_diff_queue \
158 [list [mc "REMOTE:\n"] d= \
159 [list ":1:$current_diff_path" ":3:$current_diff_path"]]
160 } else {
161 start_show_diff $cont_info
162 return
163 }
164
165 advance_diff_queue $cont_info
166 }
167
168 proc advance_diff_queue {cont_info} {
169 global current_diff_queue ui_diff
170
171 set item [lindex $current_diff_queue 0]
172 set current_diff_queue [lrange $current_diff_queue 1 end]
173
174 $ui_diff conf -state normal
175 $ui_diff insert end [lindex $item 0] [lindex $item 1]
176 $ui_diff conf -state disabled
177
178 start_show_diff $cont_info [lindex $item 2]
179 }
180
181 proc show_other_diff {path w m cont_info} {
182 global file_states file_lists
183 global is_3way_diff diff_active repo_config
184 global ui_diff ui_index ui_workdir
185 global current_diff_path current_diff_side current_diff_header
186
187 # - Git won't give us the diff, there's nothing to compare to!
188 #
189 if {$m eq {_O}} {
190 set max_sz 100000
191 set type unknown
192 if {[catch {
193 set type [file type $path]
194 switch -- $type {
195 directory {
196 set type submodule
197 set content {}
198 set sz 0
199 }
200 link {
201 set content [file readlink $path]
202 set sz [string length $content]
203 }
204 file {
205 set fd [open $path r]
206 fconfigure $fd \
207 -eofchar {} \
208 -encoding [get_path_encoding $path]
209 set content [read $fd $max_sz]
210 close $fd
211 set sz [file size $path]
212 }
213 default {
214 error "'$type' not supported"
215 }
216 }
217 } err ]} {
218 set diff_active 0
219 unlock_index
220 ui_status [mc "Unable to display %s" [escape_path $path]]
221 error_popup [strcat [mc "Error loading file:"] "\n\n$err"]
222 return
223 }
224 $ui_diff conf -state normal
225 if {$type eq {submodule}} {
226 $ui_diff insert end \
227 "* [mc "Git Repository (subproject)"]\n" \
228 d_info
229 } elseif {![catch {set type [exec file $path]}]} {
230 set n [string length $path]
231 if {[string equal -length $n $path $type]} {
232 set type [string range $type $n end]
233 regsub {^:?\s*} $type {} type
234 }
235 $ui_diff insert end "* $type\n" d_info
236 }
237 if {[string first "\0" $content] != -1} {
238 $ui_diff insert end \
239 [mc "* Binary file (not showing content)."] \
240 d_info
241 } else {
242 if {$sz > $max_sz} {
243 $ui_diff insert end [mc \
244 "* Untracked file is %d bytes.
245 * Showing only first %d bytes.
246 " $sz $max_sz] d_info
247 }
248 $ui_diff insert end $content
249 if {$sz > $max_sz} {
250 $ui_diff insert end [mc "
251 * Untracked file clipped here by %s.
252 * To see the entire file, use an external editor.
253 " [appname]] d_info
254 }
255 }
256 $ui_diff conf -state disabled
257 set diff_active 0
258 unlock_index
259 set scroll_pos [lindex $cont_info 0]
260 if {$scroll_pos ne {}} {
261 update
262 $ui_diff yview moveto $scroll_pos
263 }
264 ui_ready
265 set callback [lindex $cont_info 1]
266 if {$callback ne {}} {
267 eval $callback
268 }
269 return
270 }
271 }
272
273 proc get_conflict_marker_size {path} {
274 set size 7
275 catch {
276 set fd_rc [eval [list git_read check-attr "conflict-marker-size" -- $path]]
277 set ret [gets $fd_rc line]
278 close $fd_rc
279 if {$ret > 0} {
280 regexp {.*: conflict-marker-size: (\d+)$} $line line size
281 }
282 }
283 return $size
284 }
285
286 proc start_show_diff {cont_info {add_opts {}}} {
287 global file_states file_lists
288 global is_3way_diff is_submodule_diff diff_active repo_config
289 global ui_diff ui_index ui_workdir
290 global current_diff_path current_diff_side current_diff_header
291
292 set path $current_diff_path
293 set w $current_diff_side
294
295 set s $file_states($path)
296 set m [lindex $s 0]
297 set is_3way_diff 0
298 set is_submodule_diff 0
299 set diff_active 1
300 set current_diff_header {}
301 set conflict_size [get_conflict_marker_size $path]
302
303 set cmd [list]
304 if {$w eq $ui_index} {
305 lappend cmd diff-index
306 lappend cmd --cached
307 if {[git-version >= "1.7.2"]} {
308 lappend cmd --ignore-submodules=dirty
309 }
310 } elseif {$w eq $ui_workdir} {
311 if {[string first {U} $m] >= 0} {
312 lappend cmd diff
313 } else {
314 lappend cmd diff-files
315 }
316 }
317 if {![is_config_false gui.textconv] && [git-version >= 1.6.1]} {
318 lappend cmd --textconv
319 }
320
321 if {[string match {160000 *} [lindex $s 2]]
322 || [string match {160000 *} [lindex $s 3]]} {
323 set is_submodule_diff 1
324
325 if {[git-version >= "1.6.6"]} {
326 lappend cmd --submodule
327 }
328 }
329
330 lappend cmd -p
331 lappend cmd --color
332 set cmd [concat $cmd $repo_config(gui.diffopts)]
333 if {$repo_config(gui.diffcontext) >= 1} {
334 lappend cmd "-U$repo_config(gui.diffcontext)"
335 }
336 if {$w eq $ui_index} {
337 lappend cmd [PARENT]
338 }
339 if {$add_opts ne {}} {
340 eval lappend cmd $add_opts
341 } else {
342 lappend cmd --
343 lappend cmd $path
344 }
345
346 if {$is_submodule_diff && [git-version < "1.6.6"]} {
347 if {$w eq $ui_index} {
348 set cmd [list submodule summary --cached -- $path]
349 } else {
350 set cmd [list submodule summary --files -- $path]
351 }
352 }
353
354 if {[catch {set fd [eval git_read --nice $cmd]} err]} {
355 set diff_active 0
356 unlock_index
357 ui_status [mc "Unable to display %s" [escape_path $path]]
358 error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
359 return
360 }
361
362 set ::current_diff_inheader 1
363 fconfigure $fd \
364 -blocking 0 \
365 -encoding [get_path_encoding $path] \
366 -translation lf
367 fileevent $fd readable [list read_diff $fd $conflict_size $cont_info]
368 }
369
370 proc parse_color_line {line} {
371 set start 0
372 set result ""
373 set markup [list]
374 set regexp {\033\[((?:\d+;)*\d+)?m}
375 set need_reset 0
376 while {[regexp -indices -start $start $regexp $line match code]} {
377 foreach {begin end} $match break
378 append result [string range $line $start [expr {$begin - 1}]]
379 set pos [string length $result]
380 set col [eval [linsert $code 0 string range $line]]
381 set start [incr end]
382 if {$col eq "0" || $col eq ""} {
383 if {!$need_reset} continue
384 set need_reset 0
385 } else {
386 set need_reset 1
387 }
388 lappend markup $pos $col
389 }
390 append result [string range $line $start end]
391 if {[llength $markup] < 4} {set markup {}}
392 return [list $result $markup]
393 }
394
395 proc read_diff {fd conflict_size cont_info} {
396 global ui_diff diff_active is_submodule_diff
397 global is_3way_diff is_conflict_diff current_diff_header
398 global current_diff_queue
399 global diff_empty_count
400
401 $ui_diff conf -state normal
402 while {[gets $fd line] >= 0} {
403 foreach {line markup} [parse_color_line $line] break
404 set line [string map {\033 ^} $line]
405
406 set tags {}
407
408 # -- Check for start of diff header.
409 if { [string match {diff --git *} $line]
410 || [string match {diff --cc *} $line]
411 || [string match {diff --combined *} $line]} {
412 set ::current_diff_inheader 1
413 }
414
415 # -- Check for end of diff header (any hunk line will do this).
416 #
417 if {[regexp {^@@+ } $line]} {set ::current_diff_inheader 0}
418
419 # -- Automatically detect if this is a 3 way diff.
420 #
421 if {[string match {@@@ *} $line]} {
422 set is_3way_diff 1
423 apply_tab_size 1
424 }
425
426 if {$::current_diff_inheader} {
427
428 # -- These two lines stop a diff header and shouldn't be in there
429 if { [string match {Binary files * and * differ} $line]
430 || [regexp {^\* Unmerged path } $line]} {
431 set ::current_diff_inheader 0
432 } else {
433 append current_diff_header $line "\n"
434 }
435
436 # -- Cleanup uninteresting diff header lines.
437 #
438 if { [string match {diff --git *} $line]
439 || [string match {diff --cc *} $line]
440 || [string match {diff --combined *} $line]
441 || [string match {--- *} $line]
442 || [string match {+++ *} $line]
443 || [string match {index *} $line]} {
444 continue
445 }
446
447 # -- Name it symlink, not 120000
448 # Note, that the original line is in $current_diff_header
449 regsub {^(deleted|new) file mode 120000} $line {\1 symlink} line
450
451 } elseif { $line eq {\ No newline at end of file}} {
452 # -- Handle some special lines
453 } elseif {$is_3way_diff} {
454 set op [string range $line 0 1]
455 switch -- $op {
456 { } {set tags {}}
457 {@@} {set tags d_@}
458 { +} {set tags d_s+}
459 { -} {set tags d_s-}
460 {+ } {set tags d_+s}
461 {- } {set tags d_-s}
462 {--} {set tags d_--}
463 {++} {
464 set regexp [string map [list %conflict_size $conflict_size]\
465 {^\+\+([<>=]){%conflict_size}(?: |$)}]
466 if {[regexp $regexp $line _g op]} {
467 set is_conflict_diff 1
468 set line [string replace $line 0 1 { }]
469 set tags d$op
470 } else {
471 set tags d_++
472 }
473 }
474 default {
475 puts "error: Unhandled 3 way diff marker: {$op}"
476 set tags {}
477 }
478 }
479 } elseif {$is_submodule_diff} {
480 if {$line == ""} continue
481 if {[regexp {^Submodule } $line]} {
482 set tags d_info
483 } elseif {[regexp {^\* } $line]} {
484 set line [string replace $line 0 1 {Submodule }]
485 set tags d_info
486 } else {
487 set op [string range $line 0 2]
488 switch -- $op {
489 { <} {set tags d_-}
490 { >} {set tags d_+}
491 { W} {set tags {}}
492 default {
493 puts "error: Unhandled submodule diff marker: {$op}"
494 set tags {}
495 }
496 }
497 }
498 } else {
499 set op [string index $line 0]
500 switch -- $op {
501 { } {set tags {}}
502 {@} {set tags d_@}
503 {-} {set tags d_-}
504 {+} {
505 set regexp [string map [list %conflict_size $conflict_size]\
506 {^\+([<>=]){%conflict_size}(?: |$)}]
507 if {[regexp $regexp $line _g op]} {
508 set is_conflict_diff 1
509 set tags d$op
510 } else {
511 set tags d_+
512 }
513 }
514 default {
515 puts "error: Unhandled 2 way diff marker: {$op}"
516 set tags {}
517 }
518 }
519 }
520 set mark [$ui_diff index "end - 1 line linestart"]
521 $ui_diff insert end $line $tags
522 if {[string index $line end] eq "\r"} {
523 $ui_diff tag add d_cr {end - 2c}
524 }
525 $ui_diff insert end "\n" $tags
526
527 foreach {posbegin colbegin posend colend} $markup {
528 set prefix clr
529 foreach style [lsort -integer [split $colbegin ";"]] {
530 if {$style eq "7"} {append prefix i; continue}
531 if {$style != 4 && ($style < 30 || $style > 47)} {continue}
532 set a "$mark linestart + $posbegin chars"
533 set b "$mark linestart + $posend chars"
534 catch {$ui_diff tag add $prefix$style $a $b}
535 }
536 }
537 }
538 $ui_diff conf -state disabled
539
540 if {[eof $fd]} {
541 close $fd
542
543 if {$current_diff_queue ne {}} {
544 advance_diff_queue $cont_info
545 return
546 }
547
548 set diff_active 0
549 unlock_index
550 set scroll_pos [lindex $cont_info 0]
551 if {$scroll_pos ne {}} {
552 update
553 $ui_diff yview moveto $scroll_pos
554 }
555 ui_ready
556
557 if {[$ui_diff index end] eq {2.0}} {
558 handle_empty_diff
559 } else {
560 set diff_empty_count 0
561 }
562
563 set callback [lindex $cont_info 1]
564 if {$callback ne {}} {
565 eval $callback
566 }
567 }
568 }
569
570 proc apply_or_revert_hunk {x y revert} {
571 global current_diff_path current_diff_header current_diff_side
572 global ui_diff ui_index file_states last_revert last_revert_enc
573
574 if {$current_diff_path eq {} || $current_diff_header eq {}} return
575 if {![lock_index apply_hunk]} return
576
577 set apply_cmd {apply --whitespace=nowarn}
578 set mi [lindex $file_states($current_diff_path) 0]
579 if {$current_diff_side eq $ui_index} {
580 set failed_msg [mc "Failed to unstage selected hunk."]
581 lappend apply_cmd --reverse --cached
582 if {[string index $mi 0] ne {M}} {
583 unlock_index
584 return
585 }
586 } else {
587 if {$revert} {
588 set failed_msg [mc "Failed to revert selected hunk."]
589 lappend apply_cmd --reverse
590 } else {
591 set failed_msg [mc "Failed to stage selected hunk."]
592 lappend apply_cmd --cached
593 }
594
595 if {[string index $mi 1] ne {M}} {
596 unlock_index
597 return
598 }
599 }
600
601 set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
602 set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
603 if {$s_lno eq {}} {
604 unlock_index
605 return
606 }
607
608 set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
609 if {$e_lno eq {}} {
610 set e_lno end
611 }
612
613 set wholepatch "$current_diff_header[$ui_diff get $s_lno $e_lno]"
614
615 if {[catch {
616 set enc [get_path_encoding $current_diff_path]
617 set p [eval git_write $apply_cmd]
618 fconfigure $p -translation binary -encoding $enc
619 puts -nonewline $p $wholepatch
620 close $p} err]} {
621 error_popup "$failed_msg\n\n$err"
622 unlock_index
623 return
624 }
625
626 if {$revert} {
627 # Save a copy of this patch for undoing reverts.
628 set last_revert $wholepatch
629 set last_revert_enc $enc
630 }
631
632 $ui_diff conf -state normal
633 $ui_diff delete $s_lno $e_lno
634 $ui_diff conf -state disabled
635
636 # Check if the hunk was the last one in the file.
637 if {[$ui_diff get 1.0 end] eq "\n"} {
638 set o _
639 } else {
640 set o ?
641 }
642
643 # Update the status flags.
644 if {$revert} {
645 set mi [string index $mi 0]$o
646 } elseif {$current_diff_side eq $ui_index} {
647 set mi ${o}M
648 } elseif {[string index $mi 0] eq {_}} {
649 set mi M$o
650 } else {
651 set mi ?$o
652 }
653 unlock_index
654 display_file $current_diff_path $mi
655 # This should trigger shift to the next changed file
656 if {$o eq {_}} {
657 reshow_diff
658 }
659 }
660
661 proc apply_or_revert_range_or_line {x y revert} {
662 global current_diff_path current_diff_header current_diff_side
663 global ui_diff ui_index file_states last_revert
664
665 set selected [$ui_diff tag nextrange sel 0.0]
666
667 if {$selected == {}} {
668 set first [$ui_diff index "@$x,$y"]
669 set last $first
670 } else {
671 set first [lindex $selected 0]
672 set last [lindex $selected 1]
673 }
674
675 set first_l [$ui_diff index "$first linestart"]
676 set last_l [$ui_diff index "$last lineend"]
677
678 if {$current_diff_path eq {} || $current_diff_header eq {}} return
679 if {![lock_index apply_hunk]} return
680
681 set apply_cmd {apply --whitespace=nowarn}
682 set mi [lindex $file_states($current_diff_path) 0]
683 if {$current_diff_side eq $ui_index} {
684 set failed_msg [mc "Failed to unstage selected line."]
685 set to_context {+}
686 lappend apply_cmd --reverse --cached
687 if {[string index $mi 0] ne {M}} {
688 unlock_index
689 return
690 }
691 } else {
692 if {$revert} {
693 set failed_msg [mc "Failed to revert selected line."]
694 set to_context {+}
695 lappend apply_cmd --reverse
696 } else {
697 set failed_msg [mc "Failed to stage selected line."]
698 set to_context {-}
699 lappend apply_cmd --cached
700 }
701
702 if {[string index $mi 1] ne {M}} {
703 unlock_index
704 return
705 }
706 }
707
708 set wholepatch {}
709
710 while {$first_l < $last_l} {
711 set i_l [$ui_diff search -backwards -regexp ^@@ $first_l 0.0]
712 if {$i_l eq {}} {
713 # If there's not a @@ above, then the selected range
714 # must have come before the first_l @@
715 set i_l [$ui_diff search -regexp ^@@ $first_l $last_l]
716 }
717 if {$i_l eq {}} {
718 unlock_index
719 return
720 }
721 # $i_l is now at the beginning of a line
722
723 # pick start line number from hunk header
724 set hh [$ui_diff get $i_l "$i_l + 1 lines"]
725 set hh [lindex [split $hh ,] 0]
726 set hln [lindex [split $hh -] 1]
727 set hln [lindex [split $hln " "] 0]
728
729 # There is a special situation to take care of. Consider this
730 # hunk:
731 #
732 # @@ -10,4 +10,4 @@
733 # context before
734 # -old 1
735 # -old 2
736 # +new 1
737 # +new 2
738 # context after
739 #
740 # We used to keep the context lines in the order they appear in
741 # the hunk. But then it is not possible to correctly stage only
742 # "-old 1" and "+new 1" - it would result in this staged text:
743 #
744 # context before
745 # old 2
746 # new 1
747 # context after
748 #
749 # (By symmetry it is not possible to *un*stage "old 2" and "new
750 # 2".)
751 #
752 # We resolve the problem by introducing an asymmetry, namely,
753 # when a "+" line is *staged*, it is moved in front of the
754 # context lines that are generated from the "-" lines that are
755 # immediately before the "+" block. That is, we construct this
756 # patch:
757 #
758 # @@ -10,4 +10,5 @@
759 # context before
760 # +new 1
761 # old 1
762 # old 2
763 # context after
764 #
765 # But we do *not* treat "-" lines that are *un*staged in a
766 # special way.
767 #
768 # With this asymmetry it is possible to stage the change "old
769 # 1" -> "new 1" directly, and to stage the change "old 2" ->
770 # "new 2" by first staging the entire hunk and then unstaging
771 # the change "old 1" -> "new 1".
772 #
773 # Applying multiple lines adds complexity to the special
774 # situation. The pre_context must be moved after the entire
775 # first block of consecutive staged "+" lines, so that
776 # staging both additions gives the following patch:
777 #
778 # @@ -10,4 +10,6 @@
779 # context before
780 # +new 1
781 # +new 2
782 # old 1
783 # old 2
784 # context after
785
786 # This is non-empty if and only if we are _staging_ changes;
787 # then it accumulates the consecutive "-" lines (after
788 # converting them to context lines) in order to be moved after
789 # "+" change lines.
790 set pre_context {}
791
792 set n 0
793 set m 0
794 set i_l [$ui_diff index "$i_l + 1 lines"]
795 set patch {}
796 while {[$ui_diff compare $i_l < "end - 1 chars"] &&
797 [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
798 set next_l [$ui_diff index "$i_l + 1 lines"]
799 set c1 [$ui_diff get $i_l]
800 if {[$ui_diff compare $first_l <= $i_l] &&
801 [$ui_diff compare $i_l < $last_l] &&
802 ($c1 eq {-} || $c1 eq {+})} {
803 # a line to stage/unstage
804 set ln [$ui_diff get $i_l $next_l]
805 if {$c1 eq {-}} {
806 set n [expr $n+1]
807 set patch "$patch$pre_context$ln"
808 set pre_context {}
809 } else {
810 set m [expr $m+1]
811 set patch "$patch$ln"
812 }
813 } elseif {$c1 ne {-} && $c1 ne {+}} {
814 # context line
815 set ln [$ui_diff get $i_l $next_l]
816 set patch "$patch$pre_context$ln"
817 # Skip the "\ No newline at end of
818 # file". Depending on the locale setting
819 # we don't know what this line looks
820 # like exactly. The only thing we do
821 # know is that it starts with "\ "
822 if {![string match {\\ *} $ln]} {
823 set n [expr $n+1]
824 set m [expr $m+1]
825 }
826 set pre_context {}
827 } elseif {$c1 eq $to_context} {
828 # turn change line into context line
829 set ln [$ui_diff get "$i_l + 1 chars" $next_l]
830 if {$c1 eq {-}} {
831 set pre_context "$pre_context $ln"
832 } else {
833 set patch "$patch $ln"
834 }
835 set n [expr $n+1]
836 set m [expr $m+1]
837 } else {
838 # a change in the opposite direction of
839 # to_context which is outside the range of
840 # lines to apply.
841 set patch "$patch$pre_context"
842 set pre_context {}
843 }
844 set i_l $next_l
845 }
846 set patch "$patch$pre_context"
847 set wholepatch "$wholepatch@@ -$hln,$n +$hln,$m @@\n$patch"
848 set first_l [$ui_diff index "$next_l + 1 lines"]
849 }
850
851 if {[catch {
852 set enc [get_path_encoding $current_diff_path]
853 set p [eval git_write $apply_cmd]
854 fconfigure $p -translation binary -encoding $enc
855 puts -nonewline $p $current_diff_header
856 puts -nonewline $p $wholepatch
857 close $p} err]} {
858 error_popup "$failed_msg\n\n$err"
859 unlock_index
860 return
861 }
862
863 if {$revert} {
864 # Save a copy of this patch for undoing reverts.
865 set last_revert $current_diff_header$wholepatch
866 set last_revert_enc $enc
867 }
868
869 unlock_index
870 }
871
872 # Undo the last line/hunk reverted. When hunks and lines are reverted, a copy
873 # of the diff applied is saved. Re-apply that diff to undo the revert.
874 #
875 # Right now, we only use a single variable to hold the copy, and not a
876 # stack/deque for simplicity, so multiple undos are not possible. Maybe this
877 # can be added if the need for something like this is felt in the future.
878 proc undo_last_revert {} {
879 global last_revert current_diff_path current_diff_header
880 global last_revert_enc
881
882 if {$last_revert eq {}} return
883 if {![lock_index apply_hunk]} return
884
885 set apply_cmd {apply --whitespace=nowarn}
886 set failed_msg [mc "Failed to undo last revert."]
887
888 if {[catch {
889 set enc $last_revert_enc
890 set p [eval git_write $apply_cmd]
891 fconfigure $p -translation binary -encoding $enc
892 puts -nonewline $p $last_revert
893 close $p} err]} {
894 error_popup "$failed_msg\n\n$err"
895 unlock_index
896 return
897 }
898
899 set last_revert {}
900
901 unlock_index
902 }