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remote: handle negative refspecs in git remote show
[alt-git.git] / git-gui / lib / diff.tcl
blob871ad488c2a1c010c8a9edd66ae6a6bfd9d4213e
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 start_show_diff {cont_info {add_opts {}}} {
274 global file_states file_lists
275 global is_3way_diff is_submodule_diff diff_active repo_config
276 global ui_diff ui_index ui_workdir
277 global current_diff_path current_diff_side current_diff_header
278
279 set path $current_diff_path
280 set w $current_diff_side
281
282 set s $file_states($path)
283 set m [lindex $s 0]
284 set is_3way_diff 0
285 set is_submodule_diff 0
286 set diff_active 1
287 set current_diff_header {}
288 set conflict_size [gitattr $path conflict-marker-size 7]
289
290 set cmd [list]
291 if {$w eq $ui_index} {
292 lappend cmd diff-index
293 lappend cmd --cached
294 if {[git-version >= "1.7.2"]} {
295 lappend cmd --ignore-submodules=dirty
296 }
297 } elseif {$w eq $ui_workdir} {
298 if {[string first {U} $m] >= 0} {
299 lappend cmd diff
300 } else {
301 lappend cmd diff-files
302 }
303 }
304 if {![is_config_false gui.textconv] && [git-version >= 1.6.1]} {
305 lappend cmd --textconv
306 }
307
308 if {[string match {160000 *} [lindex $s 2]]
309 || [string match {160000 *} [lindex $s 3]]} {
310 set is_submodule_diff 1
311
312 if {[git-version >= "1.6.6"]} {
313 lappend cmd --submodule
314 }
315 }
316
317 lappend cmd -p
318 lappend cmd --color
319 set cmd [concat $cmd $repo_config(gui.diffopts)]
320 if {$repo_config(gui.diffcontext) >= 1} {
321 lappend cmd "-U$repo_config(gui.diffcontext)"
322 }
323 if {$w eq $ui_index} {
324 lappend cmd [PARENT]
325 }
326 if {$add_opts ne {}} {
327 eval lappend cmd $add_opts
328 } else {
329 lappend cmd --
330 lappend cmd $path
331 }
332
333 if {$is_submodule_diff && [git-version < "1.6.6"]} {
334 if {$w eq $ui_index} {
335 set cmd [list submodule summary --cached -- $path]
336 } else {
337 set cmd [list submodule summary --files -- $path]
338 }
339 }
340
341 if {[catch {set fd [eval git_read --nice $cmd]} err]} {
342 set diff_active 0
343 unlock_index
344 ui_status [mc "Unable to display %s" [escape_path $path]]
345 error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
346 return
347 }
348
349 set ::current_diff_inheader 1
350 # Detect pre-image lines of the diff3 conflict-style. They are just
351 # '++' lines which is not bijective. Thus, we need to maintain a state
352 # across lines.
353 set ::conflict_in_pre_image 0
354 fconfigure $fd \
355 -blocking 0 \
356 -encoding [get_path_encoding $path] \
357 -translation lf
358 fileevent $fd readable [list read_diff $fd $conflict_size $cont_info]
359 }
360
361 proc parse_color_line {line} {
362 set start 0
363 set result ""
364 set markup [list]
365 set regexp {\033\[((?:\d+;)*\d+)?m}
366 set need_reset 0
367 while {[regexp -indices -start $start $regexp $line match code]} {
368 foreach {begin end} $match break
369 append result [string range $line $start [expr {$begin - 1}]]
370 set pos [string length $result]
371 set col [eval [linsert $code 0 string range $line]]
372 set start [incr end]
373 if {$col eq "0" || $col eq ""} {
374 if {!$need_reset} continue
375 set need_reset 0
376 } else {
377 set need_reset 1
378 }
379 lappend markup $pos $col
380 }
381 append result [string range $line $start end]
382 if {[llength $markup] < 4} {set markup {}}
383 return [list $result $markup]
384 }
385
386 proc read_diff {fd conflict_size cont_info} {
387 global ui_diff diff_active is_submodule_diff
388 global is_3way_diff is_conflict_diff current_diff_header
389 global current_diff_queue
390 global diff_empty_count
391
392 $ui_diff conf -state normal
393 while {[gets $fd line] >= 0} {
394 foreach {line markup} [parse_color_line $line] break
395 set line [string map {\033 ^} $line]
396
397 set tags {}
398
399 # -- Check for start of diff header.
400 if { [string match {diff --git *} $line]
401 || [string match {diff --cc *} $line]
402 || [string match {diff --combined *} $line]} {
403 set ::current_diff_inheader 1
404 }
405
406 # -- Check for end of diff header (any hunk line will do this).
407 #
408 if {[regexp {^@@+ } $line]} {set ::current_diff_inheader 0}
409
410 # -- Automatically detect if this is a 3 way diff.
411 #
412 if {[string match {@@@ *} $line]} {
413 set is_3way_diff 1
414 apply_tab_size 1
415 }
416
417 if {$::current_diff_inheader} {
418
419 # -- These two lines stop a diff header and shouldn't be in there
420 if { [string match {Binary files * and * differ} $line]
421 || [regexp {^\* Unmerged path } $line]} {
422 set ::current_diff_inheader 0
423 } else {
424 append current_diff_header $line "\n"
425 }
426
427 # -- Cleanup uninteresting diff header lines.
428 #
429 if { [string match {diff --git *} $line]
430 || [string match {diff --cc *} $line]
431 || [string match {diff --combined *} $line]
432 || [string match {--- *} $line]
433 || [string match {+++ *} $line]
434 || [string match {index *} $line]} {
435 continue
436 }
437
438 # -- Name it symlink, not 120000
439 # Note, that the original line is in $current_diff_header
440 regsub {^(deleted|new) file mode 120000} $line {\1 symlink} line
441
442 } elseif { $line eq {\ No newline at end of file}} {
443 # -- Handle some special lines
444 } elseif {$is_3way_diff} {
445 set op [string range $line 0 1]
446 switch -- $op {
447 { } {set tags {}}
448 {@@} {set tags d_@}
449 { +} {set tags d_s+}
450 { -} {set tags d_s-}
451 {+ } {set tags d_+s}
452 {- } {set tags d_-s}
453 {--} {set tags d_--}
454 {++} {
455 set regexp [string map [list %conflict_size $conflict_size]\
456 {^\+\+([<>=|]){%conflict_size}(?: |$)}]
457 if {[regexp $regexp $line _g op]} {
458 set is_conflict_diff 1
459 set line [string replace $line 0 1 { }]
460 set tags d$op
461
462 # The ||| conflict-marker marks the start of the pre-image.
463 # All those lines are also prefixed with '++'. Thus we need
464 # to maintain this state.
465 set ::conflict_in_pre_image [expr {$op eq {|}}]
466 } elseif {$::conflict_in_pre_image} {
467 # This is a pre-image line. It is the one which both sides
468 # are based on. As it has also the '++' line start, it is
469 # normally shown as 'added'. Invert this to '--' to make
470 # it a 'removed' line.
471 set line [string replace $line 0 1 {--}]
472 set tags d_--
473 } else {
474 set tags d_++
475 }
476 }
477 default {
478 puts "error: Unhandled 3 way diff marker: {$op}"
479 set tags {}
480 }
481 }
482 } elseif {$is_submodule_diff} {
483 if {$line == ""} continue
484 if {[regexp {^Submodule } $line]} {
485 set tags d_info
486 } elseif {[regexp {^\* } $line]} {
487 set line [string replace $line 0 1 {Submodule }]
488 set tags d_info
489 } else {
490 set op [string range $line 0 2]
491 switch -- $op {
492 { <} {set tags d_-}
493 { >} {set tags d_+}
494 { W} {set tags {}}
495 default {
496 puts "error: Unhandled submodule diff marker: {$op}"
497 set tags {}
498 }
499 }
500 }
501 } else {
502 set op [string index $line 0]
503 switch -- $op {
504 { } {set tags {}}
505 {@} {set tags d_@}
506 {-} {set tags d_-}
507 {+} {
508 set regexp [string map [list %conflict_size $conflict_size]\
509 {^\+([<>=]){%conflict_size}(?: |$)}]
510 if {[regexp $regexp $line _g op]} {
511 set is_conflict_diff 1
512 set tags d$op
513 } else {
514 set tags d_+
515 }
516 }
517 default {
518 puts "error: Unhandled 2 way diff marker: {$op}"
519 set tags {}
520 }
521 }
522 }
523 set mark [$ui_diff index "end - 1 line linestart"]
524 $ui_diff insert end $line $tags
525 if {[string index $line end] eq "\r"} {
526 $ui_diff tag add d_cr {end - 2c}
527 }
528 $ui_diff insert end "\n" $tags
529
530 foreach {posbegin colbegin posend colend} $markup {
531 set prefix clr
532 foreach style [lsort -integer [split $colbegin ";"]] {
533 if {$style eq "7"} {append prefix i; continue}
534 if {$style != 4 && ($style < 30 || $style > 47)} {continue}
535 set a "$mark linestart + $posbegin chars"
536 set b "$mark linestart + $posend chars"
537 catch {$ui_diff tag add $prefix$style $a $b}
538 }
539 }
540 }
541 $ui_diff conf -state disabled
542
543 if {[eof $fd]} {
544 close $fd
545
546 if {$current_diff_queue ne {}} {
547 advance_diff_queue $cont_info
548 return
549 }
550
551 set diff_active 0
552 unlock_index
553 set scroll_pos [lindex $cont_info 0]
554 if {$scroll_pos ne {}} {
555 update
556 $ui_diff yview moveto $scroll_pos
557 }
558 ui_ready
559
560 if {[$ui_diff index end] eq {2.0}} {
561 handle_empty_diff
562 } else {
563 set diff_empty_count 0
564 }
565
566 set callback [lindex $cont_info 1]
567 if {$callback ne {}} {
568 eval $callback
569 }
570 }
571 }
572
573 proc apply_or_revert_hunk {x y revert} {
574 global current_diff_path current_diff_header current_diff_side
575 global ui_diff ui_index file_states last_revert last_revert_enc
576
577 if {$current_diff_path eq {} || $current_diff_header eq {}} return
578 if {![lock_index apply_hunk]} return
579
580 set apply_cmd {apply --whitespace=nowarn}
581 set mi [lindex $file_states($current_diff_path) 0]
582 if {$current_diff_side eq $ui_index} {
583 set failed_msg [mc "Failed to unstage selected hunk."]
584 lappend apply_cmd --reverse --cached
585 if {[string index $mi 0] ne {M}} {
586 unlock_index
587 return
588 }
589 } else {
590 if {$revert} {
591 set failed_msg [mc "Failed to revert selected hunk."]
592 lappend apply_cmd --reverse
593 } else {
594 set failed_msg [mc "Failed to stage selected hunk."]
595 lappend apply_cmd --cached
596 }
597
598 if {[string index $mi 1] ne {M}} {
599 unlock_index
600 return
601 }
602 }
603
604 set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
605 set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
606 if {$s_lno eq {}} {
607 unlock_index
608 return
609 }
610
611 set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
612 if {$e_lno eq {}} {
613 set e_lno end
614 }
615
616 set wholepatch "$current_diff_header[$ui_diff get $s_lno $e_lno]"
617
618 if {[catch {
619 set enc [get_path_encoding $current_diff_path]
620 set p [eval git_write $apply_cmd]
621 fconfigure $p -translation binary -encoding $enc
622 puts -nonewline $p $wholepatch
623 close $p} err]} {
624 error_popup "$failed_msg\n\n$err"
625 unlock_index
626 return
627 }
628
629 if {$revert} {
630 # Save a copy of this patch for undoing reverts.
631 set last_revert $wholepatch
632 set last_revert_enc $enc
633 }
634
635 $ui_diff conf -state normal
636 $ui_diff delete $s_lno $e_lno
637 $ui_diff conf -state disabled
638
639 # Check if the hunk was the last one in the file.
640 if {[$ui_diff get 1.0 end] eq "\n"} {
641 set o _
642 } else {
643 set o ?
644 }
645
646 # Update the status flags.
647 if {$revert} {
648 set mi [string index $mi 0]$o
649 } elseif {$current_diff_side eq $ui_index} {
650 set mi ${o}M
651 } elseif {[string index $mi 0] eq {_}} {
652 set mi M$o
653 } else {
654 set mi ?$o
655 }
656 unlock_index
657 display_file $current_diff_path $mi
658 # This should trigger shift to the next changed file
659 if {$o eq {_}} {
660 reshow_diff
661 }
662 }
663
664 proc apply_or_revert_range_or_line {x y revert} {
665 global current_diff_path current_diff_header current_diff_side
666 global ui_diff ui_index file_states last_revert
667
668 set selected [$ui_diff tag nextrange sel 0.0]
669
670 if {$selected == {}} {
671 set first [$ui_diff index "@$x,$y"]
672 set last $first
673 } else {
674 set first [lindex $selected 0]
675 set last [lindex $selected 1]
676 }
677
678 set first_l [$ui_diff index "$first linestart"]
679 set last_l [$ui_diff index "$last lineend"]
680
681 if {$current_diff_path eq {} || $current_diff_header eq {}} return
682 if {![lock_index apply_hunk]} return
683
684 set apply_cmd {apply --whitespace=nowarn}
685 set mi [lindex $file_states($current_diff_path) 0]
686 if {$current_diff_side eq $ui_index} {
687 set failed_msg [mc "Failed to unstage selected line."]
688 set to_context {+}
689 lappend apply_cmd --reverse --cached
690 if {[string index $mi 0] ne {M}} {
691 unlock_index
692 return
693 }
694 } else {
695 if {$revert} {
696 set failed_msg [mc "Failed to revert selected line."]
697 set to_context {+}
698 lappend apply_cmd --reverse
699 } else {
700 set failed_msg [mc "Failed to stage selected line."]
701 set to_context {-}
702 lappend apply_cmd --cached
703 }
704
705 if {[string index $mi 1] ne {M}} {
706 unlock_index
707 return
708 }
709 }
710
711 set wholepatch {}
712
713 while {$first_l < $last_l} {
714 set i_l [$ui_diff search -backwards -regexp ^@@ $first_l 0.0]
715 if {$i_l eq {}} {
716 # If there's not a @@ above, then the selected range
717 # must have come before the first_l @@
718 set i_l [$ui_diff search -regexp ^@@ $first_l $last_l]
719 }
720 if {$i_l eq {}} {
721 unlock_index
722 return
723 }
724 # $i_l is now at the beginning of a line
725
726 # pick start line number from hunk header
727 set hh [$ui_diff get $i_l "$i_l + 1 lines"]
728 set hh [lindex [split $hh ,] 0]
729 set hln [lindex [split $hh -] 1]
730 set hln [lindex [split $hln " "] 0]
731
732 # There is a special situation to take care of. Consider this
733 # hunk:
734 #
735 # @@ -10,4 +10,4 @@
736 # context before
737 # -old 1
738 # -old 2
739 # +new 1
740 # +new 2
741 # context after
742 #
743 # We used to keep the context lines in the order they appear in
744 # the hunk. But then it is not possible to correctly stage only
745 # "-old 1" and "+new 1" - it would result in this staged text:
746 #
747 # context before
748 # old 2
749 # new 1
750 # context after
751 #
752 # (By symmetry it is not possible to *un*stage "old 2" and "new
753 # 2".)
754 #
755 # We resolve the problem by introducing an asymmetry, namely,
756 # when a "+" line is *staged*, it is moved in front of the
757 # context lines that are generated from the "-" lines that are
758 # immediately before the "+" block. That is, we construct this
759 # patch:
760 #
761 # @@ -10,4 +10,5 @@
762 # context before
763 # +new 1
764 # old 1
765 # old 2
766 # context after
767 #
768 # But we do *not* treat "-" lines that are *un*staged in a
769 # special way.
770 #
771 # With this asymmetry it is possible to stage the change "old
772 # 1" -> "new 1" directly, and to stage the change "old 2" ->
773 # "new 2" by first staging the entire hunk and then unstaging
774 # the change "old 1" -> "new 1".
775 #
776 # Applying multiple lines adds complexity to the special
777 # situation. The pre_context must be moved after the entire
778 # first block of consecutive staged "+" lines, so that
779 # staging both additions gives the following patch:
780 #
781 # @@ -10,4 +10,6 @@
782 # context before
783 # +new 1
784 # +new 2
785 # old 1
786 # old 2
787 # context after
788
789 # This is non-empty if and only if we are _staging_ changes;
790 # then it accumulates the consecutive "-" lines (after
791 # converting them to context lines) in order to be moved after
792 # "+" change lines.
793 set pre_context {}
794
795 set n 0
796 set m 0
797 set i_l [$ui_diff index "$i_l + 1 lines"]
798 set patch {}
799 while {[$ui_diff compare $i_l < "end - 1 chars"] &&
800 [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
801 set next_l [$ui_diff index "$i_l + 1 lines"]
802 set c1 [$ui_diff get $i_l]
803 if {[$ui_diff compare $first_l <= $i_l] &&
804 [$ui_diff compare $i_l < $last_l] &&
805 ($c1 eq {-} || $c1 eq {+})} {
806 # a line to stage/unstage
807 set ln [$ui_diff get $i_l $next_l]
808 if {$c1 eq {-}} {
809 set n [expr $n+1]
810 set patch "$patch$pre_context$ln"
811 set pre_context {}
812 } else {
813 set m [expr $m+1]
814 set patch "$patch$ln"
815 }
816 } elseif {$c1 ne {-} && $c1 ne {+}} {
817 # context line
818 set ln [$ui_diff get $i_l $next_l]
819 set patch "$patch$pre_context$ln"
820 # Skip the "\ No newline at end of
821 # file". Depending on the locale setting
822 # we don't know what this line looks
823 # like exactly. The only thing we do
824 # know is that it starts with "\ "
825 if {![string match {\\ *} $ln]} {
826 set n [expr $n+1]
827 set m [expr $m+1]
828 }
829 set pre_context {}
830 } elseif {$c1 eq $to_context} {
831 # turn change line into context line
832 set ln [$ui_diff get "$i_l + 1 chars" $next_l]
833 if {$c1 eq {-}} {
834 set pre_context "$pre_context $ln"
835 } else {
836 set patch "$patch $ln"
837 }
838 set n [expr $n+1]
839 set m [expr $m+1]
840 } else {
841 # a change in the opposite direction of
842 # to_context which is outside the range of
843 # lines to apply.
844 set patch "$patch$pre_context"
845 set pre_context {}
846 }
847 set i_l $next_l
848 }
849 set patch "$patch$pre_context"
850 set wholepatch "$wholepatch@@ -$hln,$n +$hln,$m @@\n$patch"
851 set first_l [$ui_diff index "$next_l + 1 lines"]
852 }
853
854 if {[catch {
855 set enc [get_path_encoding $current_diff_path]
856 set p [eval git_write $apply_cmd]
857 fconfigure $p -translation binary -encoding $enc
858 puts -nonewline $p $current_diff_header
859 puts -nonewline $p $wholepatch
860 close $p} err]} {
861 error_popup "$failed_msg\n\n$err"
862 unlock_index
863 return
864 }
865
866 if {$revert} {
867 # Save a copy of this patch for undoing reverts.
868 set last_revert $current_diff_header$wholepatch
869 set last_revert_enc $enc
870 }
871
872 unlock_index
873 }
874
875 # Undo the last line/hunk reverted. When hunks and lines are reverted, a copy
876 # of the diff applied is saved. Re-apply that diff to undo the revert.
877 #
878 # Right now, we only use a single variable to hold the copy, and not a
879 # stack/deque for simplicity, so multiple undos are not possible. Maybe this
880 # can be added if the need for something like this is felt in the future.
881 proc undo_last_revert {} {
882 global last_revert current_diff_path current_diff_header
883 global last_revert_enc
884
885 if {$last_revert eq {}} return
886 if {![lock_index apply_hunk]} return
887
888 set apply_cmd {apply --whitespace=nowarn}
889 set failed_msg [mc "Failed to undo last revert."]
890
891 if {[catch {
892 set enc $last_revert_enc
893 set p [eval git_write $apply_cmd]
894 fconfigure $p -translation binary -encoding $enc
895 puts -nonewline $p $last_revert
896 close $p} err]} {
897 error_popup "$failed_msg\n\n$err"
898 unlock_index
899 return
900 }
901
902 set last_revert {}
903
904 unlock_index
905 }
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