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git-gui: Make usage statement visible on Windows.
[git/gitweb.git] / lib / diff.tcl
blobc628750276303fca620c9292463c4c59690c764f
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_@
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_@
219 }
220 if {[string first "\0" $content] != -1} {
221 $ui_diff insert end \
222 [mc "* Binary file (not showing content)."] \
223 d_@
224 } else {
225 if {$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_@
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_@
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 start_show_diff {cont_info {add_opts {}}} {
257 global file_states file_lists
258 global is_3way_diff is_submodule_diff diff_active repo_config
259 global ui_diff ui_index ui_workdir
260 global current_diff_path current_diff_side current_diff_header
261
262 set path $current_diff_path
263 set w $current_diff_side
264
265 set s $file_states($path)
266 set m [lindex $s 0]
267 set is_3way_diff 0
268 set is_submodule_diff 0
269 set diff_active 1
270 set current_diff_header {}
271
272 set cmd [list]
273 if {$w eq $ui_index} {
274 lappend cmd diff-index
275 lappend cmd --cached
276 } elseif {$w eq $ui_workdir} {
277 if {[string first {U} $m] >= 0} {
278 lappend cmd diff
279 } else {
280 lappend cmd diff-files
281 }
282 }
283 if {![is_config_false gui.textconv] && [git-version >= 1.6.1]} {
284 lappend cmd --textconv
285 }
286
287 if {[string match {160000 *} [lindex $s 2]]
288 || [string match {160000 *} [lindex $s 3]]} {
289 set is_submodule_diff 1
290
291 if {[git-version >= "1.6.6"]} {
292 lappend cmd --submodule
293 }
294 }
295
296 lappend cmd -p
297 lappend cmd --no-color
298 if {$repo_config(gui.diffcontext) >= 1} {
299 lappend cmd "-U$repo_config(gui.diffcontext)"
300 }
301 if {$w eq $ui_index} {
302 lappend cmd [PARENT]
303 }
304 if {$add_opts ne {}} {
305 eval lappend cmd $add_opts
306 } else {
307 lappend cmd --
308 lappend cmd $path
309 }
310
311 if {$is_submodule_diff && [git-version < "1.6.6"]} {
312 if {$w eq $ui_index} {
313 set cmd [list submodule summary --cached -- $path]
314 } else {
315 set cmd [list submodule summary --files -- $path]
316 }
317 }
318
319 if {[catch {set fd [eval git_read --nice $cmd]} err]} {
320 set diff_active 0
321 unlock_index
322 ui_status [mc "Unable to display %s" [escape_path $path]]
323 error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
324 return
325 }
326
327 set ::current_diff_inheader 1
328 fconfigure $fd \
329 -blocking 0 \
330 -encoding [get_path_encoding $path] \
331 -translation lf
332 fileevent $fd readable [list read_diff $fd $cont_info]
333 }
334
335 proc read_diff {fd cont_info} {
336 global ui_diff diff_active is_submodule_diff
337 global is_3way_diff is_conflict_diff current_diff_header
338 global current_diff_queue
339 global diff_empty_count
340
341 $ui_diff conf -state normal
342 while {[gets $fd line] >= 0} {
343 # -- Cleanup uninteresting diff header lines.
344 #
345 if {$::current_diff_inheader} {
346 if { [string match {diff --git *} $line]
347 || [string match {diff --cc *} $line]
348 || [string match {diff --combined *} $line]
349 || [string match {--- *} $line]
350 || [string match {+++ *} $line]} {
351 append current_diff_header $line "\n"
352 continue
353 }
354 }
355 if {[string match {index *} $line]} continue
356 if {$line eq {deleted file mode 120000}} {
357 set line "deleted symlink"
358 }
359 set ::current_diff_inheader 0
360
361 # -- Automatically detect if this is a 3 way diff.
362 #
363 if {[string match {@@@ *} $line]} {set is_3way_diff 1}
364
365 if {[string match {mode *} $line]
366 || [string match {new file *} $line]
367 || [regexp {^(old|new) mode *} $line]
368 || [string match {deleted file *} $line]
369 || [string match {deleted symlink} $line]
370 || [string match {Binary files * and * differ} $line]
371 || $line eq {\ No newline at end of file}
372 || [regexp {^\* Unmerged path } $line]} {
373 set tags {}
374 } elseif {$is_3way_diff} {
375 set op [string range $line 0 1]
376 switch -- $op {
377 { } {set tags {}}
378 {@@} {set tags d_@}
379 { +} {set tags d_s+}
380 { -} {set tags d_s-}
381 {+ } {set tags d_+s}
382 {- } {set tags d_-s}
383 {--} {set tags d_--}
384 {++} {
385 if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
386 set is_conflict_diff 1
387 set line [string replace $line 0 1 { }]
388 set tags d$op
389 } else {
390 set tags d_++
391 }
392 }
393 default {
394 puts "error: Unhandled 3 way diff marker: {$op}"
395 set tags {}
396 }
397 }
398 } elseif {$is_submodule_diff} {
399 if {$line == ""} continue
400 if {[regexp {^Submodule } $line]} {
401 set tags d_@
402 } elseif {[regexp {^\* } $line]} {
403 set line [string replace $line 0 1 {Submodule }]
404 set tags d_@
405 } else {
406 set op [string range $line 0 2]
407 switch -- $op {
408 { <} {set tags d_-}
409 { >} {set tags d_+}
410 { W} {set tags {}}
411 default {
412 puts "error: Unhandled submodule diff marker: {$op}"
413 set tags {}
414 }
415 }
416 }
417 } else {
418 set op [string index $line 0]
419 switch -- $op {
420 { } {set tags {}}
421 {@} {set tags d_@}
422 {-} {set tags d_-}
423 {+} {
424 if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
425 set is_conflict_diff 1
426 set tags d$op
427 } else {
428 set tags d_+
429 }
430 }
431 default {
432 puts "error: Unhandled 2 way diff marker: {$op}"
433 set tags {}
434 }
435 }
436 }
437 $ui_diff insert end $line $tags
438 if {[string index $line end] eq "\r"} {
439 $ui_diff tag add d_cr {end - 2c}
440 }
441 $ui_diff insert end "\n" $tags
442 }
443 $ui_diff conf -state disabled
444
445 if {[eof $fd]} {
446 close $fd
447
448 if {$current_diff_queue ne {}} {
449 advance_diff_queue $cont_info
450 return
451 }
452
453 set diff_active 0
454 unlock_index
455 set scroll_pos [lindex $cont_info 0]
456 if {$scroll_pos ne {}} {
457 update
458 $ui_diff yview moveto $scroll_pos
459 }
460 ui_ready
461
462 if {[$ui_diff index end] eq {2.0}} {
463 handle_empty_diff
464 } else {
465 set diff_empty_count 0
466 }
467
468 set callback [lindex $cont_info 1]
469 if {$callback ne {}} {
470 eval $callback
471 }
472 }
473 }
474
475 proc apply_hunk {x y} {
476 global current_diff_path current_diff_header current_diff_side
477 global ui_diff ui_index file_states
478
479 if {$current_diff_path eq {} || $current_diff_header eq {}} return
480 if {![lock_index apply_hunk]} return
481
482 set apply_cmd {apply --cached --whitespace=nowarn}
483 set mi [lindex $file_states($current_diff_path) 0]
484 if {$current_diff_side eq $ui_index} {
485 set failed_msg [mc "Failed to unstage selected hunk."]
486 lappend apply_cmd --reverse
487 if {[string index $mi 0] ne {M}} {
488 unlock_index
489 return
490 }
491 } else {
492 set failed_msg [mc "Failed to stage selected hunk."]
493 if {[string index $mi 1] ne {M}} {
494 unlock_index
495 return
496 }
497 }
498
499 set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
500 set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
501 if {$s_lno eq {}} {
502 unlock_index
503 return
504 }
505
506 set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
507 if {$e_lno eq {}} {
508 set e_lno end
509 }
510
511 if {[catch {
512 set enc [get_path_encoding $current_diff_path]
513 set p [eval git_write $apply_cmd]
514 fconfigure $p -translation binary -encoding $enc
515 puts -nonewline $p $current_diff_header
516 puts -nonewline $p [$ui_diff get $s_lno $e_lno]
517 close $p} err]} {
518 error_popup [append $failed_msg "\n\n$err"]
519 unlock_index
520 return
521 }
522
523 $ui_diff conf -state normal
524 $ui_diff delete $s_lno $e_lno
525 $ui_diff conf -state disabled
526
527 if {[$ui_diff get 1.0 end] eq "\n"} {
528 set o _
529 } else {
530 set o ?
531 }
532
533 if {$current_diff_side eq $ui_index} {
534 set mi ${o}M
535 } elseif {[string index $mi 0] eq {_}} {
536 set mi M$o
537 } else {
538 set mi ?$o
539 }
540 unlock_index
541 display_file $current_diff_path $mi
542 # This should trigger shift to the next changed file
543 if {$o eq {_}} {
544 reshow_diff
545 }
546 }
547
548 proc apply_range_or_line {x y} {
549 global current_diff_path current_diff_header current_diff_side
550 global ui_diff ui_index file_states
551
552 set selected [$ui_diff tag nextrange sel 0.0]
553
554 if {$selected == {}} {
555 set first [$ui_diff index "@$x,$y"]
556 set last $first
557 } else {
558 set first [lindex $selected 0]
559 set last [lindex $selected 1]
560 }
561
562 set first_l [$ui_diff index "$first linestart"]
563 set last_l [$ui_diff index "$last lineend"]
564
565 if {$current_diff_path eq {} || $current_diff_header eq {}} return
566 if {![lock_index apply_hunk]} return
567
568 set apply_cmd {apply --cached --whitespace=nowarn}
569 set mi [lindex $file_states($current_diff_path) 0]
570 if {$current_diff_side eq $ui_index} {
571 set failed_msg [mc "Failed to unstage selected line."]
572 set to_context {+}
573 lappend apply_cmd --reverse
574 if {[string index $mi 0] ne {M}} {
575 unlock_index
576 return
577 }
578 } else {
579 set failed_msg [mc "Failed to stage selected line."]
580 set to_context {-}
581 if {[string index $mi 1] ne {M}} {
582 unlock_index
583 return
584 }
585 }
586
587 set wholepatch {}
588
589 while {$first_l < $last_l} {
590 set i_l [$ui_diff search -backwards -regexp ^@@ $first_l 0.0]
591 if {$i_l eq {}} {
592 # If there's not a @@ above, then the selected range
593 # must have come before the first_l @@
594 set i_l [$ui_diff search -regexp ^@@ $first_l $last_l]
595 }
596 if {$i_l eq {}} {
597 unlock_index
598 return
599 }
600 # $i_l is now at the beginning of a line
601
602 # pick start line number from hunk header
603 set hh [$ui_diff get $i_l "$i_l + 1 lines"]
604 set hh [lindex [split $hh ,] 0]
605 set hln [lindex [split $hh -] 1]
606
607 # There is a special situation to take care of. Consider this
608 # hunk:
609 #
610 # @@ -10,4 +10,4 @@
611 # context before
612 # -old 1
613 # -old 2
614 # +new 1
615 # +new 2
616 # context after
617 #
618 # We used to keep the context lines in the order they appear in
619 # the hunk. But then it is not possible to correctly stage only
620 # "-old 1" and "+new 1" - it would result in this staged text:
621 #
622 # context before
623 # old 2
624 # new 1
625 # context after
626 #
627 # (By symmetry it is not possible to *un*stage "old 2" and "new
628 # 2".)
629 #
630 # We resolve the problem by introducing an asymmetry, namely,
631 # when a "+" line is *staged*, it is moved in front of the
632 # context lines that are generated from the "-" lines that are
633 # immediately before the "+" block. That is, we construct this
634 # patch:
635 #
636 # @@ -10,4 +10,5 @@
637 # context before
638 # +new 1
639 # old 1
640 # old 2
641 # context after
642 #
643 # But we do *not* treat "-" lines that are *un*staged in a
644 # special way.
645 #
646 # With this asymmetry it is possible to stage the change "old
647 # 1" -> "new 1" directly, and to stage the change "old 2" ->
648 # "new 2" by first staging the entire hunk and then unstaging
649 # the change "old 1" -> "new 1".
650 #
651 # Applying multiple lines adds complexity to the special
652 # situation. The pre_context must be moved after the entire
653 # first block of consecutive staged "+" lines, so that
654 # staging both additions gives the following patch:
655 #
656 # @@ -10,4 +10,6 @@
657 # context before
658 # +new 1
659 # +new 2
660 # old 1
661 # old 2
662 # context after
663
664 # This is non-empty if and only if we are _staging_ changes;
665 # then it accumulates the consecutive "-" lines (after
666 # converting them to context lines) in order to be moved after
667 # "+" change lines.
668 set pre_context {}
669
670 set n 0
671 set m 0
672 set i_l [$ui_diff index "$i_l + 1 lines"]
673 set patch {}
674 while {[$ui_diff compare $i_l < "end - 1 chars"] &&
675 [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
676 set next_l [$ui_diff index "$i_l + 1 lines"]
677 set c1 [$ui_diff get $i_l]
678 if {[$ui_diff compare $first_l <= $i_l] &&
679 [$ui_diff compare $i_l < $last_l] &&
680 ($c1 eq {-} || $c1 eq {+})} {
681 # a line to stage/unstage
682 set ln [$ui_diff get $i_l $next_l]
683 if {$c1 eq {-}} {
684 set n [expr $n+1]
685 set patch "$patch$pre_context$ln"
686 set pre_context {}
687 } else {
688 set m [expr $m+1]
689 set patch "$patch$ln"
690 }
691 } elseif {$c1 ne {-} && $c1 ne {+}} {
692 # context line
693 set ln [$ui_diff get $i_l $next_l]
694 set patch "$patch$pre_context$ln"
695 set n [expr $n+1]
696 set m [expr $m+1]
697 set pre_context {}
698 } elseif {$c1 eq $to_context} {
699 # turn change line into context line
700 set ln [$ui_diff get "$i_l + 1 chars" $next_l]
701 if {$c1 eq {-}} {
702 set pre_context "$pre_context $ln"
703 } else {
704 set patch "$patch $ln"
705 }
706 set n [expr $n+1]
707 set m [expr $m+1]
708 } else {
709 # a change in the opposite direction of
710 # to_context which is outside the range of
711 # lines to apply.
712 set patch "$patch$pre_context"
713 set pre_context {}
714 }
715 set i_l $next_l
716 }
717 set patch "$patch$pre_context"
718 set wholepatch "$wholepatch@@ -$hln,$n +$hln,$m @@\n$patch"
719 set first_l [$ui_diff index "$next_l + 1 lines"]
720 }
721
722 if {[catch {
723 set enc [get_path_encoding $current_diff_path]
724 set p [eval git_write $apply_cmd]
725 fconfigure $p -translation binary -encoding $enc
726 puts -nonewline $p $current_diff_header
727 puts -nonewline $p $wholepatch
728 close $p} err]} {
729 error_popup [append $failed_msg "\n\n$err"]
730 }
731
732 unlock_index
733 }
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