git-gui: Don't show blame tooltips that we have no data for
[git] / lib / diff.tcl
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 {} {
20         global file_states file_lists
21         global current_diff_path current_diff_side
22
23         set p $current_diff_path
24         if {$p eq {}} {
25                 # No diff is being shown.
26         } elseif {$current_diff_side eq {}
27                 || [catch {set s $file_states($p)}]
28                 || [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} {
29                 clear_diff
30         } else {
31                 show_diff $p $current_diff_side
32         }
33 }
34
35 proc handle_empty_diff {} {
36         global current_diff_path file_states file_lists
37
38         set path $current_diff_path
39         set s $file_states($path)
40         if {[lindex $s 0] ne {_M}} return
41
42         info_popup "No differences detected.
43
44 [short_path $path] has no changes.
45
46 The modification date of this file was updated by another application, but the content within the file was not changed.
47
48 A rescan will be automatically started to find other files which may have the same state."
49
50         clear_diff
51         display_file $path __
52         rescan ui_ready 0
53 }
54
55 proc show_diff {path w {lno {}}} {
56         global file_states file_lists
57         global is_3way_diff diff_active repo_config
58         global ui_diff ui_index ui_workdir
59         global current_diff_path current_diff_side current_diff_header
60
61         if {$diff_active || ![lock_index read]} return
62
63         clear_diff
64         if {$lno == {}} {
65                 set lno [lsearch -sorted -exact $file_lists($w) $path]
66                 if {$lno >= 0} {
67                         incr lno
68                 }
69         }
70         if {$lno >= 1} {
71                 $w tag add in_diff $lno.0 [expr {$lno + 1}].0
72         }
73
74         set s $file_states($path)
75         set m [lindex $s 0]
76         set is_3way_diff 0
77         set diff_active 1
78         set current_diff_path $path
79         set current_diff_side $w
80         set current_diff_header {}
81         ui_status "Loading diff of [escape_path $path]..."
82
83         # - Git won't give us the diff, there's nothing to compare to!
84         #
85         if {$m eq {_O}} {
86                 set max_sz [expr {128 * 1024}]
87                 if {[catch {
88                                 set fd [open $path r]
89                                 fconfigure $fd -eofchar {}
90                                 set content [read $fd $max_sz]
91                                 close $fd
92                                 set sz [file size $path]
93                         } err ]} {
94                         set diff_active 0
95                         unlock_index
96                         ui_status "Unable to display [escape_path $path]"
97                         error_popup "Error loading file:\n\n$err"
98                         return
99                 }
100                 $ui_diff conf -state normal
101                 if {![catch {set type [exec file $path]}]} {
102                         set n [string length $path]
103                         if {[string equal -length $n $path $type]} {
104                                 set type [string range $type $n end]
105                                 regsub {^:?\s*} $type {} type
106                         }
107                         $ui_diff insert end "* $type\n" d_@
108                 }
109                 if {[string first "\0" $content] != -1} {
110                         $ui_diff insert end \
111                                 "* Binary file (not showing content)." \
112                                 d_@
113                 } else {
114                         if {$sz > $max_sz} {
115                                 $ui_diff insert end \
116 "* Untracked file is $sz bytes.
117 * Showing only first $max_sz bytes.
118 " d_@
119                         }
120                         $ui_diff insert end $content
121                         if {$sz > $max_sz} {
122                                 $ui_diff insert end "
123 * Untracked file clipped here by [appname].
124 * To see the entire file, use an external editor.
125 " d_@
126                         }
127                 }
128                 $ui_diff conf -state disabled
129                 set diff_active 0
130                 unlock_index
131                 ui_ready
132                 return
133         }
134
135         set cmd [list]
136         if {$w eq $ui_index} {
137                 lappend cmd diff-index
138                 lappend cmd --cached
139         } elseif {$w eq $ui_workdir} {
140                 if {[string index $m 0] eq {U}} {
141                         lappend cmd diff
142                 } else {
143                         lappend cmd diff-files
144                 }
145         }
146
147         lappend cmd -p
148         lappend cmd --no-color
149         if {$repo_config(gui.diffcontext) >= 0} {
150                 lappend cmd "-U$repo_config(gui.diffcontext)"
151         }
152         if {$w eq $ui_index} {
153                 lappend cmd [PARENT]
154         }
155         lappend cmd --
156         lappend cmd $path
157
158         if {[catch {set fd [eval git_read --nice $cmd]} err]} {
159                 set diff_active 0
160                 unlock_index
161                 ui_status "Unable to display [escape_path $path]"
162                 error_popup "Error loading diff:\n\n$err"
163                 return
164         }
165
166         fconfigure $fd \
167                 -blocking 0 \
168                 -encoding binary \
169                 -translation binary
170         fileevent $fd readable [list read_diff $fd]
171 }
172
173 proc read_diff {fd} {
174         global ui_diff diff_active
175         global is_3way_diff current_diff_header
176
177         $ui_diff conf -state normal
178         while {[gets $fd line] >= 0} {
179                 # -- Cleanup uninteresting diff header lines.
180                 #
181                 if {   [string match {diff --git *}      $line]
182                         || [string match {diff --cc *}       $line]
183                         || [string match {diff --combined *} $line]
184                         || [string match {--- *}             $line]
185                         || [string match {+++ *}             $line]} {
186                         append current_diff_header $line "\n"
187                         continue
188                 }
189                 if {[string match {index *} $line]} continue
190                 if {$line eq {deleted file mode 120000}} {
191                         set line "deleted symlink"
192                 }
193
194                 # -- Automatically detect if this is a 3 way diff.
195                 #
196                 if {[string match {@@@ *} $line]} {set is_3way_diff 1}
197
198                 if {[string match {mode *} $line]
199                         || [string match {new file *} $line]
200                         || [string match {deleted file *} $line]
201                         || [string match {Binary files * and * differ} $line]
202                         || $line eq {\ No newline at end of file}
203                         || [regexp {^\* Unmerged path } $line]} {
204                         set tags {}
205                 } elseif {$is_3way_diff} {
206                         set op [string range $line 0 1]
207                         switch -- $op {
208                         {  } {set tags {}}
209                         {@@} {set tags d_@}
210                         { +} {set tags d_s+}
211                         { -} {set tags d_s-}
212                         {+ } {set tags d_+s}
213                         {- } {set tags d_-s}
214                         {--} {set tags d_--}
215                         {++} {
216                                 if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
217                                         set line [string replace $line 0 1 {  }]
218                                         set tags d$op
219                                 } else {
220                                         set tags d_++
221                                 }
222                         }
223                         default {
224                                 puts "error: Unhandled 3 way diff marker: {$op}"
225                                 set tags {}
226                         }
227                         }
228                 } else {
229                         set op [string index $line 0]
230                         switch -- $op {
231                         { } {set tags {}}
232                         {@} {set tags d_@}
233                         {-} {set tags d_-}
234                         {+} {
235                                 if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
236                                         set line [string replace $line 0 0 { }]
237                                         set tags d$op
238                                 } else {
239                                         set tags d_+
240                                 }
241                         }
242                         default {
243                                 puts "error: Unhandled 2 way diff marker: {$op}"
244                                 set tags {}
245                         }
246                         }
247                 }
248                 $ui_diff insert end $line $tags
249                 if {[string index $line end] eq "\r"} {
250                         $ui_diff tag add d_cr {end - 2c}
251                 }
252                 $ui_diff insert end "\n" $tags
253         }
254         $ui_diff conf -state disabled
255
256         if {[eof $fd]} {
257                 close $fd
258                 set diff_active 0
259                 unlock_index
260                 ui_ready
261
262                 if {[$ui_diff index end] eq {2.0}} {
263                         handle_empty_diff
264                 }
265         }
266 }
267
268 proc apply_hunk {x y} {
269         global current_diff_path current_diff_header current_diff_side
270         global ui_diff ui_index file_states
271
272         if {$current_diff_path eq {} || $current_diff_header eq {}} return
273         if {![lock_index apply_hunk]} return
274
275         set apply_cmd {apply --cached --whitespace=nowarn}
276         set mi [lindex $file_states($current_diff_path) 0]
277         if {$current_diff_side eq $ui_index} {
278                 set mode unstage
279                 lappend apply_cmd --reverse
280                 if {[string index $mi 0] ne {M}} {
281                         unlock_index
282                         return
283                 }
284         } else {
285                 set mode stage
286                 if {[string index $mi 1] ne {M}} {
287                         unlock_index
288                         return
289                 }
290         }
291
292         set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
293         set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
294         if {$s_lno eq {}} {
295                 unlock_index
296                 return
297         }
298
299         set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
300         if {$e_lno eq {}} {
301                 set e_lno end
302         }
303
304         if {[catch {
305                 set p [eval git_write $apply_cmd]
306                 fconfigure $p -translation binary -encoding binary
307                 puts -nonewline $p $current_diff_header
308                 puts -nonewline $p [$ui_diff get $s_lno $e_lno]
309                 close $p} err]} {
310                 error_popup "Failed to $mode selected hunk.\n\n$err"
311                 unlock_index
312                 return
313         }
314
315         $ui_diff conf -state normal
316         $ui_diff delete $s_lno $e_lno
317         $ui_diff conf -state disabled
318
319         if {[$ui_diff get 1.0 end] eq "\n"} {
320                 set o _
321         } else {
322                 set o ?
323         }
324
325         if {$current_diff_side eq $ui_index} {
326                 set mi ${o}M
327         } elseif {[string index $mi 0] eq {_}} {
328                 set mi M$o
329         } else {
330                 set mi ?$o
331         }
332         unlock_index
333         display_file $current_diff_path $mi
334         if {$o eq {_}} {
335                 clear_diff
336         }
337 }