git-gui/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                 set type unknown
  88                 if {[catch {
  89                                 set type [file type $path]
  90                                 switch -- $type {
  91                                 directory {
  92                                         set type submodule
  93                                         set content {}
  94                                         set sz 0
  95                                 }
  96                                 link {
  97                                         set content [file readlink $path]
  98                                         set sz [string length $content]
  99                                 }
 100                                 file {
 101                                         set fd [open $path r]
 102                                         fconfigure $fd -eofchar {}
 103                                         set content [read $fd $max_sz]
 104                                         close $fd
 105                                         set sz [file size $path]
 106                                 }
 107                                 default {
 108                                         error "'$type' not supported"
 109                                 }
 110                                 }
 111                         } err ]} {
 112                         set diff_active 0
 113                         unlock_index
 114                         ui_status "Unable to display [escape_path $path]"
 115                         error_popup "Error loading file:\n\n$err"
 116                         return
 117                 }
 118                 $ui_diff conf -state normal
 119                 if {$type eq {submodule}} {
 120                         $ui_diff insert end "* Git Repository (subproject)\n" d_@
 121                 } elseif {![catch {set type [exec file $path]}]} {
 122                         set n [string length $path]
 123                         if {[string equal -length $n $path $type]} {
 124                                 set type [string range $type $n end]
 125                                 regsub {^:?\s*} $type {} type
 126                         }
 127                         $ui_diff insert end "* $type\n" d_@
 128                 }
 129                 if {[string first "\0" $content] != -1} {
 130                         $ui_diff insert end \
 131                                 "* Binary file (not showing content)." \
 132                                 d_@
 133                 } else {
 134                         if {$sz > $max_sz} {
 135                                 $ui_diff insert end \
 136 "* Untracked file is $sz bytes.
 137 * Showing only first $max_sz bytes.
 138 " d_@
 139                         }
 140                         $ui_diff insert end $content
 141                         if {$sz > $max_sz} {
 142                                 $ui_diff insert end "
 143 * Untracked file clipped here by [appname].
 144 * To see the entire file, use an external editor.
 145 " d_@
 146                         }
 147                 }
 148                 $ui_diff conf -state disabled
 149                 set diff_active 0
 150                 unlock_index
 151                 ui_ready
 152                 return
 153         }
 154
 155         set cmd [list]
 156         if {$w eq $ui_index} {
 157                 lappend cmd diff-index
 158                 lappend cmd --cached
 159         } elseif {$w eq $ui_workdir} {
 160                 if {[string index $m 0] eq {U}} {
 161                         lappend cmd diff
 162                 } else {
 163                         lappend cmd diff-files
 164                 }
 165         }
 166
 167         lappend cmd -p
 168         lappend cmd --no-color
 169         if {$repo_config(gui.diffcontext) >= 0} {
 170                 lappend cmd "-U$repo_config(gui.diffcontext)"
 171         }
 172         if {$w eq $ui_index} {
 173                 lappend cmd [PARENT]
 174         }
 175         lappend cmd --
 176         lappend cmd $path
 177
 178         if {[catch {set fd [eval git_read --nice $cmd]} err]} {
 179                 set diff_active 0
 180                 unlock_index
 181                 ui_status "Unable to display [escape_path $path]"
 182                 error_popup "Error loading diff:\n\n$err"
 183                 return
 184         }
 185
 186         fconfigure $fd \
 187                 -blocking 0 \
 188                 -encoding binary \
 189                 -translation binary
 190         fileevent $fd readable [list read_diff $fd]
 191 }
 192
 193 proc read_diff {fd} {
 194         global ui_diff diff_active
 195         global is_3way_diff current_diff_header
 196
 197         $ui_diff conf -state normal
 198         while {[gets $fd line] >= 0} {
 199                 # -- Cleanup uninteresting diff header lines.
 200                 #
 201                 if {   [string match {diff --git *}      $line]
 202                         || [string match {diff --cc *}       $line]
 203                         || [string match {diff --combined *} $line]
 204                         || [string match {--- *}             $line]
 205                         || [string match {+++ *}             $line]} {
 206                         append current_diff_header $line "\n"
 207                         continue
 208                 }
 209                 if {[string match {index *} $line]} continue
 210                 if {$line eq {deleted file mode 120000}} {
 211                         set line "deleted symlink"
 212                 }
 213
 214                 # -- Automatically detect if this is a 3 way diff.
 215                 #
 216                 if {[string match {@@@ *} $line]} {set is_3way_diff 1}
 217
 218                 if {[string match {mode *} $line]
 219                         || [string match {new file *} $line]
 220                         || [string match {deleted file *} $line]
 221                         || [string match {deleted symlink} $line]
 222                         || [string match {Binary files * and * differ} $line]
 223                         || $line eq {\ No newline at end of file}
 224                         || [regexp {^\* Unmerged path } $line]} {
 225                         set tags {}
 226                 } elseif {$is_3way_diff} {
 227                         set op [string range $line 0 1]
 228                         switch -- $op {
 229                         {  } {set tags {}}
 230                         {@@} {set tags d_@}
 231                         { +} {set tags d_s+}
 232                         { -} {set tags d_s-}
 233                         {+ } {set tags d_+s}
 234                         {- } {set tags d_-s}
 235                         {--} {set tags d_--}
 236                         {++} {
 237                                 if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
 238                                         set line [string replace $line 0 1 {  }]
 239                                         set tags d$op
 240                                 } else {
 241                                         set tags d_++
 242                                 }
 243                         }
 244                         default {
 245                                 puts "error: Unhandled 3 way diff marker: {$op}"
 246                                 set tags {}
 247                         }
 248                         }
 249                 } else {
 250                         set op [string index $line 0]
 251                         switch -- $op {
 252                         { } {set tags {}}
 253                         {@} {set tags d_@}
 254                         {-} {set tags d_-}
 255                         {+} {
 256                                 if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
 257                                         set line [string replace $line 0 0 { }]
 258                                         set tags d$op
 259                                 } else {
 260                                         set tags d_+
 261                                 }
 262                         }
 263                         default {
 264                                 puts "error: Unhandled 2 way diff marker: {$op}"
 265                                 set tags {}
 266                         }
 267                         }
 268                 }
 269                 $ui_diff insert end $line $tags
 270                 if {[string index $line end] eq "\r"} {
 271                         $ui_diff tag add d_cr {end - 2c}
 272                 }
 273                 $ui_diff insert end "\n" $tags
 274         }
 275         $ui_diff conf -state disabled
 276
 277         if {[eof $fd]} {
 278                 close $fd
 279                 set diff_active 0
 280                 unlock_index
 281                 ui_ready
 282
 283                 if {[$ui_diff index end] eq {2.0}} {
 284                         handle_empty_diff
 285                 }
 286         }
 287 }
 288
 289 proc apply_hunk {x y} {
 290         global current_diff_path current_diff_header current_diff_side
 291         global ui_diff ui_index file_states
 292
 293         if {$current_diff_path eq {} || $current_diff_header eq {}} return
 294         if {![lock_index apply_hunk]} return
 295
 296         set apply_cmd {apply --cached --whitespace=nowarn}
 297         set mi [lindex $file_states($current_diff_path) 0]
 298         if {$current_diff_side eq $ui_index} {
 299                 set mode unstage
 300                 lappend apply_cmd --reverse
 301                 if {[string index $mi 0] ne {M}} {
 302                         unlock_index
 303                         return
 304                 }
 305         } else {
 306                 set mode stage
 307                 if {[string index $mi 1] ne {M}} {
 308                         unlock_index
 309                         return
 310                 }
 311         }
 312
 313         set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
 314         set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
 315         if {$s_lno eq {}} {
 316                 unlock_index
 317                 return
 318         }
 319
 320         set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
 321         if {$e_lno eq {}} {
 322                 set e_lno end
 323         }
 324
 325         if {[catch {
 326                 set p [eval git_write $apply_cmd]
 327                 fconfigure $p -translation binary -encoding binary
 328                 puts -nonewline $p $current_diff_header
 329                 puts -nonewline $p [$ui_diff get $s_lno $e_lno]
 330                 close $p} err]} {
 331                 error_popup "Failed to $mode selected hunk.\n\n$err"
 332                 unlock_index
 333                 return
 334         }
 335
 336         $ui_diff conf -state normal
 337         $ui_diff delete $s_lno $e_lno
 338         $ui_diff conf -state disabled
 339
 340         if {[$ui_diff get 1.0 end] eq "\n"} {
 341                 set o _
 342         } else {
 343                 set o ?
 344         }
 345
 346         if {$current_diff_side eq $ui_index} {
 347                 set mi ${o}M
 348         } elseif {[string index $mi 0] eq {_}} {
 349                 set mi M$o
 350         } else {
 351                 set mi ?$o
 352         }
 353         unlock_index
 354         display_file $current_diff_path $mi
 355         if {$o eq {_}} {
 356                 clear_diff
 357         }
 358 }