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 ui_status_value 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 $path __
  52         rescan {set ui_status_value {Ready.}} 0
  53 }
  54
  55 proc show_diff {path w {lno {}}} {
  56         global file_states file_lists
  57         global is_3way_diff diff_active repo_config
  58         global ui_diff ui_status_value ui_index ui_workdir
  59         global current_diff_path current_diff_side current_diff_header
  60
  61         if {$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         set ui_status_value "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                                 set content [read $fd $max_sz]
  90                                 close $fd
  91                                 set sz [file size $path]
  92                         } err ]} {
  93                         set diff_active 0
  94                         unlock_index
  95                         set ui_status_value "Unable to display [escape_path $path]"
  96                         error_popup "Error loading file:\n\n$err"
  97                         return
  98                 }
  99                 $ui_diff conf -state normal
 100                 if {![catch {set type [exec file $path]}]} {
 101                         set n [string length $path]
 102                         if {[string equal -length $n $path $type]} {
 103                                 set type [string range $type $n end]
 104                                 regsub {^:?\s*} $type {} type
 105                         }
 106                         $ui_diff insert end "* $type\n" d_@
 107                 }
 108                 if {[string first "\0" $content] != -1} {
 109                         $ui_diff insert end \
 110                                 "* Binary file (not showing content)." \
 111                                 d_@
 112                 } else {
 113                         if {$sz > $max_sz} {
 114                                 $ui_diff insert end \
 115 "* Untracked file is $sz bytes.
 116 * Showing only first $max_sz bytes.
 117 " d_@
 118                         }
 119                         $ui_diff insert end $content
 120                         if {$sz > $max_sz} {
 121                                 $ui_diff insert end "
 122 * Untracked file clipped here by [appname].
 123 * To see the entire file, use an external editor.
 124 " d_@
 125                         }
 126                 }
 127                 $ui_diff conf -state disabled
 128                 set diff_active 0
 129                 unlock_index
 130                 set ui_status_value {Ready.}
 131                 return
 132         }
 133
 134         set cmd [list | git]
 135         if {$w eq $ui_index} {
 136                 lappend cmd diff-index
 137                 lappend cmd --cached
 138         } elseif {$w eq $ui_workdir} {
 139                 if {[string index $m 0] eq {U}} {
 140                         lappend cmd diff
 141                 } else {
 142                         lappend cmd diff-files
 143                 }
 144         }
 145
 146         lappend cmd -p
 147         lappend cmd --no-color
 148         if {$repo_config(gui.diffcontext) > 0} {
 149                 lappend cmd "-U$repo_config(gui.diffcontext)"
 150         }
 151         if {$w eq $ui_index} {
 152                 lappend cmd [PARENT]
 153         }
 154         lappend cmd --
 155         lappend cmd $path
 156
 157         if {[catch {set fd [open $cmd r]} err]} {
 158                 set diff_active 0
 159                 unlock_index
 160                 set ui_status_value "Unable to display [escape_path $path]"
 161                 error_popup "Error loading diff:\n\n$err"
 162                 return
 163         }
 164
 165         fconfigure $fd \
 166                 -blocking 0 \
 167                 -encoding binary \
 168                 -translation binary
 169         fileevent $fd readable [list read_diff $fd]
 170 }
 171
 172 proc read_diff {fd} {
 173         global ui_diff ui_status_value diff_active
 174         global is_3way_diff current_diff_header
 175
 176         $ui_diff conf -state normal
 177         while {[gets $fd line] >= 0} {
 178                 # -- Cleanup uninteresting diff header lines.
 179                 #
 180                 if {   [string match {diff --git *}      $line]
 181                         || [string match {diff --cc *}       $line]
 182                         || [string match {diff --combined *} $line]
 183                         || [string match {--- *}             $line]
 184                         || [string match {+++ *}             $line]} {
 185                         append current_diff_header $line "\n"
 186                         continue
 187                 }
 188                 if {[string match {index *} $line]} continue
 189                 if {$line eq {deleted file mode 120000}} {
 190                         set line "deleted symlink"
 191                 }
 192
 193                 # -- Automatically detect if this is a 3 way diff.
 194                 #
 195                 if {[string match {@@@ *} $line]} {set is_3way_diff 1}
 196
 197                 if {[string match {mode *} $line]
 198                         || [string match {new file *} $line]
 199                         || [string match {deleted file *} $line]
 200                         || [string match {Binary files * and * differ} $line]
 201                         || $line eq {\ No newline at end of file}
 202                         || [regexp {^\* Unmerged path } $line]} {
 203                         set tags {}
 204                 } elseif {$is_3way_diff} {
 205                         set op [string range $line 0 1]
 206                         switch -- $op {
 207                         {  } {set tags {}}
 208                         {@@} {set tags d_@}
 209                         { +} {set tags d_s+}
 210                         { -} {set tags d_s-}
 211                         {+ } {set tags d_+s}
 212                         {- } {set tags d_-s}
 213                         {--} {set tags d_--}
 214                         {++} {
 215                                 if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
 216                                         set line [string replace $line 0 1 {  }]
 217                                         set tags d$op
 218                                 } else {
 219                                         set tags d_++
 220                                 }
 221                         }
 222                         default {
 223                                 puts "error: Unhandled 3 way diff marker: {$op}"
 224                                 set tags {}
 225                         }
 226                         }
 227                 } else {
 228                         set op [string index $line 0]
 229                         switch -- $op {
 230                         { } {set tags {}}
 231                         {@} {set tags d_@}
 232                         {-} {set tags d_-}
 233                         {+} {
 234                                 if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
 235                                         set line [string replace $line 0 0 { }]
 236                                         set tags d$op
 237                                 } else {
 238                                         set tags d_+
 239                                 }
 240                         }
 241                         default {
 242                                 puts "error: Unhandled 2 way diff marker: {$op}"
 243                                 set tags {}
 244                         }
 245                         }
 246                 }
 247                 $ui_diff insert end $line $tags
 248                 if {[string index $line end] eq "\r"} {
 249                         $ui_diff tag add d_cr {end - 2c}
 250                 }
 251                 $ui_diff insert end "\n" $tags
 252         }
 253         $ui_diff conf -state disabled
 254
 255         if {[eof $fd]} {
 256                 close $fd
 257                 set diff_active 0
 258                 unlock_index
 259                 set ui_status_value {Ready.}
 260
 261                 if {[$ui_diff index end] eq {2.0}} {
 262                         handle_empty_diff
 263                 }
 264         }
 265 }
 266
 267 proc apply_hunk {x y} {
 268         global current_diff_path current_diff_header current_diff_side
 269         global ui_diff ui_index file_states
 270
 271         if {$current_diff_path eq {} || $current_diff_header eq {}} return
 272         if {![lock_index apply_hunk]} return
 273
 274         set apply_cmd {git apply --cached --whitespace=nowarn}
 275         set mi [lindex $file_states($current_diff_path) 0]
 276         if {$current_diff_side eq $ui_index} {
 277                 set mode unstage
 278                 lappend apply_cmd --reverse
 279                 if {[string index $mi 0] ne {M}} {
 280                         unlock_index
 281                         return
 282                 }
 283         } else {
 284                 set mode stage
 285                 if {[string index $mi 1] ne {M}} {
 286                         unlock_index
 287                         return
 288                 }
 289         }
 290
 291         set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
 292         set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
 293         if {$s_lno eq {}} {
 294                 unlock_index
 295                 return
 296         }
 297
 298         set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
 299         if {$e_lno eq {}} {
 300                 set e_lno end
 301         }
 302
 303         if {[catch {
 304                 set p [open "| $apply_cmd" w]
 305                 fconfigure $p -translation binary -encoding binary
 306                 puts -nonewline $p $current_diff_header
 307                 puts -nonewline $p [$ui_diff get $s_lno $e_lno]
 308                 close $p} err]} {
 309                 error_popup "Failed to $mode selected hunk.\n\n$err"
 310                 unlock_index
 311                 return
 312         }
 313
 314         $ui_diff conf -state normal
 315         $ui_diff delete $s_lno $e_lno
 316         $ui_diff conf -state disabled
 317
 318         if {[$ui_diff get 1.0 end] eq "\n"} {
 319                 set o _
 320         } else {
 321                 set o ?
 322         }
 323
 324         if {$current_diff_side eq $ui_index} {
 325                 set mi ${o}M
 326         } elseif {[string index $mi 0] eq {_}} {
 327                 set mi M$o
 328         } else {
 329                 set mi ?$o
 330         }
 331         unlock_index
 332         display_file $current_diff_path $mi
 333         if {$o eq {_}} {
 334                 clear_diff
 335         }
 336 }