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                 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 }