diff options
Diffstat (limited to 'git-gui/lib/diff.tcl')
| -rw-r--r-- | git-gui/lib/diff.tcl | 733 |
1 files changed, 733 insertions, 0 deletions
diff --git a/git-gui/lib/diff.tcl b/git-gui/lib/diff.tcl new file mode 100644 index 0000000000..c628750276 --- /dev/null +++ b/git-gui/lib/diff.tcl @@ -0,0 +1,733 @@ +# git-gui diff viewer +# Copyright (C) 2006, 2007 Shawn Pearce + +proc clear_diff {} { + global ui_diff current_diff_path current_diff_header + global ui_index ui_workdir + + $ui_diff conf -state normal + $ui_diff delete 0.0 end + $ui_diff conf -state disabled + + set current_diff_path {} + set current_diff_header {} + + $ui_index tag remove in_diff 0.0 end + $ui_workdir tag remove in_diff 0.0 end +} + +proc reshow_diff {{after {}}} { + global file_states file_lists + global current_diff_path current_diff_side + global ui_diff + + set p $current_diff_path + if {$p eq {}} { + # No diff is being shown. + } elseif {$current_diff_side eq {}} { + clear_diff + } elseif {[catch {set s $file_states($p)}] + || [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} { + + if {[find_next_diff $current_diff_side $p {} {[^O]}]} { + next_diff $after + } else { + clear_diff + } + } else { + set save_pos [lindex [$ui_diff yview] 0] + show_diff $p $current_diff_side {} $save_pos $after + } +} + +proc force_diff_encoding {enc} { + global current_diff_path + + if {$current_diff_path ne {}} { + force_path_encoding $current_diff_path $enc + reshow_diff + } +} + +proc handle_empty_diff {} { + global current_diff_path file_states file_lists + global diff_empty_count + + set path $current_diff_path + set s $file_states($path) + if {[lindex $s 0] ne {_M} || [has_textconv $path]} return + + # Prevent infinite rescan loops + incr diff_empty_count + if {$diff_empty_count > 1} return + + info_popup [mc "No differences detected. + +%s has no changes. + +The modification date of this file was updated by another application, but the content within the file was not changed. + +A rescan will be automatically started to find other files which may have the same state." [short_path $path]] + + clear_diff + display_file $path __ + rescan ui_ready 0 +} + +proc show_diff {path w {lno {}} {scroll_pos {}} {callback {}}} { + global file_states file_lists + global is_3way_diff is_conflict_diff diff_active repo_config + global ui_diff ui_index ui_workdir + global current_diff_path current_diff_side current_diff_header + global current_diff_queue + + if {$diff_active || ![lock_index read]} return + + clear_diff + if {$lno == {}} { + set lno [lsearch -sorted -exact $file_lists($w) $path] + if {$lno >= 0} { + incr lno + } + } + if {$lno >= 1} { + $w tag add in_diff $lno.0 [expr {$lno + 1}].0 + $w see $lno.0 + } + + set s $file_states($path) + set m [lindex $s 0] + set is_conflict_diff 0 + set current_diff_path $path + set current_diff_side $w + set current_diff_queue {} + ui_status [mc "Loading diff of %s..." [escape_path $path]] + + set cont_info [list $scroll_pos $callback] + + if {[string first {U} $m] >= 0} { + merge_load_stages $path [list show_unmerged_diff $cont_info] + } elseif {$m eq {_O}} { + show_other_diff $path $w $m $cont_info + } else { + start_show_diff $cont_info + } +} + +proc show_unmerged_diff {cont_info} { + global current_diff_path current_diff_side + global merge_stages ui_diff is_conflict_diff + global current_diff_queue + + if {$merge_stages(2) eq {}} { + set is_conflict_diff 1 + lappend current_diff_queue \ + [list [mc "LOCAL: deleted\nREMOTE:\n"] d======= \ + [list ":1:$current_diff_path" ":3:$current_diff_path"]] + } elseif {$merge_stages(3) eq {}} { + set is_conflict_diff 1 + lappend current_diff_queue \ + [list [mc "REMOTE: deleted\nLOCAL:\n"] d======= \ + [list ":1:$current_diff_path" ":2:$current_diff_path"]] + } elseif {[lindex $merge_stages(1) 0] eq {120000} + || [lindex $merge_stages(2) 0] eq {120000} + || [lindex $merge_stages(3) 0] eq {120000}} { + set is_conflict_diff 1 + lappend current_diff_queue \ + [list [mc "LOCAL:\n"] d======= \ + [list ":1:$current_diff_path" ":2:$current_diff_path"]] + lappend current_diff_queue \ + [list [mc "REMOTE:\n"] d======= \ + [list ":1:$current_diff_path" ":3:$current_diff_path"]] + } else { + start_show_diff $cont_info + return + } + + advance_diff_queue $cont_info +} + +proc advance_diff_queue {cont_info} { + global current_diff_queue ui_diff + + set item [lindex $current_diff_queue 0] + set current_diff_queue [lrange $current_diff_queue 1 end] + + $ui_diff conf -state normal + $ui_diff insert end [lindex $item 0] [lindex $item 1] + $ui_diff conf -state disabled + + start_show_diff $cont_info [lindex $item 2] +} + +proc show_other_diff {path w m cont_info} { + global file_states file_lists + global is_3way_diff diff_active repo_config + global ui_diff ui_index ui_workdir + global current_diff_path current_diff_side current_diff_header + + # - Git won't give us the diff, there's nothing to compare to! + # + if {$m eq {_O}} { + set max_sz 100000 + set type unknown + if {[catch { + set type [file type $path] + switch -- $type { + directory { + set type submodule + set content {} + set sz 0 + } + link { + set content [file readlink $path] + set sz [string length $content] + } + file { + set fd [open $path r] + fconfigure $fd \ + -eofchar {} \ + -encoding [get_path_encoding $path] + set content [read $fd $max_sz] + close $fd + set sz [file size $path] + } + default { + error "'$type' not supported" + } + } + } err ]} { + set diff_active 0 + unlock_index + ui_status [mc "Unable to display %s" [escape_path $path]] + error_popup [strcat [mc "Error loading file:"] "\n\n$err"] + return + } + $ui_diff conf -state normal + if {$type eq {submodule}} { + $ui_diff insert end [append \ + "* " \ + [mc "Git Repository (subproject)"] \ + "\n"] d_@ + } elseif {![catch {set type [exec file $path]}]} { + set n [string length $path] + if {[string equal -length $n $path $type]} { + set type [string range $type $n end] + regsub {^:?\s*} $type {} type + } + $ui_diff insert end "* $type\n" d_@ + } + if {[string first "\0" $content] != -1} { + $ui_diff insert end \ + [mc "* Binary file (not showing content)."] \ + d_@ + } else { + if {$sz > $max_sz} { + $ui_diff insert end [mc \ +"* Untracked file is %d bytes. +* Showing only first %d bytes. +" $sz $max_sz] d_@ + } + $ui_diff insert end $content + if {$sz > $max_sz} { + $ui_diff insert end [mc " +* Untracked file clipped here by %s. +* To see the entire file, use an external editor. +" [appname]] d_@ + } + } + $ui_diff conf -state disabled + set diff_active 0 + unlock_index + set scroll_pos [lindex $cont_info 0] + if {$scroll_pos ne {}} { + update + $ui_diff yview moveto $scroll_pos + } + ui_ready + set callback [lindex $cont_info 1] + if {$callback ne {}} { + eval $callback + } + return + } +} + +proc start_show_diff {cont_info {add_opts {}}} { + global file_states file_lists + global is_3way_diff is_submodule_diff diff_active repo_config + global ui_diff ui_index ui_workdir + global current_diff_path current_diff_side current_diff_header + + set path $current_diff_path + set w $current_diff_side + + set s $file_states($path) + set m [lindex $s 0] + set is_3way_diff 0 + set is_submodule_diff 0 + set diff_active 1 + set current_diff_header {} + + set cmd [list] + if {$w eq $ui_index} { + lappend cmd diff-index + lappend cmd --cached + } elseif {$w eq $ui_workdir} { + if {[string first {U} $m] >= 0} { + lappend cmd diff + } else { + lappend cmd diff-files + } + } + if {![is_config_false gui.textconv] && [git-version >= 1.6.1]} { + lappend cmd --textconv + } + + if {[string match {160000 *} [lindex $s 2]] + || [string match {160000 *} [lindex $s 3]]} { + set is_submodule_diff 1 + + if {[git-version >= "1.6.6"]} { + lappend cmd --submodule + } + } + + lappend cmd -p + lappend cmd --no-color + if {$repo_config(gui.diffcontext) >= 1} { + lappend cmd "-U$repo_config(gui.diffcontext)" + } + if {$w eq $ui_index} { + lappend cmd [PARENT] + } + if {$add_opts ne {}} { + eval lappend cmd $add_opts + } else { + lappend cmd -- + lappend cmd $path + } + + if {$is_submodule_diff && [git-version < "1.6.6"]} { + if {$w eq $ui_index} { + set cmd [list submodule summary --cached -- $path] + } else { + set cmd [list submodule summary --files -- $path] + } + } + + if {[catch {set fd [eval git_read --nice $cmd]} err]} { + set diff_active 0 + unlock_index + ui_status [mc "Unable to display %s" [escape_path $path]] + error_popup [strcat [mc "Error loading diff:"] "\n\n$err"] + return + } + + set ::current_diff_inheader 1 + fconfigure $fd \ + -blocking 0 \ + -encoding [get_path_encoding $path] \ + -translation lf + fileevent $fd readable [list read_diff $fd $cont_info] +} + +proc read_diff {fd cont_info} { + global ui_diff diff_active is_submodule_diff + global is_3way_diff is_conflict_diff current_diff_header + global current_diff_queue + global diff_empty_count + + $ui_diff conf -state normal + while {[gets $fd line] >= 0} { + # -- Cleanup uninteresting diff header lines. + # + if {$::current_diff_inheader} { + if { [string match {diff --git *} $line] + || [string match {diff --cc *} $line] + || [string match {diff --combined *} $line] + || [string match {--- *} $line] + || [string match {+++ *} $line]} { + append current_diff_header $line "\n" + continue + } + } + if {[string match {index *} $line]} continue + if {$line eq {deleted file mode 120000}} { + set line "deleted symlink" + } + set ::current_diff_inheader 0 + + # -- Automatically detect if this is a 3 way diff. + # + if {[string match {@@@ *} $line]} {set is_3way_diff 1} + + if {[string match {mode *} $line] + || [string match {new file *} $line] + || [regexp {^(old|new) mode *} $line] + || [string match {deleted file *} $line] + || [string match {deleted symlink} $line] + || [string match {Binary files * and * differ} $line] + || $line eq {\ No newline at end of file} + || [regexp {^\* Unmerged path } $line]} { + set tags {} + } elseif {$is_3way_diff} { + set op [string range $line 0 1] + switch -- $op { + { } {set tags {}} + {@@} {set tags d_@} + { +} {set tags d_s+} + { -} {set tags d_s-} + {+ } {set tags d_+s} + {- } {set tags d_-s} + {--} {set tags d_--} + {++} { + if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} { + set is_conflict_diff 1 + set line [string replace $line 0 1 { }] + set tags d$op + } else { + set tags d_++ + } + } + default { + puts "error: Unhandled 3 way diff marker: {$op}" + set tags {} + } + } + } elseif {$is_submodule_diff} { + if {$line == ""} continue + if {[regexp {^Submodule } $line]} { + set tags d_@ + } elseif {[regexp {^\* } $line]} { + set line [string replace $line 0 1 {Submodule }] + set tags d_@ + } else { + set op [string range $line 0 2] + switch -- $op { + { <} {set tags d_-} + { >} {set tags d_+} + { W} {set tags {}} + default { + puts "error: Unhandled submodule diff marker: {$op}" + set tags {} + } + } + } + } else { + set op [string index $line 0] + switch -- $op { + { } {set tags {}} + {@} {set tags d_@} + {-} {set tags d_-} + {+} { + if {[regexp {^\+([<>]{7} |={7})} $line _g op]} { + set is_conflict_diff 1 + set tags d$op + } else { + set tags d_+ + } + } + default { + puts "error: Unhandled 2 way diff marker: {$op}" + set tags {} + } + } + } + $ui_diff insert end $line $tags + if {[string index $line end] eq "\r"} { + $ui_diff tag add d_cr {end - 2c} + } + $ui_diff insert end "\n" $tags + } + $ui_diff conf -state disabled + + if {[eof $fd]} { + close $fd + + if {$current_diff_queue ne {}} { + advance_diff_queue $cont_info + return + } + + set diff_active 0 + unlock_index + set scroll_pos [lindex $cont_info 0] + if {$scroll_pos ne {}} { + update + $ui_diff yview moveto $scroll_pos + } + ui_ready + + if {[$ui_diff index end] eq {2.0}} { + handle_empty_diff + } else { + set diff_empty_count 0 + } + + set callback [lindex $cont_info 1] + if {$callback ne {}} { + eval $callback + } + } +} + +proc apply_hunk {x y} { + global current_diff_path current_diff_header current_diff_side + global ui_diff ui_index file_states + + if {$current_diff_path eq {} || $current_diff_header eq {}} return + if {![lock_index apply_hunk]} return + + set apply_cmd {apply --cached --whitespace=nowarn} + set mi [lindex $file_states($current_diff_path) 0] + if {$current_diff_side eq $ui_index} { + set failed_msg [mc "Failed to unstage selected hunk."] + lappend apply_cmd --reverse + if {[string index $mi 0] ne {M}} { + unlock_index + return + } + } else { + set failed_msg [mc "Failed to stage selected hunk."] + if {[string index $mi 1] ne {M}} { + unlock_index + return + } + } + + set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0] + set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0] + if {$s_lno eq {}} { + unlock_index + return + } + + set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end] + if {$e_lno eq {}} { + set e_lno end + } + + if {[catch { + set enc [get_path_encoding $current_diff_path] + set p [eval git_write $apply_cmd] + fconfigure $p -translation binary -encoding $enc + puts -nonewline $p $current_diff_header + puts -nonewline $p [$ui_diff get $s_lno $e_lno] + close $p} err]} { + error_popup [append $failed_msg "\n\n$err"] + unlock_index + return + } + + $ui_diff conf -state normal + $ui_diff delete $s_lno $e_lno + $ui_diff conf -state disabled + + if {[$ui_diff get 1.0 end] eq "\n"} { + set o _ + } else { + set o ? + } + + if {$current_diff_side eq $ui_index} { + set mi ${o}M + } elseif {[string index $mi 0] eq {_}} { + set mi M$o + } else { + set mi ?$o + } + unlock_index + display_file $current_diff_path $mi + # This should trigger shift to the next changed file + if {$o eq {_}} { + reshow_diff + } +} + +proc apply_range_or_line {x y} { + global current_diff_path current_diff_header current_diff_side + global ui_diff ui_index file_states + + set selected [$ui_diff tag nextrange sel 0.0] + + if {$selected == {}} { + set first [$ui_diff index "@$x,$y"] + set last $first + } else { + set first [lindex $selected 0] + set last [lindex $selected 1] + } + + set first_l [$ui_diff index "$first linestart"] + set last_l [$ui_diff index "$last lineend"] + + if {$current_diff_path eq {} || $current_diff_header eq {}} return + if {![lock_index apply_hunk]} return + + set apply_cmd {apply --cached --whitespace=nowarn} + set mi [lindex $file_states($current_diff_path) 0] + if {$current_diff_side eq $ui_index} { + set failed_msg [mc "Failed to unstage selected line."] + set to_context {+} + lappend apply_cmd --reverse + if {[string index $mi 0] ne {M}} { + unlock_index + return + } + } else { + set failed_msg [mc "Failed to stage selected line."] + set to_context {-} + if {[string index $mi 1] ne {M}} { + unlock_index + return + } + } + + set wholepatch {} + + while {$first_l < $last_l} { + set i_l [$ui_diff search -backwards -regexp ^@@ $first_l 0.0] + if {$i_l eq {}} { + # If there's not a @@ above, then the selected range + # must have come before the first_l @@ + set i_l [$ui_diff search -regexp ^@@ $first_l $last_l] + } + if {$i_l eq {}} { + unlock_index + return + } + # $i_l is now at the beginning of a line + + # pick start line number from hunk header + set hh [$ui_diff get $i_l "$i_l + 1 lines"] + set hh [lindex [split $hh ,] 0] + set hln [lindex [split $hh -] 1] + + # There is a special situation to take care of. Consider this + # hunk: + # + # @@ -10,4 +10,4 @@ + # context before + # -old 1 + # -old 2 + # +new 1 + # +new 2 + # context after + # + # We used to keep the context lines in the order they appear in + # the hunk. But then it is not possible to correctly stage only + # "-old 1" and "+new 1" - it would result in this staged text: + # + # context before + # old 2 + # new 1 + # context after + # + # (By symmetry it is not possible to *un*stage "old 2" and "new + # 2".) + # + # We resolve the problem by introducing an asymmetry, namely, + # when a "+" line is *staged*, it is moved in front of the + # context lines that are generated from the "-" lines that are + # immediately before the "+" block. That is, we construct this + # patch: + # + # @@ -10,4 +10,5 @@ + # context before + # +new 1 + # old 1 + # old 2 + # context after + # + # But we do *not* treat "-" lines that are *un*staged in a + # special way. + # + # With this asymmetry it is possible to stage the change "old + # 1" -> "new 1" directly, and to stage the change "old 2" -> + # "new 2" by first staging the entire hunk and then unstaging + # the change "old 1" -> "new 1". + # + # Applying multiple lines adds complexity to the special + # situation. The pre_context must be moved after the entire + # first block of consecutive staged "+" lines, so that + # staging both additions gives the following patch: + # + # @@ -10,4 +10,6 @@ + # context before + # +new 1 + # +new 2 + # old 1 + # old 2 + # context after + + # This is non-empty if and only if we are _staging_ changes; + # then it accumulates the consecutive "-" lines (after + # converting them to context lines) in order to be moved after + # "+" change lines. + set pre_context {} + + set n 0 + set m 0 + set i_l [$ui_diff index "$i_l + 1 lines"] + set patch {} + while {[$ui_diff compare $i_l < "end - 1 chars"] && + [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} { + set next_l [$ui_diff index "$i_l + 1 lines"] + set c1 [$ui_diff get $i_l] + if {[$ui_diff compare $first_l <= $i_l] && + [$ui_diff compare $i_l < $last_l] && + ($c1 eq {-} || $c1 eq {+})} { + # a line to stage/unstage + set ln [$ui_diff get $i_l $next_l] + if {$c1 eq {-}} { + set n [expr $n+1] + set patch "$patch$pre_context$ln" + set pre_context {} + } else { + set m [expr $m+1] + set patch "$patch$ln" + } + } elseif {$c1 ne {-} && $c1 ne {+}} { + # context line + set ln [$ui_diff get $i_l $next_l] + set patch "$patch$pre_context$ln" + set n [expr $n+1] + set m [expr $m+1] + set pre_context {} + } elseif {$c1 eq $to_context} { + # turn change line into context line + set ln [$ui_diff get "$i_l + 1 chars" $next_l] + if {$c1 eq {-}} { + set pre_context "$pre_context $ln" + } else { + set patch "$patch $ln" + } + set n [expr $n+1] + set m [expr $m+1] + } else { + # a change in the opposite direction of + # to_context which is outside the range of + # lines to apply. + set patch "$patch$pre_context" + set pre_context {} + } + set i_l $next_l + } + set patch "$patch$pre_context" + set wholepatch "$wholepatch@@ -$hln,$n +$hln,$m @@\n$patch" + set first_l [$ui_diff index "$next_l + 1 lines"] + } + + if {[catch { + set enc [get_path_encoding $current_diff_path] + set p [eval git_write $apply_cmd] + fconfigure $p -translation binary -encoding $enc + puts -nonewline $p $current_diff_header + puts -nonewline $p $wholepatch + close $p} err]} { + error_popup [append $failed_msg "\n\n$err"] + } + + unlock_index +} |