# git-gui diff viewer
# Copyright (C) 2006, 2007 Shawn Pearce
proc apply_tab_size {{firsttab {}}} {
global have_tk85 repo_config ui_diff
set w [font measure font_diff "0"]
if {$have_tk85 && $firsttab != 0} {
$ui_diff configure -tabs [list [expr {$firsttab * $w}] [expr {($firsttab + $repo_config(gui.tabsize)) * $w}]]
} elseif {$have_tk85 || $repo_config(gui.tabsize) != 8} {
$ui_diff configure -tabs [expr {$repo_config(gui.tabsize) * $w}]
} else {
$ui_diff configure -tabs {}
}
}
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]
apply_tab_size 0
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 $cont_info
}
global current_diff_path selected_paths
set selected_paths($current_diff_path) 1
}
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 \
"* [mc "Git Repository (subproject)"]\n" \
d_info
} 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_info
}
if {[string first "\0" $content] != -1} {
$ui_diff insert end \
[mc "* Binary file (not showing content)."] \
d_info
} else {
if {$sz > $max_sz} {
$ui_diff insert end [mc \
"* Untracked file is %d bytes.
* Showing only first %d bytes.
" $sz $max_sz] d_info
}
$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_info
}
}
$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 conflict_size [gitattr $path conflict-marker-size 7]
set cmd [list]
if {$w eq $ui_index} {
lappend cmd diff-index
lappend cmd --cached
if {[git-version >= "1.7.2"]} {
lappend cmd --ignore-submodules=dirty
}
} elseif {$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 --color
set cmd [concat $cmd $repo_config(gui.diffopts)]
if {$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
# Detect pre-image lines of the diff3 conflict-style. They are just
# '++' lines which is not bijective. Thus, we need to maintain a state
# across lines.
set ::conflict_in_pre_image 0
fconfigure $fd \
-blocking 0 \
-encoding [get_path_encoding $path] \
-translation lf
fileevent $fd readable [list read_diff $fd $conflict_size $cont_info]
}
proc parse_color_line {line} {
set start 0
set result ""
set markup [list]
set regexp {\033\[((?:\d+;)*\d+)?m}
set need_reset 0
while {[regexp -indices -start $start $regexp $line match code]} {
foreach {begin end} $match break
append result [string range $line $start [expr {$begin - 1}]]
set pos [string length $result]
set col [eval [linsert $code 0 string range $line]]
set start [incr end]
if {$col eq "0" || $col eq ""} {
if {!$need_reset} continue
set need_reset 0
} else {
set need_reset 1
}
lappend markup $pos $col
}
append result [string range $line $start end]
if {[llength $markup] < 4} {set markup {}}
return [list $result $markup]
}
proc read_diff {fd conflict_size 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} {
foreach {line markup} [parse_color_line $line] break
set line [string map {\033 ^} $line]
set tags {}
# -- Check for start of diff header.
if { [string match {diff --git *} $line]
|| [string match {diff --cc *} $line]
|| [string match {diff --combined *} $line]} {
set ::current_diff_inheader 1
}
# -- Check for end of diff header (any hunk line will do this).
#
if {[regexp {^@@+ } $line]} {set ::current_diff_inheader 0}
# -- Automatically detect if this is a 3 way diff.
#
if {[string match {@@@ *} $line]} {
set is_3way_diff 1
apply_tab_size 1
}
if {$::current_diff_inheader} {
# -- These two lines stop a diff header and shouldn't be in there
if { [string match {Binary files * and * differ} $line]
|| [regexp {^\* Unmerged path } $line]} {
set ::current_diff_inheader 0
} else {
append current_diff_header $line "\n"
}
# -- Cleanup uninteresting diff header lines.
#
if { [string match {diff --git *} $line]
|| [string match {diff --cc *} $line]
|| [string match {diff --combined *} $line]
|| [string match {--- *} $line]
|| [string match {+++ *} $line]
|| [string match {index *} $line]} {
continue
}
# -- Name it symlink, not 120000
# Note, that the original line is in $current_diff_header
regsub {^(deleted|new) file mode 120000} $line {\1 symlink} line
} elseif { $line eq {\ No newline at end of file}} {
# -- Handle some special lines
} elseif {$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_--}
{++} {
set regexp [string map [list %conflict_size $conflict_size]\
{^\+\+([<>=|]){%conflict_size}(?: |$)}]
if {[regexp $regexp $line _g op]} {
set is_conflict_diff 1
set line [string replace $line 0 1 { }]
set tags d$op
# The ||| conflict-marker marks the start of the pre-image.
# All those lines are also prefixed with '++'. Thus we need
# to maintain this state.
set ::conflict_in_pre_image [expr {$op eq {|}}]
} elseif {$::conflict_in_pre_image} {
# This is a pre-image line. It is the one which both sides
# are based on. As it has also the '++' line start, it is
# normally shown as 'added'. Invert this to '--' to make
# it a 'removed' line.
set line [string replace $line 0 1 {--}]
set tags d_--
} else {
set tags d_++
}
}
default {
puts "error: Unhandled 3 way diff marker: {$op}"
set tags {}
}
}
} elseif {$is_submodule_diff} {
if {$line == ""} continue
if {[regexp {^Submodule } $line]} {
set tags d_info
} elseif {[regexp {^\* } $line]} {
set line [string replace $line 0 1 {Submodule }]
set tags d_info
} 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_-}
{+} {
set regexp [string map [list %conflict_size $conflict_size]\
{^\+([<>=]){%conflict_size}(?: |$)}]
if {[regexp $regexp $line _g op]} {
set is_conflict_diff 1
set tags d$op
} else {
set tags d_+
}
}
default {
puts "error: Unhandled 2 way diff marker: {$op}"
set tags {}
}
}
}
set mark [$ui_diff index "end - 1 line linestart"]
$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
foreach {posbegin colbegin posend colend} $markup {
set prefix clr
foreach style [lsort -integer [split $colbegin ";"]] {
if {$style eq "7"} {append prefix i; continue}
if {$style != 4 && ($style < 30 || $style > 47)} {continue}
set a "$mark linestart + $posbegin chars"
set b "$mark linestart + $posend chars"
catch {$ui_diff tag add $prefix$style $a $b}
}
}
}
$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 $callback
}
}
}
proc apply_or_revert_hunk {x y revert} {
global current_diff_path current_diff_header current_diff_side
global ui_diff ui_index file_states last_revert last_revert_enc
if {$current_diff_path eq {} || $current_diff_header eq {}} return
if {![lock_index apply_hunk]} return
set apply_cmd {apply --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 --cached
if {[string index $mi 0] ne {M}} {
unlock_index
return
}
} else {
if {$revert} {
set failed_msg [mc "Failed to revert selected hunk."]
lappend apply_cmd --reverse
} else {
set failed_msg [mc "Failed to stage selected hunk."]
lappend apply_cmd --cached
}
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 {$e_lno eq {}} {
set e_lno end
}
set wholepatch "$current_diff_header[$ui_diff get $s_lno $e_lno]"
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 $wholepatch
close $p} err]} {
error_popup "$failed_msg\n\n$err"
unlock_index
return
}
if {$revert} {
# Save a copy of this patch for undoing reverts.
set last_revert $wholepatch
set last_revert_enc $enc
}
$ui_diff conf -state normal
$ui_diff delete $s_lno $e_lno
$ui_diff conf -state disabled
# Check if the hunk was the last one in the file.
if {[$ui_diff get 1.0 end] eq "\n"} {
set o _
} else {
set o ?
}
# Update the status flags.
if {$revert} {
set mi [string index $mi 0]$o
} elseif {$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_or_revert_range_or_line {x y revert} {
global current_diff_path current_diff_header current_diff_side
global ui_diff ui_index file_states last_revert
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 --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 --cached
if {[string index $mi 0] ne {M}} {
unlock_index
return
}
} else {
if {$revert} {
set failed_msg [mc "Failed to revert selected line."]
set to_context {+}
lappend apply_cmd --reverse
} else {
set failed_msg [mc "Failed to stage selected line."]
set to_context {-}
lappend apply_cmd --cached
}
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]
set hln [lindex [split $hln " "] 0]
# There is a special situation to take care of. Consider this
# hunk:
#
# @@ -10,4 +10,4 @@
# context before
# -old 1
# -old 2
# +new 1
# +new 2
# context after
#
# We used to keep the context lines in the order they appear in
# the hunk. But then it is not possible to correctly stage only
# "-old 1" and "+new 1" - it would result in this staged text:
#
# context before
# old 2
# new 1
# context after
#
# (By symmetry it is not possible to *un*stage "old 2" and "new
# 2".)
#
# We resolve the problem by introducing an asymmetry, namely,
# when a "+" line is *staged*, it is moved in front of the
# context lines that are generated from the "-" lines that are
# immediately before the "+" block. That is, we construct this
# patch:
#
# @@ -10,4 +10,5 @@
# context before
# +new 1
# old 1
# old 2
# context after
#
# But we do *not* treat "-" lines that are *un*staged in a
# special way.
#
# With this asymmetry it is possible to stage the change "old
# 1" -> "new 1" directly, and to stage the change "old 2" ->
# "new 2" by first staging the entire hunk and then unstaging
# the change "old 1" -> "new 1".
#
# Applying multiple lines adds complexity to the special
# situation. The pre_context must be moved after the entire
# first block of consecutive staged "+" lines, so that
# staging both additions gives the following patch:
#
# @@ -10,4 +10,6 @@
# context before
# +new 1
# +new 2
# old 1
# old 2
# context after
# This is non-empty if and only if we are _staging_ changes;
# then it accumulates the consecutive "-" lines (after
# converting them to context lines) in order to be moved after
# "+" change lines.
set pre_context {}
set n 0
set m 0
set i_l [$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"
# Skip the "\ No newline at end of
# file". Depending on the locale setting
# we don't know what this line looks
# like exactly. The only thing we do
# know is that it starts with "\ "
if {![string match {\\ *} $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 $p} err]} {
error_popup "$failed_msg\n\n$err"
unlock_index
return
}
if {$revert} {
# Save a copy of this patch for undoing reverts.
set last_revert $current_diff_header$wholepatch
set last_revert_enc $enc
}
unlock_index
}
# Undo the last line/hunk reverted. When hunks and lines are reverted, a copy
# of the diff applied is saved. Re-apply that diff to undo the revert.
#
# Right now, we only use a single variable to hold the copy, and not a
# stack/deque for simplicity, so multiple undos are not possible. Maybe this
# can be added if the need for something like this is felt in the future.
proc undo_last_revert {} {
global last_revert current_diff_path current_diff_header
global last_revert_enc
if {$last_revert eq {}} return
if {![lock_index apply_hunk]} return
set apply_cmd {apply --whitespace=nowarn}
set failed_msg [mc "Failed to undo last revert."]
if {[catch {
set enc $last_revert_enc
set p [eval git_write $apply_cmd]
fconfigure $p -translation binary -encoding $enc
puts -nonewline $p $last_revert
close $p} err]} {
error_popup "$failed_msg\n\n$err"
unlock_index
return
}
set last_revert {}
unlock_index
}
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