git-gui: Remove the loaded column from the blame viewer
[gitweb.git] / lib / blame.tcl
index f48624a99eba8820230c7f30e6e9f802af1890ad..ca73ba7d14f608dd705d25093b8c6d312b9d1642 100644 (file)
@@ -3,17 +3,23 @@
 
 class blame {
 
-field commit  ; # input commit to blame
-field path    ; # input filename to view in $commit
-
-field w
-field w_line
-field w_cgrp
-field w_load
-field w_file
-field w_cmit
-field status
-
+image create photo ::blame::img_back_arrow -data {R0lGODlhGAAYAIUAAPwCBEzKXFTSZIz+nGzmhGzqfGTidIT+nEzGXHTqhGzmfGzifFzadETCVES+VARWDFzWbHzyjAReDGTadFTOZDSyRDyyTCymPARaFGTedFzSbDy2TCyqRCyqPARaDAyCHES6VDy6VCyiPAR6HCSeNByWLARyFARiDARqFGTifARiFAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAAAAALAAAAAAYABgAAAajQIBwSCwaj8ikcsk0BppJwRPqHEypQwHBis0WDAdEFyBIKBaMAKLBdjQeSkFBYTBAIvgEoS6JmhUTEwIUDQ4VFhcMGEhyCgoZExoUaxsWHB0THkgfAXUGAhoBDSAVFR0XBnCbDRmgog0hpSIiDJpJIyEQhBUcJCIlwA22SSYVogknEg8eD82qSigdDSknY0IqJQXPYxIl1dZCGNvWw+Dm510GQQAh/mhDcmVhdGVkIGJ5IEJNUFRvR0lGIFBybyB2ZXJzaW9uIDIuNQ0KqSBEZXZlbENvciAxOTk3LDE5OTguIEFsbCByaWdodHMgcmVzZXJ2ZWQuDQpodHRwOi8vd3d3LmRldmVsY29yLmNvbQA7}
+
+field commit    ; # input commit to blame
+field path      ; # input filename to view in $commit
+field history {}; # viewer history: {commit path}
+
+field w          ; # top window in this viewer
+field w_back     ; # our back button
+field w_path     ; # label showing the current file path
+field w_line     ; # text column: all line numbers
+field w_cgrp     ; # text column: abbreviated commit SHA-1s
+field w_file     ; # text column: actual file data
+field w_cmit     ; # pane showing commit message
+field status     ; # text variable bound to status bar
+field old_height ; # last known height of $w.file_pane
+
+field current_fd       {} ; # background process running
 field highlight_line   -1 ; # current line selected
 field highlight_commit {} ; # sha1 of commit selected
 
@@ -31,6 +37,11 @@ field r_orig_line   ; # original line number
 field r_final_line  ; # final line number
 field r_line_count  ; # lines in this region
 
+field tooltip_wm     {} ; # Current tooltip toplevel, if open
+field tooltip_timer  {} ; # Current timer event for our tooltip
+field tooltip_commit {} ; # Commit in tooltip
+field tooltip_text   {} ; # Text in current tooltip
+
 variable active_color #98e1a0
 variable group_colors {
        #cbcbcb
@@ -38,33 +49,70 @@ variable group_colors {
 }
 
 constructor new {i_commit i_path} {
+       variable active_color
+       global cursor_ptr
+
        set commit $i_commit
        set path   $i_path
 
        make_toplevel top w
        wm title $top "[appname] ([reponame]): File Viewer"
-       set status "Loading $commit:$path..."
 
-       label $w.path -text "$commit:$path" \
+       frame $w.header -background orange
+       label $w.header.commit_l \
+               -text {Commit:} \
+               -background orange \
                -anchor w \
-               -justify left \
-               -borderwidth 1 \
-               -relief sunken \
-               -font font_uibold
-       pack $w.path -side top -fill x
-
-       frame $w.out
-       set w_load $w.out.loaded_t
-       text $w_load \
-               -background white -borderwidth 0 \
+               -justify left
+       set w_back $w.header.commit_b
+       label $w_back \
+               -image ::blame::img_back_arrow \
+               -borderwidth 0 \
+               -relief flat \
                -state disabled \
-               -wrap none \
-               -height 40 \
-               -width 1 \
-               -font font_diff
-       $w_load tag conf annotated -background grey
-
-       set w_line $w.out.linenumber_t
+               -background orange \
+               -activebackground orange
+       bind $w_back <Button-1> "
+               if {\[$w_back cget -state\] eq {normal}} {
+                       [cb _history_menu]
+               }
+               "
+       label $w.header.commit \
+               -textvariable @commit \
+               -background orange \
+               -anchor w \
+               -justify left
+       label $w.header.path_l \
+               -text {File:} \
+               -background orange \
+               -anchor w \
+               -justify left
+       set w_path $w.header.path
+       label $w_path \
+               -background orange \
+               -anchor w \
+               -justify left
+       pack $w.header.commit_l -side left
+       pack $w_back -side left
+       pack $w.header.commit -side left
+       pack $w_path -fill x -side right
+       pack $w.header.path_l -side right
+
+       panedwindow $w.file_pane -orient vertical
+       frame $w.file_pane.out
+       frame $w.file_pane.cm
+       $w.file_pane add $w.file_pane.out \
+               -sticky nsew \
+               -minsize 100 \
+               -height 100 \
+               -width 100
+       $w.file_pane add $w.file_pane.cm \
+               -sticky nsew \
+               -minsize 25 \
+               -height 25 \
+               -width 100
+
+       set w_line $w.file_pane.out.linenumber_t
        text $w_line \
                -background white -borderwidth 0 \
                -state disabled \
@@ -74,7 +122,7 @@ constructor new {i_commit i_path} {
                -font font_diff
        $w_line tag conf linenumber -justify right
 
-       set w_cgrp $w.out.commit_t
+       set w_cgrp $w.file_pane.out.commit_t
        text $w_cgrp \
                -background white -borderwidth 0 \
                -state disabled \
@@ -82,21 +130,30 @@ constructor new {i_commit i_path} {
                -height 40 \
                -width 4 \
                -font font_diff
-
-       set w_file $w.out.file_t
+       $w_cgrp tag conf curr_commit
+       $w_cgrp tag conf prior_commit \
+               -foreground blue \
+               -underline 1
+       $w_cgrp tag bind prior_commit \
+               <Button-1> \
+               "[cb _load_commit @%x,%y];break"
+
+       set w_file $w.file_pane.out.file_t
        text $w_file \
                -background white -borderwidth 0 \
                -state disabled \
                -wrap none \
                -height 40 \
                -width 80 \
-               -xscrollcommand [list $w.out.sbx set] \
+               -xscrollcommand [list $w.file_pane.out.sbx set] \
                -font font_diff
 
-       scrollbar $w.out.sbx -orient h -command [list $w_file xview]
-       scrollbar $w.out.sby -orient v \
+       scrollbar $w.file_pane.out.sbx \
+               -orient h \
+               -command [list $w_file xview]
+       scrollbar $w.file_pane.out.sby \
+               -orient v \
                -command [list scrollbar2many [list \
-               $w_load \
                $w_line \
                $w_cgrp \
                $w_file \
@@ -104,40 +161,49 @@ constructor new {i_commit i_path} {
        grid \
                $w_cgrp \
                $w_line \
-               $w_load \
                $w_file \
-               $w.out.sby \
+               $w.file_pane.out.sby \
                -sticky nsew
-       grid conf $w.out.sbx -column 3 -sticky we
-       grid columnconfigure $w.out 3 -weight 1
-       grid rowconfigure $w.out 0 -weight 1
-       pack $w.out -fill both -expand 1
-
-       label $w.status \
-               -textvariable @status \
-               -anchor w \
-               -justify left \
-               -borderwidth 1 \
-               -relief sunken
-       pack $w.status -side bottom -fill x
+       grid conf $w.file_pane.out.sbx -column 2 -sticky we
+       grid columnconfigure $w.file_pane.out 2 -weight 1
+       grid rowconfigure $w.file_pane.out 0 -weight 1
 
-       frame $w.cm
-       set w_cmit $w.cm.t
+       set w_cmit $w.file_pane.cm.t
        text $w_cmit \
                -background white -borderwidth 0 \
                -state disabled \
                -wrap none \
                -height 10 \
                -width 80 \
-               -xscrollcommand [list $w.cm.sbx set] \
-               -yscrollcommand [list $w.cm.sby set] \
+               -xscrollcommand [list $w.file_pane.cm.sbx set] \
+               -yscrollcommand [list $w.file_pane.cm.sby set] \
                -font font_diff
-       scrollbar $w.cm.sbx -orient h -command [list $w_cmit xview]
-       scrollbar $w.cm.sby -orient v -command [list $w_cmit yview]
-       pack $w.cm.sby -side right -fill y
-       pack $w.cm.sbx -side bottom -fill x
+       $w_cmit tag conf header_key \
+               -tabs {3c} \
+               -background $active_color \
+               -font font_uibold
+       $w_cmit tag conf header_val \
+               -background $active_color \
+               -font font_ui
+       $w_cmit tag raise sel
+       scrollbar $w.file_pane.cm.sbx \
+               -orient h \
+               -command [list $w_cmit xview]
+       scrollbar $w.file_pane.cm.sby \
+               -orient v \
+               -command [list $w_cmit yview]
+       pack $w.file_pane.cm.sby -side right -fill y
+       pack $w.file_pane.cm.sbx -side bottom -fill x
        pack $w_cmit -expand 1 -fill both
-       pack $w.cm -side bottom -fill x
+
+       frame $w.status \
+               -borderwidth 1 \
+               -relief sunken
+       label $w.status.l \
+               -textvariable @status \
+               -anchor w \
+               -justify left
+       pack $w.status.l -side left
 
        menu $w.ctxm -tearoff 0
        $w.ctxm add command \
@@ -146,18 +212,25 @@ constructor new {i_commit i_path} {
 
        foreach i [list \
                $w_cgrp \
-               $w_load \
                $w_line \
                $w_file] {
+               $i conf -cursor $cursor_ptr
                $i conf -yscrollcommand \
                        [list many2scrollbar [list \
                        $w_cgrp \
-                       $w_load \
                        $w_line \
                        $w_file \
-                       ] yview $w.out.sby]
-               bind $i <Button-1> "[cb _click $i @%x,%y]; focus $i"
+                       ] yview $w.file_pane.out.sby]
+               bind $i <Button-1> "
+                       [cb _hide_tooltip]
+                       [cb _click $i @%x,%y]
+                       focus $i
+               "
+               bind $i <Any-Motion>  [cb _show_tooltip $i @%x,%y]
+               bind $i <Any-Enter>   [cb _hide_tooltip]
+               bind $i <Any-Leave>   [cb _hide_tooltip]
                bind_button3 $i "
+                       [cb _hide_tooltip]
                        set cursorX %x
                        set cursorY %y
                        set cursorW %W
@@ -167,7 +240,6 @@ constructor new {i_commit i_path} {
 
        foreach i [list \
                $w_cgrp \
-               $w_load \
                $w_line \
                $w_file \
                $w_cmit] {
@@ -185,8 +257,88 @@ constructor new {i_commit i_path} {
 
        bind $w_cmit <Button-1> [list focus $w_cmit]
        bind $top <Visibility> [list focus $top]
-       bind $top <Destroy> [list delete_this $this]
+       bind $w_file <Destroy> [list delete_this $this]
+
+       grid configure $w.header -sticky ew
+       grid configure $w.file_pane -sticky nsew
+       grid configure $w.status -sticky ew
+       grid columnconfigure $top 0 -weight 1
+       grid rowconfigure $top 0 -weight 0
+       grid rowconfigure $top 1 -weight 1
+       grid rowconfigure $top 2 -weight 0
+
+       set req_w [winfo reqwidth  $top]
+       set req_h [winfo reqheight $top]
+       if {$req_w < 600} {set req_w 600}
+       if {$req_h < 400} {set req_h 400}
+       set g "${req_w}x${req_h}"
+       wm geometry $top $g
+       update
+
+       set old_height [winfo height $w.file_pane]
+       $w.file_pane sash place 0 \
+               [lindex [$w.file_pane sash coord 0] 0] \
+               [expr {int($old_height * 0.70)}]
+       bind $w.file_pane <Configure> \
+       "if {{$w.file_pane} eq {%W}} {[cb _resize %h]}"
+
+       _load $this
+}
+
+method _load {} {
+       _hide_tooltip $this
+
+       if {$total_lines != 0 || $current_fd ne {}} {
+               if {$current_fd ne {}} {
+                       catch {close $current_fd}
+                       set current_fd {}
+               }
+
+               set highlight_line -1
+               set highlight_commit {}
+               set total_lines 0
+               set blame_lines 0
+               set commit_count 0
+               set commit_list {}
+               array unset order
+               array unset line_commit
+               array unset line_file
+
+               $w_cgrp conf -state normal
+               $w_line conf -state normal
+               $w_file conf -state normal
+
+               $w_cgrp delete 0.0 end
+               $w_line delete 0.0 end
+               $w_file delete 0.0 end
+
+               $w_cgrp conf -state disabled
+               $w_line conf -state disabled
+               $w_file conf -state disabled
+       }
+
+       if {[winfo exists $w.status.c]} {
+               $w.status.c coords bar 0 0 0 20
+       } else {
+               canvas $w.status.c \
+                       -width 100 \
+                       -height [expr {int([winfo reqheight $w.status.l] * 0.6)}] \
+                       -borderwidth 1 \
+                       -relief groove \
+                       -highlightt 0
+               $w.status.c create rectangle 0 0 0 20 -tags bar -fill navy
+               pack $w.status.c -side right
+       }
+
+       if {$history eq {}} {
+               $w_back conf -state disabled
+       } else {
+               $w_back conf -state normal
+       }
+       lappend history [list $commit $path]
 
+       set status "Loading $commit:[escape_path $path]..."
+       $w_path conf -text [escape_path $path]
        if {$commit eq {}} {
                set fd [open $path r]
        } else {
@@ -195,10 +347,55 @@ constructor new {i_commit i_path} {
        }
        fconfigure $fd -blocking 0 -translation lf -encoding binary
        fileevent $fd readable [cb _read_file $fd]
+       set current_fd $fd
+}
+
+method _history_menu {} {
+       set m $w.backmenu
+       if {[winfo exists $m]} {
+               $m delete 0 end
+       } else {
+               menu $m -tearoff 0
+       }
+
+       for {set i [expr {[llength $history] - 2}]
+               } {$i >= 0} {incr i -1} {
+               set e [lindex $history $i]
+               set c [lindex $e 0]
+               set f [lindex $e 1]
+
+               if {[regexp {^[0-9a-f]{40}$} $c]} {
+                       set t [string range $c 0 8]...
+               } else {
+                       set t $c
+               }
+               if {![catch {set summary $header($c,summary)}]} {
+                       append t " $summary"
+                       if {[string length $t] > 70} {
+                               set t [string range $t 0 66]...
+                       }
+               }
+
+               $m add command -label $t -command [cb _goback $i $c $f]
+       }
+       set X [winfo rootx $w_back]
+       set Y [expr {[winfo rooty $w_back] + [winfo height $w_back]}]
+       tk_popup $m $X $Y
+}
+
+method _goback {i c f} {
+       set history [lrange $history 0 [expr {$i - 1}]]
+       set commit $c
+       set path $f
+       _load $this
 }
 
 method _read_file {fd} {
-       $w_load conf -state normal
+       if {$fd ne $current_fd} {
+               catch {close $fd}
+               return
+       }
+
        $w_cgrp conf -state normal
        $w_line conf -state normal
        $w_file conf -state normal
@@ -207,7 +404,6 @@ method _read_file {fd} {
                incr total_lines
 
                if {$total_lines > 1} {
-                       $w_load insert end "\n"
                        $w_cgrp insert end "\n"
                        $w_line insert end "\n"
                        $w_file insert end "\n"
@@ -216,7 +412,6 @@ method _read_file {fd} {
                $w_line insert end "$total_lines" linenumber
                $w_file insert end "$line"
        }
-       $w_load conf -state disabled
        $w_cgrp conf -state disabled
        $w_line conf -state disabled
        $w_file conf -state disabled
@@ -224,7 +419,7 @@ method _read_file {fd} {
        if {[eof $fd]} {
                close $fd
                _status $this
-               set cmd [list git blame -M -C --incremental]
+               set cmd {nice git blame -M -C --incremental}
                if {$commit eq {}} {
                        lappend cmd --contents $path
                } else {
@@ -234,12 +429,18 @@ method _read_file {fd} {
                set fd [open "| $cmd" r]
                fconfigure $fd -blocking 0 -translation lf -encoding binary
                fileevent $fd readable [cb _read_blame $fd]
+               set current_fd $fd
        }
 } ifdeleted { catch {close $fd} }
 
 method _read_blame {fd} {
        variable group_colors
 
+       if {$fd ne $current_fd} {
+               catch {close $fd}
+               return
+       }
+
        $w_cgrp conf -state normal
        while {[gets $fd line] >= 0} {
                if {[regexp {^([a-z0-9]{40}) (\d+) (\d+) (\d+)$} $line line \
@@ -267,13 +468,52 @@ method _read_blame {fd} {
                        set n    $r_line_count
                        set lno  $r_final_line
                        set cmit $r_commit
-                       set abbr [string range $cmit 0 4]
+
+                       if {[regexp {^0{40}$} $cmit]} {
+                               set commit_abbr work
+                               set commit_type curr_commit
+                       } elseif {$cmit eq $commit} {
+                               set commit_abbr this
+                               set commit_type curr_commit
+                       } else {
+                               set commit_type prior_commit
+                               set commit_abbr [string range $cmit 0 4]
+                       }
+
+                       set author_abbr {}
+                       set a_name {}
+                       catch {set a_name $header($cmit,author)}
+                       while {$a_name ne {}} {
+                               if {![regexp {^([[:upper:]])} $a_name _a]} break
+                               append author_abbr $_a
+                               unset _a
+                               if {![regsub \
+                                       {^[[:upper:]][^\s]*\s+} \
+                                       $a_name {} a_name ]} break
+                       }
+                       if {$author_abbr eq {}} {
+                               set author_abbr { |}
+                       } else {
+                               set author_abbr [string range $author_abbr 0 3]
+                               while {[string length $author_abbr] < 4} {
+                                       set author_abbr " $author_abbr"
+                               }
+                       }
+                       unset a_name
+
+                       set first_lno $lno
+                       while {
+                          ![catch {set ncmit $line_commit([expr {$first_lno - 1}])}]
+                       && ![catch {set nfile $line_file([expr {$first_lno - 1}])}]
+                       && $ncmit eq $cmit
+                       && $nfile eq $file
+                       } {
+                               incr first_lno -1
+                       }
 
                        while {$n > 0} {
                                set lno_e "$lno.0 lineend + 1c"
-                               if {[catch {set g g$line_commit($lno)}]} {
-                                       $w_load tag add annotated $lno.0 $lno_e
-                               } else {
+                               if {![catch {set g g$line_commit($lno)}]} {
                                        $w_cgrp tag remove g$g $lno.0 $lno_e
                                        $w_line tag remove g$g $lno.0 $lno_e
                                        $w_file tag remove g$g $lno.0 $lno_e
@@ -286,8 +526,14 @@ method _read_blame {fd} {
                                set line_commit($lno) $cmit
                                set line_file($lno)   $file
 
-                               $w_cgrp delete $lno.0 $lno_e
-                               $w_cgrp insert $lno.0 "$abbr\n"
+                               $w_cgrp delete $lno.0 "$lno.0 lineend"
+                               if {$lno == $first_lno} {
+                                       $w_cgrp insert $lno.0 $commit_abbr $commit_type
+                               } elseif {$lno == [expr {$first_lno + 1}]} {
+                                       $w_cgrp insert $lno.0 $author_abbr
+                               } else {
+                                       $w_cgrp insert $lno.0 { |}
+                               }
 
                                $w_cgrp tag add g$cmit $lno.0 $lno_e
                                $w_line tag add g$cmit $lno.0 $lno_e
@@ -311,11 +557,24 @@ method _read_blame {fd} {
                                incr blame_lines
                        }
 
-                       set hc $highlight_commit
-                       if {$hc ne {}
-                               && [expr {$order($hc) + 1}] == $order($cmit)} {
-                               _showcommit $this $highlight_line
+                       while {
+                          ![catch {set ncmit $line_commit($lno)}]
+                       && ![catch {set nfile $line_file($lno)}]
+                       && $ncmit eq $cmit
+                       && $nfile eq $file
+                       } {
+                               $w_cgrp delete $lno.0 "$lno.0 lineend"
+
+                               if {$lno == $first_lno} {
+                                       $w_cgrp insert $lno.0 $commit_abbr $commit_type
+                               } elseif {$lno == [expr {$first_lno + 1}]} {
+                                       $w_cgrp insert $lno.0 $author_abbr
+                               } else {
+                                       $w_cgrp insert $lno.0 { |}
+                               }
+                               incr lno
                        }
+
                } elseif {[regexp {^([a-z-]+) (.*)$} $line line key data]} {
                        set header($r_commit,$key) $data
                }
@@ -324,7 +583,9 @@ method _read_blame {fd} {
 
        if {[eof $fd]} {
                close $fd
+               set current_fd {}
                set status {Annotation complete.}
+               destroy $w.status.c
        } else {
                _status $this
        }
@@ -339,6 +600,7 @@ method _status {} {
        set status [format \
                "Loading annotations... %i of %i lines annotated (%2i%%)" \
                $have $total $pdone]
+       $w.status.c coords bar 0 0 $pdone 20
 }
 
 method _click {cur_w pos} {
@@ -347,6 +609,16 @@ method _click {cur_w pos} {
        _showcommit $this $lno
 }
 
+method _load_commit {pos} {
+       set lno [lindex [split [$w_cgrp index $pos] .] 0]
+       if {[catch {set cmit $line_commit($lno)}]} return
+       if {[catch {set file $line_file($lno)  }]} return
+
+       set commit $cmit
+       set path $file
+       _load $this
+}
+
 method _showcommit {lno} {
        global repo_config
        variable active_color
@@ -414,17 +686,30 @@ method _showcommit {lno} {
                        set header($cmit,message) $msg
                }
 
-               $w_cmit insert end "commit $cmit
-Author: $author_name $author_email  $author_time
-Committer: $committer_name $committer_email  $committer_time
-Original File: [escape_path $line_file($lno)]
+               $w_cmit insert end "commit $cmit\n" header_key
+               $w_cmit insert end "Author:\t" header_key
+               $w_cmit insert end "$author_name $author_email" header_val
+               $w_cmit insert end "$author_time\n" header_val
+
+               $w_cmit insert end "Committer:\t" header_key
+               $w_cmit insert end "$committer_name $committer_email" header_val
+               $w_cmit insert end "$committer_time\n" header_val
+
+               if {$line_file($lno) ne $path} {
+                       $w_cmit insert end "Original File:\t" header_key
+                       $w_cmit insert end "[escape_path $line_file($lno)]\n" header_val
+               }
 
-$msg"
+               $w_cmit insert end "\n$msg"
        }
        $w_cmit conf -state disabled
 
        set highlight_line $lno
        set highlight_commit $cmit
+
+       if {$highlight_commit eq $tooltip_commit} {
+               _hide_tooltip $this
+       }
 }
 
 method _copycommit {} {
@@ -439,4 +724,133 @@ method _copycommit {} {
        }
 }
 
+method _show_tooltip {cur_w pos} {
+       set lno [lindex [split [$cur_w index $pos] .] 0]
+       if {[catch {set cmit $line_commit($lno)}]} {
+               _hide_tooltip $this
+               return
+       }
+
+       if {$cmit eq $highlight_commit} {
+               _hide_tooltip $this
+               return
+       }
+
+       if {$cmit eq $tooltip_commit} {
+               _position_tooltip $this
+       } elseif {$tooltip_wm ne {}} {
+               _open_tooltip $this $cur_w
+       } elseif {$tooltip_timer eq {}} {
+               set tooltip_timer [after 1000 [cb _open_tooltip $cur_w]]
+       }
+}
+
+method _open_tooltip {cur_w} {
+       set tooltip_timer {}
+       set pos_x [winfo pointerx $cur_w]
+       set pos_y [winfo pointery $cur_w]
+       if {[winfo containing $pos_x $pos_y] ne $cur_w} {
+               _hide_tooltip $this
+               return
+       }
+
+       set pos @[join [list \
+               [expr {$pos_x - [winfo rootx $cur_w]}] \
+               [expr {$pos_y - [winfo rooty $cur_w]}]] ,]
+       set lno [lindex [split [$cur_w index $pos] .] 0]
+       set cmit $line_commit($lno)
+
+       set author_name {}
+       set author_email {}
+       set author_time {}
+       catch {set author_name $header($cmit,author)}
+       catch {set author_email $header($cmit,author-mail)}
+       catch {set author_time [clock format \
+               $header($cmit,author-time) \
+               -format {%Y-%m-%d %H:%M:%S}
+       ]}
+
+       set committer_name {}
+       set committer_email {}
+       set committer_time {}
+       catch {set committer_name $header($cmit,committer)}
+       catch {set committer_email $header($cmit,committer-mail)}
+       catch {set committer_time [clock format \
+               $header($cmit,committer-time) \
+               -format {%Y-%m-%d %H:%M:%S}
+       ]}
+
+       set summary {}
+       catch {set summary $header($cmit,summary)}
+
+       set tooltip_commit $cmit
+       set tooltip_text "commit $cmit
+$author_name $author_email  $author_time
+$summary"
+
+       set file $line_file($lno)
+       if {$file ne $path} {
+               append tooltip_text "
+
+Original File: $file"
+       }
+
+       if {$tooltip_wm ne "$cur_w.tooltip"} {
+               _hide_tooltip $this
+
+               set tooltip_wm [toplevel $cur_w.tooltip -borderwidth 1]
+               wm overrideredirect $tooltip_wm 1
+               wm transient $tooltip_wm [winfo toplevel $cur_w]
+               pack [label $tooltip_wm.label \
+                       -background lightyellow \
+                       -foreground black \
+                       -textvariable @tooltip_text \
+                       -justify left]
+       }
+       _position_tooltip $this
+}
+
+method _position_tooltip {} {
+       set req_w [winfo reqwidth  $tooltip_wm.label]
+       set req_h [winfo reqheight $tooltip_wm.label]
+       set pos_x [expr {[winfo pointerx .] +  5}]
+       set pos_y [expr {[winfo pointery .] + 10}]
+
+       set g "${req_w}x${req_h}"
+       if {$pos_x >= 0} {append g +}
+       append g $pos_x
+       if {$pos_y >= 0} {append g +}
+       append g $pos_y
+
+       wm geometry $tooltip_wm $g
+       raise $tooltip_wm
+}
+
+method _hide_tooltip {} {
+       if {$tooltip_wm ne {}} {
+               destroy $tooltip_wm
+               set tooltip_wm {}
+               set tooltip_commit {}
+       }
+       if {$tooltip_timer ne {}} {
+               after cancel $tooltip_timer
+               set tooltip_timer {}
+       }
+}
+
+method _resize {new_height} {
+       set diff [expr {$new_height - $old_height}]
+       if {$diff == 0} return
+
+       set my [expr {[winfo height $w.file_pane] - 25}]
+       set o [$w.file_pane sash coord 0]
+       set ox [lindex $o 0]
+       set oy [expr {[lindex $o 1] + $diff}]
+       if {$oy < 0}   {set oy 0}
+       if {$oy > $my} {set oy $my}
+       $w.file_pane sash place 0 $ox $oy
+
+       set old_height $new_height
+}
+
 }