gitk: Implement multiple views

With this, gitk can know about the graphs for multiple sets of files
and directories of interest.  Each set of files/dirs and its graph is
called a "view".  There is always the "All files" view, which is the
complete graph showing all commits.  If files or dirs are specified
on the command line, a "Command line" view is automatically created.
Users can create new views and switch between them, and can delete
any view except the "All files" view.

This required a bit of reengineering.  In particular, some more things
that were arrays have now become lists.  The idrowranges array is still
used while the graph is being laid out, but for rows that have been laid
out we use the rowrangelist list instead.  The cornercrossings and
crossings arrays no longer exist, and instead we compute the crossings
when needed (in assigncolor).

Still to be done: make the back/forward buttons switch views as necessary;
make the updatecommits function work right; preserve the selection if
possible when the new view has to be read in; fix the case when the user
switches away from the current view while we are still reading it in
and laying it out; further optimizations.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/gitk b/gitk
index 90afec92df5c67f0a8fec32569cbdb635c05dbbf..961b582a4d97a47bacf19655f99c7bd512cc35da 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -17,19 +17,38 @@ proc gitdir {} {
 }
 
 proc parse_args {rargs} {
-    global parsed_args
+    global parsed_args cmdline_files
 
+    set parsed_args {}
+    set cmdline_files {}
     if {[catch {
        set parse_args [concat --default HEAD $rargs]
-       set parsed_args [split [eval exec git-rev-parse $parse_args] "\n"]
+       set args [split [eval exec git-rev-parse $parse_args] "\n"]
+       set i 0
+       foreach arg $args {
+           if {![regexp {^[0-9a-f]{40}$} $arg]} {
+               if {$arg eq "--"} {
+                   incr i
+               }
+               set cmdline_files [lrange $args $i end]
+               break
+           }
+           lappend parsed_args $arg
+           incr i
+       }
     }]} {
        # if git-rev-parse failed for some reason...
+       set i [lsearch -exact $rargs "--"]
+       if {$i >= 0} {
+           set cmdline_files [lrange $rargs [expr {$i+1}] end]
+           set rargs [lrange $rargs 0 [expr {$i-1}]]
+       }
        if {$rargs == {}} {
-           set rargs HEAD
+           set parsed_args HEAD
+       } else {
+           set parsed_args $rargs
        }
-       set parsed_args $rargs
     }
-    return $parsed_args
 }
 
 proc start_rev_list {rlargs} {
@@ -65,7 +84,7 @@ proc getcommits {rargs} {
     global phase canv mainfont
 
     set phase getcommits
-    start_rev_list [parse_args $rargs]
+    start_rev_list $rargs
     $canv delete all
     $canv create text 3 3 -anchor nw -text "Reading commits..." \
        -font $mainfont -tags textitems
@@ -141,11 +160,12 @@ proc getcommitlines {commfd}  {
        set id [lindex $ids 0]
        if {$listed} {
            set olds [lrange $ids 1 end]
-           if {[llength $olds] > 1} {
-               set olds [lsort -unique $olds]
-           }
+           set i 0
            foreach p $olds {
-               lappend children($p) $id
+               if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
+                   lappend children($p) $id
+               }
+               incr i
            }
        } else {
            set olds {}
@@ -196,18 +216,18 @@ proc readcommit {id} {
     parsecommit $id $contents 0
 }
 
-proc updatecommits {rargs} {
+proc updatecommits {} {
+    global parsed_args
+
+    unselectline
     stopfindproc
-    foreach v {colormap selectedline matchinglines treediffs
-       mergefilelist currentid rowtextx commitrow
-       rowidlist rowoffsets idrowranges idrangedrawn iddrawn
-       linesegends crossings cornercrossings} {
+    foreach v {matchinglines treediffs currentid} {
        global $v
        catch {unset $v}
     }
-    allcanvs delete all
+    clear_display
     readrefs
-    getcommits $rargs
+    getcommits $parsed_args
 }
 
 proc parsecommit {id contents listed} {
@@ -344,12 +364,18 @@ proc makewindow {rargs} {
     menu .bar
     .bar add cascade -label "File" -menu .bar.file
     menu .bar.file
-    .bar.file add command -label "Update" -command [list updatecommits $rargs]
+    .bar.file add command -label "Update" -command updatecommits
     .bar.file add command -label "Reread references" -command rereadrefs
     .bar.file add command -label "Quit" -command doquit
     menu .bar.edit
     .bar add cascade -label "Edit" -menu .bar.edit
     .bar.edit add command -label "Preferences" -command doprefs
+    menu .bar.view
+    .bar add cascade -label "View" -menu .bar.view
+    .bar.view add command -label "New view..." -command newview
+    .bar.view add command -label "Delete view" -command delview -state disabled
+    .bar.view add separator
+    .bar.view add command -label "All files" -command {showview 0}
     menu .bar.help
     .bar add cascade -label "Help" -menu .bar.help
     .bar.help add command -label "About gitk" -command about
@@ -718,6 +744,169 @@ Use and redistribute under the terms of the GNU General Public License} \
     pack $w.ok -side bottom
 }
 
+proc newview {} {
+    global newviewname nextviewnum newviewtop
+
+    set top .gitkview
+    if {[winfo exists $top]} {
+       raise $top
+       return
+    }
+    set newviewtop $top
+    toplevel $top
+    wm title $top "Gitk view definition"
+    label $top.nl -text "Name"
+    entry $top.name -width 20 -textvariable newviewname
+    set newviewname "View $nextviewnum"
+    grid $top.nl $top.name -sticky w
+    label $top.l -text "Files and directories to include:"
+    grid $top.l - -sticky w -pady 10
+    text $top.t -width 30 -height 10
+    grid $top.t - -sticky w
+    frame $top.buts
+    button $top.buts.ok -text "OK" -command newviewok
+    button $top.buts.can -text "Cancel" -command newviewcan
+    grid $top.buts.ok $top.buts.can
+    grid columnconfigure $top.buts 0 -weight 1 -uniform a
+    grid columnconfigure $top.buts 1 -weight 1 -uniform a
+    grid $top.buts - -pady 10 -sticky ew
+    focus $top.t
+}
+
+proc newviewok {} {
+    global newviewtop nextviewnum
+    global viewname viewfiles
+
+    set n $nextviewnum
+    incr nextviewnum
+    set viewname($n) [$newviewtop.name get]
+    set files {}
+    foreach f [split [$newviewtop.t get 0.0 end] "\n"] {
+       set ft [string trim $f]
+       if {$ft ne {}} {
+           lappend files $ft
+       }
+    }
+    set viewfiles($n) $files
+    catch {destroy $newviewtop}
+    unset newviewtop
+    .bar.view add command -label $viewname($n) -command [list showview $n]
+    after idle showview $n
+}
+
+proc newviewcan {} {
+    global newviewtop
+
+    catch {destroy $newviewtop}
+    unset newviewtop
+}
+
+proc delview {} {
+    global curview viewdata
+
+    if {$curview == 0} return
+    set nmenu [.bar.view index end]
+    set targetcmd [list showview $curview]
+    for {set i 5} {$i <= $nmenu} {incr i} {
+       if {[.bar.view entrycget $i -command] eq $targetcmd} {
+           .bar.view delete $i
+           break
+       }
+    }
+    set viewdata($curview) {}
+    showview 0
+}
+
+proc saveview {} {
+    global curview viewdata
+    global displayorder parentlist childlist rowidlist rowoffsets
+    global rowrangelist commitlisted
+
+}
+
+proc showview {n} {
+    global curview viewdata viewfiles
+    global displayorder parentlist childlist rowidlist rowoffsets
+    global colormap rowtextx commitrow
+    global numcommits rowrangelist commitlisted idrowranges
+    global selectedline currentid canv canvy0
+    global matchinglines treediffs
+    global parsed_args
+
+    if {$n == $curview} return
+    set selid {}
+    if {[info exists selectedline]} {
+       set selid $currentid
+       set y [yc $selectedline]
+       set ymax [lindex [$canv cget -scrollregion] 3]
+       set span [$canv yview]
+       set ytop [expr {[lindex $span 0] * $ymax}]
+       set ybot [expr {[lindex $span 1] * $ymax}]
+       if {$ytop < $y && $y < $ybot} {
+           set yscreen [expr {$y - $ytop}]
+       } else {
+           set yscreen [expr {($ybot - $ytop) / 2}]
+       }
+    }
+    unselectline
+    stopfindproc
+    if {![info exists viewdata($curview)]} {
+       set viewdata($curview) \
+           [list $displayorder $parentlist $childlist $rowidlist \
+                $rowoffsets $rowrangelist $commitlisted]
+    }
+    catch {unset matchinglines}
+    catch {unset treediffs}
+    clear_display
+
+    set curview $n
+    .bar.view entryconf 2 -state [expr {$n == 0? "disabled": "normal"}]
+
+    if {![info exists viewdata($n)]} {
+       set args $parsed_args
+       if {$viewfiles($n) ne {}} {
+           set args [concat $args "--" $viewfiles($n)]
+       }
+       getcommits $args 
+       return
+    }
+
+    set displayorder [lindex $viewdata($n) 0]
+    set parentlist [lindex $viewdata($n) 1]
+    set childlist [lindex $viewdata($n) 2]
+    set rowidlist [lindex $viewdata($n) 3]
+    set rowoffsets [lindex $viewdata($n) 4]
+    set rowrangelist [lindex $viewdata($n) 5]
+    set commitlisted [lindex $viewdata($n) 6]
+    set numcommits [llength $displayorder]
+    catch {unset colormap}
+    catch {unset rowtextx}
+    catch {unset commitrow}
+    catch {unset idrowranges}
+    set curview $n
+    set row 0
+    foreach id $displayorder {
+       set commitrow($id) $row
+       incr row
+    }
+    setcanvscroll
+    set yf 0
+    set row 0
+    if {$selid ne {} && [info exists commitrow($selid)]} {
+       set row $commitrow($selid)
+       # try to get the selected row in the same position on the screen
+       set ymax [lindex [$canv cget -scrollregion] 3]
+       set ytop [expr {[yc $row] - $yscreen}]
+       if {$ytop < 0} {
+           set ytop 0
+       }
+       set yf [expr {$ytop * 1.0 / $ymax}]
+    }
+    allcanvs yview moveto $yf
+    drawvisible
+    selectline $row 0
+}
+
 proc shortids {ids} {
     set res {}
     foreach id $ids {
@@ -834,10 +1023,12 @@ proc makeuparrow {oid x y z} {
 proc initlayout {} {
     global rowidlist rowoffsets displayorder commitlisted
     global rowlaidout rowoptim
-    global idinlist rowchk
+    global idinlist rowchk rowrangelist idrowranges
     global commitidx numcommits canvxmax canv
     global nextcolor
     global parentlist childlist children
+    global colormap rowtextx commitrow
+    global linesegends
 
     set commitidx 0
     set numcommits 0
@@ -845,6 +1036,7 @@ proc initlayout {} {
     set commitlisted {}
     set parentlist {}
     set childlist {}
+    set rowrangelist {{}}
     catch {unset children}
     set nextcolor 0
     set rowidlist {{}}
@@ -854,6 +1046,11 @@ proc initlayout {} {
     set rowlaidout 0
     set rowoptim 0
     set canvxmax [$canv cget -width]
+    catch {unset colormap}
+    catch {unset rowtextx}
+    catch {unset commitrow}
+    catch {unset idrowranges}
+    catch {unset linesegends}
 }
 
 proc setcanvscroll {} {
@@ -892,7 +1089,6 @@ proc layoutmore {} {
     set rowlaidout [layoutrows $row $commitidx 0]
     set orow [expr {$rowlaidout - $uparrowlen - 1}]
     if {$orow > $rowoptim} {
-       checkcrossings $rowoptim $orow
        optimize_rows $rowoptim 0 $orow
        set rowoptim $orow
     }
@@ -947,7 +1143,7 @@ proc layoutrows {row endrow last} {
     global childlist parentlist
     global idrowranges linesegends
     global commitidx
-    global idinlist rowchk
+    global idinlist rowchk rowrangelist
 
     set idlist [lindex $rowidlist $row]
     set offs [lindex $rowoffsets $row]
@@ -1008,6 +1204,7 @@ proc layoutrows {row endrow last} {
        }
        if {[info exists idrowranges($id)]} {
            lappend idrowranges($id) $row
+           lappend rowrangelist $idrowranges($id)
        }
        incr row
        set offs [ntimes [llength $idlist] 0]
@@ -1068,7 +1265,7 @@ proc addextraid {id row} {
 
 proc layouttail {} {
     global rowidlist rowoffsets idinlist commitidx
-    global idrowranges
+    global idrowranges rowrangelist
 
     set row $commitidx
     set idlist [lindex $rowidlist $row]
@@ -1078,6 +1275,7 @@ proc layouttail {} {
        addextraid $id $row
        unset idinlist($id)
        lappend idrowranges($id) $row
+       lappend rowrangelist $idrowranges($id)
        incr row
        set offs [ntimes $col 0]
        set idlist [lreplace $idlist $col $col]
@@ -1091,6 +1289,7 @@ proc layouttail {} {
        lset rowoffsets $row 0
        makeuparrow $id 0 $row 0
        lappend idrowranges($id) $row
+       lappend rowrangelist $idrowranges($id)
        incr row
        lappend rowidlist {}
        lappend rowoffsets {}
@@ -1107,7 +1306,7 @@ proc insert_pad {row col npad} {
 }
 
 proc optimize_rows {row col endrow} {
-    global rowidlist rowoffsets idrowranges linesegends displayorder
+    global rowidlist rowoffsets idrowranges displayorder
 
     for {} {$row < $endrow} {incr row} {
        set idlist [lindex $rowidlist $row]
@@ -1240,13 +1439,33 @@ proc linewidth {id} {
     return $wid
 }
 
+proc rowranges {id} {
+    global idrowranges commitrow numcommits rowrangelist
+
+    set ranges {}
+    if {[info exists commitrow($id)] && $commitrow($id) < $numcommits} {
+       set ranges [lindex $rowrangelist $commitrow($id)]
+    } elseif {[info exists idrowranges($id)]} {
+       set ranges $idrowranges($id)
+    }
+    return $ranges
+}
+
 proc drawlineseg {id i} {
-    global rowoffsets rowidlist idrowranges
+    global rowoffsets rowidlist
     global displayorder
     global canv colormap linespc
+    global numcommits commitrow
 
-    set startrow [lindex $idrowranges($id) [expr {2 * $i}]]
-    set row [lindex $idrowranges($id) [expr {2 * $i + 1}]]
+    set ranges [rowranges $id]
+    set downarrow 1
+    if {[info exists commitrow($id)] && $commitrow($id) < $numcommits} {
+       set downarrow [expr {$i < [llength $ranges] / 2 - 1}]
+    } else {
+       set downarrow 1
+    }
+    set startrow [lindex $ranges [expr {2 * $i}]]
+    set row [lindex $ranges [expr {2 * $i + 1}]]
     if {$startrow == $row} return
     assigncolor $id
     set coords {}
@@ -1290,8 +1509,7 @@ proc drawlineseg {id i} {
        }
     }
     if {[llength $coords] < 4} return
-    set last [expr {[llength $idrowranges($id)] / 2 - 1}]
-    if {$i < $last} {
+    if {$downarrow} {
        # This line has an arrow at the lower end: check if the arrow is
        # on a diagonal segment, and if so, work around the Tk 8.4
        # refusal to draw arrows on diagonal lines.
@@ -1311,7 +1529,7 @@ proc drawlineseg {id i} {
            }
        }
     }
-    set arrow [expr {2 * ($i > 0) + ($i < $last)}]
+    set arrow [expr {2 * ($i > 0) + $downarrow}]
     set arrow [lindex {none first last both} $arrow]
     set t [$canv create line $coords -width [linewidth $id] \
               -fill $colormap($id) -tags lines.$id -arrow $arrow]
@@ -1320,7 +1538,7 @@ proc drawlineseg {id i} {
 }
 
 proc drawparentlinks {id row col olds} {
-    global rowidlist canv colormap idrowranges
+    global rowidlist canv colormap
 
     set row2 [expr {$row + 1}]
     set x [xc $row $col]
@@ -1339,9 +1557,9 @@ proc drawparentlinks {id row col olds} {
        if {$x2 > $rmx} {
            set rmx $x2
        }
-       if {[info exists idrowranges($p)] &&
-           $row2 == [lindex $idrowranges($p) 0] &&
-           $row2 < [lindex $idrowranges($p) 1]} {
+       set ranges [rowranges $p]
+       if {$ranges ne {} && $row2 == [lindex $ranges 0]
+           && $row2 < [lindex $ranges 1]} {
            # drawlineseg will do this one for us
            continue
        }
@@ -1364,11 +1582,11 @@ proc drawparentlinks {id row col olds} {
 
 proc drawlines {id} {
     global colormap canv
-    global idrowranges idrangedrawn
+    global idrangedrawn
     global childlist iddrawn commitrow rowidlist
 
     $canv delete lines.$id
-    set nr [expr {[llength $idrowranges($id)] / 2}]
+    set nr [expr {[llength [rowranges $id]] / 2}]
     for {set i 0} {$i < $nr} {incr i} {
        if {[info exists idrangedrawn($id,$i)]} {
            drawlineseg $id $i
@@ -1431,14 +1649,13 @@ proc drawcmittext {id row col rmx} {
 
 proc drawcmitrow {row} {
     global displayorder rowidlist
-    global idrowranges idrangedrawn iddrawn
+    global idrangedrawn iddrawn
     global commitinfo commitlisted parentlist numcommits
 
     if {$row >= $numcommits} return
     foreach id [lindex $rowidlist $row] {
-       if {![info exists idrowranges($id)]} continue
        set i -1
-       foreach {s e} $idrowranges($id) {
+       foreach {s e} [rowranges $id] {
            incr i
            if {$row < $s} continue
            if {$e eq {}} break
@@ -1507,10 +1724,50 @@ proc clear_display {} {
     catch {unset idrangedrawn}
 }
 
+proc findcrossings {id} {
+    global rowidlist parentlist numcommits rowoffsets displayorder
+
+    set cross {}
+    set ccross {}
+    foreach {s e} [rowranges $id] {
+       if {$e >= $numcommits} {
+           set e [expr {$numcommits - 1}]
+           if {$e < $s} continue
+       }
+       set x [lsearch -exact [lindex $rowidlist $e] $id]
+       if {$x < 0} {
+           puts "findcrossings: oops, no [shortids $id] in row $e"
+           continue
+       }
+       for {set row $e} {[incr row -1] >= $s} {} {
+           set olds [lindex $parentlist $row]
+           set kid [lindex $displayorder $row]
+           set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
+           if {$kidx < 0} continue
+           set nextrow [lindex $rowidlist [expr {$row + 1}]]
+           foreach p $olds {
+               set px [lsearch -exact $nextrow $p]
+               if {$px < 0} continue
+               if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
+                   if {[lsearch -exact $ccross $p] >= 0} continue
+                   if {$x == $px + ($kidx < $px? -1: 1)} {
+                       lappend ccross $p
+                   } elseif {[lsearch -exact $cross $p] < 0} {
+                       lappend cross $p
+                   }
+               }
+           }
+           set inc [lindex $rowoffsets $row $x]
+           if {$inc eq {}} break
+           incr x $inc
+       }
+    }
+    return [concat $ccross {{}} $cross]
+}
+
 proc assigncolor {id} {
     global colormap colors nextcolor
     global commitrow parentlist children childlist
-    global cornercrossings crossings
 
     if {[info exists colormap($id)]} return
     set ncolors [llength $colors]
@@ -1530,32 +1787,22 @@ proc assigncolor {id} {
        }
     }
     set badcolors {}
-    if {[info exists cornercrossings($id)]} {
-       foreach x $cornercrossings($id) {
-           if {[info exists colormap($x)]
-               && [lsearch -exact $badcolors $colormap($x)] < 0} {
-               lappend badcolors $colormap($x)
-           }
+    set origbad {}
+    foreach x [findcrossings $id] {
+       if {$x eq {}} {
+           # delimiter between corner crossings and other crossings
+           if {[llength $badcolors] >= $ncolors - 1} break
+           set origbad $badcolors
        }
-       if {[llength $badcolors] >= $ncolors} {
-           set badcolors {}
+       if {[info exists colormap($x)]
+           && [lsearch -exact $badcolors $colormap($x)] < 0} {
+           lappend badcolors $colormap($x)
        }
     }
-    set origbad $badcolors
-    if {[llength $badcolors] < $ncolors - 1} {
-       if {[info exists crossings($id)]} {
-           foreach x $crossings($id) {
-               if {[info exists colormap($x)]
-                   && [lsearch -exact $badcolors $colormap($x)] < 0} {
-                   lappend badcolors $colormap($x)
-               }
-           }
-           if {[llength $badcolors] >= $ncolors} {
-               set badcolors $origbad
-           }
-       }
-       set origbad $badcolors
+    if {[llength $badcolors] >= $ncolors} {
+       set badcolors $origbad
     }
+    set origbad $badcolors
     if {[llength $badcolors] < $ncolors - 1} {
        foreach child $kids {
            if {[info exists colormap($child)]
@@ -1659,55 +1906,6 @@ proc drawtags {id x xt y1} {
     return $xt
 }
 
-proc checkcrossings {row endrow} {
-    global displayorder parentlist rowidlist
-
-    for {} {$row < $endrow} {incr row} {
-       set id [lindex $displayorder $row]
-       set i [lsearch -exact [lindex $rowidlist $row] $id]
-       if {$i < 0} continue
-       set idlist [lindex $rowidlist [expr {$row+1}]]
-       foreach p [lindex $parentlist $row] {
-           set j [lsearch -exact $idlist $p]
-           if {$j > 0} {
-               if {$j < $i - 1} {
-                   notecrossings $row $p $j $i [expr {$j+1}]
-               } elseif {$j > $i + 1} {
-                   notecrossings $row $p $i $j [expr {$j-1}]
-               }
-           }
-       }
-    }
-}
-
-proc notecrossings {row id lo hi corner} {
-    global rowidlist crossings cornercrossings
-
-    for {set i $lo} {[incr i] < $hi} {} {
-       set p [lindex [lindex $rowidlist $row] $i]
-       if {$p == {}} continue
-       if {$i == $corner} {
-           if {![info exists cornercrossings($id)]
-               || [lsearch -exact $cornercrossings($id) $p] < 0} {
-               lappend cornercrossings($id) $p
-           }
-           if {![info exists cornercrossings($p)]
-               || [lsearch -exact $cornercrossings($p) $id] < 0} {
-               lappend cornercrossings($p) $id
-           }
-       } else {
-           if {![info exists crossings($id)]
-               || [lsearch -exact $crossings($id) $p] < 0} {
-               lappend crossings($id) $p
-           }
-           if {![info exists crossings($p)]
-               || [lsearch -exact $crossings($p) $id] < 0} {
-               lappend crossings($p) $id
-           }
-       }
-    }
-}
-
 proc xcoord {i level ln} {
     global canvx0 xspc1 xspc2
 
@@ -1763,7 +1961,7 @@ proc drawrest {} {
     showstuff $commitidx
 
     set drawmsecs [expr {[clock clicks -milliseconds] - $startmsecs}]
-    puts "overall $drawmsecs ms for $numcommits commits"
+    #puts "overall $drawmsecs ms for $numcommits commits"
 }
 
 proc findmatches {f} {
@@ -2433,9 +2631,10 @@ proc selnextline {dir} {
 }
 
 proc unselectline {} {
-    global selectedline
+    global selectedline currentid
 
     catch {unset selectedline}
+    catch {unset currentid}
     allcanvs delete secsel
 }
 
@@ -2948,12 +3147,13 @@ proc linehover {} {
 }
 
 proc clickisonarrow {id y} {
-    global lthickness idrowranges
+    global lthickness
 
+    set ranges [rowranges $id]
     set thresh [expr {2 * $lthickness + 6}]
-    set n [expr {[llength $idrowranges($id)] - 1}]
+    set n [expr {[llength $ranges] - 1}]
     for {set i 1} {$i < $n} {incr i} {
-       set row [lindex $idrowranges($id) $i]
+       set row [lindex $ranges $i]
        if {abs([yc $row] - $y) < $thresh} {
            return $i
        }
@@ -2962,11 +3162,11 @@ proc clickisonarrow {id y} {
 }
 
 proc arrowjump {id n y} {
-    global idrowranges canv
+    global canv
 
     # 1 <-> 2, 3 <-> 4, etc...
     set n [expr {(($n - 1) ^ 1) + 1}]
-    set row [lindex $idrowranges($id) $n]
+    set row [lindex [rowranges $id] $n]
     set yt [yc $row]
     set ymax [lindex [$canv cget -scrollregion] 3]
     if {$ymax eq {} || $ymax <= 0} return
@@ -3819,10 +4019,26 @@ set historyindex 0
 
 set optim_delay 16
 
+set nextviewnum 1
+set curview 0
+set viewfiles(0) {}
+
 set stopped 0
 set stuffsaved 0
 set patchnum 0
 setcoords
 makewindow $revtreeargs
 readrefs
-getcommits $revtreeargs
+parse_args $revtreeargs
+set args $parsed_args
+if {$cmdline_files ne {}} {
+    # create a view for the files/dirs specified on the command line
+    set curview 1
+    set nextviewnum 2
+    set viewname(1) "Command line"
+    set viewfiles(1) $cmdline_files
+    .bar.view add command -label $viewname(1) -command {showview 1}
+    .bar.view entryconf 2 -state normal
+    set args [concat $args "--" $cmdline_files]
+}
+getcommits $args