# git-gui status bar mega-widget
# Copyright (C) 2007 Shawn Pearce

class status_bar {

field w         ; # our own window path
field w_l       ; # text widget we draw messages into
field w_c       ; # canvas we draw a progress bar into
field status  {}; # single line of text we show
field prefix  {}; # text we format into status
field units   {}; # unit of progress
field meter   {}; # current core git progress meter (if active)

constructor new {path} {
        set w $path
        set w_l $w.l
        set w_c $w.c

        frame $w \
                -borderwidth 1 \
                -relief sunken
        label $w_l \
                -textvariable @status \
                -anchor w \
                -justify left
        pack $w_l -side left

        bind $w <Destroy> [cb _delete %W]
        return $this
}

method start {msg uds} {
        if {[winfo exists $w_c]} {
                $w_c coords bar 0 0 0 20
        } else {
                canvas $w_c \
                        -width 100 \
                        -height [expr {int([winfo reqheight $w_l] * 0.6)}] \
                        -borderwidth 1 \
                        -relief groove \
                        -highlightt 0
                $w_c create rectangle 0 0 0 20 -tags bar -fill navy
                pack $w_c -side right
        }

        set status $msg
        set prefix $msg
        set units  $uds
        set meter  {}
}

method update {have total} {
        set pdone 0
        if {$total > 0} {
                set pdone [expr {100 * $have / $total}]
        }

        set status [format "%s ... %i of %i %s (%2i%%)" \
                $prefix $have $total $units $pdone]
        $w_c coords bar 0 0 $pdone 20
}

method update_meter {buf} {
        append meter $buf
        set r [string last "\r" $meter]
        if {$r == -1} {
                return
        }

        set prior [string range $meter 0 $r]
        set meter [string range $meter [expr {$r + 1}] end]
        set p "\\((\\d+)/(\\d+)\\)"
        if {[regexp ":\\s*\\d+% $p\(?:, done.\\s*\n|\\s*\r)\$" $prior _j a b]} {
                update $this $a $b
        } elseif {[regexp "$p\\s+done\r\$" $prior _j a b]} {
                update $this $a $b
        }
}

method stop {{msg {}}} {
        destroy $w_c
        if {$msg ne {}} {
                set status $msg
        }
}

method show {msg {test {}}} {
        if {$test eq {} || $status eq $test} {
                set status $msg
        }
}

method _delete {current} {
        if {$current eq $w} {
                delete_this
        }
}

}