git-gui: Correctly handle CR vs. LF within the console of fetch.

Because the remote end is likely to send us progress meters by
resetting each line with a CR (and no LF) we should display those
meters by replacing the last line of text with the next line,
just like a normal xterm would do.

This makes the output of fetch look about the same as if we ran it
from within an xterm.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/git-gui b/git-gui
index 0bbb006..2645cd5 100755 (executable)
--- a/git-gui
+++ b/git-gui
@@ -1002,9 +1002,11 @@ proc hook_failed_popup {hook msg} {
 set next_console_id 0
 
 proc new_console {short_title long_title} {
-       global next_console_id gitdir appname mainfont difffont
+       global next_console_id console_cr
+       global gitdir appname mainfont difffont
 
        set w .console[incr next_console_id]
+       set console_cr($w) 1.0
        toplevel $w
        frame $w.m
        label $w.m.l1 -text "$long_title:" \
@@ -1024,7 +1026,7 @@ proc new_console {short_title long_title} {
        pack $w.m.t -side left -fill both -expand 1
        pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10
 
-       button $w.ok -text {OK} \
+       button $w.ok -text {Running...} \
                -width 15 \
                -font $mainfont \
                -state disabled \
@@ -1053,22 +1055,44 @@ proc console_exec {w cmd} {
        set cmd [concat | $cmd |& cat]
 
        set fd_f [open $cmd r]
-       fconfigure $fd_f -blocking 0 -translation auto
+       fconfigure $fd_f -blocking 0 -translation binary
        fileevent $fd_f readable [list console_read $w $fd_f]
 }
 
 proc console_read {w fd} {
+       global console_cr
+
        $w.m.t conf -state normal
-       while {[gets $fd line] >= 0} {
-               $w.m.t insert end $line
-               $w.m.t insert end "\n"
+       set buf [read $fd]
+       set c 0
+       set n [string length $buf]
+       while {$c < $n} {
+               set cr [string first "\r" $buf $c]
+               set lf [string first "\n" $buf $c]
+               if {$cr < 0} {set cr [expr $n + 1]}
+               if {$lf < 0} {set lf [expr $n + 1]}
+
+               if {$lf < $cr} {
+                       $w.m.t insert end [string range $buf $c $lf]
+                       set console_cr($w) [$w.m.t index {end -1c}]
+                       set c $lf
+                       incr c
+               } else {
+                       $w.m.t delete $console_cr($w) end
+                       $w.m.t insert end "\n"
+                       $w.m.t insert end [string range $buf $c $cr]
+                       set c $cr
+                       incr c
+               }
        }
        $w.m.t conf -state disabled
        $w.m.t see end
 
        if {[eof $fd]} {
                close $fd
+               $w.ok conf -text Close
                $w.ok conf -state normal
+               array unset console_cr $w
        }
 }