git-gui: unicode file name support on windows

Assumes file names in git tree objects are UTF-8 encoded.

On most unix systems, the system encoding (and thus the TCL system
encoding) will be UTF-8, so file names will be displayed correctly.

On Windows, it is impossible to set the system encoding to UTF-8. Changing
the TCL system encoding (via 'encoding system ...', e.g. in the startup
code) is explicitly discouraged by the TCL docs.

Change git-gui functions dealing with file names to always convert
from and to UTF-8.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

Author: kblees

git-gui.sh

@@ -556,6 +556,9 @@ proc git {args} {
 
 	_trace_exec [concat $opt $cmdp $args]
 	set result [eval exec $opt $cmdp $args]
+	if {[encoding system] != "utf-8"} {
+		set result [encoding convertfrom utf-8 [encoding convertto $result]]
+	}
 	if {$::_trace} {
 		puts stderr "< $result"
 	}
@@ -1111,7 +1114,7 @@ git-version proc _parse_config {arr_name args} {
 				[list git_read config] \
 				$args \
 				[list --null --list]]
-			fconfigure $fd_rc -translation binary
+			fconfigure $fd_rc -translation binary -encoding utf-8
 			set buf [read $fd_rc]
 			close $fd_rc
 		}
@@ -1691,7 +1694,7 @@ proc read_diff_index {fd after} {
 		set i [split [string range $buf_rdi $c [expr {$z1 - 2}]] { }]
 		set p [string range $buf_rdi $z1 [expr {$z2 - 1}]]
 		merge_state \
-			[encoding convertfrom $p] \
+			[encoding convertfrom utf-8 $p] \
 			[lindex $i 4]? \
 			[list [lindex $i 0] [lindex $i 2]] \
 			[list]
@@ -1724,7 +1727,7 @@ proc read_diff_files {fd after} {
 		set i [split [string range $buf_rdf $c [expr {$z1 - 2}]] { }]
 		set p [string range $buf_rdf $z1 [expr {$z2 - 1}]]
 		merge_state \
-			[encoding convertfrom $p] \
+			[encoding convertfrom utf-8 $p] \
 			?[lindex $i 4] \
 			[list] \
 			[list [lindex $i 0] [lindex $i 2]]
@@ -1747,7 +1750,7 @@ proc read_ls_others {fd after} {
 	set pck [split $buf_rlo "\0"]
 	set buf_rlo [lindex $pck end]
 	foreach p [lrange $pck 0 end-1] {
-		set p [encoding convertfrom $p]
+		set p [encoding convertfrom utf-8 $p]
 		if {[string index $p end] eq {/}} {
 			set p [string range $p 0 end-1]
 		}

lib/browser.tcl

@@ -197,7 +197,7 @@ method _ls {tree_id {name {}}} {
 	$w conf -state disabled
 
 	set fd [git_read ls-tree -z $tree_id]
-	fconfigure $fd -blocking 0 -translation binary -encoding binary
+	fconfigure $fd -blocking 0 -translation binary -encoding utf-8
 	fileevent $fd readable [cb _read $fd]
 }
 

lib/index.tcl

@@ -115,7 +115,7 @@ proc write_update_indexinfo {fd pathList totalCnt batch after} {
 		set info [lindex $s 2]
 		if {$info eq {}} continue
 
-		puts -nonewline $fd "$info\t[encoding convertto $path]\0"
+		puts -nonewline $fd "$info\t[encoding convertto utf-8 $path]\0"
 		display_file $path $new
 	}
 
@@ -186,7 +186,7 @@ proc write_update_index {fd pathList totalCnt batch after} {
 		?M {set new M_}
 		?? {continue}
 		}
-		puts -nonewline $fd "[encoding convertto $path]\0"
+		puts -nonewline $fd "[encoding convertto utf-8 $path]\0"
 		display_file $path $new
 	}
 
@@ -247,7 +247,7 @@ proc write_checkout_index {fd pathList totalCnt batch after} {
 		?M -
 		?T -
 		?D {
-			puts -nonewline $fd "[encoding convertto $path]\0"
+			puts -nonewline $fd "[encoding convertto utf-8 $path]\0"
 			display_file $path ?_
 		}
 		}