Merge https://github.com/prati0100/git-gui

* https://github.com/prati0100/git-gui:
  git-gui - use mkshortcut on Cygwin
  git-gui - use cygstart to browse on Cygwin
  git-gui - remove obsolete Cygwin specific code
  git gui Makefile - remove Cygwin modifications
  Makefiles: change search through $(MAKEFLAGS) for GNU make 4.4
  Work around Tcl's default `PATH` lookup
  Move the `_which` function (almost) to the top
  Move is_<platform> functions to the beginning
  is_Cygwin: avoid `exec`ing anything
  windows: ignore empty `PATH` elements
  git-gui: Fix a typo in README

git-gui/lib/choose_repository.tcl

@@ -174,9 +174,6 @@ constructor pick {} {
 			-foreground blue \
 			-underline 1
 		set home $::env(HOME)
-		if {[is_Cygwin]} {
-			set home [exec cygpath --windows --absolute $home]
-		}
 		set home "[file normalize $home]/"
 		set hlen [string length $home]
 		foreach p $sorted_recent {
@@ -374,18 +371,6 @@ proc _objdir {path} {
 		return $objdir
 	}
 
-	if {[is_Cygwin]} {
-		set objdir [file join $path .git objects.lnk]
-		if {[file isfile $objdir]} {
-			return [win32_read_lnk $objdir]
-		}
-
-		set objdir [file join $path objects.lnk]
-		if {[file isfile $objdir]} {
-			return [win32_read_lnk $objdir]
-		}
-	}
-
 	return {}
 }
 
@@ -623,12 +608,6 @@ method _do_clone2 {} {
 	}
 
 	set giturl $origin_url
-	if {[is_Cygwin] && [file isdirectory $giturl]} {
-		set giturl [exec cygpath --unix --absolute $giturl]
-		if {$clone_type eq {shared}} {
-			set objdir [exec cygpath --unix --absolute $objdir]
-		}
-	}
 
 	if {[file exists $local_path]} {
 		error_popup [mc "Location %s already exists." $local_path]
@@ -668,11 +647,7 @@ method _do_clone2 {} {
 				fconfigure $f_cp -translation binary -encoding binary
 				cd $objdir
 				while {[gets $f_in line] >= 0} {
-					if {[is_Cygwin]} {
-						puts $f_cp [exec cygpath --unix --absolute $line]
-					} else {
-						puts $f_cp [file normalize $line]
-					}
+					puts $f_cp [file normalize $line]
 				}
 				close $f_in
 				close $f_cp

git-gui/lib/shortcut.tcl

@@ -27,13 +27,10 @@ proc do_windows_shortcut {} {
 }
 
 proc do_cygwin_shortcut {} {
-	global argv0 _gitworktree
+	global argv0 _gitworktree oguilib
 
 	if {[catch {
 		set desktop [exec cygpath \
-			--windows \
-			--absolute \
-			--long-name \
 			--desktop]
 		}]} {
 			set desktop .
@@ -48,19 +45,19 @@ proc do_cygwin_shortcut {} {
 			set fn ${fn}.lnk
 		}
 		if {[catch {
-				set sh [exec cygpath \
-					--windows \
-					--absolute \
-					/bin/sh.exe]
-				set me [exec cygpath \
-					--unix \
-					--absolute \
-					$argv0]
-				win32_create_lnk $fn [list \
-					$sh -c \
-					"CHERE_INVOKING=1 source /etc/profile;[sq $me] &" \
-					] \
-					[file normalize $_gitworktree]
+				set repodir [file normalize $_gitworktree]
+				set shargs {-c \
+					"CHERE_INVOKING=1 \
+					source /etc/profile; \
+					git gui"}
+				exec /bin/mkshortcut.exe \
+					--arguments $shargs \
+					--desc "git-gui on $repodir" \
+					--icon $oguilib/git-gui.ico \
+					--name $fn \
+					--show min \
+					--workingdir $repodir \
+					/bin/sh.exe
 			} err]} {
 			error_popup [strcat [mc "Cannot write shortcut:"] "\n\n$err"]
 		}