git

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#!/bin/sh
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# Tcl ignores the next line -*- tcl -*- \
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exec wish "$0" -- "$@"
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# This is a trivial implementation of an SSH_ASKPASS handler.
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# Git-gui uses this script if none are already configured.
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package require Tk
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set answer {}
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set yesno  0
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set rc     255
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if {$argc < 1} {
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	set prompt "Enter your OpenSSH passphrase:"
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} else {
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	set prompt [join $argv " "]
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	if {[regexp -nocase {\(yes\/no\)\?\s*$} $prompt]} {
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		set yesno 1
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	}
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}
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message .m -text $prompt -justify center -aspect 4000
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pack .m -side top -fill x -padx 20 -pady 20 -expand 1
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entry .e -textvariable answer -width 50
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pack .e -side top -fill x -padx 10 -pady 10
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proc on_show_input_changed {args} {
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	global show_input
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	if {$show_input} {
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		.e configure -show ""
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	} else {
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		.e configure -show "*"
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	}
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}
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trace add variable show_input write "on_show_input_changed"
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set show_input 0
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if {!$yesno} {
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	checkbutton .cb_show -text "Show input" -variable show_input
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	pack .cb_show -side top -anchor nw
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}
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frame .b
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button .b.ok     -text OK     -command finish
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button .b.cancel -text Cancel -command cancel
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pack .b.ok -side left -expand 1
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pack .b.cancel -side right -expand 1
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pack .b -side bottom -fill x -padx 10 -pady 10
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bind . <Visibility> {focus -force .e}
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bind . <Key-Return> [list .b.ok invoke]
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bind . <Key-Escape> [list .b.cancel invoke]
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bind . <Destroy>    {set rc $rc}
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proc cancel {} {
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	set ::rc 255
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}
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proc finish {} {
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	if {$::yesno} {
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		if {$::answer ne "yes" && $::answer ne "no"} {
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			tk_messageBox -icon error -title "Error" -type ok \
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				-message "Only 'yes' or 'no' input allowed."
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			return
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		}
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	}
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	# On Windows, force the encoding to UTF-8: it is what `git.exe` expects
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	if {$::tcl_platform(platform) eq {windows}} {
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		set ::answer [encoding convertto utf-8 $::answer]
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	}
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	puts $::answer
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	set ::rc 0
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}
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wm title . "OpenSSH"
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tk::PlaceWindow .
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vwait rc
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exit $rc
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