#! /usr/bin/env tclsh

puts "Welcome to mRandr"

namespace eval mRandrConfig {
        variable configDir 
        variable configFile
        variable devices

        set configDir ~/.screenlayout/
        set configFile mRandr.sh
        set devices [list]

        proc readConfig { } {
                variable configDir 
                variable configFile
                file mkdir $configDir
                set configFilePath [file join         $configDir $configFile]
                puts "reading in $configFilePath..."
                if {[catch {open $configFilePath r} data]} {
                        puts "Error readoing config file. \[$configFilePath\]"
                }
                while { [gets $data line] >= 0 } {
                        if { [string first xrandr $line] == 0} {
                                set xrandrLine $line
                        }
                }
                while {[set outLocation [string first --output $xrandrLine]] >= 0} {
                        set xrandrLine [string range $xrandrLine $outLocation+9 end]
                        if {[set outLocation [string first --output $xrandrLine]] >= 0} {
                                set tempDevice [string range $xrandrLine 0 $outLocation-2]
                                processDevice $tempDevice
                                set xrandrLine [string range $xrandrLine $outLocation-1 end]
                        } else {
                                processDevice $xrandrLine
                        }
                } 
        }
        proc processDevice { line } {
                variable devices 
                set outLocation2 [string first " " $line]
                set tempDevice [string range $line 0 $outLocation2-1]
                set tempConfig [string range $line $outLocation2+1 end]
                if {[set outLocation [string first --off $line]] < 0} {
                        lappend devices $tempDevice $tempConfig
                }
        }        

        proc devices { } {
                variable devices
                return $devices
        }        
}

namespace eval mRandr {
        variable devices
        variable configOptions
        set configOptions(DisplayPortXOptions) ""
        set configOptions(HDMIXOptions) ""
        set configOptions(DVIXOptions) ""

        proc processConfig { configDevices } {
                set i 0
                foreach {device config} $configDevices {
                        puts "device\[$i\]: $device"
                        puts "config\[$i\]: $config"
                        setDisplayVars $device $config
                        incr i
                }
        }        

        proc run_xRandr { } {
                variable devices
                variable configOptions
                puts -nonewline "Checking xrandr...  "
                if {[catch {set xresults [exec xrandr]} fid]} {
                    puts stderr "xrandr error: $fid"
                    exit 1
                } else {
                        puts "success."
                }
                set xresults [split $xresults "\n"]
                set devices ""
                foreach line $xresults {
                        set sourceScan [scan $line {%s %s}]
                        if {[lindex $sourceScan 1] == "connected"} {
                                append devices "[configureLine [lindex $sourceScan 0]] "
                                puts "Found [lindex $sourceScan 0]"
                        } elseif {[lindex $sourceScan 1] == "disconnected"} {
                                append devices "--output [lindex $sourceScan 0] --off "
                        }
                }        
        }

        proc configureLine { line } {
                variable configOptions
                switch -glob -- $line {
                        "DisplayPort*" {set configLine [subst $configOptions(DisplayPort)]}
                        "HDMI*" {set configLine [subst $configOptions(HDMI)] }
                  "DVI*" {set configLine [subst $configOptions(DVI)]}
                   default    { set configLine ""}
                }
                return $configLine
        }

        proc setDisplayVars { device config } {
                variable configOptions
                switch -glob -- $device {
                        "DisplayPort*" {set configOptions(DisplayPort) "--output \$line $config \$configOptions(DisplayPortXOptions)"}
                        "HDMI*" {set configOptions(HDMI) "--output \$line $config \$configOptions(HDMIXOptions)" }
                  "DVI*" {set configOptions(DVI) "--output \$line $config \$configOptions(DVIXOptions)"}
                }
        }

        proc setHDMIXOptions { newOptions } {
                variable configOptions
                set configOptions(HDMIXOptions) $newOptions
        }

        proc setDisplayPortXOptions { newOptions } {
                variable configOptions
                set configOptions(DisplayPortXOptions) $newOptions
        }        

        proc setDVIXOptions { newOptions } {
                variable configOptions
                set configOptions(DVIXOptions) $newOptions
        }

        proc devices { } {
                variable devices
                return $devices
        }
        proc runCommand { } {
                variable devices
                exec xrandr {*}$devices
        }

}

mRandrConfig::readConfig
mRandr::processConfig [mRandrConfig::devices]
mRandr::setHDMIXOptions "--set underscan on --set \"underscan hborder\" 50 --set \"underscan vborder\" 30"
mRandr::run_xRandr
puts "xrandr [mRandr::devices]"
mRandr::runCommand