rem //////////////////////////////////////////////////////////
rem Program: Hreodwrit - A writing pen
rem Author:  Bill Chatfield
rem License: GPL2
rem //////////////////////////////////////////////////////////

section variables
    dim b$(500) { Editing buffer }
    d$=chr$(4)
    f${nameOfFileInEditor}=""
    lc{lineCount}=0
    ml{maxLines}=500
    mc{maxColumns}=255
    cx{currentScreenX}=1
    cy{currentScreenY}=1
    cl{currentLineInFile}=1
    cc{currentColumnInFile}=1
    sw{screenWidth}=40
    sh{screenHeight}=24
    bm{bufferModified}=0
    oa{openApple}=0
closesection

section splash
    text
    print "Hreodwrit - A writing pen"
    print "Copyright (c) 2019 Bill Chatfield"
    print "Distributed under the GPLv2"
closesection

section main
    gosub @openFile
    gosub @display
    £eventLoop
        # Check open apple and closed apple keys
        get k$
        if peek(49249) > 127 then goto @openApplePressed
            if asc(k$) = 3 then gosub @copyText

        £openApplePressed
            if k$ = "s" then gosub @saveFile

            
    goto @eventLoop
    
    £atExit
    if bm{bufferModified} = 0 then goto @exit
        print "Save file ";f${nameOfFileInEditor};"? (Y/N) ";
        get k$
        print k$
        if k$ = "y" or k$ = "Y" then gosub @saveFile

    £exit
    end
closesection

£openFile
    print "File:";
    input f$
    if f$ = "" then return
    print d$;"open";f$
    print d$;"read";f$
    lc{lineCount}=0
    on err goto @errorHandler
    £readLineLoop
        if lc{lineCount} < ml{maxLines} then goto @addLine
            print "File too large: ";f${nameOfFileInEditor}
            print d$;"close";f$
            end
        £addLine
        lc{lineCount}=lc{lineCount}+1
        input b$(lc{lineCount})
    goto @readLineLoop
    £errorHandler
        poke 216,0 { Turn off error handler }
        e = peek(222) { Get the error code }
        print d$;"close";f$ { Close the open file }        
        if e < > 5 then goto @die { 5 is the expected EOF }
return

£saveFile
    print d$;"open";f$
    print d$;"write";f$
    on err goto @errorHandler
    for i = 1 to lc{lineCount}
        print b$(i)
    next
    £errorHandler
        poke 216,0 { Turn off error handler }
        e = peek(222) { Get the error code }
        print d$;"close";f$ { Close the open file }        
        goto @die
return


£saveAsFile
    print "File:";
    input f$
    print d$;"open";f$
    print d$;"write";f$
    on err goto @errorHandler
    for i = 1 to lc{lineCount}
        print b$(i)
    next
    £errorHandler
        poke 216,0 { Turn off error handler }
        e = peek(222) { Get the error code }
        print d$;"close";f$ { Close the open file }        
        goto @die
return


£display
	home
	for i = 1 to 24
		print b$(i)
	next
return

£die
    print "Error ";e
end