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viewcontroller.go

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package main

import (

"time"

"github.com/gdamore/tcell"

)

// globally defined selected line starts at 1 to account for header width.

// sl is the line within the view, it does not represent the line in the currentSplit

var sl = 1

// loop ... main execution loop. Figure out wtf is happening here.

func loop(s tcell.Screen) {

quit := make(chan struct{})

go func() {

for {

ev := s.PollEvent()

switch ev := ev.(type) {

case *tcell.EventKey:

switch ev.Key() {

case tcell.KeyCtrlC:

close(quit)

return

case tcell.KeyDown:

moveSelectedLine(1, sl, len(currentSplit), 1, 1)

case tcell.KeyUp:

moveSelectedLine(-1, sl, len(currentSplit), 1, 1)

case tcell.KeyLeft:

case tcell.KeyRight:

//determine index into selectedSlice that selectedline is pointed at.

//pass selectedline to windowstring to messageretrieve

//messageRetrieve()

}

case *tcell.EventResize:

s.Sync()

windowWidth, windowHeight = s.Size()

}

}

}()

loop:

// get good at go and learn channels, routines and selects properly.

for {

select {

case <-quit:

break loop

// what do you do

case <-time.After(time.Millisecond * 5):

}

populateView(s)

}

s.Fini()

}

// moveSelectedLine ... Return the currently selected line with deviation specified by amount value.

// Amount should only ever be 1 or -1. The logic in moveSelectedLine is not robust enough

// to safely handle other values.

func moveSelectedLine(amount int, selectedline int, lenlines int, headerheight int, footerheight int) {

// if amount is a negative value and the currently selected line is the top (ie, headerwidth), keep it at the

// at the index that's the same thickness as the header.

if (amount < 0) && (selectedline == headerheight) {

sl = headerheight

// if the amount is positive and the currently selected line is at the max of the window, including the footer,

// then return the max value.

} else if (amount > 0) && (selectedline == windowHeight-footerheight-1) {

sl = windowHeight - footerheight - 1

} else if (amount > 0) && (selectedline == lenlines-1) {

sl = lenlines - 1

} else {

sl = selectedline + amount

}

}

// windowString ... takes a chunk of text delimited by newlines and returns a specified portion of it

// that fits within the current size of the terminal window. A number of lines to offset

// into the original message must be provided by the offset integer.

// windowheight will usually be an integer that starts at 1 whereas offset is likely

// starting from 0. When passing variables to this function, it is recommended to increment

// offset by 1.

// The function does not return a reduced portion of the input message if it has less lines

// than windowheight.

func currentWindow(lines []string, offset int, headerheight int, footerheight int) []string {

limit := windowHeight - headerheight - footerheight

if limit >= len(lines) {

return lines

}

if offset > limit {

return lines[offset-limit : offset]

}

return lines[0:limit]

}