Initial import of pstop v0.0.10

[pstop.git] / screen / screen.go

diff --git a/screen/screen.go b/screen/screen.go
new file mode 100644 (file)
index 0000000..1490adf
--- /dev/null
+++ b/screen/screen.go
@@ -0,0 +1,100 @@
+// This file configures the screen, basically remembering the size
+// and foreground and background colours.
+package screen
+
+import (
+       "fmt"
+       "log"
+       "os"
+
+       "github.com/nsf/termbox-go"
+
+       "github.com/sjmudd/pstop/lib"
+       "github.com/sjmudd/pstop/version"
+)
+
+// this just allows me to use stuff with it
+type TermboxScreen struct {
+       width, height int
+       fg, bg        termbox.Attribute
+}
+
+type TermboxAttribute termbox.Attribute
+
+// reset the termbox to a clear screen
+func (s *TermboxScreen) Initialise() {
+       err := termbox.Init()
+       if err != nil {
+               fmt.Println("Could not start termbox for " + lib.MyName() + ". View ~/." + lib.MyName() + ".log for error messages.")
+               log.Printf("Cannot start "+lib.MyName()+", termbox.Init() gave an error:\n%s\n", err)
+               os.Exit(1)
+       }
+
+       s.Clear()
+       s.fg = termbox.ColorDefault
+       s.bg = termbox.ColorDefault
+
+       x, y := termbox.Size()
+       s.SetSize(x, y)
+}
+
+// clear the screen
+func (s *TermboxScreen) Clear() {
+       termbox.Clear(termbox.ColorWhite, termbox.ColorBlack)
+}
+
+func (s *TermboxScreen) Flush() {
+       termbox.Flush()
+}
+
+func (s *TermboxScreen) SetSize(width, height int) {
+       // if we get bigger then clear out the bottom line
+       for x := 0; x < s.width; x++ {
+               termbox.SetCell(x, s.height-1, ' ', s.fg, s.bg)
+       }
+       s.Flush()
+
+       s.width = width
+       s.height = height
+}
+
+func (s *TermboxScreen) Size() (int, int) {
+       return s.width, s.height
+}
+
+func (s *TermboxScreen) Height() int {
+       return s.height
+}
+
+// print the characters but don't print them outside the screen
+func (s *TermboxScreen) PrintAt(x int, y int, text string) {
+       offset := 0
+       for c := range text {
+               if (x + offset) < s.width {
+                       termbox.SetCell(x+offset, y, rune(text[c]), s.fg, s.bg)
+                       offset++
+               }
+       }
+       s.Flush()
+}
+
+func (s *TermboxScreen) DisplayHelp() {
+       s.PrintAt(0, 0, lib.MyName()+" version "+version.Version()+" (C) 2014 Simon J Mudd <sjmudd@pobox.com>")
+
+       s.PrintAt(0, 2, "Program to show the top I/O information by accessing information from the")
+       s.PrintAt(0, 3, "performance_schema schema. Ideas based on mysql-sys.")
+
+       s.PrintAt(0, 5, "Keys:")
+       s.PrintAt(0, 6, "- - reduce the poll interval by 1 second (minimum 1 second)")
+       s.PrintAt(0, 7, "+ - increase the poll interval by 1 second")
+       s.PrintAt(0, 8, "h - this help screen")
+       s.PrintAt(0, 9, "q - quit")
+       s.PrintAt(0, 10, "t - toggle between showing time since resetting statistics or since P_S data was collected")
+       s.PrintAt(0, 11, "z - reset statistics")
+       s.PrintAt(0, 12, "<tab> - change display modes between: latency, ops, file I/O and lock modes")
+       s.PrintAt(0, 14, "Press h to return to main screen")
+}
+
+func (s *TermboxScreen) Close() {
+       termbox.Close()
+}