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Get terminal size two ways

This commit is contained in:
Timothy Warren 2021-03-24 13:24:40 -04:00
parent 835f550bbb
commit 0902d494c5
2 changed files with 60 additions and 21 deletions
internal
editor
terminal

View File

@ -1,9 +1,6 @@
package editor
import (
"bufio"
"os"
"timshome.page/gilo/internal/char"
"timshome.page/gilo/internal/terminal"
)
@ -13,19 +10,10 @@ type Editor struct {
cols int
}
var reader = bufio.NewReader(os.Stdin)
func readKey() (rune, int) {
ch, size, err := reader.ReadRune()
if err != nil {
panic(err)
}
return ch, size
}
func drawRows() {
for y :=0; y < 24; y += 1 {
_, rows := terminal.Size()
for y :=0; y < rows; y += 1 {
terminal.OutLn("~")
}
}
@ -40,7 +28,7 @@ func RefreshScreen() {
}
func ProcessKeypress() bool {
ch, _ := readKey()
ch, _ := terminal.ReadKey()
// Clean up on exit
if ch == char.Ctrl('q') {

View File

@ -1,6 +1,7 @@
package terminal
import (
"bufio"
"fmt"
"os"
@ -10,6 +11,17 @@ import (
const ClearScreen = "2J"
const ResetCursor = "H"
var reader = bufio.NewReader(os.Stdin)
func ReadKey() (rune, int) {
ch, size, err := reader.ReadRune()
if err != nil {
panic(err)
}
return ch, size
}
// Is this a valid interactive terminal?
func check() {
if !term.IsTerminal(int(os.Stdin.Fd())) {
@ -41,13 +53,52 @@ func ANSICode (code string) {
fmt.Printf("\x1b[%s", code)
}
func Size () (width int, height int) {
width, height, err := term.GetSize(int(os.Stdin.Fd()))
func sizeTrick () (rows int, cols int) {
// Move cursor to location further than likely screen size
// The cursor will move to maximum available position
fmt.Print("\x1b[999C\x1b[99B")
// Ask the terminal where the cursor is
fmt.Print("\x1b[6n")
// Read stdin looking for the reported location
buffer := ""
for char, _ := ReadKey(); char != 'R'; char, _ = ReadKey() {
if char == '\x1b' || char == '[' {
continue
}
if char == 'R' || char == '\x00'{
break
}
buffer += string(char)
}
_, err := fmt.Sscanf(buffer, "%d;%d", &rows, &cols)
if err != nil {
panic(err)
}
return rows, cols
}
func Size () (width int, height int) {
width = 80
height = 24
// Try the syscall first
width, height, err := term.GetSize(int(os.Stdin.Fd()))
if err == nil {
return width, height
}
// Figure out the size the hard way
height, width = sizeTrick()
OutLn("%d Rows, %d Cols", height, width)
return width, height
}