~sircmpwn/lpsh

607683bf7c6c7868416ec8dda0f8f3f1b03ccb4a — Drew DeVault 1 year, 2 months ago 623439c master
Various fixes

Which I am too lazy to split into seaparate commits
2 files changed, 38 insertions(+), 22 deletions(-)

M lpsh.go
M todo
M lpsh.go => lpsh.go +36 -20
@@ 1,6 1,7 @@
package main

import (
	"fmt"
	"os"
	"os/exec"
	"time"


@@ 8,36 9,46 @@ import (
	"git.sr.ht/~sircmpwn/pty"
)

// TODO: Talk directly to CUPS/the printer?
func lpr(data []byte) {
	lpr := exec.Command("/usr/bin/lpr", "-l")
	pipe, err := lpr.StdinPipe()
func lptl(data []byte) []byte {
	out := make([]byte, len(data))
	for _, b := range data {
		switch b {
			case '\b':
			out = append(out, []byte("^H")...)
		default:
			out = append(out, b)
		}
	}
	return out
}

func lpmgr(in chan (interface{}), out chan ([]byte)) {
	// TODO: Runtime configurable option? Discover printers? dunno
	f, err := os.OpenFile("/dev/usb/lp9", os.O_RDWR, 0755)
	if err != nil {
		panic(err)
	}
	go func() {
		defer pipe.Close()
		pipe.Write(data)
	}()
	lpr.Run()
}

func lprmgr(out chan ([]byte)) {
	lpr([]byte("\n\n\n\r"))
	feed := false
	f.Write([]byte("\n\n\n\r"))

	timeout := 250 * time.Millisecond
	for {
		select {
		case <-in:
			// Increase the timeout after input
			timeout = 1 * time.Second
		case data := <-out:
			if feed {
				lpr([]byte("\x1Bj\xD8\x1Bj\xD8\x1Bj\x6C"))
				f.Write([]byte("\x1Bj\xD8\x1Bj\xD8\x1Bj\x6C"))
				feed = false
			}
			lpr(data)
		case <-time.After(250 * time.Millisecond):
			f.Write(lptl(data))
		case <-time.After(timeout):
			timeout = 200 * time.Millisecond
			if !feed {
				feed = true
				lpr([]byte("\x1BJ\xD8\x1BJ\xD8\x1BJ\x6C"))
				f.Write([]byte("\x1BJ\xD8\x1BJ\xD8\x1BJ\x6C"))
			}
		}
	}


@@ 49,16 60,20 @@ func main() {
		Rows: 24,
	}
	cmd := exec.Command("/bin/sh")
	cmd.Env = append(os.Environ(), "TERM=lp")
	cmd.Env = append(os.Environ(),
		"TERM=lp",
		fmt.Sprintf("COLUMNS=%d", 180))
	tty, err := pty.StartWithSize(cmd, &winsize)
	if err != nil {
		panic(err)
	}

	// TODO: This could be done with tcsetattr if we cared enough
	exec.Command("stty", "-F", "/dev/tty", "cbreak", "min", "1").Run()

	lprch := make(chan ([]byte))
	go lprmgr(lprch)
	inch := make(chan (interface{}))
	outch := make(chan ([]byte))
	go lpmgr(inch, outch)

	inbuf := make([]byte, 4096)
	go func() {


@@ 68,6 83,7 @@ func main() {
				panic(err)
			}
			tty.Write(inbuf[:n])
			inch <- nil
		}
	}()



@@ 79,6 95,6 @@ func main() {
		}
		b := make([]byte, n)
		copy(b, outbuf[:n])
		lprch <- b
		outch <- b
	}
}

M todo => todo +2 -2
@@ 1,3 1,3 @@
- Write directly to printer
- Rig into libinput and skip stdin from a parent session
- Make input timings work more effectively
- print more escapes, such as ^w and term escapes
- filter out colors