From 695355b4882707a9f7ed0917d5188471f67f47b1 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg@phi-gamma.net>
Date: Mon, 15 Nov 2021 20:50:15 +0100
Subject: move console handling into lib

All operations are now exposed through wrappers that are member
functions of ``vtcol::Console``.
---
 src/vtcol.rs | 109 ++++++-----------------------------------------------------
 1 file changed, 10 insertions(+), 99 deletions(-)

(limited to 'src/vtcol.rs')

diff --git a/src/vtcol.rs b/src/vtcol.rs
index 0cc713c..d3399fc 100644
--- a/src/vtcol.rs
+++ b/src/vtcol.rs
@@ -1,10 +1,9 @@
 pub mod lib;
 
-use vtcol::{Fd, Palette, Scheme};
+use vtcol::{Console, Palette, Scheme};
 
 use anyhow::{anyhow, Result};
-use std::{io::{self, BufWriter, Error},
-          os::unix::io::AsRawFd,
+use std::{io::{self, BufWriter},
           sync::atomic::{AtomicBool, Ordering}};
 
 static VERBOSITY: AtomicBool = AtomicBool::new(false);
@@ -220,15 +219,12 @@ impl<'a> Job
 
     fn set_scheme(scheme: Scheme) -> Result<()>
     {
-        let pal = Palette::from(&scheme);
-        vrb!("Using palette:");
-        vrb!("{}", pal);
-        let fd = get_console_fd()?;
-        vrb!("console fd: {}", fd);
+        let con = Console::current()?;
+        vrb!("console fd: {}", con);
 
-        vtcol::ioctl_pio_cmap(&fd, &pal)?;
+        con.apply_scheme(&scheme)?;
+        con.clear()?;
 
-        clear_term(&fd)?;
         vrb!("successfully enabled scheme {:?}", scheme);
         /* It’s fine to leak the fd, the kernel will clean up anyways. */
         Ok(())
@@ -236,11 +232,10 @@ impl<'a> Job
 
     fn get_scheme() -> Result<()>
     {
-        let fd = get_console_fd()?;
+        let fd = Console::current()?;
         vrb!("console fd: {}", fd);
 
-        let pal = vtcol::ioctl_gio_cmap(&fd)?;
-        let scm = Scheme::from(pal);
+        let scm = fd.current_scheme()?;
 
         vrb!("active scheme:");
         println!("{}", scm);
@@ -253,12 +248,10 @@ impl<'a> Job
     */
     fn toggle_scheme(one: Scheme, two: Scheme) -> Result<()>
     {
-        let fd = get_console_fd()?;
+        let fd = Console::current()?;
         vrb!("console fd: {}", fd);
 
-        let pal = vtcol::ioctl_gio_cmap(&fd)?;
-
-        if pal == Palette::from(&one) {
+        if fd.current_palette()? == Palette::from(&one) {
             Self::set_scheme(two)
         } else {
             Self::set_scheme(one)
@@ -266,88 +259,6 @@ impl<'a> Job
     }
 } /* [impl Job] */
 
-const CONSOLE_PATHS: [&str; 6] = [
-    "/proc/self/fd/0",
-    "/dev/tty",
-    "/dev/tty0",
-    "/dev/vc/0",
-    "/dev/systty",
-    "/dev/console",
-];
-
-fn fd_of_path(path: &std::path::Path) -> Option<vtcol::Fd>
-{
-    let p = std::ffi::CString::new(path.to_str().unwrap()).unwrap();
-    match unsafe { libc::open(p.as_ptr(), libc::O_RDWR | libc::O_NOCTTY, 0) } {
-        -1 => None,
-        fd => {
-            vrb!("  *> got fd");
-            if unsafe { libc::isatty(fd) } == 0 {
-                vrb!("  *> not a tty");
-                return None;
-            }
-
-            let mut tty_type: libc::c_char = 0;
-
-            let res = unsafe {
-                libc::ioctl(fd, vtcol::KDGKBTYPE, &mut tty_type as *mut _)
-            };
-            if res < 0 {
-                vrb!("  *> ioctl failed");
-                return None;
-            }
-
-            if tty_type != vtcol::KB_101 {
-                return None;
-            }
-
-            Some(Fd::from(fd))
-        },
-    }
-}
-
-fn get_console_fd() -> Result<Fd>
-{
-    for path in CONSOLE_PATHS.iter() {
-        vrb!("trying path: {:?}", path);
-        let path = std::path::Path::new(path);
-        if let Some(fd) = fd_of_path(path) {
-            vrb!(" * Success!");
-            return Ok(fd);
-        }
-    }
-    Err(anyhow!("could not retrieve fd for any of the search paths"))
-}
-
-fn write_to_term(fd: &Fd, buf: &str) -> Result<()>
-{
-    let len = buf.len() as libc::size_t;
-
-    if unsafe {
-        libc::write(fd.as_raw_fd(), buf.as_ptr() as *const libc::c_void, len)
-    } != len as isize
-    {
-        Err(anyhow!(
-            "failed to write {} B to fd {}: {}",
-            len,
-            fd,
-            Error::last_os_error()
-        ))
-    } else {
-        Ok(())
-    }
-}
-
-fn clear_term(fd: &Fd) -> Result<()>
-{
-    let clear = "\x1b[2J";
-    let cursor = "\x1b[1;1H";
-    write_to_term(fd, clear)?;
-    write_to_term(fd, cursor)?;
-
-    Ok(())
-}
-
 fn main() -> Result<()>
 {
     let job = Job::from_argv()?;
-- 
cgit v1.2.3