Initial more implementation

.gitignore

@@ -6,5 +6,6 @@ target/
 *~
 .*.swp
 .*.swo
+.idea
 Cargo.lock
 lib*.a

Cargo.toml

@@ -63,6 +63,7 @@ generic = [
   "ls",
   "mkdir",
   "mktemp",
+  "more",
   "nl",
   "nproc",
   "od",
@@ -144,6 +145,7 @@ mkdir    = { optional=true, path="src/mkdir" }
 mkfifo   = { optional=true, path="src/mkfifo" }
 mknod    = { optional=true, path="src/mknod" }
 mktemp   = { optional=true, path="src/mktemp" }
+more     = { optional=true, path="src/more" }
 mv       = { optional=true, path="src/mv" }
 nice     = { optional=true, path="src/nice" }
 nl       = { optional=true, path="src/nl" }

Makefile

@@ -66,6 +66,7 @@ PROGS       := \
   ls \
   mkdir \
   mktemp \
+  more \
   nl \
   nproc \
   od \

src/more/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "more"
+version = "0.0.1"
+authors = []
+
+[lib]
+name = "uu_more"
+path = "more.rs"
+
+[dependencies]
+getopts = "*"
+libc = "*"
+nix = "*"
+uucore = { path="../uucore" }
+
+[[bin]]
+name = "more"
+path = "main.rs"

src/more/main.rs

@@ -0,0 +1,5 @@
+extern crate uu_more;
+
+fn main() {
+    std::process::exit(uu_more::uumain(std::env::args().collect()));
+}

src/more/more.rs

@@ -0,0 +1,113 @@
+#![crate_name = "uu_more"]
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Jordy Dickinson <jordy.dickinson@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+extern crate getopts;
+
+#[macro_use]
+extern crate uucore;
+
+use getopts::Options;
+use std::io::{stdout, stdin, stderr, Write, Read, Result};
+use std::fs::File;
+
+extern crate nix;
+use nix::sys::termios;
+
+#[derive(Clone, Eq, PartialEq)]
+pub enum Mode {
+    More,
+    Help,
+    Version,
+}
+
+static NAME: &'static str = "more";
+static VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
+pub fn uumain(args: Vec<String>) -> i32 {
+    let mut opts = Options::new();
+
+    opts.optflag("h", "help", "display this help and exit");
+    opts.optflag("v", "version", "output version information and exit");
+
+    let matches = match opts.parse(&args[1..]) {
+        Ok(m) => m,
+        Err(e) => {
+            show_error!("{}", e);
+            panic!()
+        },
+    };
+    let usage = opts.usage("more TARGET.");
+    let mode = if matches.opt_present("version") {
+        Mode::Version
+    } else if matches.opt_present("help") {
+        Mode::Help
+    } else {
+        Mode::More
+    };
+
+    match mode {
+        Mode::More    => more(matches),
+        Mode::Help    => help(&usage),
+        Mode::Version => version(),
+    }
+
+    0
+}
+
+fn version() {
+    println!("{} {}", NAME, VERSION);
+}
+
+fn help(usage: &str) {
+    let msg = format!("{0} {1}\n\n\
+                       Usage: {0} TARGET\n  \
+                       \n\
+                       {2}", NAME, VERSION, usage);
+    println!("{}", msg);
+}
+
+fn more(matches: getopts::Matches) {
+    let mut files = matches.free;
+    let mut f = File::open(files.first().unwrap()).unwrap();
+    let mut buffer = [0; 1024];
+
+    let saved_term = termios::tcgetattr(0).unwrap();
+    let mut term = saved_term;
+    // Unset canonical mode, so we get characters immediately
+    term.c_lflag.remove(termios::ICANON);
+    // Disable local echo
+    term.c_lflag.remove(termios::ECHO);
+    termios::tcsetattr(0, termios::TCSADRAIN, &term).unwrap();
+
+    let mut end = false;
+    while let Ok(sz) = f.read(&mut buffer) {
+        if sz == 0 { break; }
+        stdout().write(&buffer[0..sz]).unwrap();
+        for byte in std::io::stdin().bytes() {
+            let byte = byte.unwrap();
+            match byte {
+                b' ' => break,
+                b'q' | 27 => {
+                    end = true;
+                    break;
+                },
+                _ => ()
+            }
+        }
+
+        if end { break;}
+    }
+
+    term.c_lflag.insert(termios::ICANON);
+    term.c_lflag.insert(termios::ECHO);
+    termios::tcsetattr(0, termios::TCSADRAIN, &term).unwrap();
+    println!("");
+}