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Rewrite imag binary in Rust

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Matthias Beyer 2016-05-12 18:49:14 +02:00
parent 9f528fb929
commit 27124c2a83
3 changed files with 184 additions and 79 deletions
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10
bin/Cargo.toml Normal file
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[package]
name = "imag"
version = "0.1.0"
authors = ["Matthias Beyer <mail@beyermatthias.de>"]
[dependencies]
version = "2.0"
walkdir = "0.1.5"
crossbeam = "0.2.9"

79
bin/imag
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#!/usr/bin/env bash
version() {
echo "0.1.0"
}
help() {
local cmds="$(commands)"
echo " _ ";
echo " (_)_ __ ___ __ _ __ _ ";
echo " | | '_ \` _ \ / _\` |/ _\` |";
echo " | | | | | | | (_| | (_| |";
echo " |_|_| |_| |_|\__,_|\__, |";
echo " |___/ ";
echo " -------------------------";
cat <<EOS
Usage: imag [--version | --versions | -h | --help] <command> <args...>
imag - the personal information management suite for the commandline
imag is a PIM suite for the commandline. It consists of several commands,
called "modules". Each module implements one PIM aspect and all of these
modules can be used independently.
Available commands:
$(for cmd in $cmds; do
echo -e "\t$(echo $cmd | sed -r 's,(.*)/imag-(.*),\2,')";
done)
Call a command with "imag <command> <args>"
Each command can be called with "--help" to get the respective helptext.
Please visit https://github.com/matthiasbeyer/imag to view the source code,
follow the development of imag or maybe even contribute to imag.
imag is free software. It is released under the terms of LGPLv2.1
(c) 2016 Matthias Beyer and contributors
EOS
}
commands() {
[[ ! -z "$IMAG_IS_THE_SHIT" ]] && \
find $IMAG_IS_THE_SHIT -type f -iname "imag-*" -print 2>/dev/null
find ${PATH//:/ } -maxdepth 1 -type f -iname "imag-*" -print 2>/dev/null
}
main() {
case $1 in
--versions)
echo -n "imag "; version
for command in $(commands); do
$command --version
done
exit 0
;;
--version)
version
exit 0
;;
--help | -h)
help
exit 0
;;
*)
local cmd=$1; shift
local executable=$(commands | grep $cmd | head -n 1)
exec $executable $*
;;
esac
}
main $*

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bin/src/main.rs Normal file
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extern crate crossbeam;
#[macro_use] extern crate version;
extern crate walkdir;
use std::env;
use std::process::exit;
use std::process::Command;
use std::process::Stdio;
use std::io::ErrorKind;
use walkdir::WalkDir;
use crossbeam::*;
fn help(cmds: Vec<String>) {
println!(r#"
_
(_)_ __ ___ __ _ __ _
| | '_ \` _ \/ _\`|/ _\`|
| | | | | | | (_| | (_| |
|_|_| |_| |_|\__,_|\__, |
|___/
-------------------------
Usage: imag [--version | --versions | -h | --help] <command> <args...>
imag - the personal information management suite for the commandline
imag is a PIM suite for the commandline. It consists of several commands,
called "modules". Each module implements one PIM aspect and all of these
modules can be used independently.
Available commands:
"#);
for cmd in cmds.iter() {
println!("\t{}", cmd);
}
println!(r#"
Call a command with 'imag <command> <args>'
Each command can be called with "--help" to get the respective helptext.
Please visit https://github.com/matthiasbeyer/imag to view the source code,
follow the development of imag or maybe even contribute to imag.
imag is free software. It is released under the terms of LGPLv2.1
(c) 2016 Matthias Beyer and contributors"#);
}
fn get_commands() -> Vec<String> {
let path = env::var("PATH");
if path.is_err() {
println!("PATH error: {:?}", path);
exit(1);
}
let pathelements = path.unwrap();
let pathelements = pathelements.split(":");
let joinhandles : Vec<ScopedJoinHandle<Vec<String>>> = pathelements
.map(|elem| {
crossbeam::scope(|scope| {
scope.spawn(|| {
WalkDir::new(elem)
.max_depth(1)
.into_iter()
.filter(|path| {
match path {
&Ok(ref path) => path.path().starts_with(format!("{}/imag-", elem)),
&Err(_) => false,
}
})
.filter_map(|x| x.ok())
.map(|path| {
path.path()
.to_str()
.map(String::from)
})
.filter_map(|x| x)
.collect()
})
})
})
.collect();
let mut execs = vec![];
for joinhandle in joinhandles.into_iter() {
let mut v = joinhandle.join();
execs.append(&mut v);
}
execs
}
fn main() {
let commands = get_commands();
let mut args = env::args();
let _ = args.next();
let first_arg = match args.next() {
Some(s) => s,
None => {
help(commands);
exit(0);
},
};
match &first_arg[..] {
"--help" | "-h" => {
help(commands);
exit(0);
},
"--version" => println!("imag {}", &version!()[..]),
"--versions" => {
let mut result = vec![];
for command in commands.iter() {
result.push(crossbeam::scope(|scope| {
scope.spawn(|| {
let v = Command::new(command).arg("--version").output();
match v {
Ok(v) => match String::from_utf8(v.stdout) {
Ok(s) => format!("{} -> {}", command, s),
Err(e) => format!("Failed calling {} -> {:?}", command, e),
},
Err(e) => format!("Failed calling {} -> {:?}", command, e),
}
})
}))
}
for versionstring in result.into_iter().map(|handle| handle.join()) {
println!("{}", versionstring);
}
},
s => {
match Command::new(format!("imag-{}", s))
.stdin(Stdio::inherit())
.stdout(Stdio::inherit())
.stderr(Stdio::inherit())
.spawn()
.and_then(|mut handle| handle.wait())
{
Ok(exit_status) => {
if !exit_status.success() {
println!("{} exited with non-zero exit code", s);
exit(exit_status.code().unwrap_or(42));
}
},
Err(e) => {
match e.kind() {
ErrorKind::NotFound => {
println!("No such command: 'imag-{}'", s);
exit(2);
},
ErrorKind::PermissionDenied => {
println!("No permission to execute: 'imag-{}'", s);
exit(1);
},
_ => {
println!("Error spawning: {:?}", e);
exit(1337);
}
}
}
}
},
}
}