commit d24d6f174f690d49014a5a3389210612ec254153
Author: Avril <flanchan@cumallover.me>
Date:   Wed Dec 23 20:39:32 2020 +0000

    initial commit

diff --git a/.gitignore b/.gitignore
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index 0000000..e2a3069
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+ "cfg-if 1.0.0",
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+ "winapi 0.3.9",
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+ "fnv",
+ "futures-core",
+ "iovec",
+ "lazy_static",
+ "libc",
+ "memchr",
+ "mio",
+ "mio-named-pipes",
+ "mio-uds",
+ "num_cpus",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "slab",
+ "tokio-macros",
+ "winapi 0.3.9",
+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
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+dependencies = [
+ "winapi 0.3.9",
+]
+
+[[package]]
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+[[package]]
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+ "winapi 0.2.8",
+ "winapi-build",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..603ca80
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "batchtask"
+version = "0.1.0"
+authors = ["Avril <flanchan@cumallover.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ad-hoc-iter = "0.2.2"
+color-eyre = {version = "0.5.10", default-features=false}
+futures = "0.3.8"
+lazy_format = "1.8.3"
+lazy_static = "1.4.0"
+log = "0.4.11"
+pretty_env_logger = "0.4.0"
+recolored = "1.9.3"
+tokio = {version = "0.2", features = ["full"]}
diff --git a/src/arg/mod.rs b/src/arg/mod.rs
new file mode 100644
index 0000000..a46cfba
--- /dev/null
+++ b/src/arg/mod.rs
@@ -0,0 +1,113 @@
+//! Handles arg parsing
+use super::*;
+use std::fmt;
+
+/// The name of the process that was invoked
+#[inline] pub fn prog_name() -> &'static str
+{
+    lazy_static! {
+	static ref NAME: String = std::env::args().next().unwrap();
+    }
+    &NAME[..]
+}
+
+#[inline] fn options() -> impl Iterator<Item = impl fmt::Display>
+{
+    struct Opt(&'static [&'static str], Option<&'static str>, &'static str, usize, bool);
+
+    impl Opt
+    {
+	const fn with_def(self, vl: bool) -> Self
+	{
+	    Self(self.0, self.1, self.2, self.3, vl)
+	}
+    }
+
+    macro_rules! opt {
+	($($name:literal),* => $num:literal; $desc:literal $(, $def:literal)?) => {
+	    {
+		let o = Opt(&[$($name),*], Some($num), $desc, 1, false);
+		$(let o = o.with_def($def);)?
+		    o
+	    }
+	};
+	($($name:literal),* => $num:literal; * $tabs:literal $desc:literal $(, $def:literal)?) => {
+	    {
+		let o = Opt(&[$($name),*], Some($num), $desc, $tabs, false);
+		$(let o = o.with_def($def);)?
+		    o
+	    }
+	};
+	($($name:literal),*; $desc:literal $(, $def:literal)?) => {
+	    {
+		let o = Opt(&[$($name),*], None, $desc, 1, false);
+		$(let o = o.with_def($def);)?
+		    o
+	    }
+	};
+	($($name:literal),*; * $tabs:literal  $desc:literal  $(, $def:literal)?) => {
+	    {
+		let o = Opt(&[$($name),*], None, $desc, $tabs, false);
+		$(let o = o.with_def($def);)?
+		    o
+	    }
+	};
+    }
+    impl fmt::Display for Opt
+    {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+	{
+	    write!(f, " {}", self.0.iter().join(", "))?;
+	    if let Some(mx) = self.1 {
+		write!(f, "  {}", mx)?;
+	    }
+	    write!(f, ":")?;
+	    for ch in std::iter::repeat('\t').take(self.3)
+	    {
+		use std::fmt::Write;
+		f.write_char(ch)?;
+	    }
+	    
+	    write!(f,"{}", self.2)?;
+	    if self.4 {
+		use recolored::Colorize;
+		write!(f, " ({})", "default".bold().bright_red())?;
+	    }
+	    Ok(())
+	}
+    }
+
+    iter![
+	opt!("--limit", "-l" => "<max children>"; "Limit the number of child processes running at once."),
+	opt!("--auto-limit", "-m"; * 2 "Limit to max number of CPUs + 1", true),
+	opt!("--unlimit", "-U"; * 3 "No limit to number of processes spawned at once")
+    ]
+}
+
+/// Print usage
+pub fn print_usage()
+{
+    use recolored::Colorize;
+    
+    println!(r#"batchtask v{version} - advanced process batching
+ by {author} with <3 (licensed GPL3+)"#,
+	     version = env!("CARGO_PKG_VERSION"),
+	     author = env!("CARGO_PKG_AUTHORS"));
+    println!(r#"
+Usage: {prog} [OPTIONS]...
+Usage: {prog} --help
+
+[{OPTIONS}]:
+{opts}
+"#,
+	     prog = prog_name(),
+	     OPTIONS = "OPTIONS".bright_blue().bold(),
+	     opts = options().map(|x| lazy_format!("{}", x)).join("\n"));
+}
+
+/// Print usage then exit
+#[inline(always)] pub fn usage() -> !
+{
+    print_usage();
+    std::process::exit(1)
+}
diff --git a/src/ext.rs b/src/ext.rs
new file mode 100644
index 0000000..db8d1e9
--- /dev/null
+++ b/src/ext.rs
@@ -0,0 +1,30 @@
+use super::*;
+use std::fmt;
+
+pub trait JoinStrsExt: Sized
+{
+    /// Join an iterator of `str` with a seperator
+    fn join(self, with: &str) -> String;
+}
+
+impl<T,I> JoinStrsExt for I
+where I: IntoIterator<Item=T>,
+      T: fmt::Display
+{
+    /// Join an iterator of `str` with a seperator
+    fn join(self, with: &str) -> String
+    {
+	let mut output = String::new();
+	let mut first=true;
+	for string in self.into_iter()
+	{
+	    if !first {
+		output.push_str(with);
+	    }
+	    let string = string.to_string();
+	    output.push_str(&string[..]);
+	    first=false;
+	}
+	output
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..cdbf751
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,52 @@
+#![feature(min_const_generics)]
+
+#![allow(dead_code)]
+
+#[macro_use] extern crate log;
+#[macro_use] extern crate lazy_static;
+#[macro_use] extern crate lazy_format;
+#[macro_use] extern crate ad_hoc_iter;
+
+use color_eyre::{
+    eyre::{
+	eyre,
+	self,
+
+	WrapErr as _,
+    },
+    SectionExt as _,
+};
+
+mod ext;
+use ext::*;
+
+mod arg;
+
+#[inline] fn init() -> Result<(), eyre::Report>
+{
+    color_eyre::install()?;
+    pretty_env_logger::init();
+    
+    trace!("installed panic handler & logger");
+    Ok(())
+}
+
+async fn real_main() -> Result<i32, eyre::Report>
+{
+    init().wrap_err(eyre!("Failed to initialise logger / panic handler"))?;
+
+    arg::print_usage();
+    
+    Ok(0)
+}
+
+#[tokio::main]
+async fn main() -> Result<(), eyre::Report> {
+    Ok(match real_main().await? {
+	0 => trace!("Exiting with normal code 0"),
+	ex => {
+	    warn!("Exiting with nonzero exit code: {}", ex);
+	    std::process::exit(ex)
+	},
+    })
+}