Command-line library for writing rust style shell scripts

Common rust command-line macros and utilities, to write shell-script like tasks easily in rust programming language. Available at crates.io.

run_cmd! --> CmdResult

```rust let name = "rust"; runcmd!(echo $name)?; runcmd!(|name| echo "hello, $name")?;

// pipe commands are also supported run_cmd!(du -ah . | sort -hr | head -n 10)?;

// or a group of commands // if any command fails, just return Err(...) let file = "/tmp/f"; let keyword = "rust"; if runcmd! { cat ${file} | grep ${keyword}; echo "bad cmd"; ls -l /nofile; date; }.iserr() { warn!("Run group command failed"); } ```

run_fun! --> FunResult

```rust let version = run_fun!(rustc --version).unwrap(); eprintln!("Your rust version is {}", version);

// with pipes let n = run_fun!(echo "the quick brown fox jumped over the lazy dog" | wc -w).unwrap(); eprintln!("There are {} words in above sentence", n); ```

Run pipe commands in the builder style

These are low level APIs, without using macros. Parameters could be passed much clearer in this style: ```rust Process::new("du -ah .") .pipe("sort -hr") .pipe("head -n 5") .wait::()?; // the same runcmd! macro runcmd!(du -ah . | sort -hr | head -n 10)?;

Process::new("ls") .pipe("wc -l") .current_dir("/src/rust-shell-script/") .wait::()?; ```

Builtin commands

cd

cd: set procecess current directory rust run_cmd! { cd /tmp; ls | wc -l; }; Notice that builtin cd will only change with current scope and it will restore the previous current directory when it exits the scope.

Use std::env::set_current_dir if you want to change the current working directory for the whole program.

Complete Example

```rust use cmdlib::{runcmd, run_fun, CmdResult, FunResult};

fn foo(time: &str) -> CmdResult { let wait = 3; run_cmd!{ sleep $wait; ls $f; } }

fn getyear() -> FunResult { runfun!(date +%Y) }

fn main() -> CmdResult { run_cmd!(cd /tmp; ls | wc -l;)?;

let name = "rust";
run_cmd!(echo "hello, $name")?;

let result = run_fun!(du -ah . | sort -hr | head -n 5)?;
eprintln!("Top 5 directories:\n{}", result);

if foo().is_err() {
    eprintln!("Failed to run foo()");
}

if get_year()? == "2020" {
    eprintln!("You are in year 2020");
} else {
    eprintln!("Which year are you in ?");
}

Ok(())

} ```

Related

See rust-shell-script, which can compile rust-shell-script scripting language directly into rust code.