cmd_lib - Rust command line library

Common rust command line macros and utils, to write shell script like tasks easily in rust programming language.

run_cmd! --> CmdResult

``` let name = "rust"; run_cmd!("echo hello, {}", name);

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

run_fun! --> FunResult

``` let version = run_fun!("rustc --version")?; info!("Your rust version is {}", version.trim());

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

Complete example

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

fn foo() -> CmdResult { runcmd!("sleep 3")?; runcmd!("ls /nofile")?; Ok(()) }

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

fn main() -> CmdResult { let result = run_fun!("du -ah . | sort -hr | head -n 5")?; info!("Top 5 directories:\n{}", result.trim());

if !foo().is_ok() {
    info!("Failed to run foo()");
}

if get_year()?.trim() == "2019" {
    info!("You are in year 2019");
} else {
    info!("Which year are you in ?");
}

Ok(())

} ```

output: bash Running "du -ah . | sort -hr | head -n 5" ... Top 5 directories: 18M . 2.7M ./main 2.6M ./pipe3 2.6M ./pipe2 2.6M ./echo Running "sleep 3" ... Running "ls /nofile" ... ls: cannot access '/nofile': No such file or directory Failed to run foo() Running "date +%Y" ... You are in year 2019

Related

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