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

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

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

// also work without string quote run_cmd!(du -ah . | sort -hr | head -n 10); ```

run_fun! --> FunResult

```rust 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()); ```

run_cmds! --> CmdResult

Run multiple commands in one block. If any command fails, just return Err(...). Each command should end with ';'.

rust run_cmds! { ls / | wc -w; echo "bad cmd"; ls -l /nofile; date; } output: bash INFO: Running "ls /| wc -w" ... 31 INFO: Running "echo "bad cmd"" ... bad cmd INFO: Running "ls -l /nofile" ... ls: cannot access '/nofile': No such file or directory Error: Custom { kind: Other, error: " ls -l /nofile exit with 2" }

Easy Reporting

rust info!("Running command xxx ..."); warn!("Running command failed"); err!("Copying failed"); die!("Command exit unexpectedly: {}", reason); output: bash INFO: Running command xxx ... WARN: Running command failed ERROR: Copying file failed FATAL: Command exit unexpectedly: disk is full

Complete Example

```rust use cmdlib::{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() {
    warn!("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 INFO: Running "du -ah . | sort -hr | head -n 5" ... INFO: Top 5 directories: 5.1M . 2.7M ./main 2.4M ./main2 8.0K ./lib.rs 4.0K ./main.rs INFO: Running "sleep 3" ... INFO: Running "ls /nofile" ... ls: cannot access '/nofile': No such file or directory WARN: Failed to run foo() INFO: Running "date +%Y" ... INFO: You are in year 2019