autosway 0.5.0

Automation program
Documentation 
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use super::*;
use std::env;
use std::path::PathBuf;
use std::process;
use std::sync::Arc;

pub struct Os;
impl Module for Os {
    fn load(&self, state: &mut State) -> Result<(), LuaError> {
        let module = state.lua.create_table()?;

        module.set(
            "exec",
            state
                .lua
                .create_function(|lua, (name, args): (String, Vec<String>)| {
                    let path = PathBuf::from(&name);
                    let exec = if path.try_exists().is_ok() || path.is_absolute() {
                        path
                    } else {
                        match urs::misc::search_in_path(&name) {
                            Some(p) => p,
                            None => return Err(LuaError::runtime("Executable not found")),
                        }
                    };

                    let output = match process::Command::new(exec).args(args).output() {
                        Ok(o) => o,
                        Err(e) => return Err(LuaError::external(Arc::new(e))),
                    };

                    match String::from_utf8(output.stdout) {
                        Ok(string) => Ok(string.trim().into_lua(lua)?),
                        Err(e) => Err(LuaError::external(Arc::new(e))),
                    }
                })?,
        )?;

        module.set(
            "get_pid",
            state
                .lua
                .create_function(|_, _: ()| Ok(std::process::id()))?,
        )?;

        module.set(
            "get_env",
            state
                .lua
                .create_function(|lua, name: String| match env::var(name) {
                    Ok(v) => Ok(v.into_lua(lua)?),
                    Err(_) => Ok(LuaValue::Nil),
                })?,
        )?;

        module.set(
            "current_exe",
            state
                .lua
                .create_function(|lua, _: ()| match env::current_exe() {
                    Ok(p) => Ok(p.into_lua(lua)?),
                    Err(e) => Err(LuaError::external(Arc::new(e))),
                })?,
        )?;

        module.set(
            "get_cwd",
            state
                .lua
                .create_function(|lua, _: ()| match env::current_dir() {
                    Ok(p) => Ok(p.into_lua(lua)?),
                    Err(_) => Ok(LuaValue::Nil),
                })?,
        )?;

        module.set(
            "set_cwd",
            state.lua.create_function(|_, p: PathBuf| {
                env::set_current_dir(p)?;
                Ok(())
            })?,
        )?;

        create_module(&state.lua, "autosway.os", module)?;

        Ok(())
    }
}