Process Arguments

Iterates process.argv() to print each entry, then defines user_args() which finds the position after the .zolo file and returns only the user arguments. Run with zolo run 01-process-args.zolo foo bar to see the five entries.

// Feature: command-line arguments — `process.argv()`

// Syntax: `process.argv()` returns the full OS list (interpreter,

// `run`, script, then the user args).

// When to use: small CLI scripts; for structured flag/argument parsing,

// use `@cli` (category 12-decorators) or `Cli.__user_argv()`.


use std::Cli
use std::process

let all = process.argv()
print("argv has {all.len()} entries:")
for arg in all {
  print("  {arg}")
}

// expected when invoked as `zolo run script.zolo foo bar`:

//   argv has 5 entries:

//     <path>/zolo.exe

//     run

//     script.zolo

//     foo

//     bar


// To get only the user args, skip past the `.zolo` entry.

fn user_args() -> [str] {
  let raw = process.argv()
  var start = 0
  for i in 0..raw.len() {
    let s = raw[i]
    // `.sub(-5)` takes the last 5 chars; in Zolo, strings have a `.sub` method.

    if s.sub(-5) == ".zolo" {
      start = i + 1
      break
    }
  }
  var out: [str] = []
  for i in start..raw.len() {
    out.push(raw[i])
  }
  return out
}

let user = user_args()
print("user args: {user.len()}")
for a in user {
  print("  {a}")
}

Requires the Zolo CLI/host — open in the playground or run locally.