harn-stdlib 0.10.118

Embedded Harn standard library source catalog
Documentation 
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import { shell_quote } from "std/runtime"

/**
 * argv_label renders argv parts as the same stable space-separated label used in step records.
 *
 * @effects: []
 * @errors: []
 */
pub fn argv_label_impl(argv: list) -> string {
  return join((argv ?? []).map({ arg -> to_string(arg) }), " ")
}

fn __command_shell_flag_invokes_script(flag: string) -> bool {
  return flag == "-lc" || flag == "-c" || flag == "lc" || flag == "c"
}

fn __command_shell_accepts_script_flag(shell: string) -> bool {
  return shell == "bash"
    || shell.ends_with("/bash")
    || shell == "sh"
    || shell.ends_with("/sh")
    || shell == "zsh"
    || shell.ends_with("/zsh")
}

/**
 * shell_command_from_argv renders argv as shell text without corrupting
 * whitespace or quotes. Shell wrapper argv such as ["bash", "-lc", "cmd"]
 * returns the script payload; all other argv items are shell-quoted.
 *
 * @effects: []
 * @errors: []
 */
pub fn shell_command_from_argv_impl(argv: list) -> string {
  const values = argv ?? []
  if len(values) >= 3 {
    const shell = to_string(values[0] ?? "").trim()
    const flag = to_string(values[1] ?? "").trim()
    if __command_shell_accepts_script_flag(shell) && __command_shell_flag_invokes_script(flag) {
      return to_string(values[2] ?? "").trim()
    }
  }
  return join(values.map({ arg -> shell_quote(arg) }), " ").trim()
}

fn __command_shell_command_from_field(value: any) {
  if type_of(value) == "string" {
    return to_string(value ?? "").trim()
  }
  if type_of(value) == "list" {
    return shell_command_from_argv_impl(value)
  }
  return nil
}

/**
 * shell_command_from_value normalizes a provider-style command value. Strings
 * pass through trimmed; argv lists use shell_command_from_argv; dict values
 * accept `argv`, `command`, or `cmd` fields in either string or list form.
 *
 * @effects: []
 * @errors: []
 */
pub fn shell_command_from_value_impl(value: string | list<string> | dict) -> string {
  const direct = __command_shell_command_from_field(value)
  if direct != nil {
    return direct
  }
  if type_of(value) == "dict" {
    return __command_shell_command_from_field(value?.argv)
      ?? __command_shell_command_from_field(value?.command)
      ?? __command_shell_command_from_field(value?.cmd)
      ?? ""
  }
  return ""
}