Files and Environment

The stdlib provides two filesystem types:

• File
• Dir

File is used for reading and writing files.

let mut file := try File.open_read("input.txt") : e => {
  panic(e);
};

let text := try file.read_all(100000) => panic("Failed to read file.");
print(text);

Important File functions and methods include:

• File.open(...)
• File.open_read(...)
• File.open_write(...)
• File.open_append(...)
• .close()
• .flush()
• .write(...)
• .write_line(...)
• .read_line(...)
• .read_lines(...)
• .read_all(...)
• File.read_to_string(...)
• File.read_lines_path(...)
• File.exists(...)
• File.remove(...)

Dir is used for directory-oriented operations.

let dir := Dir.new("tmp");
let _ := dir.ensure();
print(dir.exists());

Important Dir methods include:

• Dir.new(...)
• .exists()
• .create()
• .remove()
• .ensure()
• .scan()

The stdlib also provides environment types:

• Args
• Vars

Args reads command-line arguments.

print(Args.first());
print(Args.count());
print(Args.all());

Vars reads and writes environment variables.

print(Vars.get("HOME"));
print(Vars.has("PATH"));
Vars.set("APP_MODE", "dev");
Vars.remove("APP_MODE");