import option;
import std::generic_os::getenv;
import std::io;

import common::config;

fn make_new_path(path: str) -> str {

    // Windows just uses PATH as the library search path, so we have to
    // maintain the current value while adding our own
    alt getenv(lib_path_env_var()) {
      option::some(curr) {
        #fmt["%s%s%s", path, path_div(), curr]
      }
      option::none. { path }
    }
}

#[cfg(target_os = "linux")]
fn lib_path_env_var() -> str { "LD_LIBRARY_PATH" }

#[cfg(target_os = "macos")]
fn lib_path_env_var() -> str { "DYLD_LIBRARY_PATH" }

#[cfg(target_os = "win32")]
fn lib_path_env_var() -> str { "PATH" }

#[cfg(target_os = "linux")]
#[cfg(target_os = "macos")]
fn path_div() -> str { ":" }

#[cfg(target_os = "win32")]
fn path_div() -> str { ";" }

fn logv(config: config, s: str) {
    log(debug, s);
    if config.verbose { io::stdout().write_line(s); }
}