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/// Implement ncurses-compatible database discovery
/// Does not support hashed database, only filesystem!
use std::os;
use std::os::getenv;
use std::str;
use std::io::{file_reader, Reader};
use path = std::path::PosixPath;
/// Return path to database entry for `term`
pub fn get_dbpath_for_term(term: &str) -> Option<~path> {
if term.len() == 0 {
return None;
}
let homedir = os::homedir();
let mut dirs_to_search = ~[];
let first_char = term.substr(0, 1);
// Find search directory
match getenv("TERMINFO") {
Some(dir) => dirs_to_search.push(path(dir)),
None => {
if homedir.is_some() {
dirs_to_search.push(homedir.unwrap().push(".terminfo")); // ncurses compatability
}
match getenv("TERMINFO_DIRS") {
Some(dirs) => for str::each_split_char(dirs, ':') |i| {
if i == "" {
dirs_to_search.push(path("/usr/share/terminfo"));
} else {
dirs_to_search.push(path(i.to_owned()));
}
},
// Found nothing, use the default path
None => dirs_to_search.push(path("/usr/share/terminfo"))
}
}
};
// Look for the terminal in all of the search directories
for dirs_to_search.each |p| {
let newp = ~p.push_many(&[first_char.to_owned(), term.to_owned()]);
if os::path_exists(p) && os::path_exists(newp) {
return Some(newp);
}
}
None
}
/// Return open file for `term`
pub fn open(term: &str) -> Result<@Reader, ~str> {
match get_dbpath_for_term(term) {
Some(x) => file_reader(x),
None => Err(fmt!("could not find terminfo entry for %s", term))
}
}
#[test]
fn test_get_dbpath_for_term() {
// woefully inadequate test coverage
use std::os::{setenv, unsetenv};
fn x(t: &str) -> ~str { get_dbpath_for_term(t).expect("no terminfo entry found").to_str() };
assert!(x("screen") == ~"/usr/share/terminfo/s/screen");
assert!(get_dbpath_for_term("") == None);
setenv("TERMINFO_DIRS", ":");
assert!(x("screen") == ~"/usr/share/terminfo/s/screen");
unsetenv("TERMINFO_DIRS");
}
#[test]
fn test_open() {
open("screen");
let t = open("nonexistent terminal that hopefully does not exist");
assert!(t.is_err());
}
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