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// Copyright 2019 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! ncurses-compatible database discovery
//!
//! Does not support hashed database, only filesystem!
use std::env;
use std::fs;
use std::path::PathBuf;
use dirs_next as dirs;
/// Return path to database entry for `term`
pub fn get_dbpath_for_term(term: &str) -> Option<PathBuf> {
let mut dirs_to_search = Vec::new();
let first_char = match term.chars().next() {
Some(c) => c,
None => return None,
};
// Find search directory
// The terminfo manual says:
//
// > If the environment variable TERMINFO is set, it is interpreted
// > as the pathname of a directory containing the compiled description
// > you are working on. Only that directory is searched.
//
// However, the ncurses manual says:
//
// > If the environment variable TERMINFO is defined, any program using
// > curses checks for a local terminal definition before checking in
// > the standard place.
//
// Given that ncurses is the defacto standard, we follow the ncurses manual.
if let Some(dir) = env::var_os("TERMINFO") {
dirs_to_search.push(PathBuf::from(dir));
}
if let Ok(dirs) = env::var("TERMINFO_DIRS") {
for i in dirs.split(':') {
if i == "" {
dirs_to_search.push(PathBuf::from("/usr/share/terminfo"));
} else {
dirs_to_search.push(PathBuf::from(i));
}
}
} else {
// Found nothing in TERMINFO_DIRS, use the default paths:
// According to /etc/terminfo/README, after looking at
// ~/.terminfo, ncurses will search /etc/terminfo, then
// /lib/terminfo, and eventually /usr/share/terminfo.
// On Haiku the database can be found at /boot/system/data/terminfo
if let Some(mut homedir) = dirs::home_dir() {
homedir.push(".terminfo");
dirs_to_search.push(homedir)
}
dirs_to_search.push(PathBuf::from("/etc/terminfo"));
dirs_to_search.push(PathBuf::from("/lib/terminfo"));
dirs_to_search.push(PathBuf::from("/usr/share/terminfo"));
dirs_to_search.push(PathBuf::from("/boot/system/data/terminfo"));
}
// Look for the terminal in all of the search directories
for mut p in dirs_to_search {
if fs::metadata(&p).is_ok() {
p.push(&first_char.to_string());
p.push(&term);
if fs::metadata(&p).is_ok() {
return Some(p);
}
p.pop();
p.pop();
// on some installations the dir is named after the hex of the char
// (e.g. OS X)
p.push(&format!("{:x}", first_char as usize));
p.push(term);
if fs::metadata(&p).is_ok() {
return Some(p);
}
}
}
None
}
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