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1 | // Copyright 2019 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | //! ncurses-compatible database discovery | |
12 | //! | |
13 | //! Does not support hashed database, only filesystem! | |
14 | ||
15 | use std::env; | |
16 | use std::fs; | |
17 | use std::path::PathBuf; | |
18 | ||
19 | use dirs_next as dirs; | |
20 | ||
21 | /// Return path to database entry for `term` | |
22 | pub fn get_dbpath_for_term(term: &str) -> Option<PathBuf> { | |
23 | let mut dirs_to_search = Vec::new(); | |
24 | let first_char = match term.chars().next() { | |
25 | Some(c) => c, | |
26 | None => return None, | |
27 | }; | |
28 | ||
29 | // Find search directory | |
30 | // The terminfo manual says: | |
31 | // | |
32 | // > If the environment variable TERMINFO is set, it is interpreted | |
33 | // > as the pathname of a directory containing the compiled description | |
34 | // > you are working on. Only that directory is searched. | |
35 | // | |
36 | // However, the ncurses manual says: | |
37 | // | |
38 | // > If the environment variable TERMINFO is defined, any program using | |
39 | // > curses checks for a local terminal definition before checking in | |
40 | // > the standard place. | |
41 | // | |
42 | // Given that ncurses is the defacto standard, we follow the ncurses manual. | |
43 | if let Some(dir) = env::var_os("TERMINFO") { | |
44 | dirs_to_search.push(PathBuf::from(dir)); | |
45 | } | |
46 | ||
47 | if let Ok(dirs) = env::var("TERMINFO_DIRS") { | |
48 | for i in dirs.split(':') { | |
49 | if i == "" { | |
50 | dirs_to_search.push(PathBuf::from("/usr/share/terminfo")); | |
51 | } else { | |
52 | dirs_to_search.push(PathBuf::from(i)); | |
53 | } | |
54 | } | |
55 | } else { | |
56 | // Found nothing in TERMINFO_DIRS, use the default paths: | |
57 | // According to /etc/terminfo/README, after looking at | |
58 | // ~/.terminfo, ncurses will search /etc/terminfo, then | |
59 | // /lib/terminfo, and eventually /usr/share/terminfo. | |
60 | // On Haiku the database can be found at /boot/system/data/terminfo | |
61 | if let Some(mut homedir) = dirs::home_dir() { | |
62 | homedir.push(".terminfo"); | |
63 | dirs_to_search.push(homedir) | |
64 | } | |
65 | ||
66 | dirs_to_search.push(PathBuf::from("/etc/terminfo")); | |
67 | dirs_to_search.push(PathBuf::from("/lib/terminfo")); | |
68 | dirs_to_search.push(PathBuf::from("/usr/share/terminfo")); | |
69 | dirs_to_search.push(PathBuf::from("/boot/system/data/terminfo")); | |
70 | } | |
71 | ||
72 | // Look for the terminal in all of the search directories | |
73 | for mut p in dirs_to_search { | |
74 | if fs::metadata(&p).is_ok() { | |
75 | p.push(&first_char.to_string()); | |
76 | p.push(&term); | |
77 | if fs::metadata(&p).is_ok() { | |
78 | return Some(p); | |
79 | } | |
80 | p.pop(); | |
81 | p.pop(); | |
82 | ||
83 | // on some installations the dir is named after the hex of the char | |
84 | // (e.g. OS X) | |
85 | p.push(&format!("{:x}", first_char as usize)); | |
86 | p.push(term); | |
87 | if fs::metadata(&p).is_ok() { | |
88 | return Some(p); | |
89 | } | |
90 | } | |
91 | } | |
92 | None | |
93 | } |