library/test/src/term/terminfo/searcher.rs

   1 //! ncurses-compatible database discovery.
   2 //!
   3 //! Does not support hashed database, only filesystem!
   4
   5 use std::env;
   6 use std::fs;
   7 use std::path::PathBuf;
   8
   9 #[cfg(test)]
  10 mod tests;
  11
  12 /// Return path to database entry for `term`
  13 #[allow(deprecated)]
  14 pub(crate) fn get_dbpath_for_term(term: &str) -> Option<PathBuf> {
  15     let mut dirs_to_search = Vec::new();
  16     let first_char = term.chars().next()?;
  17
  18     // Find search directory
  19     if let Some(dir) = env::var_os("TERMINFO") {
  20         dirs_to_search.push(PathBuf::from(dir));
  21     }
  22
  23     if let Ok(dirs) = env::var("TERMINFO_DIRS") {
  24         for i in dirs.split(':') {
  25             if i.is_empty() {
  26                 dirs_to_search.push(PathBuf::from("/usr/share/terminfo"));
  27             } else {
  28                 dirs_to_search.push(PathBuf::from(i));
  29             }
  30         }
  31     } else {
  32         // Found nothing in TERMINFO_DIRS, use the default paths:
  33         // According to  /etc/terminfo/README, after looking at
  34         // ~/.terminfo, ncurses will search /etc/terminfo, then
  35         // /lib/terminfo, and eventually /usr/share/terminfo.
  36         // On Haiku the database can be found at /boot/system/data/terminfo
  37         if let Some(mut homedir) = env::home_dir() {
  38             homedir.push(".terminfo");
  39             dirs_to_search.push(homedir)
  40         }
  41
  42         dirs_to_search.push(PathBuf::from("/etc/terminfo"));
  43         dirs_to_search.push(PathBuf::from("/lib/terminfo"));
  44         dirs_to_search.push(PathBuf::from("/usr/share/terminfo"));
  45         dirs_to_search.push(PathBuf::from("/boot/system/data/terminfo"));
  46     }
  47
  48     // Look for the terminal in all of the search directories
  49     for mut p in dirs_to_search {
  50         if fs::metadata(&p).is_ok() {
  51             p.push(&first_char.to_string());
  52             p.push(term);
  53             if fs::metadata(&p).is_ok() {
  54                 return Some(p);
  55             }
  56             p.pop();
  57             p.pop();
  58
  59             // on some installations the dir is named after the hex of the char
  60             // (e.g., macOS)
  61             p.push(&format!("{:x}", first_char as usize));
  62             p.push(term);
  63             if fs::metadata(&p).is_ok() {
  64                 return Some(p);
  65             }
  66         }
  67     }
  68     None
  69 }