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termwiz: avoid file io when terminfo db is pre-filled

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ProbeHints would unconditionally load the terminfo based on $TERM
whever it was created, even if the caller had a pre-supplied
terminfo buffer.

Defer loading that until the caps instance is created.

refs: #817
This commit is contained in:
Wez Furlong 2021-06-13 07:52:14 -07:00
parent c036a7864b
commit d1d7def1a1
1 changed files with 14 additions and 5 deletions
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19
termwiz/src/caps/mod.rs
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@ -118,7 +118,6 @@ impl ProbeHints {
.colorterm_bce(var("COLORTERM_BCE").ok())
.term_program(var("TERM_PROGRAM").ok())
.term_program_version(var("TERM_PROGRAM_VERSION").ok())
.terminfo_db(terminfo::Database::from_env().ok())
}
}
@ -184,6 +183,17 @@ impl Capabilities {
/// Build a `Capabilities` object based on the provided `ProbeHints` object.
pub fn new_with_hints(hints: ProbeHints) -> Result<Self> {
let terminfo_db = hints.terminfo_db.as_ref().cloned();
let terminfo_db = if cfg!(test) {
// Don't load from the system terminfo in tests, as it is unpredictable
terminfo_db
} else {
terminfo_db.or_else(|| match hints.term.as_ref() {
Some(t) => terminfo::Database::from_name(t).ok(),
None => terminfo::Database::from_env().ok(),
})
};
let color_level = hints.color_level.unwrap_or_else(|| {
// If set, COLORTERM overrides any other source of information
match hints.colorterm.as_ref().map(String::as_ref) {
@ -191,7 +201,7 @@ impl Capabilities {
Some(_) => ColorLevel::TwoFiftySix,
_ => {
// COLORTERM isn't set, so look at the terminfo.
if let Some(ref db) = hints.terminfo_db.as_ref() {
if let Some(ref db) = terminfo_db.as_ref() {
let has_true_color = db
.get::<cap::TrueColor>()
.unwrap_or(cap::TrueColor(false))
@ -238,8 +248,7 @@ impl Capabilities {
Some("1") => true,
_ => {
// Look it up from terminfo
hints
.terminfo_db
terminfo_db
.as_ref()
.map(|db| {
db.get::<cap::BackColorErase>()
@ -279,7 +288,7 @@ impl Capabilities {
hyperlinks,
iterm2_image,
bce,
terminfo_db: hints.terminfo_db,
terminfo_db,
bracketed_paste,
mouse_reporting,
})