Struct TerminalEnv 

pub struct TerminalEnv {
    pub term: Option<String>,
    pub term_program: Option<String>,
    pub lang: Option<String>,
    pub lc_all: Option<String>,
    pub lc_ctype: Option<String>,
    pub no_unicode: Option<String>,
    pub no_rich_unicode: Option<String>,
}

Terminal environment inputs the capability probe reads.

The verdict is a pure function of this snapshot, so callers that need to evaluate a hypothetical environment can do so without mutating the process environment.

Fields

term: Option<String>

TERM — the terminal’s generic capability string.

term_program: Option<String>

TERM_PROGRAM — the terminal program’s own name.

lang: Option<String>

LANG — the primary locale.

lc_all: Option<String>

LC_ALL — the locale override.

lc_ctype: Option<String>

LC_CTYPE — the character-encoding locale.

no_unicode: Option<String>

VTCODE_NO_UNICODE — opt out of Unicode chrome.

no_rich_unicode: Option<String>

VTCODE_NO_RICH_UNICODE — opt out of the dashed box-drawing variants.

Implementations

impl TerminalEnv

pub fn capture() -> Self

Snapshot the current process environment.

pub fn no_unicode_requested(&self) -> bool

Whether the user asked for ASCII-only chrome.

Uses the repository’s canonical env-flag semantics: only an affirmative value (1, true, yes, on, debug) disables Unicode, so VTCODE_NO_UNICODE=0 leaves Unicode chrome enabled.

pub fn no_rich_unicode_requested(&self) -> bool

Whether the user asked to skip the dashed box-drawing variants.

pub fn supports_unicode_box_drawing(&self) -> bool

Whether the terminal can draw Unicode box-drawing glyphs.

TERM is authoritative because it describes the terminal program; the locale only decides the question when TERM says nothing. A UTF-8 locale is the only positive evidence left, so without one the answer stays at “no” and the terminal keeps ASCII chrome.

pub fn supports_rich_box_drawing(&self) -> bool

Whether the terminal renders the dashed box-drawing variants correctly.

TERM_PROGRAM identifies the terminal program; TERM only names it for the terminals that put their name in TERM as well.

Trait Implementations

impl Clone for TerminalEnv

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TerminalEnv

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TerminalEnv

fn default() -> Self

Returns the “default value” for a type.

impl Eq for TerminalEnv

impl PartialEq for TerminalEnv

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TerminalEnv