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use std::env;
const COLORTERM: &str = "COLORTERM";
const BAT_THEME: &str = "BAT_THEME";
const GIT_CONFIG_PARAMETERS: &str = "GIT_CONFIG_PARAMETERS";
const GIT_PREFIX: &str = "GIT_PREFIX";
const DELTA_FEATURES: &str = "DELTA_FEATURES";
const DELTA_NAVIGATE: &str = "DELTA_NAVIGATE";
const DELTA_EXPERIMENTAL_MAX_LINE_DISTANCE_FOR_NAIVELY_PAIRED_LINES: &str =
"DELTA_EXPERIMENTAL_MAX_LINE_DISTANCE_FOR_NAIVELY_PAIRED_LINES";
const DELTA_PAGER: &str = "DELTA_PAGER";
const BAT_PAGER: &str = "BAT_PAGER";
const PAGER: &str = "PAGER";
#[derive(Default, Clone)]
pub struct DeltaEnv {
pub bat_theme: Option<String>,
pub colorterm: Option<String>,
pub current_dir: Option<std::path::PathBuf>,
pub experimental_max_line_distance_for_naively_paired_lines: Option<String>,
pub features: Option<String>,
pub git_config_parameters: Option<String>,
pub git_prefix: Option<String>,
pub navigate: Option<String>,
pub pagers: (Option<String>, Option<String>, Option<String>),
}
impl DeltaEnv {
/// Create a structure with current environment variable
pub fn init() -> Self {
let bat_theme = env_var(BAT_THEME);
let colorterm = env_var(COLORTERM);
let experimental_max_line_distance_for_naively_paired_lines =
env_var(DELTA_EXPERIMENTAL_MAX_LINE_DISTANCE_FOR_NAIVELY_PAIRED_LINES);
let features = env_var(DELTA_FEATURES);
let git_config_parameters = env_var(GIT_CONFIG_PARAMETERS);
let git_prefix = env_var(GIT_PREFIX);
let navigate = env_var(DELTA_NAVIGATE);
let current_dir = env::current_dir().ok();
let pagers = (env_var(DELTA_PAGER), env_var(BAT_PAGER), env_var(PAGER));
Self {
bat_theme,
colorterm,
current_dir,
experimental_max_line_distance_for_naively_paired_lines,
features,
git_config_parameters,
git_prefix,
navigate,
pagers,
}
}
}
/// If `name` is set and, after trimming whitespace, is not empty string, then return that trimmed
/// string. Else None.
fn env_var(name: &str) -> Option<String> {
match env::var(name).unwrap_or_else(|_| "".to_string()).trim() {
"" => None,
s => Some(s.to_string()),
}
}
#[cfg(test)]
pub mod tests {
use super::DeltaEnv;
use std::env;
#[test]
fn test_env_parsing() {
let feature = "Awesome Feature";
env::set_var("DELTA_FEATURES", feature);
let env = DeltaEnv::init();
assert_eq!(env.features, Some(feature.into()));
}
}
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