starship/src/module.rs

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use crate::config::SegmentConfig;
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use crate::segment::Segment;
use ansi_term::Style;
use ansi_term::{ANSIString, ANSIStrings};
use std::fmt;
// List of all modules
// Keep these ordered alphabetically.
// Default ordering is handled in configs/mod.rs
pub const ALL_MODULES: &[&str] = &[
"aws",
#[cfg(feature = "battery")]
"battery",
"character",
"cmd_duration",
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"conda",
"directory",
"dotnet",
"env_var",
"git_branch",
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"git_commit",
"git_state",
"git_status",
"golang",
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"hg_branch",
"hostname",
"java",
"jobs",
"kubernetes",
"line_break",
"memory_usage",
"nix_shell",
"nodejs",
"package",
"python",
"ruby",
"rust",
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"php",
"terraform",
"time",
"username",
];
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/// A module is a collection of segments showing data for a single integration
/// (e.g. The git module shows the current git branch and status)
pub struct Module<'a> {
/// The module's configuration map if available
pub config: Option<&'a toml::Value>,
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/// The module's name, to be used in configuration and logging.
_name: String,
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/// The styling to be inherited by all segments contained within this module.
style: Style,
/// The prefix used to separate the current module from the previous one.
prefix: Affix,
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/// The collection of segments that compose this module.
segments: Vec<Segment>,
/// The suffix used to separate the current module from the next one.
suffix: Affix,
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}
impl<'a> Module<'a> {
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/// Creates a module with no segments.
pub fn new(name: &str, config: Option<&'a toml::Value>) -> Module<'a> {
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Module {
config,
_name: name.to_string(),
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style: Style::default(),
prefix: Affix::default_prefix(name),
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segments: Vec::new(),
suffix: Affix::default_suffix(name),
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}
}
/// Get a reference to a newly created segment in the module
pub fn create_segment(&mut self, name: &str, segment_config: &SegmentConfig) -> &mut Segment {
let mut segment = Segment::new(name);
segment.set_style(segment_config.style.unwrap_or(self.style));
segment.set_value(segment_config.value);
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self.segments.push(segment);
self.segments.last_mut().unwrap()
}
/// Get module's name
pub fn get_name(&self) -> &String {
&self._name
}
/// Whether a module has non-empty segments
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pub fn is_empty(&self) -> bool {
self.segments.iter().all(|segment| segment.is_empty())
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}
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/// Get the module's prefix
pub fn get_prefix(&mut self) -> &mut Affix {
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&mut self.prefix
}
/// Get the module's suffix
pub fn get_suffix(&mut self) -> &mut Affix {
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&mut self.suffix
}
/// Sets the style of the segment.
///
/// Accepts either `Color` or `Style`.
pub fn set_style<T>(&mut self, style: T) -> &mut Module<'a>
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where
T: Into<Style>,
{
self.style = style.into();
self
}
/// Returns a vector of colored ANSIString elements to be later used with
/// `ANSIStrings()` to optimize ANSI codes
pub fn ansi_strings(&self) -> Vec<ANSIString> {
let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
let ansi_strings = self
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.segments
.iter()
.map(Segment::ansi_string)
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.collect::<Vec<ANSIString>>();
let mut ansi_strings = match shell.as_str() {
"bash" => ansi_strings_modified(ansi_strings, shell),
"zsh" => ansi_strings_modified(ansi_strings, shell),
_ => ansi_strings,
};
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ansi_strings.insert(0, self.prefix.ansi_string());
ansi_strings.push(self.suffix.ansi_string());
ansi_strings
}
pub fn to_string_without_prefix(&self) -> String {
ANSIStrings(&self.ansi_strings()[1..]).to_string()
}
}
impl<'a> fmt::Display for Module<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let ansi_strings = self.ansi_strings();
write!(f, "{}", ANSIStrings(&ansi_strings))
}
}
/// Many shells cannot deal with raw unprintable characters (like ANSI escape sequences) and
/// miscompute the cursor position as a result, leading to strange visual bugs. Here, we wrap these
/// characters in shell-specific escape codes to indicate to the shell that they are zero-length.
fn ansi_strings_modified(ansi_strings: Vec<ANSIString>, shell: String) -> Vec<ANSIString> {
const ESCAPE_BEGIN: char = '\u{1b}';
const MAYBE_ESCAPE_END: char = 'm';
ansi_strings
.iter()
.map(|ansi| {
let mut escaped = false;
let final_string: String = ansi
.to_string()
.chars()
.map(|x| match x {
ESCAPE_BEGIN => {
escaped = true;
match shell.as_str() {
"bash" => String::from("\u{5c}\u{5b}\u{1b}"), // => \[ESC
"zsh" => String::from("\u{25}\u{7b}\u{1b}"), // => %{ESC
_ => x.to_string(),
}
}
MAYBE_ESCAPE_END => {
if escaped {
escaped = false;
match shell.as_str() {
"bash" => String::from("m\u{5c}\u{5d}"), // => m\]
"zsh" => String::from("m\u{25}\u{7d}"), // => m%}
_ => x.to_string(),
}
} else {
x.to_string()
}
}
_ => x.to_string(),
})
.collect();
ANSIString::from(final_string)
})
.collect::<Vec<ANSIString>>()
}
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/// Module affixes are to be used for the prefix or suffix of a module.
pub struct Affix {
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/// The affix's name, to be used in configuration and logging.
_name: String,
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/// The affix's style.
style: Style,
/// The string value of the affix.
value: String,
}
impl Affix {
pub fn default_prefix(name: &str) -> Self {
Self {
_name: format!("{}_prefix", name),
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style: Style::default(),
value: "via ".to_string(),
}
}
pub fn default_suffix(name: &str) -> Self {
Self {
_name: format!("{}_suffix", name),
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style: Style::default(),
value: " ".to_string(),
}
}
/// Sets the style of the module.
///
/// Accepts either `Color` or `Style`.
pub fn set_style<T>(&mut self, style: T) -> &mut Self
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where
T: Into<Style>,
{
self.style = style.into();
self
}
/// Sets the value of the module.
pub fn set_value<T>(&mut self, value: T) -> &mut Self
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where
T: Into<String>,
{
self.value = value.into();
self
}
/// Generates the colored ANSIString output.
pub fn ansi_string(&self) -> ANSIString {
self.style.paint(&self.value)
}
}
impl fmt::Display for Affix {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.ansi_string())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_module_is_empty_with_no_segments() {
let name = "unit_test";
let module = Module {
config: None,
_name: name.to_string(),
style: Style::default(),
prefix: Affix::default_prefix(name),
segments: Vec::new(),
suffix: Affix::default_suffix(name),
};
assert!(module.is_empty());
}
#[test]
fn test_module_is_empty_with_all_empty_segments() {
let name = "unit_test";
let module = Module {
config: None,
_name: name.to_string(),
style: Style::default(),
prefix: Affix::default_prefix(name),
segments: vec![Segment::new("test_segment")],
suffix: Affix::default_suffix(name),
};
assert!(module.is_empty());
}
}