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use super::Segment;
use crate::context::Context;
use ansi_term::Color;
use std::path::PathBuf;
use std::process::Command;
/// Creates a segment with the current Python version
///
/// Will display the Python version if any of the following criteria are met:
/// - Current directory contains a `.py` file
/// - Current directory contains a `.python-version` file
/// - Current directory contains a `requirements.txt` file
/// - Current directory contains a `pyproject.toml` file
pub fn segment(context: &Context) -> Option<Segment> {
let is_py_project = context.dir_files.iter().any(has_py_files);
if !is_py_project {
return None;
}
match get_python_version() {
Some(python_version) => {
const PYTHON_CHAR: &str = "🐍";
const SEGMENT_COLOR: Color = Color::Yellow;
let mut segment = Segment::new("python");
segment.set_style(SEGMENT_COLOR);
let formatted_version = format_python_version(python_version);
segment.set_value(format!("{} {}", PYTHON_CHAR, formatted_version));
Some(segment)
}
None => None,
}
}
fn has_py_files(dir_entry: &PathBuf) -> bool {
let is_py_file =
|d: &PathBuf| -> bool { d.is_file() && d.extension().unwrap_or_default() == "py" };
let is_python_version = |d: &PathBuf| -> bool {
d.is_file() && d.file_name().unwrap_or_default() == ".python-version"
};
let is_requirements_txt = |d: &PathBuf| -> bool {
d.is_file() && d.file_name().unwrap_or_default() == "requirements.txt"
};
let is_py_project = |d: &PathBuf| -> bool {
d.is_file() && d.file_name().unwrap_or_default() == "pyproject.toml"
};
is_py_file(&dir_entry)
|| is_python_version(&dir_entry)
|| is_requirements_txt(&dir_entry)
|| is_py_project(&dir_entry)
}
fn get_python_version() -> Option<String> {
match Command::new("python").arg("--version").output() {
Ok(output) => Some(String::from_utf8(output.stdout).unwrap()),
Err(_) => None,
}
}
fn format_python_version(python_stdout: String) -> String {
format!("v{}", python_stdout.trim_start_matches("Python ").trim())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_format_python_version() {
let input = String::from("Python 3.7.2");
assert_eq!(format_python_version(input), "v3.7.2");
}
}
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