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use std::env;
use std::path::Path;
use std::process::Command;
use ansi_term::Color;
use super::{Context, Module};
/// Creates a module with the current Python version
///
/// Will display the Python version if any of the following criteria are met:
/// - Current directory contains a `.python-version` file
/// - Current directory contains a `requirements.txt` file
/// - Current directory contains a `pyproject.toml` file
/// - Current directory contains a file with the `.py` extension
/// - Current directory contains a `Pipfile` file
/// - Current directory contains a `tox.ini` file
pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
let is_py_project = context
.try_begin_scan()?
.set_files(&[
"requirements.txt",
".python-version",
"pyproject.toml",
"Pipfile",
"tox.ini",
])
.set_extensions(&["py"])
.is_match();
if !is_py_project {
return None;
}
let mut module = context.new_module("python");
let pyenv_version_name = module
.config_value_bool("pyenv_version_name")
.unwrap_or(false);
const PYTHON_CHAR: &str = "🐍 ";
let module_color = module
.config_value_style("style")
.unwrap_or_else(|| Color::Yellow.bold());
module.set_style(module_color);
module.new_segment("symbol", PYTHON_CHAR);
select_python_version(pyenv_version_name)
.map(|python_version| python_module(module, pyenv_version_name, python_version))
}
fn python_module(mut module: Module, pyenv_version_name: bool, python_version: String) -> Module {
const PYENV_PREFIX: &str = "pyenv ";
if pyenv_version_name {
module.new_segment("pyenv_prefix", PYENV_PREFIX);
module.new_segment("version", &python_version.trim());
} else {
let formatted_version = format_python_version(&python_version);
module.new_segment("version", &formatted_version);
get_python_virtual_env()
.map(|virtual_env| module.new_segment("virtualenv", &format!("({})", virtual_env)));
};
module
}
fn select_python_version(pyenv_version_name: bool) -> Option<String> {
if pyenv_version_name {
get_pyenv_version()
} else {
get_python_version()
}
}
fn get_pyenv_version() -> Option<String> {
Command::new("pyenv")
.arg("version-name")
.output()
.ok()
.and_then(|output| String::from_utf8(output.stdout).ok())
}
fn get_python_version() -> Option<String> {
match Command::new("python").arg("--version").output() {
Ok(output) => {
// We have to check both stdout and stderr since for Python versions
// < 3.4, Python reports to stderr and for Python version >= 3.5,
// Python reports to stdout
if output.stdout.is_empty() {
let stderr_string = String::from_utf8(output.stderr).unwrap();
Some(stderr_string)
} else {
let stdout_string = String::from_utf8(output.stdout).unwrap();
Some(stdout_string)
}
}
Err(_) => None,
}
}
fn format_python_version(python_stdout: &str) -> String {
format!("v{}", python_stdout.trim_start_matches("Python ").trim())
}
fn get_python_virtual_env() -> Option<String> {
env::var("VIRTUAL_ENV").ok().and_then(|venv| {
Path::new(&venv)
.file_name()
.map(|filename| String::from(filename.to_str().unwrap_or("")))
})
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_format_python_version() {
let input = "Python 3.7.2";
assert_eq!(format_python_version(input), "v3.7.2");
}
}
|
