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use std::env;
use std::path::Path;
use std::process::Command;
use super::{Context, Module, RootModuleConfig, SegmentConfig};
use crate::configs::python::PythonConfig;
/// 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 config: PythonConfig = PythonConfig::try_load(module.config);
module.set_style(config.style);
module.create_segment("symbol", &config.symbol);
if config.pyenv_version_name {
let python_version = get_pyenv_version()?;
module.create_segment("pyenv_prefix", &config.pyenv_prefix);
module.create_segment("version", &SegmentConfig::new(&python_version.trim()));
} else {
let python_version = get_python_version()?;
let formatted_version = format_python_version(&python_version);
module.create_segment("version", &SegmentConfig::new(&formatted_version));
if let Some(virtual_env) = get_python_virtual_env() {
module.create_segment(
"virtualenv",
&SegmentConfig::new(&format!(" ({})", virtual_env)),
);
};
};
Some(module)
}
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) => {
if !output.status.success() {
log::warn!(
"Non-Zero exit code '{}' when executing `python --version`",
output.status
);
return None;
}
// 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");
}
}
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