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use {
anyhow::{Context, Result},
mailparse::parse_mail,
};
pub struct PythonPackageMetadata {
headers: Vec<(String, String)>,
}
impl PythonPackageMetadata {
pub fn from_metadata(data: &[u8]) -> Result<PythonPackageMetadata> {
let message = parse_mail(data).context("parsing metadata file")?;
let headers = message
.headers
.iter()
.map(|header| (header.get_key(), header.get_value()))
.collect::<Vec<_>>();
Ok(PythonPackageMetadata { headers })
}
pub fn find_first_header(&self, key: &str) -> Option<&str> {
for (k, v) in &self.headers {
if k == key {
return Some(v);
}
}
None
}
#[allow(unused)]
pub fn find_all_headers(&self, key: &str) -> Vec<&str> {
self.headers
.iter()
.filter_map(|(k, v)| if k == key { Some(v.as_ref()) } else { None })
.collect::<Vec<_>>()
}
pub fn name(&self) -> Option<&str> {
self.find_first_header("Name")
}
pub fn version(&self) -> Option<&str> {
self.find_first_header("Version")
}
#[allow(unused)]
pub fn license(&self) -> Option<&str> {
self.find_first_header("License")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_metadata() -> Result<()> {
let data = concat!(
"Metadata-Version: 2.1\n",
"Name: black\n",
"Version: 19.10b0\n",
"Summary: The uncompromising code formatter.\n",
"Home-page: https://github.com/psf/black\n",
"Author: Łukasz Langa\n",
"Author-email: lukasz@langa.pl\n",
"License: MIT\n",
"Requires-Dist: click (>=6.5)\n",
"Requires-Dist: attrs (>=18.1.0)\n",
"Requires-Dist: appdirs\n",
"\n",
"![Black Logo](https://raw.githubusercontent.com/psf/black/master/docs/_static/logo2-readme.png)\n",
"\n",
"<h2 align=\"center\">The Uncompromising Code Formatter</h2>\n",
).as_bytes();
let m = PythonPackageMetadata::from_metadata(data)?;
assert_eq!(m.name(), Some("black"));
assert_eq!(m.version(), Some("19.10b0"));
assert_eq!(m.license(), Some("MIT"));
assert_eq!(
m.find_all_headers("Requires-Dist"),
vec!["click (>=6.5)", "attrs (>=18.1.0)", "appdirs"]
);
assert_eq!(m.find_first_header("Missing"), None);
Ok(())
}
}