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use std::io::Stdout;
use std::io::Write;
use std::ops::Deref;
use librepology::v1::types::Package;
use librepology::v1::types::Problem;
use librepology::v1::types::Repo;
use failure::Fallible as Result;
use failure::Error;
use crate::frontend::Frontend;
use crate::backend::Backend;
use crate::compare::ComparePackage;
use librepology::v1::api::Api;
pub struct JsonFrontend(Stdout);
/// A Frontend that serializes the data to JSON
///
/// Useful for piping the data as structured data to another program.
///
/// # Warning
///
/// This frontend does _not_ maintain compatibility with repolocli itself. That means that piping
/// output from repolocli to repolocli is _NOT_ supported by this frontend.
///
impl JsonFrontend {
pub fn new(stdout: Stdout) -> Self {
JsonFrontend(stdout)
}
fn write(&self, output: String) -> Result<()> {
let mut outlock = self.0.lock();
writeln!(outlock, "{}", output).map_err(Error::from)
}
}
impl Frontend for JsonFrontend {
fn list_packages(&self, packages: Vec<Package>) -> Result<()> {
self.write(serde_json::ser::to_string_pretty(&packages).map_err(Error::from)?)
}
fn list_problems(&self, problems: Vec<Problem>) -> Result<()> {
self.write(serde_json::ser::to_string_pretty(&problems).map_err(Error::from)?)
}
fn compare_packages(&self, packages: Vec<ComparePackage>, backend: &Backend, filter_repos: Vec<Repo>) -> Result<()> {
#[derive(Serialize)]
struct PackageComp {
// not optimal, as we have to clone the inner variables from the package
// but using references is too complicated right now
package_name: String,
local_version: String,
comparisons: Vec<CompareTarget>,
}
#[derive(Serialize)]
struct CompareTarget {
version: String,
repo: String,
}
let mut output: Vec<PackageComp> = vec![];
for package in packages.iter() {
let comparisons = backend
.project(package.name().deref())?
.into_iter()
.filter(|p| filter_repos.contains(p.repo()))
.map(|upstream_package| CompareTarget {
version: upstream_package.version().deref().clone(),
repo: upstream_package.repo().deref().clone(),
})
.collect();
output.push(PackageComp {
package_name: package.name().clone(),
local_version: package.version().clone(),
comparisons,
});
}
self.write(serde_json::ser::to_string_pretty(&output)?)
}
}
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