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use std::io::Stdout;
use std::io::Write;
use std::ops::Deref;
use librepology::v1::types::Name;
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 ListFrontend(Stdout);
/// A Frontend that prints the data in a human-readable way but without ASCII-art.
///
/// It seperates the values with dashes ("-") for a slightly better reading experience.
impl ListFrontend {
pub fn new(stdout: Stdout) -> Self {
ListFrontend(stdout)
}
}
impl Frontend for ListFrontend {
fn list_packages(&self, packages: Vec<Package>) -> Result<()> {
let mut outlock = self.0.lock();
packages.iter().fold(Ok(()), |accu, package| {
accu.and_then(|_| {
let status= if let Some(stat) = package.status() {
stat.deref().to_string()
} else {
String::from("No status")
}; // not optimal, but works for now.
let url= if let Some(url) = package.www() {
if let Some(url) = url.first() {
url.deref().to_string()
} else {
String::from("")
}
} else {
String::from("")
}; // not optimal, but works for now
writeln!(outlock,
"{name:10} - {version:8} - {repo:15} - {status:5} - {www}",
name = package.any_name().map(Name::deref).map(String::deref).unwrap_or_else(|| "<unknown>"),
version = package.version().deref(),
repo = package.repo().deref(),
status = status,
www = url).map(|_| ()).map_err(Error::from)
})
})
}
fn list_problems(&self, problems: Vec<Problem>) -> Result<()> {
let mut outlock = self.0.lock();
problems.iter().fold(Ok(()), |accu, problem| {
accu.and_then(|_| {
writeln!(outlock,
"{repo:10} - {name:10} - {effname:10} - {maintainer:15} - {desc}",
repo = problem.repo().deref(),
name = problem.name().deref(),
effname = problem.effname().deref(),
maintainer = problem.maintainer().deref(),
desc = problem.problem_description())
.map(|_| ())
.map_err(Error::from)
})
})
}
fn compare_packages(&self, packages: Vec<ComparePackage>, backend: &Backend, filter_repos: Vec<Repo>) -> Result<()> {
let mut output = self.0.lock();
for package in packages {
backend
.project(package.name().deref())?
.into_iter()
.filter(|p| filter_repos.contains(p.repo()))
.map(|upstream_package| {
writeln!(output,
"{our_package_name} - {our_package_version} - {up_repo_name} - {up_package_version}",
our_package_name = package.name().deref(),
our_package_version = package.version().deref(),
up_repo_name = upstream_package.repo().deref(),
up_package_version = upstream_package.version().deref()
).map_err(Error::from)
})
.collect::<Result<Vec<()>>>()?;
}
Ok(())
}
}
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