71 lines
2.8 KiB
Rust
71 lines
2.8 KiB
Rust
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//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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use runtime::Runtime;
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use clap::App;
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use failure::Fallible as Result;
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pub trait ImagApplication {
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fn run(rt: Runtime) -> Result<()>;
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fn build_cli<'a>(app: App<'a, 'a>) -> App<'a, 'a>;
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fn name() -> &'static str;
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fn version() -> &'static str;
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fn description() -> &'static str;
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}
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#[macro_export]
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macro_rules! simple_imag_application_binary {
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($application_library:ident, $application_implementor:ident) => {
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extern crate libimagerror;
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extern crate failure;
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extern crate $application_library;
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use failure::{Error, Fallible as Result};
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fn main() {
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use libimagerror::trace::MapErrTrace;
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use libimagrt::application::ImagApplication;
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use libimagrt::setup::generate_runtime_setup;
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use $application_library::$application_implementor;
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let version = make_imag_version!();
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let rt = generate_runtime_setup($application_implementor::name(),
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&version,
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$application_implementor::description(),
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$application_implementor::build_cli);
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// The error context must have a 'static lifetime
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// Therefore, the easiest, safe, but hacky way to achieve this
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// is to allocate a string, which is then forgotten to
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// leak memory and return it's contents as a &'static str
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// Because this is the very end of the application and only
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// happens once, it should have no impact whatsoever
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let error_context: &'static str = Box::leak(
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format!("Failed to run {}", $application_implementor::name())
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.into_boxed_str()
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);
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$application_implementor::run(rt)
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.map_err(|e| e.context(error_context))
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.map_err(Error::from)
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.map_err_trace_exit_unwrap();
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}
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};
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}
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