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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use error::InteractionError as IE;
use error::InteractionErrorKind as IEK;
use error::ResultExt;
use toml::Value;
use rustyline::{Config, Editor};
pub struct Readline {
editor: Editor,
history_file: PathBuf,
prompt: String,
}
impl Readline {
pub fn new(rt: &Runtime) -> Result<Readline> {
let cfg = try!(rt.config().ok_or(IEK::NoConfigError));
let c = cfg.config();
let histfile = try!(c.lookup("ui.cli.readline_history_file").ok_or(IEK::ConfigError));
let histsize = try!(c.lookup("ui.cli.readline_history_size").ok_or(IEK::ConfigError));
let histigndups = try!(c.lookup("ui.cli.readline_history_ignore_dups").ok_or(IEK::ConfigError));
let histignspace = try!(c.lookup("ui.cli.readline_history_ignore_space").ok_or(IEK::ConfigError));
let prompt = try!(c.lookup("ui.cli.readline_prompt").ok_or(IEK::ConfigError));
let histfile = try!(match histfile {
Value::String(s) => PathBuf::from(s),
_ => Err(IE::from_kind(IEK::ConfigTypeError))
.chain_err(|| IEK::ConfigError)
.chain_err(|| IEK::ReadlineError)
});
let histsize = try!(match histsize {
Value::Integer(i) => i,
_ => Err(IE::from_kind(IEK::ConfigTypeError))
.chain_err(|| IEK::ConfigError)
.chain_err(|| IEK::ReadlineError)
});
let histigndups = try!(match histigndups {
Value::Boolean(b) => b,
_ => Err(IE::from_kind(IEK::ConfigTypeError))
.chain_err(|| IEK::ConfigError)
.chain_err(|| IEK::ReadlineError)
});
let histignspace = try!(match histignspace {
Value::Boolean(b) => b,
_ => Err(IE::from_kind(IEK::ConfigTypeError))
.chain_err(|| IEK::ConfigError)
.chain_err(|| IEK::ReadlineError)
});
let prompt = try!(match prompt {
Value::String(s) => s,
_ => Err(IE::from_kind(IEK::ConfigTypeError))
.chain_err(|| IEK::ConfigError)
.chain_err(|| IEK::ReadlineError)
});
let config = Config::builder().
.max_history_size(histsize)
.history_ignore_dups(histigndups)
.history_ignore_space(histignspace)
.build();
let mut editor = Editor::new(config);
if !histfile.exists() {
let _ = try!(File::create(histfile.clone())
.chain_err(|| IEK::ReadlineHistoryFileCreationError));
}
let _ = try!(editor.load_history(&histfile).chain_err(|| ReadlineError));
Ok(Readline {
editor: editor,
history_file: histfile,
prompt: prompt,
})
}
pub fn read_line(&mut self) -> Result<Option<String>> {
use rustyline::ReadlineError;
use libimagutil::warn_result::*;
match self.editor.readline(&self.prompt) {
Ok(line) => {
self.editor.add_history_line(&line);
self.editor
.save_history(&self.history_file)
.map_warn_err_str(|e| format!("Could not save history file {} -> {:?}",
self.history_file.display(), e));
return line;
},
Err(ReadlineError::Interrupted) => {
info!("CTRL-C");
Ok(None)
},
Err(ReadlineError::Eof) => {
info!("CTRL-D");
Ok(None)
},
Err(err) => Err(err).map_err_into(ReadlineError),
}
}
}
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