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use std::fmt;
use cursive::event::{Event, EventResult, Key};
use cursive::theme::{BaseColor, Color, ColorStyle};
use cursive::view::Resizable;
use cursive::views::{EditView, LinearLayout, OnEventView, TextView};
use cursive::Cursive;
use crate::app::App;
use crate::utils::{GRID_WIDTH, VIEW_WIDTH};
static COMMANDS: &'static [&'static str] = &[
"add",
"add-auto",
"delete",
"track-up",
"track-down",
"month-prev",
"month-next",
"quit",
"write",
"help",
"writeandquit",
];
fn get_command_completion(prefix: &str) -> Option<String> {
let first_match = COMMANDS.iter().filter(|&x| x.starts_with(prefix)).next();
return first_match.map(|&x| x.into());
}
fn get_habit_completion(prefix: &str, habit_names: &[String]) -> Option<String> {
let first_match = habit_names.iter().filter(|&x| x.starts_with(prefix)).next();
return first_match.map(|x| x.into());
}
pub fn open_command_window(s: &mut Cursive) {
let habit_list: Vec<String> = s
.call_on_name("Main", |view: &mut App| {
return view.list_habits();
})
.unwrap();
let style = ColorStyle::new(Color::Dark(BaseColor::Black), Color::Dark(BaseColor::White));
let command_window = OnEventView::new(
EditView::new()
.filler(" ")
.on_submit(call_on_app)
.style(style),
)
.on_event_inner(
Event::Key(Key::Tab),
move |view: &mut EditView, _: &Event| {
let contents = view.get_content();
if !contents.contains(" ") {
let completion = get_command_completion(&*contents);
if let Some(c) = completion {
let cb = view.set_content(c);
return Some(EventResult::Consumed(Some(cb)));
};
return None;
} else {
let word = contents.split(' ').last().unwrap();
let completion = get_habit_completion(word, &habit_list);
if let Some(c) = completion {
let cb = view.set_content(format!("{}", contents) + &c[word.len()..]);
return Some(EventResult::Consumed(Some(cb)));
};
return None;
}
},
)
.fixed_width(VIEW_WIDTH * GRID_WIDTH);
s.call_on_name("Frame", |view: &mut LinearLayout| {
let mut commandline = LinearLayout::horizontal()
.child(TextView::new(":"))
.child(command_window);
commandline.set_focus_index(1);
view.add_child(commandline);
view.set_focus_index(1);
});
}
fn call_on_app(s: &mut Cursive, input: &str) {
// things to do after recieving the command
// 1. parse the command
// 2. clean existing command messages
// 3. remove the command window
// 4. handle quit command
s.call_on_name("Main", |view: &mut App| {
let cmd = Command::from_string(input);
view.clear_message();
view.parse_command(cmd);
});
s.call_on_name("Frame", |view: &mut LinearLayout| {
view.set_focus_index(0);
view.remove_child(view.get_focus_index());
});
// special command that requires access to
// our main cursive object, has to be parsed again
// here
// TODO: fix this somehow
match Command::from_string(input) {
Ok(Command::Quit) | Ok(Command::WriteAndQuit) => s.quit(),
_ => {}
}
}
#[derive(PartialEq)]
pub enum Command {
Add(String, Option<u32>, bool),
MonthPrev,
MonthNext,
Delete(String),
TrackUp(String),
TrackDown(String),
Help(Option<String>),
Write,
Quit,
Blank,
WriteAndQuit,
}
#[derive(Debug)]
pub enum CommandLineError {
InvalidCommand(String), // command name
InvalidArg(u32), // position
NotEnoughArgs(String, u32), // command name, required no. of args
}
impl std::error::Error for CommandLineError {}
impl fmt::Display for CommandLineError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
CommandLineError::InvalidCommand(s) => write!(f, "Invalid command: `{}`", s),
CommandLineError::InvalidArg(p) => write!(f, "Invalid argument at position {}", p),
CommandLineError::NotEnoughArgs(s, n) => {
write!(f, "Command `{}` requires atleast {} argument(s)!", s, n)
}
}
}
}
type Result<T> = std::result::Result<T, CommandLineError>;
impl Command {
pub fn from_string<P: AsRef<str>>(input: P) -> Result<Command> {
let mut strings: Vec<&str> = input.as_ref().trim().split(' ').collect();
if strings.is_empty() {
return Ok(Command::Blank);
}
let first = strings.first().unwrap().to_string();
let mut args: Vec<String> = strings.iter_mut().skip(1).map(|s| s.to_string()).collect();
let mut _add = |auto: bool, first: String| {
if args.is_empty() {
return Err(CommandLineError::NotEnoughArgs(first, 1));
}
let goal = args
.get(1)
.map(|x| {
x.parse::<u32>()
.map_err(|_| CommandLineError::InvalidArg(2))
})
.transpose()?;
return Ok(Command::Add(
args.get_mut(0).unwrap().to_string(),
goal,
auto,
));
};
match first.as_ref() {
"add" | "a" => _add(false, first),
"add-auto" | "aa" => _add(true, first),
"delete" | "d" => {
if args.is_empty() {
return Err(CommandLineError::NotEnoughArgs(first, 1));
}
return Ok(Command::Delete(args[0].to_string()));
}
"track-up" | "tup" => {
if args.is_empty() {
return Err(CommandLineError::NotEnoughArgs(first, 1));
}
return Ok(Command::TrackUp(args[0].to_string()));
}
"track-down" | "tdown" => {
if args.is_empty() {
return Err(CommandLineError::NotEnoughArgs(first, 1));
}
return Ok(Command::TrackDown(args[0].to_string()));
}
"h" | "?" | "help" => {
if args.is_empty() {
return Ok(Command::Help(None));
}
return Ok(Command::Help(Some(args[0].to_string())));
}
"mprev" | "month-prev" => return Ok(Command::MonthPrev),
"mnext" | "month-next" => return Ok(Command::MonthNext),
"wq" | "writeandquit" => return Ok(Command::WriteAndQuit),
"q" | "quit" => return Ok(Command::Quit),
"w" | "write" => return Ok(Command::Write),
"" => return Ok(Command::Blank),
s => return Err(CommandLineError::InvalidCommand(s.into())),
}
}
}
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