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use std::borrow::Cow::{self, Owned};
use std::path::PathBuf;
use rustyline::completion::{Completer, FilenameCompleter, Pair};
use rustyline::config::{Builder, ColorMode, CompletionType, EditMode};
use rustyline::error::ReadlineError;
use rustyline::highlight::Highlighter;
use rustyline::hint::{Hinter, HistoryHinter};
use rustyline::{Context, Editor, Helper};
use rustyline::validate::Validator;
use directories::ProjectDirs;
use regex::Regex;
use crate::error::CalcError;
use crate::eval_math_expression;
pub struct RLHelper {
completer: FilenameCompleter,
highlighter: LineHighlighter,
hinter: HistoryHinter,
}
struct LineHighlighter {}
impl Highlighter for LineHighlighter {
fn highlight_hint<'h>(&self, hint: &'h str) -> Cow<'h, str> {
Owned(format!("\x1b[90m{}\x1b[0m", hint))
}
fn highlight<'l>(&self, line: &'l str, _: usize) -> Cow<'l, str> {
use std::fs::OpenOptions;
use std::io::{BufRead, BufReader};
let eva_dirs = ProjectDirs::from("com", "NerdyPepper", "eva").unwrap();
let eva_data_dir = eva_dirs.data_dir();
let mut previous_ans_path = PathBuf::from(eva_data_dir);
previous_ans_path.push("previous_ans.txt");
let file = OpenOptions::new()
.create(true)
.read(true)
.append(true)
.open(&previous_ans_path)
.unwrap();
let rdr = BufReader::new(file);
let lines = rdr.lines().map(|l| l.unwrap());
let prev_ans = match lines.last() {
Some(val) => val.parse::<f64>().ok(),
None => None,
};
let op = eval_math_expression(line, prev_ans);
match op {
Ok(_) => {
let constants = ["e", "pi"];
let functions = [
"sin", "cos", "tan", "csc", "sec", "cot", "sinh", "cosh", "tanh", "ln", "log",
"sqrt", "ceil", "floor", "rad", "deg", "abs", "asin", "acos", "atan", "acsc",
"asec", "acot", "exp2", "exp"
];
let ops = Regex::new(r"(?P<o>[\+-/\*%\^!])").unwrap();
let mut coloured: String = ops.replace_all(line, "\x1b[35m$o\x1b[0m").into();
for c in &constants {
coloured = coloured.replace(c, &format!("\x1b[33m{}\x1b[0m", c));
}
for f in &functions {
coloured = coloured.replace(f, &format!("\x1b[34m{}\x1b[0m", f));
}
Owned(coloured)
}
Err(CalcError::Help) => Owned(line.replace("help", "\x1b[36mhelp\x1b[0m")),
Err(_) => Owned(format!("\x1b[31m{}\x1b[0m", line)),
}
}
}
impl Highlighter for RLHelper {
fn highlight_char(&self, _: &str, _: usize) -> bool { true }
fn highlight_hint<'h>(&self, hint: &'h str) -> Cow<'h, str> {
self.highlighter.highlight_hint(hint)
}
fn highlight<'l>(&self, line: &'l str, pos: usize) -> Cow<'l, str> {
self.highlighter.highlight(line, pos)
}
}
impl Completer for RLHelper {
type Candidate = Pair;
fn complete(
&self,
line: &str,
pos: usize,
ctx: &Context<'_>,
) -> Result<(usize, Vec<Pair>), ReadlineError> {
self.completer.complete(line, pos, ctx)
}
}
impl Hinter for RLHelper {
type Hint = String;
fn hint(&self, line: &str, a: usize, b: &Context) -> Option<Self::Hint> {
self.hinter.hint(line, a, b)
}
}
impl Validator for RLHelper {}
impl Helper for RLHelper {}
pub fn create_readline() -> Editor<RLHelper> {
let config_builder = Builder::new();
let config = config_builder
.color_mode(ColorMode::Enabled)
.edit_mode(EditMode::Emacs)
.history_ignore_space(true)
.completion_type(CompletionType::Circular)
.max_history_size(1000)
.build();
let mut rl = Editor::with_config(config);
let h = RLHelper {
completer: FilenameCompleter::new(),
highlighter: LineHighlighter {},
hinter: HistoryHinter {},
};
rl.set_helper(Some(h));
rl
}
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