use crate::utils;
use std::collections::HashMap;
pub struct Section {
pub title: String,
pub entries: HashMap<&'static str, &'static str>,
}
impl Section {
fn max_entry_key_size(&self) -> usize {
if let Some(key) = self.entries.keys().max_by_key(|k| k.len()) {
key.len()
} else {
0
}
}
#[must_use]
pub fn format(&self) -> String {
let title_str = utils::as_bold(self.title.as_str());
let mut body: Vec<String> = Vec::new();
let whitespace_offset = self.max_entry_key_size();
for (cmd, cmd_help_msg) in &self.entries {
let whitespace = " ".repeat(whitespace_offset - cmd.len() + 1);
body.push(format!("{cmd}{whitespace}=> {cmd_help_msg}"));
}
body.sort();
let body_str = body.join("\n ");
format!("{title_str}\n {body_str}")
}
}
pub struct Help {
pub sections: Vec<Section>,
}
impl Help {
#[must_use]
pub fn new() -> Help {
Help {
sections: vec![
Section {
title: String::from("Normal commands"),
entries: HashMap::from([
("j", "move cursor down one row (<n>j moves it by n rows)"),
("k", "move cursor up one row (<n>k moves it by n rows)"),
("h", "move cursor left (<n>h moves it n times)"),
("l", "move cursor right (<n>l moves it n times)"),
(
"}",
"move to the end of the current paragraph (<n>} moves n times)",
),
(
"{",
"move to the start of the current paragraph (<n>{ moves n times)",
),
(
"w",
"move to the end of the current word (<n>w moves n times)",
),
(
"b",
"move to the start of the current word (<n>b moves n times)",
),
("i", "switch to insert mode"),
("g", "go to beginining of document"),
("G", "go to end of document"),
("0", "go to first character in line"),
("^", "go to first non-whitespace character in line"),
("$", "go to end of line"),
("H", "go to first line in screen"),
("M", "go to line in the middle of the screen"),
("L", "go to last line in screen"),
("n%", "move to n% in the file"),
("/", "open search prompt"),
("n", "go to next search match"),
("N", "go to previous search match"),
("d", "delete current line"),
("x", "delete current character"),
("o", "insert newline after current line & enter insert mode"),
(
"O",
"insert newline before current line & enter insert mode",
),
("A", "go to end of line & enter insert mode"),
("J", "join the current line with the next one"),
(":", "open command prompt"),
("u", "undo last operation"),
]),
},
Section {
title: String::from("Prompt commands"),
entries: HashMap::from([
("help", "display this help screen"),
("ln", "toggle line numbers"),
("new <filename>", "open a new file"),
("open/o <filename>", "open a file"),
("q", "quit bo"),
("stats", "toggle line/word stats"),
("w <new_name>", "save"),
("wq", "save and quit"),
]),
},
Section {
title: String::from("Insert commands"),
entries: HashMap::from([("Esc", "go back to normal mode")]),
},
],
}
}
#[must_use]
pub fn format(&self) -> String {
let mut out: Vec<String> = Vec::new();
for section in &self.sections {
let section_format = section.format();
out.push(section_format);
}
out.join("\n\n")
}
}
impl Default for Help {
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
#[path = "./help_test.rs"]
mod help_test;