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#[derive(Debug)]
pub struct CommandBox {
pub history: History<String>,
pub hist_idx: Option<usize>,
pub text: String,
pub cursor: usize,
}
impl CommandBox {
pub fn new() -> Self {
CommandBox {
history: History::new(64),
hist_idx: None,
text: String::new(),
cursor: 0,
}
}
pub fn forward(&mut self) {
if self.cursor < self.text.len() {
self.cursor += 1;
}
}
fn cursor_end(&mut self) {
self.cursor = self.text.len();
}
fn cursor_start(&mut self) {
self.cursor = 0;
}
pub fn backward(&mut self) {
self.cursor = self.cursor.saturating_sub(1);
}
pub fn backspace(&mut self) {
if self.cursor != 0 {
self.text.remove(self.cursor - 1);
self.backward();
}
}
pub fn delete(&mut self) {
if self.cursor < self.text.len() {
self.text.remove(self.cursor);
}
}
pub fn push_str(&mut self, v: &str) {
self.text.push_str(v);
self.cursor += v.len();
}
pub fn is_empty(&self) -> bool {
self.text.is_empty()
}
pub fn clear(&mut self) {
self.text.clear();
self.cursor = 0;
}
pub fn hist_append(&mut self) {
self.history.append(self.text.drain(..).collect());
self.cursor_start();
}
fn get_from_hist(&self) -> String {
let size = self.history.items.len();
self.history.items[size - 1 - self.hist_idx.unwrap()].clone()
}
pub fn hist_prev(&mut self) {
if let Some(idx) = self.hist_idx {
if !(idx + 1 >= self.history.items.len()) {
self.hist_idx = Some(idx + 1);
self.text = self.get_from_hist();
self.cursor_end();
}
} else {
self.hist_idx = Some(0);
self.text = self.get_from_hist();
self.cursor_end();
}
}
pub fn hist_next(&mut self) {
if let Some(idx) = self.hist_idx {
// most recent hist item, reset command box
if idx == 0 {
self.hist_idx = None;
self.text = "(".into();
} else {
self.hist_idx = Some(idx - 1);
self.text = self.get_from_hist();
}
self.cursor_end();
}
}
}
#[derive(Debug)]
pub struct History<T> {
pub items: Vec<T>,
pub max_size: usize,
}
impl<T> History<T> {
pub fn new(max_size: usize) -> Self {
if max_size == 0 {
panic!();
}
Self {
items: vec![],
max_size,
}
}
pub fn append(&mut self, item: T) {
if self.items.len() >= self.max_size {
self.items.remove(0);
}
self.items.push(item);
}
}
#[cfg(test)]
mod command_tests {
use super::*;
fn setup_with(text: &str) -> CommandBox {
let mut cmd = CommandBox::new();
cmd.push_str(text);
cmd
}
#[test]
fn entering_text() {
let cmd = setup_with("save as file.png");
assert_eq!(&cmd.text, "save as file.png");
assert_eq!(cmd.cursor, 16)
}
#[test]
fn backspacing_from_end() {
let mut cmd = setup_with("save");
cmd.backspace();
assert_eq!(&cmd.text, "sav");
assert_eq!(cmd.cursor, 3);
}
#[test]
fn backspacing_from_middle() {
let mut cmd = setup_with("save");
cmd.backward();
cmd.backspace();
assert_eq!(&cmd.text, "sae");
assert_eq!(cmd.cursor, 2);
}
#[test]
fn delete() {
let mut cmd = setup_with("save");
cmd.backward();
cmd.delete();
assert_eq!(&cmd.text, "sav");
assert_eq!(cmd.cursor, 3);
}
#[test]
fn delete_end() {
let mut cmd = setup_with("save");
cmd.delete();
assert_eq!(&cmd.text, "save");
}
#[test]
fn delete_all() {
let mut cmd = setup_with("save");
for _ in 0..4 {
cmd.backward();
}
for _ in 0..4 {
cmd.delete();
}
assert_eq!(&cmd.text, "");
assert_eq!(cmd.cursor, 0);
}
#[test]
fn seeking() {
let mut cmd = setup_with("save");
for _ in 0..4 {
cmd.backward();
}
assert_eq!(cmd.cursor, 0);
cmd.forward();
assert_eq!(cmd.cursor, 1);
}
#[test]
fn hist_append() {
let mut cmd = setup_with("hello");
cmd.hist_append();
cmd.push_str("another");
cmd.hist_append();
cmd.push_str("one");
cmd.hist_append();
assert_eq!(cmd.history.items.len(), 3);
}
#[test]
fn hist_prev() {
let mut cmd = setup_with("hello");
cmd.hist_append();
cmd.push_str("another");
cmd.hist_append();
cmd.push_str("one");
cmd.hist_append();
cmd.hist_prev();
assert_eq!(&cmd.text, "one");
cmd.hist_prev();
assert_eq!(&cmd.text, "another");
}
#[test]
fn hist_next() {
let mut cmd = setup_with("hello");
cmd.hist_append();
cmd.push_str("another");
cmd.hist_append();
cmd.push_str("one");
cmd.hist_append();
cmd.hist_prev();
cmd.hist_prev();
cmd.hist_next();
assert_eq!(&cmd.text, "one");
}
}
#[cfg(test)]
mod history_tests {
use super::*;
#[test]
fn append() {
let mut h = History::<u32>::new(4);
h.append(5);
h.append(6);
h.append(7);
h.append(8);
h.append(9);
assert_eq!(h.items, vec![6, 7, 8, 9]);
}
}
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