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|
use std::{
fmt::{Display, Formatter},
io::Write,
ops::Deref,
};
/// Render result, containing the rendered text content.
#[derive(Default, Debug, PartialEq)]
pub struct RenderResult {
render_text: String,
pub exit_code: i32,
}
impl Write for RenderResult {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
let s = std::str::from_utf8(buf).map_err(|_| {
std::io::Error::new(std::io::ErrorKind::InvalidInput, "not valid UTF-8")
})?;
self.render_text.push_str(s);
Ok(buf.len())
}
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
impl Display for RenderResult {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
writeln!(f, "{}", self.render_text.trim())
}
}
impl Deref for RenderResult {
type Target = str;
fn deref(&self) -> &Self::Target {
&self.render_text
}
}
impl From<RenderResult> for String {
fn from(result: RenderResult) -> Self {
result.render_text
}
}
impl From<&RenderResult> for String {
fn from(result: &RenderResult) -> Self {
result.render_text.clone()
}
}
impl RenderResult {
/// Appends the given text to the rendered content.
///
/// # Examples
///
/// ```
/// use mingling_core::RenderResult;
/// use std::ops::Deref;
///
/// let mut result = RenderResult::default();
/// result.print("Hello");
/// result.print(", world!");
/// assert_eq!(result.deref(), "Hello, world!");
/// ```
pub fn print(&mut self, text: &str) {
self.render_text.push_str(text);
}
/// Appends the given text followed by a newline to the rendered content.
///
/// # Examples
///
/// ```
/// use mingling_core::RenderResult;
/// use std::ops::Deref;
///
/// let mut result = RenderResult::default();
/// result.println("First line");
/// result.println("Second line");
/// assert_eq!(result.deref(), "First line\nSecond line\n");
/// ```
pub fn println(&mut self, text: &str) {
self.render_text.push_str(text);
self.render_text.push('\n');
}
/// Clears all rendered content.
///
/// # Examples
///
/// ```
/// use mingling_core::RenderResult;
/// use std::ops::Deref;
///
/// let mut result = RenderResult::default();
/// result.print("Some content");
/// assert!(!result.is_empty());
/// result.clear();
/// assert!(result.is_empty());
/// ```
pub fn clear(&mut self) {
self.render_text.clear();
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::io::Write as IoWrite;
#[test]
fn default_creates_empty_text_with_exit_code_zero() {
let result = RenderResult::default();
assert!(result.is_empty());
assert_eq!(result.exit_code, 0);
}
#[test]
fn print_appends_text() {
let mut result = RenderResult::default();
result.print("Hello");
assert_eq!(result.deref(), "Hello");
}
#[test]
fn println_appends_text_with_newline() {
let mut result = RenderResult::default();
result.println("Hello");
assert_eq!(result.deref(), "Hello\n");
}
#[test]
fn clear_empties_content() {
let mut result = RenderResult::default();
result.print("something");
assert!(!result.is_empty());
result.clear();
assert!(result.is_empty());
}
#[test]
fn is_empty_returns_true_for_new_false_after_print() {
let mut result = RenderResult::default();
assert!(result.is_empty());
result.print("x");
assert!(!result.is_empty());
}
#[test]
fn write_appends_utf8_bytes() {
let mut result = RenderResult::default();
let n = IoWrite::write(&mut result, b"hello").unwrap();
assert_eq!(n, 5);
assert_eq!(result.deref(), "hello");
}
#[test]
fn write_with_invalid_utf8_returns_error() {
let mut result = RenderResult::default();
let err = IoWrite::write(&mut result, &[0xff, 0xfe]).unwrap_err();
assert_eq!(err.kind(), std::io::ErrorKind::InvalidInput);
}
#[test]
fn display_trims_trailing_whitespace() {
let mut result = RenderResult::default();
result.print(" hello world \n");
let formatted = format!("{}", result);
assert_eq!(formatted, "hello world\n");
}
#[test]
fn deref_exposes_inner_text_as_str() {
let mut result = RenderResult::default();
result.print("test");
let s: &str = &result;
assert_eq!(s, "test");
}
#[test]
fn from_render_result_into_string_consumes() {
let mut result = RenderResult::default();
result.print("content");
let s: String = result.into();
assert_eq!(s, "content");
}
#[test]
fn from_ref_render_result_into_string_clones() {
let mut result = RenderResult::default();
result.print("content");
let s: String = String::from(&result);
assert_eq!(s, "content");
// original is still usable
assert!(!result.is_empty());
}
}
|
