66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct FilePos {
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pub line: usize,
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pub col: usize,
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}
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#[derive(Debug, Clone, Copy)]
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pub struct FileRegion {
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pub start: FilePos,
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pub end: FilePos,
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}
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impl FilePos {
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pub fn start() -> Self {
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Self { line: 0, col: 0 }
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}
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}
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const BEFORE: usize = 1;
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const AFTER: usize = 1;
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impl FileRegion {
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pub fn write_for(&self, writer: &mut impl std::io::Write, file: &str) -> std::io::Result<()> {
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let start = self.start.line.saturating_sub(BEFORE);
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let num_before = self.start.line - start;
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let mut lines = file.lines().skip(start);
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let width = format!("{}", self.end.line + AFTER).len();
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let same_line = self.start.line == self.end.line;
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for i in 0..num_before {
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writeln!(writer, "{:>width$} | {}", start + i, lines.next().unwrap())?;
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}
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let line = lines.next().unwrap();
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writeln!(writer, "{:>width$} | {}", self.start.line, line)?;
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let len = if same_line {
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self.end.col - self.start.col + 1
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} else {
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line.len() - self.start.col
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};
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writeln!(
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writer,
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"{} | {}",
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" ".repeat(width),
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" ".repeat(self.start.col) + &"^".repeat(len)
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)?;
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if !same_line {
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for _ in 0..self.end.line - self.start.line - 1 {
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lines.next();
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}
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let line = lines.next().unwrap();
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writeln!(writer, "{:>width$} | {}", self.end.line, line)?;
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writeln!(
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writer,
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"{} | {}",
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" ".repeat(width),
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"^".repeat(self.end.col + 1)
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)?;
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}
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for i in 0..AFTER {
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if let Some(next) = lines.next() {
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writeln!(writer, "{:>width$} | {}", self.end.line + i + 1, next)?;
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}
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}
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Ok(())
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}
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}
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