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printer: support previews for long lines

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This commit adds support for showing a preview of long lines. While the
default still remains as completely suppressing the entire line, this
new functionality will show the first N graphemes of a matching line,
including the number of matches that are suppressed.

This was unfortunately a fairly invasive change to the printer that
required a bit of refactoring. On the bright side, the single line
and multi-line coloring are now more unified than they were before.

Closes #1078
This commit is contained in:
Andrew Gallant
2019-04-13 18:35:24 -04:00
parent a7d26c8f14
commit ece1f50cfe
8 changed files with 520 additions and 111 deletions
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13
grep-printer/src/util.rs
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@ -346,7 +346,7 @@ impl Serialize for NiceDuration {
///
/// This stops trimming a prefix as soon as it sees non-whitespace or a line
/// terminator.
pub fn trim_ascii_prefix_range(
pub fn trim_ascii_prefix(
line_term: LineTerminator,
slice: &[u8],
range: Match,
@ -366,14 +366,3 @@ pub fn trim_ascii_prefix_range(
.count();
range.with_start(range.start() + count)
}
/// Trim prefix ASCII spaces from the given slice and return the corresponding
/// sub-slice.
pub fn trim_ascii_prefix(line_term: LineTerminator, slice: &[u8]) -> &[u8] {
let range = trim_ascii_prefix_range(
line_term,
slice,
Match::new(0, slice.len()),
);
&slice[range]
}