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-rw-r--r--helix-view/src/document.rs37
1 files changed, 22 insertions, 15 deletions
diff --git a/helix-view/src/document.rs b/helix-view/src/document.rs
index f4e4b7c6..a1c4b407 100644
--- a/helix-view/src/document.rs
+++ b/helix-view/src/document.rs
@@ -284,8 +284,11 @@ impl Document {
// Index 0 is for tabs, the rest are 1-8 spaces.
let histogram: [usize; 9] = {
let mut histogram = [0; 9];
- let mut prev_line_indent = (false, 0usize); // (was_tabs, count)
+ let mut prev_line_is_tabs = false;
+ let mut prev_line_leading_count = 0usize;
+ // Loop through the lines, checking for and recording indentation
+ // increases as we go.
'outer: for line in self.text.lines().take(1000) {
let mut c_iter = line.chars();
@@ -295,21 +298,22 @@ impl Document {
Some(' ') => false,
// Ignore blank lines.
- Some(c) if char_is_linebreak(c) => continue 'outer,
+ Some(c) if char_is_linebreak(c) => continue,
_ => {
- prev_line_indent = (false, 0usize);
- continue 'outer;
+ prev_line_is_tabs = false;
+ prev_line_leading_count = 0;
+ continue;
}
};
- // Count the total leading tab/space characters.
- let mut count = 1;
+ // Count the line's total leading tab/space characters.
+ let mut leading_count = 1;
let mut count_is_done = false;
for c in c_iter {
match c {
- '\t' if is_tabs && !count_is_done => count += 1,
- ' ' if !is_tabs && !count_is_done => count += 1,
+ '\t' if is_tabs && !count_is_done => leading_count += 1,
+ ' ' if !is_tabs && !count_is_done => leading_count += 1,
// We stop counting if we hit whitespace that doesn't
// qualify as indent or doesn't match the leading
@@ -324,27 +328,30 @@ impl Document {
}
// Bound the worst-case execution time for weird text files.
- if count > 256 {
+ if leading_count > 256 {
continue 'outer;
}
}
- // Update stats.
- if (prev_line_indent.0 == is_tabs || prev_line_indent.1 == 0)
- && prev_line_indent.1 < count
+ // If there was an increase in indentation over the previous
+ // line, update the histogram with that increase.
+ if (prev_line_is_tabs == is_tabs || prev_line_leading_count == 0)
+ && prev_line_leading_count < leading_count
{
if is_tabs {
histogram[0] += 1;
} else {
- let amount = count - prev_line_indent.1;
+ let amount = leading_count - prev_line_leading_count;
if amount <= 8 {
histogram[amount] += 1;
}
}
}
- // Store data for use with the next line.
- prev_line_indent = (is_tabs, count);
+ // Store this line's leading whitespace info for use with
+ // the next line.
+ prev_line_is_tabs = is_tabs;
+ prev_line_leading_count = leading_count;
}
// Give more weight to tabs, because their presence is a very