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|
use unicode_width::UnicodeWidthStr;
pub(crate) const RESET: &str = "\x1b[0m";
pub(crate) fn move_to(row: usize, col: usize) -> String {
format!("\x1b[{};{}H", row + 1, col + 1)
}
pub(crate) fn format_time_ago(then_unix_secs: Option<u64>, now_unix_secs: u64) -> String {
let Some(then) = then_unix_secs else {
return "—".to_string();
};
let diff = now_unix_secs.saturating_sub(then);
let body = if diff < 5 {
"just now".to_string()
} else if diff < 60 {
format!("{}s ago", diff)
} else if diff < 3600 {
format!("{}m ago", diff / 60)
} else if diff < 86400 {
format!("{}h ago", diff / 3600)
} else {
format!("{}d ago", diff / 86400)
};
format!("Active {}", body)
}
pub(crate) fn pad_or_truncate(text: &str, width: usize) -> String {
let text_w = UnicodeWidthStr::width(text);
if width == 0 {
return String::new();
}
if text_w == width {
return text.to_string();
}
if text_w < width {
return format!("{}{}", text, " ".repeat(width - text_w));
}
if width == 1 {
let first = text.chars().find(|c| char_width(*c) <= 1);
return first.map(String::from).unwrap_or_else(|| " ".to_string());
}
let mut out = String::new();
let mut taken = 0;
let target = width - 1;
for ch in text.chars() {
let w = char_width(ch);
if taken + w > target {
break;
}
out.push(ch);
taken += w;
}
out.push('…');
let out_w = UnicodeWidthStr::width(out.as_str());
out.push_str(&" ".repeat(width.saturating_sub(out_w)));
out
}
fn char_width(ch: char) -> usize {
let mut buf = [0u8; 4];
UnicodeWidthStr::width(ch.encode_utf8(&mut buf) as &str)
}
pub(crate) fn visible_width(text: &str) -> usize {
let bytes = text.as_bytes();
let mut width = 0;
let mut i = 0;
while i < bytes.len() {
if bytes[i] == 0x1b {
i = skip_escape(bytes, i);
continue;
}
let ch_len = utf8_char_len(bytes[i]).max(1);
if let Some(s) = bytes
.get(i..i + ch_len)
.and_then(|b| std::str::from_utf8(b).ok())
{
width += UnicodeWidthStr::width(s);
}
i += ch_len;
}
width
}
pub(crate) fn slice_ansi_visible(line: &str, h_offset: usize, max_cols: usize) -> String {
if max_cols == 0 {
return String::new();
}
let bytes = line.as_bytes();
let right_edge = h_offset.saturating_add(max_cols);
let mut out = String::new();
let mut cell = 0usize;
let mut i = 0;
while i < bytes.len() {
if bytes[i] == 0x1b {
let end = skip_escape(bytes, i);
if let Ok(esc) = std::str::from_utf8(&bytes[i..end]) {
out.push_str(esc);
}
i = end;
continue;
}
let ch_len = utf8_char_len(bytes[i]).max(1);
let end = (i + ch_len).min(bytes.len());
let Ok(ch) = std::str::from_utf8(&bytes[i..end]) else {
i = end;
continue;
};
let w = UnicodeWidthStr::width(ch);
if w == 0 {
if cell > h_offset && cell <= right_edge && !out.is_empty() {
out.push_str(ch);
}
} else if cell + w <= h_offset {
} else if cell < h_offset {
out.push(' ');
} else if cell >= right_edge || cell + w > right_edge {
break;
} else {
out.push_str(ch);
}
cell += w;
i = end;
}
out.push_str(RESET);
out
}
fn skip_escape(bytes: &[u8], start: usize) -> usize {
let mut i = start + 1;
match bytes.get(i) {
Some(b'[') => {
i += 1;
while i < bytes.len() && !(0x40..=0x7e).contains(&bytes[i]) {
i += 1;
}
(i + 1).min(bytes.len())
},
Some(b']') => {
i += 1;
while i < bytes.len()
&& bytes[i] != 0x07
&& !(bytes[i] == 0x1b && bytes.get(i + 1) == Some(&b'\\'))
{
i += 1;
}
match bytes.get(i) {
Some(0x07) => i + 1,
Some(0x1b) => (i + 2).min(bytes.len()),
_ => i,
}
},
Some(_) => i + 1,
None => i,
}
}
fn utf8_char_len(byte: u8) -> usize {
match byte {
b if b < 0xc0 => 1,
b if b < 0xe0 => 2,
b if b < 0xf0 => 3,
_ => 4,
}
}
#[cfg(test)]
mod tests {
use super::*;
fn visible(s: &str) -> &str {
s.strip_suffix(RESET).unwrap_or(s)
}
#[test]
fn ascii_slice_inside_line() {
assert_eq!(visible(&slice_ansi_visible("abcdefghij", 2, 4)), "cdef");
}
#[test]
fn ascii_slice_at_left_edge() {
assert_eq!(visible(&slice_ansi_visible("abcdefghij", 0, 4)), "abcd");
}
#[test]
fn ascii_slice_past_right_edge() {
assert_eq!(visible(&slice_ansi_visible("abcd", 1, 10)), "bcd");
}
#[test]
fn empty_when_offset_past_line_width() {
let sliced = slice_ansi_visible("abcd", 10, 4);
assert_eq!(visible(&sliced), "");
assert!(sliced.ends_with(RESET));
}
#[test]
fn max_cols_zero_returns_empty() {
assert_eq!(slice_ansi_visible("abcd", 0, 0), "");
}
#[test]
fn ansi_escape_preserved_when_in_window() {
let sliced = slice_ansi_visible("\x1b[31mred\x1b[0m end", 0, 7);
assert!(sliced.contains("\x1b[31m"));
assert!(sliced.contains("\x1b[0m"));
assert!(sliced.contains("red"));
assert!(sliced.contains("end"));
}
#[test]
fn ansi_escape_replayed_when_offset_skips_text() {
let sliced = slice_ansi_visible("\x1b[31maaaa\x1b[32mbbbb", 4, 4);
assert!(sliced.contains("\x1b[31m"));
assert!(sliced.contains("\x1b[32m"));
assert!(sliced.contains("bbbb"));
assert!(!sliced.contains("aaaa"));
}
#[test]
fn wide_char_straddling_left_boundary_becomes_space() {
assert_eq!(visible(&slice_ansi_visible("中abc", 1, 3)), " ab");
}
#[test]
fn wide_char_straddling_right_boundary_dropped() {
assert_eq!(visible(&slice_ansi_visible("ab中cd", 0, 3)), "ab");
}
#[test]
fn wide_char_entirely_inside_window() {
assert_eq!(visible(&slice_ansi_visible("ab中cd", 0, 4)), "ab中");
}
}
|
