clap_builder/output/textwrap/
mod.rs

1//! Fork of `textwrap` crate
2//!
3//! Benefits of forking:
4//! - Pull in only what we need rather than relying on the compiler to remove what we don't need
5//! - `LineWrapper` is able to incrementally wrap which will help with `StyledStr`
6
7pub(crate) mod core;
8#[cfg(feature = "wrap_help")]
9pub(crate) mod word_separators;
10#[cfg(feature = "wrap_help")]
11pub(crate) mod wrap_algorithms;
12
13#[cfg(feature = "wrap_help")]
14pub(crate) fn wrap(content: &str, hard_width: usize) -> String {
15    let mut wrapper = wrap_algorithms::LineWrapper::new(hard_width);
16    let mut total = Vec::new();
17    for line in content.split_inclusive('\n') {
18        wrapper.reset();
19        let line = word_separators::find_words_ascii_space(line).collect::<Vec<_>>();
20        total.extend(wrapper.wrap(line));
21    }
22    total.join("")
23}
24
25#[cfg(not(feature = "wrap_help"))]
26pub(crate) fn wrap(content: &str, _hard_width: usize) -> String {
27    content.to_owned()
28}
29
30#[cfg(test)]
31#[cfg(feature = "wrap_help")]
32mod test {
33    /// Compatibility shim to keep textwrap's tests
34    fn wrap(content: &str, hard_width: usize) -> Vec<String> {
35        super::wrap(content, hard_width)
36            .trim_end()
37            .split('\n')
38            .map(|s| s.to_owned())
39            .collect::<Vec<_>>()
40    }
41
42    #[test]
43    fn no_wrap() {
44        assert_eq!(wrap("foo", 10), vec!["foo"]);
45    }
46
47    #[test]
48    fn wrap_simple() {
49        assert_eq!(wrap("foo bar baz", 5), vec!["foo", "bar", "baz"]);
50    }
51
52    #[test]
53    fn to_be_or_not() {
54        assert_eq!(
55            wrap("To be, or not to be, that is the question.", 10),
56            vec!["To be, or", "not to be,", "that is", "the", "question."]
57        );
58    }
59
60    #[test]
61    fn multiple_words_on_first_line() {
62        assert_eq!(wrap("foo bar baz", 10), vec!["foo bar", "baz"]);
63    }
64
65    #[test]
66    fn long_word() {
67        assert_eq!(wrap("foo", 0), vec!["foo"]);
68    }
69
70    #[test]
71    fn long_words() {
72        assert_eq!(wrap("foo bar", 0), vec!["foo", "bar"]);
73    }
74
75    #[test]
76    fn max_width() {
77        assert_eq!(wrap("foo bar", usize::MAX), vec!["foo bar"]);
78
79        let text = "Hello there! This is some English text. \
80                    It should not be wrapped given the extents below.";
81        assert_eq!(wrap(text, usize::MAX), vec![text]);
82    }
83
84    #[test]
85    fn leading_whitespace() {
86        assert_eq!(wrap("  foo bar", 6), vec!["  foo", "  bar"]);
87    }
88
89    #[test]
90    fn leading_whitespace_empty_first_line() {
91        // If there is no space for the first word, the first line
92        // will be empty. This is because the string is split into
93        // words like [" ", "foobar ", "baz"], which puts "foobar " on
94        // the second line. We never output trailing whitespace
95        assert_eq!(wrap(" foobar baz", 6), vec!["", " foobar", " baz"]);
96    }
97
98    #[test]
99    fn trailing_whitespace() {
100        // Whitespace is only significant inside a line. After a line
101        // gets too long and is broken, the first word starts in
102        // column zero and is not indented.
103        assert_eq!(wrap("foo     bar     baz  ", 5), vec!["foo", "bar", "baz"]);
104    }
105
106    #[test]
107    fn issue_99() {
108        // We did not reset the in_whitespace flag correctly and did
109        // not handle single-character words after a line break.
110        assert_eq!(
111            wrap("aaabbbccc x yyyzzzwww", 9),
112            vec!["aaabbbccc", "x", "yyyzzzwww"]
113        );
114    }
115
116    #[test]
117    fn issue_129() {
118        // The dash is an em-dash which takes up four bytes. We used
119        // to panic since we tried to index into the character.
120        assert_eq!(wrap("x – x", 1), vec!["x", "–", "x"]);
121    }
122}
clap_builder/output/textwrap/mod.rs

clap_builder/output/textwrap/
mod.rs
