nostui 0.1.1

A TUI client for Nostr
Documentation 
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use unicode_width::UnicodeWidthStr;

pub fn wrap_text(s: &str, width: usize) -> String {
    if width == 0 {
        return String::from("");
    }

    s.chars().fold(String::from(""), |acc: String, c: char| {
        let last_line = acc.lines().last().unwrap_or(&acc);
        if last_line.width() + c.to_string().width() > width {
            format!("{}\n{}", acc, c)
        } else {
            format!("{}{}", acc, c)
        }
    })
}

pub fn truncate_text(s: &str, height: usize) -> String {
    if height == 0 {
        return String::from("");
    }

    let lines: Vec<&str> = s.lines().collect();
    if lines.len() > height {
        if height == 1 {
            String::from("...")
        } else {
            format!("{}\n...", lines[..height - 1].join("\n")) // TODO: support windows
        }
    } else {
        s.to_string()
    }
}

pub fn shorten_hex(hex: &str) -> String {
    let pubkey = hex.to_string();
    let len = pubkey.len();
    let heading = &pubkey[0..5];
    let trail = &pubkey[(len - 5)..len];
    format!("{}:{}", heading, trail)
}

#[cfg(test)]
mod tests {
    use pretty_assertions::assert_eq;

    use super::*;

    #[test]
    fn test_wrap_text_no_wrap_alnum() {
        let actual = wrap_text("hello, world!", 13);
        let expected = "hello, world!";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_wrap_alnum() {
        let actual = wrap_text("hello, world!", 4);
        let expected = "hell\no, w\norld\n!";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_no_wrap_double_width() {
        let actual = wrap_text("こんにちは、世界！", 18);
        let expected = "こんにちは、世界！";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_wrap_double_width() {
        let actual = wrap_text("こんにちは、世界！", 7);
        let expected = "こんに\nちは、\n世界！";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_no_wrap_emoji() {
        let actual = wrap_text("🫲🫱🫲🫱🫲🫱", 12);
        let expected = "🫲🫱🫲🫱🫲🫱";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_wrap_emoji() {
        let actual = wrap_text("🫲🫱🫲🫱🫲🫱", 5);
        let expected = "🫲🫱\n🫲🫱\n🫲🫱";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_wrap_text_zero_width() {
        let actual = wrap_text("hello, world!", 0);
        let expected = "";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_truncate_text_no_truncate() {
        let actual = truncate_text("foo\nbar\nbaz", 3);
        let expected = "foo\nbar\nbaz";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_truncate_text_truncate() {
        let actual = truncate_text("foo\nbar\nbaz", 2);
        let expected = "foo\n...";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_truncate_text_single_line() {
        let actual = truncate_text("foo\nbar", 1);
        let expected = "...";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_truncate_text_zero_height() {
        let actual = truncate_text("foo\nbar\nbaz", 0);
        let expected = "";
        assert_eq!(actual, expected);
    }

    #[test]
    fn test_shortened() {
        assert_eq!(
            shorten_hex("4d39c23b3b03bf99494df5f3a149c7908ae1bc7416807fdd6b34a31886eaae25"),
            "4d39c:aae25"
        );
    }
}