altr 0.5.1

CLI tool to alter words seamlessly while preserving casing
Documentation 
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use crate::{casing::Casing, SEPARATOR};

#[derive(Debug)]
pub enum TokenError {
    AmbiguousToLowerCase,
    AmbiguousToUpperCase,
}

#[derive(Debug)]
pub struct Token(String);

impl Token {
    pub fn try_to_casing(&self, casing: &Casing) -> Result<String, TokenError> {
        match casing {
            Casing::Camel => Ok(self.to_camel_case()),
            Casing::Pascal => Ok(self.to_pascal_case()),
            Casing::Lower => self.try_to_lower_case(),
            Casing::Kebab => Ok(self.to_kebab_case()),
            Casing::Snake => Ok(self.to_snake_case()),
            Casing::Upper => self.try_to_upper_case(),
            Casing::UpperSnake => Ok(self.to_upper_snake_case()),
            Casing::UpperKebab => Ok(self.to_upper_kebab_case()),
        }
    }

    pub fn from_casing(casing: &Casing, input: &str) -> crate::Result<Self> {
        match casing {
            Casing::Camel => Token::from_camel_case(input),
            Casing::Pascal => Token::from_pascal_case(input),
            Casing::Lower => Some(Token(input.into())),
            Casing::Kebab => Token::from_kebab_case(input),
            Casing::Snake => Token::from_snake_case(input),
            Casing::Upper => Some(Token(input.into())),
            Casing::UpperSnake => Token::from_upper_snake_case(input),
            Casing::UpperKebab => Token::from_upper_kebab_case(input),
        }
        .ok_or(
            format!(
                "Failed to obtain token from specified casing: {:?} and input: {}",
                casing, input
            )
            .into(),
        )
    }

    pub fn from_camel_case(input: &str) -> Option<Self> {
        let mut result = String::new();

        for (i, ch) in input.chars().enumerate() {
            if ch.is_uppercase() {
                if i == 0 {
                    return None;
                }
                result.push(SEPARATOR);
                result.push(ch.to_ascii_lowercase());
            } else {
                result.push(ch);
            }
        }

        Some(Token(result))
    }

    pub fn from_snake_case(input: &str) -> Option<Self> {
        Some(Token(input.replace('_', &String::from(SEPARATOR))))
    }

    pub fn from_upper_snake_case(input: &str) -> Option<Self> {
        Some(Token(
            input
                .replace('_', &String::from(SEPARATOR))
                .to_ascii_lowercase(),
        ))
    }

    pub fn from_kebab_case(input: &str) -> Option<Self> {
        Some(Token(input.replace('-', &String::from(SEPARATOR))))
    }

    pub fn from_upper_kebab_case(input: &str) -> Option<Self> {
        Some(Token(
            input
                .replace('-', &String::from(SEPARATOR))
                .to_ascii_lowercase(),
        ))
    }

    pub fn from_pascal_case(input: &str) -> Option<Self> {
        let mut result = String::new();

        for (i, ch) in input.chars().enumerate() {
            if ch.is_uppercase() {
                if i == 0 {
                    result.push(ch.to_ascii_lowercase());
                } else {
                    result.push(SEPARATOR);
                    result.push(ch.to_ascii_lowercase());
                }
            } else {
                if i == 0 {
                    return None;
                }
                result.push(ch);
            }
        }

        Some(Token(result))
    }

    pub fn to_camel_case(&self) -> String {
        self.0
            .split(SEPARATOR)
            .enumerate()
            .map(|(i, part)| {
                if i == 0 {
                    part.to_string()
                } else {
                    part.to_string()
                        .char_indices()
                        .map(|(i, ch)| if i == 0 { ch.to_ascii_uppercase() } else { ch })
                        .collect()
                }
            })
            .collect::<Vec<_>>()
            .join("")
    }

    pub fn to_snake_case(&self) -> String {
        self.0.replace(&String::from(SEPARATOR), "_")
    }

    pub fn to_upper_snake_case(&self) -> String {
        self.to_snake_case().to_ascii_uppercase()
    }

    pub fn to_pascal_case(&self) -> String {
        self.0
            .split(SEPARATOR)
            .map(|part| {
                part.to_string()
                    .char_indices()
                    .map(|(i, ch)| if i == 0 { ch.to_ascii_uppercase() } else { ch })
                    .collect::<String>()
            })
            .collect::<Vec<_>>()
            .join("")
    }

    pub fn try_to_lower_case(&self) -> Result<String, TokenError> {
        if self.0.contains(SEPARATOR) {
            Err(TokenError::AmbiguousToLowerCase)
        } else {
            Ok(self.0.clone())
        }
    }

    pub fn try_to_upper_case(&self) -> Result<String, TokenError> {
        if self.0.contains(SEPARATOR) {
            Err(TokenError::AmbiguousToUpperCase)
        } else {
            Ok(self.0.to_ascii_uppercase().clone())
        }
    }

    pub fn to_kebab_case(&self) -> String {
        self.0.replace(&String::from(SEPARATOR), "-")
    }

    pub fn to_upper_kebab_case(&self) -> String {
        self.to_kebab_case().to_ascii_uppercase()
    }

    pub fn from_str(s: &str) -> crate::Result<Self> {
        Token::from_casing(&Casing::detect_casing(s)?, s)
    }
}