liberty-db 0.4.6

`liberty` data structre
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use std::fmt::Write;
#[derive(Debug)]
pub struct CodeFormatter<'a, F> {
  f: &'a mut F,
  level: usize,
  repeat: String,
  indentation: String,
}

impl<'a, F: Write> Write for CodeFormatter<'a, F> {
  fn write_str(&mut self, s: &str) -> std::fmt::Result {
    write!(self.f, "{}", s.replace('\n', format!("\n{}", self.repeat).as_str()))
  }
}

impl<'a, T: Write> CodeFormatter<'a, T> {
  /// Wrap the formatter `f`, use `indentation` as base string indentation and return a new
  /// formatter that implements `std::fmt::Write` that can be used with the macro `write!()`
  pub fn new<S: Into<String>>(f: &'a mut T, indentation: S) -> Self {
    Self {
      f,
      level: 0,
      indentation: indentation.into(),
      repeat: "".into(),
    }
  }

  /// Set the indentation level to a specific value
  pub fn set_level(&mut self, level: usize) {
    self.level = level;
    self.repeat = self.indentation.repeat(self.level);
  }

  /// Increase the indentation level by `inc`
  pub fn indent(&mut self, inc: usize) {
    self.level = self.level.saturating_add(inc);
    self.repeat += &self.indentation.repeat(inc);
  }

  /// Decrease the indentation level by `inc`
  pub fn dedent(&mut self, inc: usize) {
    self.level = self.level.saturating_sub(inc);
    self.repeat = self.indentation.repeat(self.level);
  }
}