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use core::fmt;
/// Describes one or two characters from the input
///
/// [Rune]s are a way to mark special characters from the input string
/// (i.e. poetry). Some [Rune]s are special--as they denote the end of a
/// [Verse][crate::poem::Verse]--and are refered to as a Meter. For
/// instance, `Addendum`, `Couplet`, `Quiet`, and `And`, are all meters.
/// Meters also determine how the [Stanza][super::stanza::Stanza] should
/// be interpreted. For instance, a [Stanza][super::stanza::Stanza] that
/// is piped needs to have its `STDOUT` captured (rather than printing
/// out to the terminal), and subsequently sent to the next
/// [Verse][crate::poem::Verse] in the [Poem][super::super::Poem].
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub enum Rune {
/// A shell command with no additional actions (the end of a poem)
None,
/// The space character, to dilineate words (`' '`)
Pause,
/// The backslash character, to escape special character (`\`)
Special,
/// The forward slash character, to dilineate paths (`/`)
Path,
/// Indicates a single line comment (`#`)
Remark,
/// Interpret all characters as one large [Word][super::word::Word]
/// (`'` or `"`)
String,
/// A subcommand to run first (`\``)
Poem,
/// Read files into STDIN (`<`)
Read,
/// Write STDOUT to a file (`>`)
Write,
/// Write STDERR to a file (`2>`)
Write2,
/// Write both STDOUT and STDERR to a file (`&>`)
WriteAll,
/// Append STDOUT to a file (`>>`)
Addendum,
/// Append STDERR to a file (`2>>`)
Addendum2,
/// Append both STDOUT and STDERR to a file (`&>>`)
AddendumAll,
/// Pipe the output of this command into the next (`|`)
Couplet,
/// Fork the called process into the background (`&`)
Quiet,
/// Run the next command, only if this one succeeds (`&&`)
And,
/// Run the next command, regardless of whether or not this command
/// succeeds (`;` or a newline in a file)
Continue,
/// Interpret `~` as `$HOME`
Home,
/// Any other character
Else,
}
impl fmt::Display for Rune {
/// Determine how to print out a [Rune]
///
/// Each [Rune]'s symbol corresponds to its input.
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let rune = match self {
Rune::None => "",
Rune::Pause => " ",
Rune::Special => "\\",
Rune::Path => "/",
Rune::Remark => "#",
Rune::String => "\"",
Rune::Poem => "`",
Rune::Read => "<",
Rune::Write => ">",
Rune::Write2 => "2>",
Rune::WriteAll => "&>",
Rune::Addendum => ">>",
Rune::Addendum2 => "2>>",
Rune::AddendumAll => "&>>",
Rune::Couplet => "|",
Rune::Quiet => "&",
Rune::And => "&&",
Rune::Continue => ";",
Rune::Home => "~",
Rune::Else => "_",
};
write!(f, "{}", rune)
}
}
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