conlang: Move all cl-libs into the compiler directory

compiler/cl-repl/src/args.rs

@@ -0,0 +1,51 @@
+//! Handles argument parsing (currently using the [argh] crate)
+
+use argh::FromArgs;
+use std::{io::IsTerminal, path::PathBuf, str::FromStr};
+
+/// The Conlang prototype debug interface
+#[derive(Clone, Debug, FromArgs, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Args {
+    /// the main source file
+    #[argh(positional)]
+    pub file: Option<PathBuf>,
+
+    /// files to include
+    #[argh(option, short = 'I')]
+    pub include: Vec<PathBuf>,
+
+    /// the CLI operating mode (`f`mt | `l`ex | `r`un)
+    #[argh(option, short = 'm', default = "Default::default()")]
+    pub mode: Mode,
+
+    /// whether to start the repl (`true` or `false`)
+    #[argh(option, short = 'r', default = "is_terminal()")]
+    pub repl: bool,
+}
+
+/// gets whether stdin AND stdout are a terminal, for pipelining
+pub fn is_terminal() -> bool {
+    std::io::stdin().is_terminal() && std::io::stdout().is_terminal()
+}
+
+/// The CLI's operating mode
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
+pub enum Mode {
+    #[default]
+    Menu,
+    Lex,
+    Fmt,
+    Run,
+}
+
+impl FromStr for Mode {
+    type Err = &'static str;
+    fn from_str(s: &str) -> Result<Self, &'static str> {
+        Ok(match s {
+            "f" | "fmt" | "p" | "pretty" => Mode::Fmt,
+            "l" | "lex" | "tokenize" | "token" => Mode::Lex,
+            "r" | "run" => Mode::Run,
+            _ => Err("Recognized modes are: 'r' \"run\", 'f' \"fmt\", 'l' \"lex\"")?,
+        })
+    }
+}