The anthology module

The anthology module was added to run built-in commands. The 'cd' and
'exit' built-ins were moved from the main recite() loop to this module.
Additionally, the 'export' and 'source' built-ins were added.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/poem/anthology.rs b/src/poem/anthology.rs
new file mode 100644
index 0000000..2781081
--- /dev/null
+++ b/src/poem/anthology.rs
@@ -0,0 +1,32 @@
+pub mod cd;
+pub mod exit;
+pub mod export;
+pub mod source;
+use crate::poem::Verse;
+use std::path::Path;
+
+/// A static list of all the built-in commands
+static INDEX: [&str; 4] = ["cd", "exit", "export", "source"];
+
+/// Lookup the index of a built-in command
+///
+/// Looks up the index of a built-in command in [INDEX], accounting for aliases
+pub fn lookup(verb: &str) -> Option<usize> {
+    let verb = match verb {
+        "quit" => "exit",  // Alias 'quit' to 'exit'
+        "set" => "export", // Alias 'set' to 'export'
+        _ => verb,
+    };
+    INDEX.iter().position(|v| v.to_string() == verb)
+}
+
+pub fn incant(verse: &Verse, index: usize, path: &Vec<&Path>, bins: &mut Vec<String>) -> i32 {
+    let verb = INDEX[index];
+    match verb {
+        "cd" => cd::incant(verse),
+        "exit" => exit::incant(),
+        "export" => export::incant(verse),
+        "source" => source::incant(verse, path, bins),
+        _ => unreachable!(),
+    }
+}