1 files changed, 45 insertions, 0 deletions
diff --git a/src/commandline/builtins.rs b/src/commandline/builtins.rs
new file mode 100644
index 0000000..c5999f2
--- /dev/null
+++ b/src/commandline/builtins.rs
@@ -0,0 +1,45 @@
+use std::io::{Error, ErrorKind::InvalidInput};
+use std::path::{Path, PathBuf};
+use super::command::RunResult;
+
+pub(in crate::commandline) fn cd(args: &[String], home: &PathBuf) -> Result<RunResult, Error> {
+    if args.len() > 1 {
+        return Err(Error::new(
+            InvalidInput,
+            "Too many arguments passed to cd",
+        ));
+    }
+
+    let root = if args.len() == 0 {
+        home.to_path_buf()
+    } else {
+        std::fs::canonicalize(Path::new(args[0].as_str()))?
+    };
+
+    match std::env::set_current_dir(&root) {
+        Ok(_) => Ok(RunResult::Builtin),
+        Err(e) => Err(e),
+    }
+}
+
+pub(in crate::commandline) fn set(args: &[String]) -> Result<RunResult, Error> {
+    if args.len() != 2 {
+        return Err(Error::new(
+            InvalidInput,
+            format!("set requires 2 arguments, got {}", args.len()),
+        ));
+    }
+    std::env::set_var(&args[0], &args[1]);
+    Ok(RunResult::Builtin)
+}
+
+pub(in crate::commandline) fn unset(args: &[String]) -> Result<RunResult, Error> {
+    if args.len() != 1 {
+        return Err(Error::new(
+            InvalidInput,
+            format!("unset requires 1 argument, got {}", args.len()),
+        ));
+    }
+    std::env::remove_var(&args[0]);
+    Ok(RunResult::Builtin)
+}