From 6351ac63d2adef1c9e390a10fae4a7e25dd64b0b Mon Sep 17 00:00:00 2001
From: Ava Affine <ava@sunnypup.io>
Date: Tue, 20 Feb 2024 12:45:34 -0800
Subject: [PATCH] cd now tracks PWD

Signed-off-by: Ava Affine <ava@sunnypup.io>
---
 src/stl/posix.rs | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/stl/posix.rs b/src/stl/posix.rs
index 0257fad..d8e5230 100644
--- a/src/stl/posix.rs
+++ b/src/stl/posix.rs
@@ -41,7 +41,7 @@ use {
         io::Result as IOResult,
         rc::Rc,
         fs::{
-            File, OpenOptions
+            File, OpenOptions, canonicalize,
         },
         path::Path,
         process::{
@@ -715,7 +715,7 @@ fn fg_callback(
 
 const CD_DOCSTRING: &str =
     "Expects 1 argument (a string). Changes to a new directory";
-fn cd_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
+fn cd_callback(ast: &Seg, syms: &mut SymTable) -> Result<Ctr, Traceback> {
     if let Ctr::String(ref dir) = *ast.car {
         let dirp = Path::new(dir);
         if let Err(s) = set_current_dir(dirp) {
@@ -723,7 +723,24 @@ fn cd_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
                 ("cd", s.to_string())
                     .into()))
         } else {
-            Ok(Ctr::None)
+            if let Ok(abs) = canonicalize(dirp) {
+                syms.insert(
+                    String::from("PWD"),
+                    Symbol::from_ast(
+                        &String::from("PWD"),
+                        &String::from("current working directory"),
+                        &Seg::from_mono(Box::new(
+                            Ctr::String(abs.to_string_lossy().into()))),
+                        None,
+                    ));
+
+                // Run configurable user function
+
+                Ok(Ctr::None)
+            } else {
+                Err(start_trace(
+                    ("cd", "cannot make absolute path").into()))
+            }
         }
     } else {
         Err(start_trace(