cd function

Signed-off-by: Ava Hahn <ava@sunnypup.io>

Readme.org

@@ -483,16 +483,15 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 
 ** TODO Pre-alpha tasks
 - Shell module
+  - strip final newline from load-to-string
+  - cd with no args goes home
+  - cd sets . symbol
   - ignore job control signals (if needed)
   - background processes
   - be able to list all background processes with j function
   - be able to fg a bg process
   - be able to bg and fg process (ctrl z?)
-  - changedir/cd
-  - pwd
   - Documentation!
-  - Do I need some linemode management stuff?
-  - Function stubs for all posix functions go into minimal shell (posix stub functions)
 - Escape sequences in strings
 - logging library
 - make const all the error messages
@@ -534,9 +533,12 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
   - give a pretty pastel white, pink and blue theme
   - store in repo after giving presentation
         
-** TODO alpha tasks
-- TYPE SYSTEM HAS NO CTR::NONE
-- SEG USES Option() AND IF POSSIBLE NO BOX (maybe strings or symbols or numbers are boxed instead?)
+** TODO v1.0 tasks
+- export function (dump symbol definitions to script and/or append)
+  - then write doc on interactive development
+- completion:
+  - complete string: path search
+  - complete symbol: syms search
 - Write next_has member function for &Seg and simplify stdlib and probably also eval/sym
 - Rename to Flesh
 - Can pass args to relish scripts (via interpreter)
@@ -544,27 +546,23 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 - History length configurable
 - Search delim configurable
 - master branch -> main branch
-- squash top of main and keep pre-alpha history in a historical branch
-- delete snippets/legacy too
 - Create a dedicated community channel on matrix.sunnypup.io
-- get type function
 - Lex function
 - Read function (Input + Lex)
 
-** TODO post-alpha tasks
+** TODO v1.1 tasks
+- execute configurable function on cd
 - Post to relevant channels
 - Custom ast pretty print
 - Implement Compose for lambdas
-  Document this in relevant readme sections
+  - Document this in relevant readme sections
 - File operations
   - read-to-string
   - write-to-file
   - file exists
 - color control library
-- emacs syntax highlighting and/or LSP implementation
-- GNU Guix package
 
-** TODO Second release tasks
+** TODO v1.2 release tasks
 - Network library
   - HTTP Client
   - TCP Stream client
@@ -572,4 +570,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
   - TCP Listener
   - HTTP Listener
   - UDP Listener
+- emacs syntax highlighting and/or LSP implementation
+- GNU Guix package
 - Bindings for the simplest possible UI library