comments support, script loading support

Readme.md

@@ -49,6 +49,10 @@ See `stdlib/control_flow.go`. We have if and while forms:
 
 We also have functioning implementations of map and reduce in the stdlib (incomplete)
 
+## Comments
+The standard delimiter for comments is ;
+any characters after a semicolon will be ignored until end of line
+
 ## How to build
 ### Compiling/Installation
 - For now simply run `go install cmd/...` for each utility you wish to use. If you have GOPATH and GOBIN set it should be usable from PATH
@@ -69,9 +73,14 @@ We also have functioning implementations of map and reduce in the stdlib (incomp
 * one can write arbitrary shs script into `.shsrc` including function and variable declarations
 * of note are the following variables
     - `SH_LOGGING` Sets the log level (from 0 to 3)
-    - `SHS_SH_PROMPT` Sets the prompt
+    - `SHS_STATIC_PROMPT` Sets the prompt
     - `SH_HIST_FILE` Sets the history file
-    - `SH_DEBUG_MODE` Adds additional debug output for the lexer
+    - `SH_DEBUG_MODE` Adds additional debug output for the lexer (high clutter)
+* additionally, the repl will evaluate any function you define as `_SH_PROMPT` before the shell prompt
+    - if defined, the function will be evaluated before printing the prompt
+    - the function will be given 0 arguments
+    - if the function does not return a string, its output will be discarded
+    - afterwards, the repl will print the values in `SHS_STATIC_PROMPT`
 Here is an example of a shs configuration file:
 ```lisp
 (export GOPATH (concat HOME     "/go"))
@@ -80,6 +89,8 @@ Here is an example of a shs configuration file:
 (export GIT_TERMINAL_PROMPT 1)
 (export SH_HIST_FILE (concat HOME "/.shs_hist"))
 (export SH_LOGGING 0)
+(export SHS_STATIC_PROMPT ">")
+(func _SH_PROMPT () (concat (?) ($ basename ($ pwd)) "\n"))
 ```
 
 ## Contributing