adding whos() functionality. fixes issue #37

Author: JeffBezanson

j/client.j

@@ -144,6 +144,14 @@ function _start()
             global PGRP = ProcessGroup(0, {}, {})
         end
 
+        global VARIABLES = {}
+
+        # Load customized startup
+        try
+            load(strcat(getcwd(),"/custom.j"))
+        catch
+        end
+
         (quiet,repl) = process_options(ARGS)
 
         if repl

j/show.j

@@ -283,3 +283,17 @@ function show(a::Array)
                          print(slice2d(a, idxs), idxs == tail ? "" : "\n\n")),
                   map(x->Range1(1,x), tail))
 end
+
+summary(x) = string(typeof(x))
+
+summary{T}(a::Array{T}) = strcat(join("x",map(string,size(a))),
+                                 " ", string(T), " array")
+
+function whos()
+    global VARIABLES
+    for v = map(symbol,sort(map(string, VARIABLES)))
+        if isbound(v)
+            println(rpad(v, 30), summary(eval(v)))
+        end
+    end
+end

j/start_image.j

@@ -18,9 +18,3 @@ libLAPACK = libBLAS
 libarpack = dlopen("libarpack")
 libfftw = dlopen("libfftw3")
 libfftwf = dlopen("libfftw3f")
-
-# Load customized startup
-try
-    load(strcat(getcwd(),"/custom.j"))
-catch
-end

src/module.c

@@ -15,6 +15,8 @@
 jl_module_t *jl_system_module;
 jl_module_t *jl_user_module;
 
+static jl_binding_t *varlist_binding=NULL;
+
 jl_module_t *jl_new_module(jl_sym_t *name)
 {
     jl_module_t *m = (jl_module_t*)allocb(sizeof(jl_module_t));
@@ -37,6 +39,16 @@ jl_binding_t *jl_get_binding(jl_module_t *m, jl_sym_t *var)
         b->constp = 0;
         b->exportp = 0;
         *bp = b;
+
+        // keep track of all variables added after the VARIABLES array
+        // is defined
+        if (varlist_binding &&
+            varlist_binding->value != NULL &&
+            jl_typeis(varlist_binding->value, jl_array_any_type)) {
+            jl_array_t *a = (jl_array_t*)varlist_binding->value;
+            jl_array_grow_end(a, 1);
+            jl_cellset(a, a->length-1, (jl_value_t*)var);
+        }
     }
     return *bp;
 }
@@ -100,4 +112,5 @@ void jl_init_modules()
 {
     jl_system_module = jl_new_module(jl_symbol("System"));
     jl_user_module = jl_new_module(jl_symbol("User"));
+    varlist_binding = jl_get_binding(jl_system_module, jl_symbol("VARIABLES"));
 }