diff --git a/cmdln/new.c b/cmdln/new.c
index f0d537f..4ecf495 100644
--- a/cmdln/new.c
+++ b/cmdln/new.c
@@ -17,7 +17,7 @@ struct cmdln_flags* new_cmdln_flags(
     
     bool echo = false;
     
-    bool rainbow = false;
+    bool print_with_colors = false;
     
     bool read_init_file = true;
     
@@ -30,7 +30,7 @@ struct cmdln_flags* new_cmdln_flags(
     static const struct option long_options[] = {
         {"echo", no_argument, 0, 1},
         
-        {"echo-rainbow", no_argument, 0, 2},
+        {"color", no_argument, 0, 2},
         
         {"no-init", no_argument, 0, 3},
         
@@ -54,11 +54,11 @@ struct cmdln_flags* new_cmdln_flags(
                 break;
             }
             
-            case 2: // --echo-rainbow
+            case 2: // --color
             {
                 echo = true;
                 
-                rainbow = true;
+                print_with_colors = true;
                 
                 break;
             }
@@ -139,7 +139,7 @@ struct cmdln_flags* new_cmdln_flags(
     
     flags->echo = echo;
     
-    flags->rainbow = rainbow;
+    flags->print_with_colors = print_with_colors;
     
     flags->read_init_file = read_init_file;
     
diff --git a/cmdln/struct.h b/cmdln/struct.h
index 8104550..8e2d774 100644
--- a/cmdln/struct.h
+++ b/cmdln/struct.h
@@ -12,7 +12,7 @@ struct cmdln_flags
 {
     bool echo;
     
-    bool rainbow;
+    bool print_with_colors;
     
     enum input_kind input_kind;
     
diff --git a/examples/sandbox.txt b/examples/sandbox.txt
index 7c9d60f..02c7dd8 100644
--- a/examples/sandbox.txt
+++ b/examples/sandbox.txt
@@ -47,7 +47,7 @@ fib 8
 
 (𝑌 λ f x: (≤ x 1) x (+ (f (- x 1)) (f (- x 2)))) 10
 
-
+((((( ((((( 1 ))))) )))))
 
 
 
diff --git a/handle_file.c b/handle_file.c
index e69de29..59fc371 100644
--- a/handle_file.c
+++ b/handle_file.c
@@ -0,0 +1,179 @@
+
+#include <assert.h>
+
+#include <debug.h>
+
+#include <string/new.h>
+#include <string/free.h>
+
+#include <stringtree/println.h>
+#include <stringtree/free.h>
+
+/*#include <booleans/new.h>*/
+/*#include <booleans/free.h>*/
+
+/*#include <color_factory/new.h>*/
+/*#include <color_factory/free.h>*/
+
+/*#include <environment/new.h>*/
+/*#include <environment/declare_builtins.h>*/
+/*#include <environment/free.h>*/
+
+#include <parse/position/struct.h>
+#include <parse/position/new.h>
+#include <parse/position/free.h>
+
+#include <parse/istream/string/new.h>
+#include <parse/istream/file/new.h>
+#include <parse/istream/read.h>
+#include <parse/istream/free.h>
+
+#include <parse/wcistream/istream/new.h>
+#include <parse/wcistream/read.h>
+#include <parse/wcistream/free.h>
+
+#include <parse/token/struct.h>
+
+#include <parse/tokenizer/struct.h>
+#include <parse/tokenizer/new.h>
+#include <parse/tokenizer/next.h>
+#include <parse/tokenizer/free.h>
+
+#include <parse/parse.h>
+
+#include <wcostream/ostream/new.h>
+#include <wcostream/free.h>
+
+#include <ostream/file/new.h>
+#include <ostream/free.h>
+
+#include <statement/prettyprint.h>
+
+#include <statement/execute.h>
+#include <statement/prettyprint_errors.h>
+#include <statement/free.h>
+
+#include "handle_file.h"
+
+void handle_file(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory,
+    const char* input_file,
+    bool echo,
+    bool print_with_colors)
+{
+    ENTER;
+    
+    dpvs(input_file);
+    
+    assert(input_file);
+    
+    struct ostream* b_stdout = new_file_ostream(
+        /* file descriptor: */ 1);
+    
+    struct wcostream* wc_stdout = new_ostream_wcostream(
+        /* binary stream: */ b_stdout);
+    
+    struct istream* stream = new_file_istream(
+        /* path: */ input_file);
+    
+    struct wcistream* wcstream = new_istream_wcistream(
+        /* binary stream: */ stream);
+    
+    struct string* filename = new_string_from_ascii(
+        /* data: */ input_file,
+        /* len: */ (size_t) -1);
+    
+    struct position* position = new_position(
+        /* filename: */ filename,
+        /* line number: */ 1,
+        /* column: */ 1);
+    
+    struct tokenizer* tokenizer = new_tokenizer(
+        /* wide-character stream: */ wcstream,
+        /* inital position (mutated): */ position);
+    
+    istream_read(stream);
+    
+    wcistream_read(wcstream);
+    
+    tokenizer_next(tokenizer);
+    
+    while (tokenizer->token->kind == tk_newline)
+    {
+        tokenizer_next(tokenizer);
+    }
+    
+    if (tokenizer->token->kind == tk_EOF)
+    {
+        // error: empty file
+        TODO;
+    }
+    
+    while (tokenizer->token->kind != tk_EOF)
+    {
+        struct statement* statement = parse(
+            /* tokenizer: */ tokenizer);
+        
+        struct stringtree* error_messages =
+            statement_prettyprint_errors(statement);
+        
+        if (error_messages)
+        {
+            // print one (or more) error expressions
+            TODO;
+            
+            // exit(1);
+            TODO;
+        }
+        
+        if (echo)
+        {
+            struct stringtree* stree = statement_prettyprint(
+                /* chosen color reference: */ NULL,
+                /* instance: */ statement,
+                /* color factory: */ cfactory,
+                /* print with color? */ print_with_colors);
+            
+            stringtree_println(stree, wc_stdout);
+            
+            free_stringtree(stree);
+        }
+        
+        statement_execute(
+            /* instance: */ statement,
+            /* environment: */ environment,
+            /* booleans: */ booleans,
+            /* color factory: */ cfactory,
+            /* wide-character stdout: */ wc_stdout,
+            /* print value: */ true,
+            /* print with color?: */ print_with_colors);
+        
+        while (tokenizer->token->kind == tk_newline)
+        {
+            tokenizer_next(tokenizer);
+        }
+        
+        free_stringtree(error_messages);
+        
+        free_statement(statement);
+    }
+    
+    free_tokenizer(tokenizer);
+    
+    free_position(position);
+    
+    free_string(filename);
+    
+    free_wcostream(wc_stdout);
+    
+    free_wcistream(wcstream);
+    
+    free_istream(stream);
+    
+    free_ostream(b_stdout);
+    
+    EXIT;
+}
+
diff --git a/handle_file.h b/handle_file.h
index e69de29..5d92d56 100644
--- a/handle_file.h
+++ b/handle_file.h
@@ -0,0 +1,10 @@
+
+void handle_file(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory,
+    const char* input_file,
+    bool echo,
+    bool isatty);
+
+
diff --git a/handle_interactive.c b/handle_interactive.c
index e69de29..15e4e7d 100644
--- a/handle_interactive.c
+++ b/handle_interactive.c
@@ -0,0 +1,437 @@
+
+#include <assert.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include <debug.h>
+
+#include <memory/smalloc.h>
+#include <memory/srealloc.h>
+
+#include "handle_interactive.h"
+
+static const enum state {
+    s_error,
+    
+    s_EOT,
+    
+    s_delete,
+    
+    s_backspace,
+    
+    s_insert_letter,
+    
+    s_up,
+    s_down,
+    s_right,
+    s_left,
+    
+    s_home,
+    s_end,
+    
+    s_start,
+    
+    s_esc,
+    s_csi,
+    
+    number_of_states,
+} lookup[number_of_states][256] = {
+    [s_start][0x04] = s_EOT,
+    
+    [s_start][0x7F] = s_backspace,
+    
+    [s_start]['0' ... '9'] = s_insert_letter,
+    [s_start]['a' ... 'z'] = s_insert_letter,
+    [s_start]['A' ... 'Z'] = s_insert_letter,
+    
+    [s_start][0x1B] = s_esc,
+        [s_esc]['['] = s_csi,
+    [s_start][0x9B] = s_csi,
+        [s_csi]['3'] = s_delete,
+        
+        [s_csi]['A'] = s_up,
+        [s_csi]['B'] = s_down,
+        [s_csi]['C'] = s_right,
+        [s_csi]['D'] = s_left,
+        
+        [s_csi]['H'] = s_home,
+        [s_csi]['F'] = s_end,
+};
+
+void handle_interactive(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory)
+{
+    ENTER;
+    
+    struct termios termios;
+    
+    if (tcgetattr(/* fd: */ 1, /* struct termios: */ &termios) < 0)
+    {
+        TODO;
+        exit(1);
+    }
+    
+    struct termios original = termios;
+    
+    termios.c_lflag &= ~(unsigned) ICANON; // disable ICANON.
+    termios.c_lflag &= ~(unsigned) ECHO; // disable ECHO.
+    
+    if (tcsetattr(/* fd: */ 1, /* when?: */ TCSADRAIN, /* struct termios: */ &termios) < 0)
+    {
+        TODO;
+        exit(1);
+    }
+    
+    size_t width = 50;
+    
+    enum state state = s_start;
+    
+    struct letter {
+        wchar_t code;
+        
+        struct {
+            uint8_t r, g, b;
+        } fg, bg;
+    };
+    
+    struct {
+        struct letter* data;
+        
+        size_t pos, cap;
+    } live = {};
+    
+    {
+        live.data = smalloc(sizeof(*live.data) * width);
+        
+        live.cap = width;
+        
+        memset(live.data, 0, sizeof(*live.data) * width);
+    }
+    
+    struct {
+        struct letter* data;
+        
+        size_t pos, n, cap;
+    } line = {};
+    
+    void ensure_capacity(
+        size_t newcap)
+    {
+        while (line.cap < newcap)
+        {
+            line.cap = line.cap << 1 ?: 1;
+            
+            line.data = srealloc(line.data, sizeof(*line.data) * line.cap);
+        }
+    }
+    
+    void remove_from_line_at_pos(void)
+    {
+        assert(line.pos <= line.n);
+        
+        memmove(
+            /* dest: */ line.data + line.pos,
+            /* src: */ line.data + line.pos + 1,
+            /* n: */ sizeof(*line.data) * (line.n - line.pos - 1));
+        
+        line.n--;
+    }
+    
+    void insert_into_line_at_pos(
+        wchar_t code)
+    {
+        assert(line.pos <= line.n);
+        
+        ensure_capacity(line.cap + 1);
+        
+        memmove(
+            /* dest: */ line.data + line.pos + 1,
+            /* src: */ line.data + line.pos,
+            /* n: */ sizeof(*line.data) * (line.n - line.pos));
+        
+        struct letter letter = {
+            .code = code,
+            .fg = {255, 255, 255},
+            .bg = {  0,   0,   0},
+        };
+        
+        line.data[line.pos] = letter;
+        
+        line.n++;
+    }
+    
+    void redraw(void)
+    {
+        size_t pos = live.pos;
+        
+        assert(line.n <= width);
+        
+        size_t i = 0;
+        
+        for (; i < width; i++)
+        {
+            struct letter* intended_letter = i < line.n ? &line.data[i] : &(struct letter) {.code = ' '};
+            
+            struct letter* live_letter = &live.data[i];
+            
+            if (intended_letter->code != live_letter->code)
+            {
+                if (pos != i)
+                {
+                    printf("\e[%zuG", i + 1); // Move cursor to indicated column in current row.
+                    pos = i;
+                }
+                
+                printf("%c", (uint8_t) intended_letter->code);
+                
+                live_letter->code = intended_letter->code;
+                
+                pos++;
+            }
+        }
+        
+        if (pos != line.pos)
+        {
+            printf("\e[%zuG", line.pos + 1); // Move cursor to indicated column in current row.
+            
+            live.pos = pos;
+        }
+        
+        fflush(stdout);
+    }
+    
+    struct {
+        uint8_t* data;
+        size_t n, cap;
+    } token = {};
+    
+    void append(uint8_t byte)
+    {
+        if (token.n == token.cap)
+        {
+            token.cap = token.cap << 1 ?: 1;
+            
+            token.data = srealloc(token.data, sizeof(*token.data) * token.cap);
+        }
+        
+        token.data[token.n++] = byte;
+    }
+    
+    void prettyprint_token(void)
+    {
+        puts("");
+        puts("prettyprint_token:");
+        
+        for (size_t i = 0; i < token.n; i++)
+        {
+            switch (token.data[i])
+            {
+                case '\e':
+                    printf("[%zu] = '\\e'\n", i);
+                    break;
+                
+                case '\n':
+                    printf("[%zu] = '\\n'\n", i);
+                    break;
+                
+                default:
+                    printf("[%zu] = '%c' (0x%02hhX)\n", i, token.data[i], token.data[i]);
+                    break;
+            }
+        }
+        
+        fflush(stdout);
+    }
+    
+    uint8_t buffer[4096];
+    
+    for (bool keep_going = true, error = false; !error && keep_going; )
+    {
+        ssize_t retval = read(0, buffer, sizeof(buffer));
+        
+        if (retval < 0)
+        {
+            TODO;
+        }
+        else if (!retval)
+        {
+            TODO;
+        }
+        else for (ssize_t i = 0; i < retval; i++)
+        {
+            state = lookup[state][buffer[i]];
+            
+            append(buffer[i]);
+            
+            if (state < s_start)
+            {
+                switch (state)
+                {
+                    case s_error:
+                    {
+                        prettyprint_token();
+                        
+                        exit(1);
+                        
+                        break;
+                    }
+                    
+                    case s_EOT:
+                    {
+                        keep_going = false;
+                        
+                        break;
+                    }
+                    
+                    case s_backspace:
+                    {
+                        if (0 < line.pos)
+                        {
+                            line.pos--;
+                            
+                            remove_from_line_at_pos();
+                            
+                            redraw();
+                        }
+                        
+                        break;
+                    }
+                    
+                    case s_delete:
+                    {
+                        if (line.pos < line.n)
+                        {
+                            remove_from_line_at_pos();
+                            
+                            redraw();
+                        }
+                        
+                        break;
+                    }
+                    
+                    case s_insert_letter:
+                    {
+                        insert_into_line_at_pos(buffer[i]), line.pos++;
+                        
+                        redraw();
+                        
+                        break;
+                    }
+                    
+                    case s_up:
+                        break;
+                    
+                    case s_down:
+                        break;
+                    
+                    case s_right:
+                    {
+                        if (line.pos < line.n)
+                        {
+                            line.pos++;
+                            
+                            redraw();
+                        }
+                        
+                        break;
+                    }
+                    
+                    case s_left:
+                    {
+                        if (0 < line.pos)
+                        {
+                            line.pos--;
+                            
+                            redraw();
+                        }
+                        
+                        break;
+                    }
+                    
+                    case s_home:
+                    {
+                        line.pos = 0;
+                        
+                        redraw();
+                        
+                        break;
+                    }
+                    
+                    case s_end:
+                    {
+                        line.pos = line.n;
+                        
+                        redraw();
+                        
+                        break;
+                    }
+                    
+                    default:
+                    {
+                        prettyprint_token();
+                        
+                        exit(1);
+                        break;
+                    }
+                }
+                
+                state = s_start;
+                token.n = 0;
+            }
+        }
+    }
+    
+    // running them through a tokenizer-like state machine?
+    
+    // different states have corasponding actions
+    
+    if (tcsetattr(/* fd: */ 1, /* when?: */ TCSADRAIN, /* struct termios: */ &original) < 0)
+    {
+        TODO;
+        exit(1);
+    }
+    
+    free(line.data);
+    
+    EXIT;
+}
+
+#if 0
+
+// maybe this should go into it's own file, because it's complicated \
+   beyond parsing and executing the expression.
+    // maintain the line as a character array
+    // whenever there's a mutation, re-parse
+    // if the text is empty:
+        // grey the prompt
+    // the input will never contain a newline, it might contain a semicolon
+    // color the expression \
+        which will color the tokens \
+            maybe set all tokens to grey first?
+    // redraw the input line with colored tokens
+    // the parse will come back happy or unhappy:
+        // if happy:
+            // make the prompt green
+        // if unhappy:
+            // make prompt red
+            // for all found 'syntax error' expressions:
+                // print it's message on a new line, offset at the position \
+                   of the incedent.
+    // if the user hits enter:
+        // ... on an empty prompt:
+            // new line, redraw grey prompt.
+        // ... on an unhappy expression:
+            // maybe blink the error messages?
+        // ... on a happy expression:
+            // new line
+            // evaluate
+            // '${id} = ' print result
+            // new line
+            // grey the prompt.
+            // increment line number
+            // save the result into '${id++}'
+            // free result
+#endif
+
diff --git a/handle_interactive.h b/handle_interactive.h
index e69de29..df1604e 100644
--- a/handle_interactive.h
+++ b/handle_interactive.h
@@ -0,0 +1,10 @@
+
+struct environment;
+struct booleans;
+struct color_factory;
+
+void handle_interactive(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory);
+
diff --git a/handle_string.c b/handle_string.c
index e69de29..ccbe90f 100644
--- a/handle_string.c
+++ b/handle_string.c
@@ -0,0 +1,189 @@
+
+#include <assert.h>
+
+#include <debug.h>
+
+#include <string/new.h>
+#include <string/free.h>
+
+#include <stringtree/println.h>
+#include <stringtree/free.h>
+
+/*#include <booleans/new.h>*/
+/*#include <booleans/free.h>*/
+
+/*#include <color_factory/new.h>*/
+/*#include <color_factory/free.h>*/
+
+/*#include <environment/new.h>*/
+/*#include <environment/declare_builtins.h>*/
+/*#include <environment/free.h>*/
+
+#include <parse/position/struct.h>
+#include <parse/position/new.h>
+#include <parse/position/free.h>
+
+#include <parse/istream/string/new.h>
+#include <parse/istream/file/new.h>
+#include <parse/istream/read.h>
+#include <parse/istream/free.h>
+
+#include <parse/wcistream/istream/new.h>
+#include <parse/wcistream/read.h>
+#include <parse/wcistream/free.h>
+
+#include <parse/token/struct.h>
+
+#include <parse/tokenizer/struct.h>
+#include <parse/tokenizer/new.h>
+#include <parse/tokenizer/next.h>
+#include <parse/tokenizer/free.h>
+
+#include <parse/parse.h>
+
+#include <wcostream/ostream/new.h>
+#include <wcostream/free.h>
+
+#include <ostream/file/new.h>
+#include <ostream/free.h>
+
+#include <statement/prettyprint.h>
+
+#include <statement/execute.h>
+#include <statement/prettyprint_errors.h>
+#include <statement/free.h>
+
+#include "handle_string.h"
+
+void handle_string(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory,
+    const char* input_string,
+    bool echo,
+    bool print_with_colors)
+{
+    ENTER;
+    
+    assert(input_string);
+    
+    struct ostream* b_stdout = new_file_ostream(
+        /* file descriptor: */ 1);
+    
+    struct wcostream* wc_stdout = new_ostream_wcostream(
+        /* binary stream: */ b_stdout);
+    
+    struct istream* stream = new_string_istream(
+        /* read-only text: */ (const uint8_t*) input_string);
+    
+    struct wcistream* wcstream = new_istream_wcistream(
+        /* binary stream: */ stream);
+    
+    struct string* filename = new_string(
+        /* data: */ L"<command-line>",
+        /* len: */ (size_t) -1);
+    
+    struct position* position = new_position(
+        /* filename: */ filename,
+        /* line number: */ 1,
+        /* column: */ 1);
+    
+    struct tokenizer* tokenizer = new_tokenizer(
+        /* stream: */ wcstream,
+        /* inital position (mutated): */ position);
+    
+    istream_read(stream);
+    
+    wcistream_read(wcstream);
+    
+    tokenizer_next(tokenizer);
+    
+    if (tokenizer->token->kind == tk_EOF)
+    {
+        // error: empty file
+        TODO;
+    }
+    
+    while (tokenizer->token->kind != tk_EOF)
+    {
+        struct statement* statement = parse(
+            /* tokenizer: */ tokenizer);
+        
+        struct stringtree* error_messages =
+            statement_prettyprint_errors(statement);
+        
+        if (error_messages)
+        {
+            // print one (or more) error expressions
+            TODO;
+            
+            // exit(1);
+            TODO;
+        }
+        
+        if (echo)
+        {
+            struct stringtree* stree = statement_prettyprint(
+                /* chosen color reference: */ NULL,
+                /* instance: */ statement,
+                /* color factory: */ cfactory,
+                /* print with color? */ print_with_colors);
+            
+            stringtree_println(stree, wc_stdout);
+            
+            free_stringtree(stree);
+        }
+        
+        statement_execute(
+            /* instance: */ statement,
+            /* environment: */ environment,
+            /* booleans: */ booleans,
+            /* color factory: */ cfactory,
+            /* wide-character stdout: */ wc_stdout,
+            /* print value: */ true,
+            /* print with color?: */ print_with_colors);
+        
+        while (tokenizer->token->kind == tk_newline)
+        {
+            tokenizer_next(tokenizer);
+        }
+        
+        free_stringtree(error_messages);
+        
+        free_statement(statement);
+    }
+    
+    free_tokenizer(tokenizer);
+    
+    free_position(position);
+    
+    free_string(filename);
+    
+    free_wcostream(wc_stdout);
+    
+    free_wcistream(wcstream);
+    
+    free_istream(stream);
+    
+    free_ostream(b_stdout);
+    
+    EXIT;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/handle_string.h b/handle_string.h
index e69de29..94c9f6d 100644
--- a/handle_string.h
+++ b/handle_string.h
@@ -0,0 +1,13 @@
+
+struct color_factory;
+struct environment;
+struct booleans;
+
+void handle_string(
+    struct environment** environment,
+    struct booleans* booleans,
+    struct color_factory* cfactory,
+    const char* input_file,
+    bool echo,
+    bool print_with_colors);
+
diff --git a/main.c b/main.c
index e069991..0029ed8 100644
--- a/main.c
+++ b/main.c
@@ -9,12 +9,6 @@
 #include <cmdln/new.h>
 #include <cmdln/free.h>
 
-#include <string/new.h>
-#include <string/free.h>
-
-#include <stringtree/println.h>
-#include <stringtree/free.h>
-
 #include <booleans/new.h>
 #include <booleans/free.h>
 
@@ -25,42 +19,16 @@
 #include <environment/declare_builtins.h>
 #include <environment/free.h>
 
-#include <parse/position/struct.h>
-#include <parse/position/new.h>
-#include <parse/position/free.h>
-
-#include <parse/istream/string/new.h>
-#include <parse/istream/file/new.h>
-#include <parse/istream/read.h>
-#include <parse/istream/free.h>
-
-#include <parse/wcistream/istream/new.h>
-#include <parse/wcistream/read.h>
-#include <parse/wcistream/free.h>
-
-#include <parse/token/struct.h>
-
-#include <parse/tokenizer/struct.h>
-#include <parse/tokenizer/new.h>
-#include <parse/tokenizer/next.h>
-#include <parse/tokenizer/free.h>
-
-#include <parse/parse.h>
-
-#include <wcostream/ostream/new.h>
-#include <wcostream/free.h>
-
-#include <ostream/file/new.h>
-#include <ostream/free.h>
-
-#include <statement/prettyprint.h>
-
-#include <statement/execute.h>
-#include <statement/prettyprint_errors.h>
-#include <statement/free.h>
-
 #include <handle_init_file.h>
 
+#include <handle_string.h>
+#include <handle_file.h>
+#include <handle_interactive.h>
+
+/*/ python
+print("static int x = 3;");
+/*/
+
 int main(int argc, char* const* argv)
 {
     ENTER;
@@ -80,8 +48,6 @@ int main(int argc, char* const* argv)
     
     if (flags->read_init_file)
     {
-        dpvs(flags->custom_init_path);
-        
         handle_init_file(&environment, booleans, flags->custom_init_path);
     }
     
@@ -89,246 +55,43 @@ int main(int argc, char* const* argv)
     {
         case ik_string:
         {
-            TODO;
-            #if 0
-            assert(flags->input_string);
+            handle_string(
+                /* environment, may by modified/replaced: */ &environment,
+                /* booleans: */ booleans,
+                /* colors: */ cfactory,
+                /* input string: */ flags->input_string,
+                /* echo? */ flags->echo,
+                /* colors?: */ flags->print_with_colors);
             
-            struct istream* stream = new_string_istream(
-                /* read-only text: */ (const uint8_t*) flags->input_string);
-            
-            struct string* filename = new_string(
-                /* data: */ (const uint8_t*) "<command-line>",
-                /* len: */ (size_t) -1);
-            
-            struct position* position = new_position(
-                /* filename: */ filename,
-                /* line number: */ 1,
-                /* column: */ 1);
-            
-            struct tokenizer* tokenizer = new_tokenizer(
-                /* stream: */ stream,
-                /* inital position (mutated): */ position);
-            
-            istream_read(stream);
-            
-            tokenizer_next(tokenizer);
-            
-            if (tokenizer->token->kind == tk_EOF)
-            {
-                // error: empty file
-                TODO;
-            }
-            
-            struct environment* environment = new_environment(
-                /* fallback: */ NULL);
-            
-            environment_declare_builtins(
-                /* this: */ environment);
-            
-            while (tokenizer->token->kind != tk_EOF)
-            {
-                struct statement* statement = parse(
-                    /* tokenizer: */ tokenizer);
-                
-                struct stringtree* error_messages =
-                    statement_prettyprint_errors(statement);
-                
-                if (error_messages)
-                {
-                    // print one (or more) error expressions
-                    TODO;
-                    
-                    // exit(1);
-                    TODO;
-                }
-                
-                if (flags->echo)
-                {
-                    struct stringtree* stree = statement_prettyprint(
-                        /* instance: */ statement,
-                        /* color factory: */ cfactory,
-                        /* precedence level: */ 0);
-                    
-                    stringtree_println(stree);
-                    
-                    free_stringtree(stree);
-                }
-                
-                statement_execute(
-                    /* instance: */ statement,
-                    /* environment: */ environment,
-                    /* color factory: */ cfactory,
-                    /* print value: */ true);
-                
-                free_stringtree(error_messages);
-                
-                free_statement(statement);
-            }
-            
-            free_environment(environment);
-            
-            free_tokenizer(tokenizer);
-            
-            free_position(position);
-            
-            free_string(filename);
-            
-            free_istream(stream);
-            #endif
             break;
         }
         
         case ik_file:
         {
-            dpvs(flags->input_file);
-            
-            assert(flags->input_file);
-            
-            struct ostream* b_stdout = new_file_ostream(
-                /* file descriptor: */ 1);
-            
-            struct wcostream* wc_stdout = new_ostream_wcostream(
-                /* binary stream: */ b_stdout);
-            
-            struct istream* stream = new_file_istream(
-                /* path: */ flags->input_file);
-            
-            struct wcistream* wcstream = new_istream_wcistream(
-                /* binary stream: */ stream);
-            
-            struct string* filename = new_string_from_ascii(
-                /* data: */ flags->input_file,
-                /* len: */ (size_t) -1);
-            
-            struct position* position = new_position(
-                /* filename: */ filename,
-                /* line number: */ 1,
-                /* column: */ 1);
-            
-            struct tokenizer* tokenizer = new_tokenizer(
-                /* wide-character stream: */ wcstream,
-                /* inital position (mutated): */ position);
-            
-            istream_read(stream);
-            
-            wcistream_read(wcstream);
-            
-            tokenizer_next(tokenizer);
-            
-            while (tokenizer->token->kind == tk_newline)
-            {
-                tokenizer_next(tokenizer);
-            }
-            
-            if (tokenizer->token->kind == tk_EOF)
-            {
-                // error: empty file
-                TODO;
-            }
-            
-            while (tokenizer->token->kind != tk_EOF)
-            {
-                struct statement* statement = parse(
-                    /* tokenizer: */ tokenizer);
-                
-                struct stringtree* error_messages =
-                    statement_prettyprint_errors(statement);
-                
-                if (error_messages)
-                {
-                    // print one (or more) error expressions
-                    TODO;
-                    
-                    // exit(1);
-                    TODO;
-                }
-                
-                if (flags->echo)
-                {
-                    struct stringtree* stree = statement_prettyprint(
-                        /* chosen color reference: */ NULL,
-                        /* instance: */ statement,
-                        /* color factory: */ cfactory,
-                        /* print with color? */ flags->rainbow);
-                    
-                    stringtree_println(stree, wc_stdout);
-                    
-                    free_stringtree(stree);
-                }
-                
-                statement_execute(
-                    /* instance: */ statement,
-                    /* environment: */ &environment,
-                    /* booleans: */ booleans,
-                    /* color factory: */ cfactory,
-                    /* wide-character stdout: */ wc_stdout,
-                    /* print value: */ true,
-                    /* print with color?: */ flags->rainbow);
-                
-                while (tokenizer->token->kind == tk_newline)
-                {
-                    tokenizer_next(tokenizer);
-                }
-                
-                free_stringtree(error_messages);
-                
-                free_statement(statement);
-            }
-            
-            free_tokenizer(tokenizer);
-            
-            free_position(position);
-            
-            free_string(filename);
-            
-            free_wcostream(wc_stdout);
-            
-            free_wcistream(wcstream);
-            
-            free_istream(stream);
-            
-            free_ostream(b_stdout);
+            handle_file(
+                /* environment, may by modified/replaced: */ &environment,
+                /* booleans: */ booleans,
+                /* colors: */ cfactory,
+                /* input file: */ flags->input_file,
+                /* echo? */ flags->echo,
+                /* colors?: */ flags->print_with_colors);
             
             break;
         }
         
         case ik_interactive:
         {
-            TODO;
+            if (!isatty(1))
+            {
+                TODO;
+                exit(1);
+            }
+            
+            handle_interactive(
+                /* environment, may by modified/replaced: */ &environment,
+                /* booleans: */ booleans,
+                /* colors: */ cfactory);
             
-            // maybe this should go into it's own file, because it's complicated \
-               beyond parsing and executing the expression.
-                // maintain the line as a character array
-                // whenever there's a mutation, re-parse
-                // if the text is empty:
-                    // grey the prompt
-                // the input will never contain a newline, it might contain a semicolon
-                // color the expression \
-                    which will color the tokens \
-                        maybe set all tokens to grey first?
-                // redraw the input line with colored tokens
-                // the parse will come back happy or unhappy:
-                    // if happy:
-                        // make the prompt green
-                    // if unhappy:
-                        // make prompt red
-                        // for all found 'syntax error' expressions:
-                            // print it's message on a new line, offset at the position \
-                               of the incedent.
-                // if the user hits enter:
-                    // ... on an empty prompt:
-                        // new line, redraw grey prompt.
-                    // ... on an unhappy expression:
-                        // maybe blink the error messages?
-                    // ... on a happy expression:
-                        // new line
-                        // evaluate
-                        // '${id} = ' print result
-                        // new line
-                        // grey the prompt.
-                        // increment line number
-                        // save the result into '${id++}'
-                        // free result
             break;
         }
         
diff --git a/makefile b/makefile
index e58d0de..42934c2 100644
--- a/makefile
+++ b/makefile
@@ -24,29 +24,40 @@ endif
 	@mkdir -p $@
 
 srclist.mk:
-	find -name '*.c' -! -path '*/junk/*' | sed "s/^/srcs += /" | sort -V > ${@}
+	find -name '*.c' -! -path '*/bin/*'-! -path '*/junk/*' | sed "s/^/srcs += /" | sort -V > ${@}
 
 include srclist.mk
 
-${prefix}/%.o ${prefix}/%.d: %.c ${optionset} | ${prefix}/%/
-	@echo "compiling (${buildtype}) ${<} ..."
-	@gcc -c @${optionset} $< -MD -MF ${prefix}/${*}.d -o ${prefix}/${*}.o $(on_error_command)
+#postsrcs = $(patsubst %,bin/%.c,${srcs})
+
+.PRECIOUS: bin/%.c.c
+
+bin/%.c.c: %.c zog.py | bin/%/
+	@echo "preprocessing ${<} ..."
+	@python3.10 ./zog.py -i $< -o $@
+
+${prefix}/%.o ${prefix}/%.d: bin/%.c.c ${optionset} | ${prefix}/%/
+	@echo "compiling (${buildtype}) ${*}.c ..."
+	@gcc -c @${optionset} -I $(*D) $< -MD -MF ${prefix}/${*}.d -o ${prefix}/${*}.o
+
+# $(on_error_command)
 
 objs = $(patsubst %.c,${prefix}/%.o,${srcs})
 
-${prefix}/13: ${objs} ${optionset} | ${prefix}/${1}/
-	@echo "linking (${buildtype}) ${1}"
+${prefix}/13: ${objs} ${optionset} | ${prefix}/
+	@echo "linking (${buildtype})"
 	@gcc @${optionset} ${objs} -o ${@} -lm
 
-#args += --echo
-args += --echo-rainbow
+args += --echo
+args += --color
+
 #args += --no-init
 
 args += --custom-init-path ./examples/init.txt
 
-#args += -c '1'
+args += -c '1'
 
-args += ./examples/sandbox.txt
+#args += ./examples/sandbox.txt
 
 run: ${prefix}/13
 	$< ${args}
diff --git a/memory/smalloc.c b/memory/smalloc.c
index 8d5de92..5a53fa3 100644
--- a/memory/smalloc.c
+++ b/memory/smalloc.c
@@ -2,24 +2,17 @@
 #include <assert.h>
 #include <stdlib.h>
 
-#include <debug.h>
-
 #include "smalloc.h"
 
 void* smalloc(size_t size)
 {
-    ENTER;
-    
-    dpvlu(size);
-    
     void* ptr = malloc(size);
     
     if (!ptr)
     {
-        TODO;
+        assert(!"TODO");
     }
     
-    EXIT;
     return ptr;
 }
 
diff --git a/memory/srealloc.c b/memory/srealloc.c
index c5f442c..8b7673b 100644
--- a/memory/srealloc.c
+++ b/memory/srealloc.c
@@ -2,24 +2,19 @@
 #include <assert.h>
 #include <stdlib.h>
 
-#include <debug.h>
-
 #include "srealloc.h"
 
 void* srealloc(
     void* oldptr,
     size_t size)
 {
-    ENTER;
-    
     void* newptr = realloc(oldptr, size);
     
     if (!newptr)
     {
-        TODO;
+        assert(!"TODO");
     }
     
-    EXIT;
     return newptr;
 }
 
diff --git a/parse/istream/string/free.c b/parse/istream/string/free.c
index 0b1db36..f8d1d39 100644
--- a/parse/istream/string/free.c
+++ b/parse/istream/string/free.c
@@ -12,10 +12,6 @@ void free_string_istream(
 {
     ENTER;
     
-/*    struct string_istream* this = (void*) super;*/
-    
-    TODO;
-    
     EXIT;
 }
 
diff --git a/zog.py b/zog.py
new file mode 100755
index 0000000..c894a7d
--- /dev/null
+++ b/zog.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3.10
+
+import sys;
+import io;
+
+input_file = None;
+
+output_file = None;
+
+snippet_directory = "/tmp"
+
+i = 1;
+n = len(sys.argv);
+
+while i < n:
+    arg = sys.argv[i];
+    
+    match arg:
+        case "-i":
+            input_file = sys.argv[i + 1]
+            i += 2;
+        
+        case "-o":
+            output_file = sys.argv[i + 1]
+            i += 2;
+        
+        case "-s":
+            snippet_directory = sys.argv[i + 1]
+            i += 2;
+        
+        case _:
+            assert(not "TODO");
+
+if (not input_file) or (not output_file):
+    assert(not "TODO");
+
+while input_file.startswith("./"):
+    input_file = input_file[2:];
+
+while snippet_directory.startswith("./"):
+    snippet_directory = snippet_directory[2:];
+
+while snippet_directory.endswith("/"):
+    snippet_directory = snippet_directory[:-1];
+
+myglobals = dict();
+
+istream = open(input_file, "r");
+ostream = open(output_file, "w");
+
+lines = istream.readlines();
+
+i = 0;
+n = len(lines);
+
+while i < n:
+    if "/*/" in lines[i]:
+        i += 1;
+        start_index = i;
+        
+        while "/*/" not in lines[i]:
+            i += 1;
+            
+        end_index = i;
+        i += 1;
+        
+        source = "".join(lines[start_index:end_index]);
+        
+        real_stdout = sys.stdout
+        sys.stdout = captured_stdout = io.StringIO()
+        eval(compile(source, "<cog-snippet>", "exec"), myglobals);
+        sys.stdout = real_stdout
+        
+        outstring = captured_stdout.getvalue();
+        
+        if outstring and outstring[-1] != "\n":
+            outstring += "\n"
+        
+        temppath = f"{snippet_directory}/{input_file}-{start_index}.c";
+        
+        with open(temppath, "w") as stream:
+            stream.write(outstring);
+        
+        ostream.write(f'#include "{temppath}"' + "\n");
+        ostream.write("\n" * (end_index - start_index + 1));
+    else:
+        ostream.write(lines[i]);
+        i += 1;
+
+istream.close();
+ostream.close();
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+