basic navigation kinda works most of the time

4ed_file_view.cpp

@@ -393,15 +393,36 @@ view_compute_cursor(View *view, Buffer_Seek seek){
     Buffer_Cursor_Seek_Params params;
     params.buffer        = &file->state.buffer;
     params.seek          = seek;
-    params.max_width     = view_file_display_width(view);
+    params.width         = view_file_display_width(view);
     params.font_height   = (f32)font->height;
     params.adv           = font->advance_data;
     params.wraps         = file->state.wraps;
-    params.virtual_white = 0;
+    params.virtual_white = 1;
     
     Buffer_Cursor_Seek_State state = {0};
     Full_Cursor result;
-    buffer_cursor_seek(&state, params, 0, &result);
+    Buffer_Layout_Stop stop;
+    
+    f32 edge_tolerance = 50.f;
+    if (edge_tolerance > params.width){
+        edge_tolerance = params.width;
+    }
+    
+    f32 line_shift = 0.f;
+    do{
+        f32 this_line_shift = line_shift;
+        if (this_line_shift > params.width - edge_tolerance){
+            this_line_shift = params.width - edge_tolerance;
+        }
+        
+        stop = buffer_cursor_seek(&state, params, this_line_shift, &result);
+        switch (stop.status){
+            case BLStatus_NeedWrapLineShift:
+            case BLStatus_NeedLineShift:
+            line_shift = (stop.line_index%4)*9.f;
+            break;
+        }
+    }while(stop.status != BLStatus_Finished);
     
     return(result);
 }
@@ -4758,17 +4779,12 @@ draw_file_loaded(View *view, i32_Rect rect, b32 is_active, Render_Target *target
         Buffer_Render_State state = {0};
         Buffer_Layout_Stop stop;
         
-        f32 line_shift = (render_cursor.line%4)*15.f + 30.f;
-        while (line_shift >= 60.f){
-            line_shift -= 60.f;
-        }
-        
         f32 edge_tolerance = 50.f;
-        
         if (edge_tolerance > params.width){
             edge_tolerance = params.width;
         }
         
+        f32 line_shift = 0.f;
         do{
             f32 this_line_shift = line_shift;
             if (this_line_shift > params.width - edge_tolerance){
@@ -4779,10 +4795,7 @@ draw_file_loaded(View *view, i32_Rect rect, b32 is_active, Render_Target *target
             switch (stop.status){
                 case BLStatus_NeedWrapLineShift:
                 case BLStatus_NeedLineShift:
-                line_shift += 15.f;
+                line_shift = (stop.line_index%4)*9.f;
-                if (line_shift >= 60.f){
-                    line_shift -= 60.f;
-                }
                 break;
             }
         }while(stop.status != BLStatus_Finished);

buffer/4coder_buffer_abstract.cpp

@@ -424,8 +424,12 @@ buffer_partial_from_line_character(Buffer_Type *buffer, i32 line, i32 character)
         max_character = (next_start-this_start);
     }
     
-    if (character <= 0) character = 1;
+    if (character <= 0){
-    if (character > max_character) character = max_character;
+        character = 1;
+    }
+    if (character > max_character){
+        character = max_character;
+    }
     
     result.pos = this_start + character - 1;
     result.line = line_index+1;
@@ -437,7 +441,7 @@ buffer_partial_from_line_character(Buffer_Type *buffer, i32 line, i32 character)
 struct Buffer_Cursor_Seek_Params{
     Buffer_Type *buffer;
     Buffer_Seek seek;
-    f32 max_width;
+    f32 width;
     f32 font_height;
     f32 *adv;
     f32 *wraps;
@@ -553,10 +557,10 @@ buffer_cursor_seek(Buffer_Cursor_Seek_State *S_ptr, Buffer_Cursor_Seek_Params pa
         
         S.stream.use_termination_character = 1;
         S.stream.terminator = '\n';
-        if (buffer_stringify_loop(&S.stream, params.buffer, S.i, S.size)){
+        if (buffer_stringify_loop(&S.stream, params.buffer, S.cursor.pos, S.size)){
             do{
                 for (; S.cursor.pos < S.stream.end; ++S.cursor.pos){
-                    S.ch = (u8)S.stream.data[S.i];
+                    S.ch = (u8)S.stream.data[S.cursor.pos];
                     
                     if (S.ch != ' ' && S.ch != '\t'){
                         goto double_break_vwhite;
@@ -564,10 +568,12 @@ buffer_cursor_seek(Buffer_Cursor_Seek_State *S_ptr, Buffer_Cursor_Seek_Params pa
                     else{
                         ++S.cursor.character;
                     }
+                    
                 }
                 S.still_looping = buffer_stringify_next(&S.stream);
             }while(S.still_looping);
         }
+        InvalidCodePath;
         double_break_vwhite:;
     }
     
@@ -605,9 +611,9 @@ buffer_cursor_seek(Buffer_Cursor_Seek_State *S_ptr, Buffer_Cursor_Seek_Params pa
     // Main seek loop
     S.i = S.cursor.pos;
     
+    S.stream = null_buffer_stream;
     S.stream.use_termination_character = 1;
     S.stream.terminator = 0;
-    
     if (buffer_stringify_loop(&S.stream, params.buffer, S.i, S.size)){
         S.still_looping = 0;
         do{
@@ -631,7 +637,7 @@ buffer_cursor_seek(Buffer_Cursor_Seek_State *S_ptr, Buffer_Cursor_Seek_Params pa
                     {
                         f32 ch_width = params.adv[S.ch];
                         
-                        if (S.cursor.wrapped_x + ch_width > params.max_width){
+                        if (S.cursor.wrapped_x + ch_width > params.width){
                             S.cursor.wrapped_y += params.font_height;
                             S.cursor.wrapped_x = 0;
                             S.prev_cursor = S.cursor;

buffer/4coder_gap_buffer.cpp

@@ -108,6 +108,7 @@ typedef struct Gap_Buffer_Stream{
     b32 use_termination_character;
     char terminator;
 } Gap_Buffer_Stream;
+static Gap_Buffer_Stream null_buffer_stream = {0};
 
 internal_4tech b32
 buffer_stringify_loop(Gap_Buffer_Stream *stream, Gap_Buffer *buffer, i32 start, i32 end){