Major codebase cleanup and overhaul.

+ editor removes per-buffer fields.
+ switching from internal use of 'int' to 'size_t'.
+ deleting old code
+ double checking relevancy of comments. A lot has changed in
  5 years, even more so in the past week.
+ fixing a few vestigal memory errors from the overhaul.
+ fixing search behavior

scratch.c

@@ -2,15 +2,20 @@
  * scratch.c - ideas in progress
  */
 
+#include "buffer.h"
+#include "abuf.h"
+#include <ctype.h>
+#include <string.h>
+
 #define REFLOW_MARGIN		72
 
 void
 reflow_region(void)
 {
-	int		 start_row, end_row, i, col, wlen, this_len;
-	struct erow	*row;
-	struct abuf	 buf = ABUF_INIT;
-	struct abuf	 out = ABUF_INIT;
+ int		 start_row, end_row, i, col, wlen, this_len;
+ abuf		*row;
+ struct abuf	 buf = ABUF_INIT;
+ struct abuf	 out = ABUF_INIT;
 	int		 in_paragraph = 0;
 	int		 indent_len = 0;
 	char		 indent[REFLOW_MARGIN + 1];
@@ -19,38 +24,38 @@ reflow_region(void)
 	char		*p = NULL;
 	char		*s = NULL;
 
-	if (editor.mark_set) {
-		if (editor.mark_cury < editor.cury ||
-			(editor.mark_cury == editor.cury &&
-				editor.mark_curx < editor.curx)) {
-			start_row = editor.mark_cury;
-			end_row = editor.cury;
-		} else {
-			start_row = editor.cury;
-			end_row = editor.mark_cury;
-		}
-	} else {
-		start_row = end_row = editor.cury;
-		while (start_row > 0 && editor.row[start_row - 1].size > 0) {
-			start_row--;
-		}
+ if (EMARK_SET) {
+        if (EMARK_CURY < ECURY ||
+            (EMARK_CURY == ECURY &&
+                EMARK_CURX < ECURX)) {
+            start_row = EMARK_CURY;
+            end_row = ECURY;
+        } else {
+            start_row = ECURY;
+            end_row = EMARK_CURY;
+        }
+    } else {
+        start_row = end_row = ECURY;
+        while (start_row > 0 && EROW[start_row - 1].size > 0) {
+            start_row--;
+        }
 
-		while (end_row < editor.nrows - 1 &&
-			editor.row[end_row + 1].size > 0) {
-			end_row++;
-		}
-	}
+        while (end_row < ENROWS - 1 &&
+            EROW[end_row + 1].size > 0) {
+            end_row++;
+        }
+    }
 
-	if (start_row >= editor.nrows) {
-		return;
-	}
+ if (start_row >= ENROWS) {
+        return;
+    }
 
-	if (end_row >= editor.nrows) {
-		end_row = editor.nrows - 1;
-	}
+ if (end_row >= ENROWS) {
+        end_row = ENROWS - 1;
+    }
 
-	for (i = start_row; i <= end_row; i++) {
-		row = &editor.row[i];
+ for (i = start_row; i <= end_row; i++) {
+        row = &EROW[i];
 
 		if (row->size == 0) {
 			if (in_paragraph) {
@@ -62,21 +67,21 @@ reflow_region(void)
 			continue;
 		}
 
-		if (!in_paragraph) {
-			indent_len = 0;
-			while (indent_len < row->size &&
-				(row->line[indent_len] == ' ' ||
-					row->line[indent_len] == '\t')) {
-				indent[indent_len] = row->line[indent_len], indent_len++;
-			}
+        if (!in_paragraph) {
+            indent_len = 0;
+            while (indent_len < (int)row->size &&
+                (row->b[indent_len] == ' ' ||
+                    row->b[indent_len] == '\t')) {
+                indent[indent_len] = row->b[indent_len], indent_len++;
+            }
 
-			indent[indent_len] = '\0';
-			in_paragraph = 1;
-		}
+            indent[indent_len] = '\0';
+            in_paragraph = 1;
+        }
 
-		ab_append(&buf, row->line + indent_len, row->size - indent_len);
-		ab_append(&buf, " ", 1);
-	}
+        ab_append(&buf, row->b + indent_len, row->size - indent_len);
+        ab_append(&buf, " ", 1);
+    }
 
 	if (in_paragraph) {
 		ab_append(&buf, "\n", 1);
@@ -145,18 +150,57 @@ reflow_region(void)
 	ab_free(&out);
 
 
-	for (i = end_row; i >= start_row; i--) {
-		delete_row(i);
-	}
+ for (i = end_row; i >= start_row; i--) {
+        delete_row(i);
+    }
 
-	s = buf.b;
-	while ((e = strchr(s, '\n'))) {
-		erow_insert(start_row++, s, e - s);
-		s = e + 1;
-	}
+ s = buf.b;
+ while ((e = strchr(s, '\n'))) {
+     erow_insert(start_row++, s, e - s);
+     s = e + 1;
+ }
 
 	ab_free(&buf);
 
-	editor.dirty++;
-	editor_set_status("Region reflowed to %d columns", REFLOW_MARGIN);
-}
+    EDIRTY++;
+    editor_set_status("Region reflowed to %d columns", REFLOW_MARGIN);
+}
+
+
+static inline
+void clamp_curx_to_row(void)
+{
+	abuf	*row  = NULL;
+	int	 maxx = 0;
+
+	if (ECURY >= ENROWS) {
+		return;
+	}
+
+	row = &EROW[ECURY];
+	if (ECURX < 0) {
+		ECURX = 0;
+	}
+
+	maxx = (int) row->size;
+	if (ECURX > maxx) {
+		ECURX = maxx;
+	}
+}
+
+static inline
+void set_cursor(int col, int row)
+{
+	if (row < 0) {
+		row = 0;
+	}
+
+	if (row > ENROWS) {
+		row = ENROWS;
+	}
+	
+	ECURY = row;
+	ECURX = col;
+	
+	clamp_curx_to_row();
+}