Status bar / editing / saving file

src/row_op.c

@@ -1,4 +1,56 @@
 #include "../include/row_op.h"
+#include <stdlib.h>
+#include <string.h>
+
+int editorRowCxToRx(erow *row, int cursor_x) {
+  int render_x = 0;
+  int i;
+  for (i = 0; i < cursor_x; ++i) {
+    if (row->chars[i] == '\t') {
+      render_x += (TAB_LENGTH - 1) - (render_x % TAB_LENGTH);
+    }
+    render_x++;
+  }
+  return render_x;
+}
+
+/**
+ * \fn editorUpdateRow(erow *row)
+ * \brief Copy content of \p row in \p row->render.
+ *  */
+
+void editorUpdateRow(erow *row) {
+  int i, i_render;
+  int tabs = 0;
+
+  // counting number of tabs
+
+  for (i = 0; i < row->size; ++i) {
+    tabs +=
+        (row->chars[i] == '\t'); /**< increment tabs of 1 if chars[i] is one. */
+  }
+
+  free(row->render);
+  row->render = malloc(row->size + tabs * (TAB_LENGTH - 1) +
+                       1); /**< Tabs needs TAB_LENGTH chars so TAB_LENGTH - 1
+                              more than the first already counted. */
+
+  // end of counting
+  i_render = 0;
+  for (i = 0; i < row->size; ++i) {
+    if (row->chars[i] == '\t') {
+      row->render[i_render++] = ' ';
+      while (i_render % TAB_LENGTH) {
+        row->render[i_render++] =
+            ' '; /**< Addind the right amount of spaces for tabs */
+      }
+    } else {
+      row->render[i_render++] = row->chars[i];
+    }
+  }
+  row->render[i_render] = '\0'; // Don't forget the end of string character.
+  row->rsize = i_render;
+}
 
 void editorAppendRow(struct editorConfig *E, char *s, size_t len) {
   int at;
@@ -9,5 +61,25 @@ void editorAppendRow(struct editorConfig *E, char *s, size_t len) {
   E->row[at].chars = malloc(len + 1);
   memcpy(E->row[at].chars, s, len);
   E->row[at].chars[len] = '\0';
+
+  E->row[at].rsize = 0;
+  E->row[at].render = NULL;
+  editorUpdateRow(&E->row[at]);
+
   ++E->numrows;
 }
+
+/**
+ * \fn editorRowInsertChar(erow *row, int at, int c)
+ * \param at Index of where we want to insert the char */
+
+void editorRowInsertChar(erow *row, int at, int c) {
+  if (at < 0 || at > row->size) {
+    at = row->size;
+  }
+  row->chars = realloc(row->chars, row->size + 2);
+  memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
+  ++row->size;
+  row->chars[at] = c;
+  editorUpdateRow(row);
+}