kilo

commit 40afadb33793d415717d0e7910863aba7242c148
parent fb4217ce51a604a0d05a852d9c5bd804cc359bf0
Author: Dimitrije Dobrota <mail@dimitrijedobrota.com>
Date:   Sun,  9 Apr 2023 19:46:02 +0200

Add line numbing

Diffstat:
M
kilo.c
 | 
29
+++++++++++++++++++++++++++--

1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/kilo.c b/kilo.c
@@ -7,6 +7,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -30,6 +31,20 @@
 #define CLAMP_LEFT(a, x)  ((a) = RCLAMP_LEFT(a, x))
 #define CLAMP_RIGHT(a, x) ((a) = RCLAMP_RIGHT(a, x))
 
+int numberOfDigits(int n) {
+  if (n < 0) n = (n == INT_MIN) ? INT_MAX : -n;
+  if (n < 10) return 1;
+  if (n < 100) return 2;
+  if (n < 1000) return 3;
+  if (n < 10000) return 4;
+  if (n < 100000) return 5;
+  if (n < 1000000) return 6;
+  if (n < 10000000) return 7;
+  if (n < 100000000) return 8;
+  if (n < 1000000000) return 9;
+  return 10;
+}
+
 /*** defines ***/
 
 #define KILO_VERSION    "0.0.1"
@@ -112,6 +127,7 @@ struct editorConfig {
   int screenrows;
   int screencols;
   int numrows;
+  int row_digits;
   erow *row;
   int dirty;
   char *filename;
@@ -564,9 +580,11 @@ void editorInsertRow(int at, char *s, size_t len) {
   E.row[at].render = NULL;
   E.row[at].hl = NULL;
   E.row[at].hl_open_comment = 0;
+
   editorUpdateRow(&E.row[at]);
 
   E.numrows++;
+  E.row_digits = numberOfDigits(E.numrows);
   E.dirty++;
 }
 
@@ -581,7 +599,9 @@ void editorDelRow(int at) {
   editorFreeRow(&E.row[at]);
   memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
   for (int j = at; j < E.numrows - 1; j++) E.row[j].idx--;
+
   E.numrows--;
+  E.row_digits = numberOfDigits(E.numrows);
   E.dirty++;
 }
 
@@ -984,8 +1004,12 @@ void editorDrawRows(struct abuf *ab) {
         abAppend(ab, "~", 1);
       }
     } else {
+      char num_buf[E.row_digits + 1];
+      int left = sprintf(num_buf, "%*d ", E.row_digits, filerow + 1);
+      abAppend(ab, num_buf, left);
+
       int len = E.row[filerow].rsize - E.coloff;
-      CLAMP(len, 0, E.screencols);
+      CLAMP(len, 0, E.screencols - left);
       char *c = &E.row[filerow].render[E.coloff];
       unsigned char *hl = &E.row[filerow].hl[E.coloff];
       int current_color = -1;
@@ -1073,7 +1097,7 @@ void editorRefreshScreen() {
 
   char buf[32];
   snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1,
-           (E.rx - E.coloff) + 1);
+           (E.rx - E.coloff) + E.row_digits + 2);
   abAppend(&ab, buf, strlen(buf));
 
   abAppend(&ab, "\x1b[?25h", 6); // show cursor
@@ -1099,6 +1123,7 @@ void initEditor() {
   E.rowoff = 0;
   E.coloff = 0;
   E.numrows = 0;
+  E.row_digits = 1;
   E.row = NULL;
   E.dirty = 0;
   E.filename = NULL;