kilo

commit 8c1bb48b9d7939d8e4552928ac958b3749512b47
parent c5abe8f4ebfc671d324e3e38dcf2f9352fda9ef8
Author: Dimitrije Dobrota <mail@dimitrijedobrota.com>
Date:   Tue, 11 Apr 2023 00:36:06 +0200

Highlight the number on the current line

Diffstat:
M
kilo.c
 | 
35
+++++++++++++++++++++++++----------

1 file changed, 25 insertions(+), 10 deletions(-)
diff --git a/kilo.c b/kilo.c
@@ -86,6 +86,9 @@ enum editorHighlight {
   HL_CBRACKETS,
   HL_SEMICOLON,
   HL_COMMA,
+
+  HL_LINEN_CRNT,
+  HL_LINEN,
 };
 
 #define HL_HIGHLIGHT_NUMBERS   (1 << 0)
@@ -488,6 +491,10 @@ int editorSyntaxToColor(int hl) {
   case HL_CBRACKETS: return 93;
   case HL_SEMICOLON: return 93;
   case HL_COMMA: return 91;
+
+  case HL_LINEN_CRNT: return 91;
+  case HL_LINEN: return 37;
+
   default: return 37;
   }
 }
@@ -1005,6 +1012,9 @@ void editorScroll() {
 }
 
 void editorDrawRows(struct abuf *ab) {
+  char num_buf[E.row_digits + 1];
+  char color_buf[16];
+
   for (int y = 0; y < E.screenrows; y++) {
     int filerow = y + E.rowoff;
     if (filerow >= E.numrows) {
@@ -1024,12 +1034,17 @@ 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 padding = sprintf(num_buf, "%*d ", E.row_digits, filerow + 1);
+      int clen =
+          snprintf(color_buf, sizeof(color_buf), "\x1b[%dm",
+                   editorSyntaxToColor(E.cy == y ? HL_LINEN_CRNT : HL_LINEN));
+
+      abAppend(ab, color_buf, clen);
+      abAppend(ab, num_buf, padding);
+      abAppend(ab, "\x1b[39m", 5);
 
       int len = E.row[filerow].rsize - E.coloff;
-      CLAMP(len, 0, E.screencols - left);
+      CLAMP(len, 0, E.screencols - padding);
       char *c = &E.row[filerow].render[E.coloff];
       unsigned char *hl = &E.row[filerow].hl[E.coloff];
       int current_color = -1;
@@ -1043,9 +1058,9 @@ void editorDrawRows(struct abuf *ab) {
           // restore current color as <esc>[m turns off all text formatting,
           // including colors
           if (current_color != -1) {
-            char buf[16];
-            int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", current_color);
-            abAppend(ab, buf, clen);
+            int clen = snprintf(color_buf, sizeof(color_buf), "\x1b[%dm",
+                                current_color);
+            abAppend(ab, color_buf, clen);
           }
         } else if (hl[j] == HL_NORMAL) {
           if (current_color != -1) {
@@ -1057,9 +1072,9 @@ void editorDrawRows(struct abuf *ab) {
           int color = editorSyntaxToColor(hl[j]);
           if (color != current_color) {
             current_color = color;
-            char buf[16];
-            int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", color);
-            abAppend(ab, buf, clen);
+            int clen =
+                snprintf(color_buf, sizeof(color_buf), "\x1b[%dm", color);
+            abAppend(ab, color_buf, clen);
           }
           abAppend(ab, &c[j], 1);
         }