doc: sample: add a slightly more complicated block sample

diag/write/pretty.c

@@ -4,10 +4,10 @@
 #include "../write.h"
 
 #include <assert.h>
+#include <ctype.h>
 #include <fx/core/stringstream.h>
 #include <fx/term/print.h>
 #include <fx/term/tty.h>
-#include <ctype.h>
 #include <ivy/line-source.h>
 #include <stdlib.h>
 
@@ -67,23 +67,23 @@ struct snippet_print_ctx {
 
 #define STREAM_COLOUR_ERROR_B(stream, str)                                     \
 	if (DIAG_STREAM_FLAG_SET(stream, IVY_DIAG_STREAM_F_COLOUR)) {          \
-		fx_stream_write_string(str, __STREAM_COLOUR_ERROR, NULL);       \
+		fx_stream_write_string(str, __STREAM_COLOUR_ERROR, NULL);      \
 	}
 #define STREAM_COLOUR_WARN_B(stream, str)                                      \
 	if (DIAG_STREAM_FLAG_SET(stream, IVY_DIAG_STREAM_F_COLOUR)) {          \
-		fx_stream_write_string(str, __STREAM_COLOUR_WARN, NULL);        \
+		fx_stream_write_string(str, __STREAM_COLOUR_WARN, NULL);       \
 	}
 #define STREAM_COLOUR_HINT_B(stream, str)                                      \
 	if (DIAG_STREAM_FLAG_SET(stream, IVY_DIAG_STREAM_F_COLOUR)) {          \
-		fx_stream_write_string(str, __STREAM_COLOUR_HINT, NULL);        \
+		fx_stream_write_string(str, __STREAM_COLOUR_HINT, NULL);       \
 	}
 #define STREAM_COLOUR_ACCENT_B(stream, str)                                    \
 	if (DIAG_STREAM_FLAG_SET(stream, IVY_DIAG_STREAM_F_COLOUR)) {          \
-		fx_stream_write_string(str, __STREAM_COLOUR_ACCENT, NULL);      \
+		fx_stream_write_string(str, __STREAM_COLOUR_ACCENT, NULL);     \
 	}
 #define STREAM_COLOUR_RESET_B(stream, str)                                     \
 	if (DIAG_STREAM_FLAG_SET(stream, IVY_DIAG_STREAM_F_COLOUR)) {          \
-		fx_stream_write_string(str, __STREAM_COLOUR_RESET, NULL);       \
+		fx_stream_write_string(str, __STREAM_COLOUR_RESET, NULL);      \
 	}
 
 static void print_header(
@@ -449,11 +449,15 @@ static void print_snippet(
 			update_highlighting(&printer);
 
 			diag_stream_putc(stream, c);
+			if (c == '[') {
+				diag_stream_putc(stream, c);
+			}
 
 			update_underline(&printer);
 		}
 
 		diag_stream_putc(stream, '\n');
+
 		write_underline(&printer);
 	}
 }

doc/sample/Simple.im

@@ -6,4 +6,6 @@ y = 32 * 64.
 z = 64 / 4.
 x = y + z.
 
+q = [ x = y[0] ].
+
 cout put:'Answer: {x}'