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mruby-bin-mirb: add line numbers to multi-line prompts

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add minimal line number decoration to prompts to help track position
within multi-line code blocks. format is 'N>' for initial line and
'N*' for continuation lines. line counter resets after each complete
evaluation for clarity and minimal visual noise.

example:
1> def foo
2*   x = 1
3* end
 => :foo
1> 1 + 1
 => 2

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-12-03 13:18:32 +09:00
parent 2f68c9ebae
commit 5a3f0e2e0b
1 changed files with 14 additions and 9 deletions
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mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
+14 -9
View File
@@ -377,14 +377,9 @@ print_hint(void)
#ifndef MRB_USE_READLINE
/* Print the command line prompt of the REPL */
static void
print_cmdline(int code_block_open)
print_cmdline(int code_block_open, int line_num)
{
if (code_block_open) {
printf("* ");
}
else {
printf("> ");
}
printf("%d%c ", line_num, code_block_open ? '*' : '>');
fflush(stdout);
}
#endif
@@ -470,6 +465,7 @@ main(int argc, char **argv)
int n;
int i;
mrb_bool code_block_open = FALSE;
int line_num = 1;
int ai;
unsigned int stack_keep = 0;
@@ -550,7 +546,7 @@ main(int argc, char **argv)
}
#ifndef MRB_USE_READLINE
print_cmdline(code_block_open);
print_cmdline(code_block_open, line_num);
signal(SIGINT, ctrl_c_handler);
char_index = 0;
@@ -567,6 +563,7 @@ main(int argc, char **argv)
ruby_code[0] = '\0';
last_code_line[0] = '\0';
code_block_open = FALSE;
line_num = 1;
puts("^C");
input_canceled = 0;
continue;
@@ -586,10 +583,15 @@ main(int argc, char **argv)
ruby_code[0] = '\0';
last_code_line[0] = '\0';
code_block_open = FALSE;
line_num = 1;
puts("^C");
}
signal(SIGINT, ctrl_c_handler);
line = MIRB_READLINE(code_block_open ? "* " : "> ");
{
char prompt[32];
snprintf(prompt, sizeof(prompt), "%d%c ", line_num, code_block_open ? '*' : '>');
line = MIRB_READLINE(prompt);
}
signal(SIGINT, SIG_DFL);
if (line == NULL) {
@@ -607,6 +609,7 @@ main(int argc, char **argv)
}
MIRB_LINE_FREE(line);
#endif
line_num++;
done:
if (code_block_open) {
@@ -654,6 +657,7 @@ main(int argc, char **argv)
char* msg = mrb_locale_from_utf8(parser->error_buffer[0].message, -1);
printf("line %d: %s\n", parser->error_buffer[0].lineno, msg);
mrb_locale_free(msg);
line_num = 1;
}
else {
/* generate bytecode */
@@ -699,6 +703,7 @@ main(int argc, char **argv)
}
ruby_code[0] = '\0';
last_code_line[0] = '\0';
line_num = 1;
mrb_gc_arena_restore(mrb, ai);
}
mrb_parser_free(parser);