68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/* example ex3f/ex3f.cpp
|
|
*
|
|
* @author Roland Conybeare, Jul 2026
|
|
*
|
|
* Colored nesting counters, routed through the arena-backed PrettySink
|
|
* (from xo-indentlog2) -- like xo-ppsink/example/ex3f but exercising the real
|
|
* pretty-print engine rather than the degenerate FlatSink.
|
|
*
|
|
* scope_config::nesting_level_enabled shows the depth "(N)" after the +/-
|
|
* banner marker; nesting_level_color colors just the depth (xterm 195).
|
|
* Run in a terminal to see color; piped, the raw \033[...m escapes show.
|
|
*/
|
|
|
|
#include <xo/indentlog2/print/PrettySink.hpp>
|
|
#include <xo/arena/ArenaConfig.hpp>
|
|
#include <xo/ppsink/color.hpp>
|
|
#include <xo/ppsink/scope.hpp>
|
|
#include <xo/ppsink/scope_macros.hpp>
|
|
#include <xo/ppsink/tag.hpp>
|
|
#include <iostream>
|
|
#include <string>
|
|
|
|
/* XO_ENTER0_ (trailing underscore) coexists with legacy xo-indentlog's
|
|
* XO_ENTER0, which PrettySink -> xo-arena pulls into this TU.
|
|
*/
|
|
|
|
using xo::pp::scope;
|
|
using xo::pp::scope_config;
|
|
using xo::pp::log_level;
|
|
using xo::pp::tag;
|
|
using xo::pp::xtag;
|
|
using xo::pp::PrettySink;
|
|
using xo::pp::PpConfig;
|
|
using xo::pp::ThreadLogState;
|
|
using xo::mm::ArenaConfig;
|
|
|
|
int
|
|
fib(int n) {
|
|
scope log(XO_ENTER0_(info), tag("n", n));
|
|
|
|
int retval = 1;
|
|
|
|
if (n >= 2)
|
|
retval = fib(n - 1) + fib(n - 2);
|
|
|
|
log.end_scope(tag("n", n), " <-", xtag("retval", retval));
|
|
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
main(int argc, char ** argv) {
|
|
scope_config::min_log_level = log_level::info;
|
|
scope_config::indent_width = 2;
|
|
scope_config::nesting_level_enabled = true; /* show "(N)" depth (default light-blue color) */
|
|
|
|
auto pp = std::make_unique<PrettySink>(PpConfig::colored(), nullptr /*out*/);
|
|
|
|
ThreadLogState::log_set_sink(std::move(pp));
|
|
fib(3);
|
|
ThreadLogState::log_set_sink(nullptr); /* restore default (clog) */
|
|
|
|
std::cout << pp->output();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* end ex3f.cpp */
|