Make it more clear which line in snippets is the current, even without colors #273
Description
Consider the output from https://godbolt.org/z/bfj789dbf:
Stack trace (most recent call first):
#0 0x000060e80ede8a4e in void recurse<0>() requires (0)<=(0)
at /app/example.cpp:19:16
17: //.addresses(addrs::object)
18: .colors(colors::always)
19: .print(cpptrace::generate_trace());
20: }
21: template <int i>
#1 0x000060e80ede89d8 in void recurse<1>() requires (((1)>(0)))&&(((1)%(2))==(1))
at /app/example.cpp:23:5
21: template <int i>
22: void recurse() requires (i > 0 && (i % 2) == 1) {
23: recurse<i-1>();
24: }
25: template <int i>
#2 (inlined) in void recurse<2>()
at /app/example.cpp:27:5
25: template <int i>
26: [[clang::always_inline]] void recurse() {
27: recurse<i-1>();
28: }
Without colors, it is hard to see which line is current in each frame. I think backward-cpp does a pretty good job here:
Not only does it make the whole line rather than just the line number colored, it also puts a > indicator which both draws the eye, and works without colors. (I wouldn't bother with the separate colors and | for inlined functions.)
Also, since you have column info, it might also be nice to put a ^ under the interesting char, at least if it isn't the first non-whitespace character on the line. It is perhaps tricky if the code has tabs and/or non-ascii codepoints, but the simple thing may be good enough and still useful.