Commits on Oct 10, 2023

1. Reliable ETA and progress percentage. …

   This has been bugging me for *years*. :)
   Count of finished edges isn't a great statistic, it isn't
   really obvious if LLVM will take 8 minues to build, or 10 minutes.
   
   But, it's actually pretty straight-forward to get some
   more useful information. We already know how much time each edge
   has taken, so we could just do the dumb thing, and assume that
   every edge in the plan takes the same amount of time.
   
   Or, we can do better. `.ninja_log` already contains
   the historical data on how long each edge took to produce it's outs,
   so we simply need to ensure that we populate edges with that info,
   and then we can greatly improve our predictions.
   The math is pretty simple i think.
   
   This is largely a port of a similar change i did to LLVM LIT:
   https://reviews.llvm.org/D99073
   
   With this, i get something quite lovely:
   ```
   llvm-project/build-Clang12$ NINJA_STATUS="[%f/%t %p %P][%w + %W] " /repositories/ninja/build-Clang-debug/ninja opt
   [288/2527  11%   4%][00:27 + 08:52] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/AppendingTypeTableBuilder.cpp.o
   ```
   
   I hope people will find this useful, and it could be merged.

   

   LebedevRI committed Oct 10, 2023
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