Direct mode stats

[badumbatish]

Add statistics for direct mode.

This allows downstream users to inspect how efficient the direct mode caching is. My downstream work would also benefit from some form of direct mode statistics for our testing

See the new form of show-stats

Compile requests                      3
Compile requests executed             0
Cache hits                            0
Direct cache hits                     0
Cache misses                          0
Direct cache hits                     0
Cache hits rate                       -
Direct cache hits rate                -
Cache timeouts                        0
Cache read errors                     0
Forced recaches                       0
Cache write errors                    0
Cache errors                          0
Compilations                          0
Compilation failures                  0
Non-cacheable compilations            0
Non-cacheable calls                   0
Non-compilation calls                 3
Unsupported compiler calls            0
Average cache write               0.000 s
Average compiler                  0.000 s
Average cache read hit            0.000 s
Failed distributed compilations       0
Cache location                  Local disk: "/home/jjasmine/.cache/sccache"
Base directories                (none)
Use direct/preprocessor mode?   yes
Version (client)                0.17.0
Max cache size                       10 GiB

No AI is used for this PR

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.87%. Comparing base (01c35e6) to head (4b3a343).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler/compiler.rs	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2844      +/-   ##
==========================================
- Coverage   76.32%   72.87%   -3.45%     
==========================================
  Files          72       72              
  Lines       40180    40187       +7     
==========================================
- Hits        30669    29288    -1381     
- Misses       9511    10899    +1388     

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[sylvestre]

and please fix

error: all variants have the same prefix: `Direct`
    --> src/compiler/compiler.rs:1207:1
     |
1207 | / pub enum CacheType {
1208 | |     DirectHit,
1209 | |     DirectMiss,
1210 | |     DirectNotAttempted,
1211 | | }
     | |_^
     |

[sylvestre]

:(
i didn't mean to merge it
esp as rustfmt is failing

[sylvestre]

please reopen

[sylvestre]

or create a new PR
sorry about that

[badumbatish]

hi @sylvestre, no worries. I've reopened #2860 now