feat: orchestrion diff

[eliottness]

NAME:
   orchestrion diff - Generates a diff between a nominal and orchestrion-instrumented build using a go work directory that can be obtained running `orchestrion go build -work -a`. This is incompatible with coverage related flags.

USAGE:
   orchestrion diff [command options] [arguments...]

OPTIONS:
   --files         Only show file paths created by orchestrion instead of diff output (default: false)
   --filter value  Filter the diff to a regex matched on the package or file paths from the build.
   --package       Print package names instead of printing the diff (default: false)
   --debug         Also print synthetic and tracer weaved packages (default: false)
   --help, -h      show help

Closes #571

[kakkoyun]

LGTM 🎉

I see some windows test failures because of the escaping issues.

[kakkoyun]

Maybe in the subsequent PRs, we can consider git diff facilities. e.g. I use fancy git diff setup maybe it is possible to use whatever is set for git.

[eliottness]

This would require to make sure all the options I currently pass are supported. We can create an issue about this for future planning 👍

[kakkoyun]

I assume our experiments with Go diff packages didn't go well?

[eliottness]

I tried basically all of them and even combining them but none of them have context window diffs which is a necessity when stdlib files makes multiple thousands lines long

[codecov]

Codecov Report

Attention: Patch coverage is 28.37838% with 159 lines in your changes missing coverage. Please review.

Project coverage is 67.45%. Comparing base (f5bd095) to head (93f1e6b).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/report/report.go	23.41%	116 Missing and 5 partials ⚠️
internal/cmd/diff.go	0.00%	34 Missing ⚠️
internal/injector/parse/mappedfilename.go	81.81%	1 Missing and 1 partial ⚠️
internal/injector/parse/parser.go	50.00%	0 Missing and 1 partial ⚠️
internal/toolexec/aspect/oncompile.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
- Coverage   68.63%   67.45%   -1.19%     
==========================================
  Files         109      112       +3     
  Lines        7336     7715     +379     
==========================================
+ Hits         5035     5204     +169     
- Misses       1812     2001     +189     
- Partials      489      510      +21     

Components	Coverage Δ
Generators	80.24% <ø> (ø)
Instruments	∅ <ø> (∅)
Go Driver	76.51% <ø> (ø)
Toolexec Driver	70.83% <94.11%> (ø)
Aspects	76.91% <ø> (-0.72%)	⬇️
Injector	76.51% <76.92%> (-0.36%)	⬇️
Job Server	65.91% <ø> (ø)
Other	67.45% <28.37%> (-1.19%)	⬇️

Files with missing lines	Coverage Δ
internal/toolexec/aspect/oncompile-main.go	65.55% <100.00%> (ø)
internal/toolexec/aspect/specialcase.go	100.00% <100.00%> (ø)
main.go	27.27% <ø> (ø)
internal/injector/parse/parser.go	70.37% <50.00%> (ø)
internal/toolexec/aspect/oncompile.go	71.11% <87.50%> (-1.62%)	⬇️
internal/injector/parse/mappedfilename.go	80.30% <81.81%> (+1.96%)	⬆️
internal/cmd/diff.go	0.00% <0.00%> (ø)
internal/report/report.go	23.41% <23.41%> (ø)

... and 3 files with indirect coverage changes

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