[feat] add new lib: file

[hyorigo]

No description provided.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.76% (target: -1.00%)	✅ 95.43%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (5852e54)	2781	2461	88.49%
Head commit (f8e6e48)	3108 (+327)	2774 (+313)	89.25% (+0.76%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#54)	328	313	95.43%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 94.08100% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 86.02%. Comparing base (5852e54) to head (f8e6e48).

Files	Patch %	Lines
lib/file/line.go	86.36%	11 Missing and 4 partials ⚠️
internal/testloader.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   85.03%   86.02%   +0.98%     
==========================================
  Files          25       28       +3     
  Lines        2707     3027     +320     
==========================================
+ Hits         2302     2604     +302     
- Misses        313      327      +14     
- Partials       92       96       +4     

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