github.com/amarpal/go-tools@v0.0.0-20240422043104-40142f59f616/simple/s1012/s1012.go (about)

     1  package s1012
     2  
     3  import (
     4  	"go/ast"
     5  
     6  	"github.com/amarpal/go-tools/analysis/code"
     7  	"github.com/amarpal/go-tools/analysis/edit"
     8  	"github.com/amarpal/go-tools/analysis/facts/generated"
     9  	"github.com/amarpal/go-tools/analysis/lint"
    10  	"github.com/amarpal/go-tools/analysis/report"
    11  	"github.com/amarpal/go-tools/pattern"
    12  
    13  	"golang.org/x/tools/go/analysis"
    14  	"golang.org/x/tools/go/analysis/passes/inspect"
    15  )
    16  
    17  var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
    18  	Analyzer: &analysis.Analyzer{
    19  		Name:     "S1012",
    20  		Run:      run,
    21  		Requires: []*analysis.Analyzer{inspect.Analyzer, generated.Analyzer},
    22  	},
    23  	Doc: &lint.Documentation{
    24  		Title: `Replace \'time.Now().Sub(x)\' with \'time.Since(x)\'`,
    25  		Text: `The \'time.Since\' helper has the same effect as using \'time.Now().Sub(x)\'
    26  but is easier to read.`,
    27  		Before:  `time.Now().Sub(x)`,
    28  		After:   `time.Since(x)`,
    29  		Since:   "2017.1",
    30  		MergeIf: lint.MergeIfAny,
    31  	},
    32  })
    33  
    34  var Analyzer = SCAnalyzer.Analyzer
    35  
    36  var (
    37  	checkTimeSinceQ = pattern.MustParse(`(CallExpr (SelectorExpr (CallExpr (Symbol "time.Now") []) (Symbol "(time.Time).Sub")) [arg])`)
    38  	checkTimeSinceR = pattern.MustParse(`(CallExpr (SelectorExpr (Ident "time") (Ident "Since")) [arg])`)
    39  )
    40  
    41  func run(pass *analysis.Pass) (interface{}, error) {
    42  	fn := func(node ast.Node) {
    43  		if _, edits, ok := code.MatchAndEdit(pass, checkTimeSinceQ, checkTimeSinceR, node); ok {
    44  			report.Report(pass, node, "should use time.Since instead of time.Now().Sub",
    45  				report.FilterGenerated(),
    46  				report.Fixes(edit.Fix("replace with call to time.Since", edits...)))
    47  		}
    48  	}
    49  	code.Preorder(pass, fn, (*ast.CallExpr)(nil))
    50  	return nil, nil
    51  }