src

Go monorepo.
git clone git://code.dwrz.net/src
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s1012.go (1473B)

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