golinecov

golinecov

Golinecov is a tool for analyzing the coverage profiles generated by go test -coverprofile=go.cover. It can output source code annotated with coverage per-line in plain-text format, which is an alternative to generating HTML with go tool cover -html and opening it in a web brower.

Installation

go get github.com/fhs/golinecov

Example Usage

Generate the coverage profile and call it go.cover because golinecov looks for a profile with that name by default:

$ cd $GOROOT/go/src/strings
$ go test -covermode=atomic -coverprofile=go.cover

Display source of Builder.Grow annotated with coverage per-line:

$ golinecov -src -func '^Builder\.Grow$'
10883 func (b *Builder) Grow(n int) {
10883 	b.copyCheck()
    0 	if n < 0 {
    0 		panic("strings.Builder.Grow: negative count")
    - 	}
10778 	if cap(b.buf)-len(b.buf) < n {
10778 		b.grow(n)
10778 	}
    - }

Display file strings/builder.go, annotated with coverage per-line:

$ golinecov -src strings/builder.go
...
 97.4% strings/builder.go

Display summary of coverage for all files in the profile:

$ golinecov
 97.4% strings/builder.go
100.0% strings/compare.go
 95.8% strings/reader.go
 96.8% strings/replace.go
100.0% strings/search.go
 99.0% strings/strings.go

Display summary of coverage for functions matching a regular expression:

$ golinecov -func '^Builder\.'
strings/builder.go:32:	Builder.copyCheck	100.0%
strings/builder.go:46:	Builder.String		100.0%
strings/builder.go:51:	Builder.Len		100.0%
strings/builder.go:56:	Builder.Cap		100.0%
strings/builder.go:59:	Builder.Reset		100.0%
strings/builder.go:66:	Builder.grow		100.0%
strings/builder.go:75:	Builder.Grow		80.0%
strings/builder.go:87:	Builder.Write		100.0%
strings/builder.go:95:	Builder.WriteByte	100.0%
strings/builder.go:103:	Builder.WriteRune	100.0%
strings/builder.go:120:	Builder.WriteString	100.0%
total:			(statements)		97.2%