# Examine the result.
go tool covdata percent -i=$WORK/covdata
stdout 'coverage: 100.0% of statements'

# By default we want to see packages resident in the module covered,
# but not dependencies.
go tool covdata textfmt -i=$WORK/covdata -o=$WORK/covdata/out.txt
grep 'mode: set' $WORK/covdata/out.txt
grep 'mod.example/main/main.go:' $WORK/covdata/out.txt
grep 'mod.example/sub/sub.go:' $WORK/covdata/out.txt
! grep 'rsc.io' $WORK/covdata/out.txt

	dargs := []string{"-pkg=" + mainPkgPath, "-i=" + s.outdirs[0] + "," + s.outdirs[1],
		"-o", outf}
	lines := runToolOp(t, s, "textfmt", dargs)

	// No output expected.
	if len(lines) != 0 {
		dumplines(lines)
		t.Errorf("unexpected output from go tool covdata textfmt")
	}

	// Open and read the first few bits of the file.
	payload, err := os.ReadFile(outf)
	if err != nil {

package main

// This file contains functions and apis to support the "go tool
// covdata" sub-commands that relate to dumping text format summaries
// and reports: "pkglist", "func",  "debugdump", "percent", and
// "textfmt".

import (
	"flag"
	"fmt"
	"internal/coverage"
	"internal/coverage/calloc"
	"internal/coverage/cformat"
	"internal/coverage/cmerge"
	"internal/coverage/decodecounter"
	"internal/coverage/decodemeta"

}

func usage(msg string) {
	if len(msg) > 0 {
		fmt.Fprintf(os.Stderr, "error: %s\n", msg)
	}
	fmt.Fprintf(os.Stderr, "usage: go tool covdata [command]\n")
	fmt.Fprintf(os.Stderr, `
Commands are:

textfmt     convert coverage data to textual format
percent     output total percentage of statements covered
pkglist     output list of package import paths
func        output coverage profile information for each function

	cov-example/p/p.go:12:		emptyFn			0.0%
	cov-example/p/p.go:32:		Small			100.0%
	cov-example/p/p.go:47:		Medium			90.9%
	...
	$

4. Convert coverage data to legacy textual format:

	$ go tool covdata textfmt -i=profiledir -o=cov.txt
	$ head cov.txt
	mode: set
	cov-example/p/p.go:12.22,13.2 0 0
	cov-example/p/p.go:15.31,16.2 1 0
	cov-example/p/p.go:16.3,18.3 0 0
	cov-example/p/p.go:19.3,21.3 0 0
	...

// -cover" on a package that has functions but no tests.
func WriteCoverageProfile(b *Builder, runAct *Action, mf, outf string, w io.Writer) error {
	dir := filepath.Dir(mf)
	output, err := b.CovData(runAct, "textfmt", "-i", dir, "-o", outf)
	if err != nil {
		return b.Shell(runAct).reportCmd("", "", output, err)
	}
	_, werr := w.Write(output)
	return werr
}

// WriteCoverMetaFilesFile writes out a summary file ("meta-files

	}
}

const (
	// nolint: revive, stylecheck
	FmtOpenMetrics_0_0_1 = expfmt.OpenMetricsType + `; version=` + expfmt.OpenMetricsVersion_0_0_1 + `; charset=utf-8`
	// nolint: revive, stylecheck
	FmtOpenMetrics_1_0_0 = expfmt.OpenMetricsType + `; version=` + expfmt.OpenMetricsVersion_1_0_0 + `; charset=utf-8`
	FmtText              = `text/plain; version=` + expfmt.TextVersion + `; charset=utf-8`
)

				return
			}
		}

		contentType := expfmt.Negotiate(r.Header)
		w.Header().Set("Content-Type", string(contentType))

		enc := expfmt.NewEncoder(w, contentType)
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				// client may disconnect for any reasons
				// we do not have to log this.
				return
			}
		}
		if closer, ok := enc.(expfmt.Closer); ok {
			closer.Close()
		}
	})

		},
		{
			name:        "plaintext accept header",
			contentType: "text/plain; version=0.0.4; charset=utf-8",
			expected:    expfmt.NewFormat(expfmt.TypeTextPlain),
		},
		{
			name:        "empty accept header",
			contentType: "",
			expected:    expfmt.NewFormat(expfmt.TypeTextPlain),
		},
	}
	for _, tt := range cases {
		t.Run(tt.name, func(t *testing.T) {

			return
		}

		contentType := expfmt.Negotiate(r.Header)
		w.Header().Set("Content-Type", string(contentType))

		enc := expfmt.NewEncoder(w, contentType)
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				// client may disconnect for any reasons
				// we do not have to log this.
				return
			}
		}
		if closer, ok := enc.(expfmt.Closer); ok {
			closer.Close()
		}