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output.go
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output.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
"unicode"
"github.com/fatih/color"
"github.com/m-mizutani/goast"
"github.com/m-mizutani/goerr"
)
func outputFailAsText(w io.Writer, fail *goast.Fail) error {
code, err := getLine(fail.Path, fail.Line)
if err != nil {
return err
}
type fprintf func(w io.Writer, format string, a ...any) (n int, err error)
underLine := make([]rune, len(code))
for i, c := range code {
if i+1 < fail.Column {
switch {
case unicode.IsSpace(c):
underLine[i] = c
case i+1 < fail.Column:
underLine[i] = ' '
}
} else {
underLine[i] = '~'
}
}
var cFprintf fprintf = fmt.Fprintf
if w == os.Stdout {
cFprintf = color.New(color.FgRed).Fprintf
}
fmt.Fprintf(w, "[%s:%d] - ", fail.Path, fail.Line)
cFprintf(w, "%s\n", fail.Msg)
fmt.Fprintf(w, "\n%s\n%s\n\n", code, string(underLine))
return nil
}
func getLine(path string, line int) (string, error) {
fd, err := os.Open(path)
if err != nil {
return "", goerr.Wrap(err)
}
defer func() {
if err := fd.Close(); err != nil {
logger.Warn(err.Error())
}
}()
var idx int
scanner := bufio.NewScanner(fd)
for scanner.Scan() {
idx++
if idx == line {
return scanner.Text(), nil
}
}
return "", nil
}