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package is
import (
"bytes"
"fmt"
"runtime"
"strings"
)
// callerinfo returns a string containing the file and line number of the test call
// that failed.
func callerinfo() (string, int, bool) {
file := ""
line := 0
ok := false
for i := 0; ; i++ {
_, file, line, ok = runtime.Caller(i)
if !ok {
return "", 0, false
}
parts := strings.Split(file, "/")
dir := parts[len(parts)-2]
file = parts[len(parts)-1]
if dir != "is" || file == "is_test.go" {
break
}
}
return file, line, ok
}
// decorate prefixes the string with the file and line of the call site
// and inserts the final newline if needed and indentation tabs for formatting.
// this function was copied from the testing framework.
func decorate(s string) string {
file, line, ok := callerinfo() // decorate + log + public function.
if ok {
// Truncate file name at last file name separator.
if index := strings.LastIndex(file, "/"); index >= 0 {
file = file[index+1:]
} else if index = strings.LastIndex(file, "\\"); index >= 0 {
file = file[index+1:]
}
} else {
file = "???"
line = 1
}
buf := new(bytes.Buffer)
// Every line is indented at least one tab.
buf.WriteByte('\t')
fmt.Fprintf(buf, "%s:%d: ", file, line)
lines := strings.Split(s, "\n")
if l := len(lines); l > 1 && lines[l-1] == "" {
lines = lines[:l-1]
}
for i, line := range lines {
if i > 0 {
// Second and subsequent lines are indented an extra tab.
buf.WriteString("\n\t\t")
}
buf.WriteString(line)
}
buf.WriteByte('\n')
return buf.String()
}
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