tlog.app/go/errors@v0.9.0/fmt.go (about)

     1  package errors
     2  
     3  import (
     4  	"fmt"
     5  )
     6  
     7  // Format formats error message and adds location if present.
     8  //
     9  // fmt.Formatter interface implementation.
    10  func (e wrapper) Format(s fmt.State, c rune) {
    11  	e.formatMain(s, c)
    12  	e.formatSub(s, c, true)
    13  }
    14  
    15  func (e wrapper) formatMain(s fmt.State, _ rune) {
    16  	if e.msg == "" {
    17  		e.msg = nomessage
    18  	}
    19  
    20  	fmt.Fprintf(s, "%s", e.msg)
    21  }
    22  
    23  func (e wrapper) formatSub(s fmt.State, c rune, delim bool) {
    24  	if e.err == nil {
    25  		return
    26  	}
    27  
    28  	if delim {
    29  		if s.Flag(' ') {
    30  			_, _ = s.Write([]byte{'\n'})
    31  		} else {
    32  			_, _ = s.Write([]byte{':', ' '})
    33  		}
    34  	}
    35  
    36  	subPrintArg(s, e.err, c)
    37  }
    38  
    39  func (e withPC) Format(s fmt.State, c rune) {
    40  	if e.msg != "" || s.Flag('+') || e.err == nil {
    41  		e.wrapper.formatMain(s, c)
    42  	}
    43  
    44  	if e.pc != 0 && s.Flag('+') {
    45  		if s.Flag(' ') {
    46  			fmt.Fprintf(s, " at %+v", e.pc)
    47  		} else {
    48  			fmt.Fprintf(s, " (%v)", e.pc)
    49  		}
    50  	}
    51  
    52  	e.wrapper.formatSub(s, c, e.msg != "" || s.Flag('+'))
    53  }