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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package text
import (
"fmt"
"os"
"strings"
"github.com/gohugoio/hugo/common/terminal"
)
// Positioner represents a thing that knows its position in a text file or stream,
// typically an error.
type Positioner interface {
Position() Position
}
// Position holds a source position in a text file or stream.
type Position struct {
Filename string // filename, if any
Offset int // byte offset, starting at 0. It's set to -1 if not provided.
LineNumber int // line number, starting at 1
ColumnNumber int // column number, starting at 1 (character count per line)
}
func (pos Position) String() string {
if pos.Filename == "" {
pos.Filename = "<stream>"
}
return positionStringFormatfunc(pos)
}
// IsValid returns true if line number is > 0.
func (pos Position) IsValid() bool {
return pos.LineNumber > 0
}
var positionStringFormatfunc func(p Position) string
func createPositionStringFormatter(formatStr string) func(p Position) string {
if formatStr == "" {
formatStr = "\":file::line::col\""
}
identifiers := []string{":file", ":line", ":col"}
var identifiersFound []string
for i := range formatStr {
for _, id := range identifiers {
if strings.HasPrefix(formatStr[i:], id) {
identifiersFound = append(identifiersFound, id)
}
}
}
replacer := strings.NewReplacer(":file", "%s", ":line", "%d", ":col", "%d")
format := replacer.Replace(formatStr)
f := func(pos Position) string {
args := make([]interface{}, len(identifiersFound))
for i, id := range identifiersFound {
switch id {
case ":file":
args[i] = pos.Filename
case ":line":
args[i] = pos.LineNumber
case ":col":
args[i] = pos.ColumnNumber
}
}
msg := fmt.Sprintf(format, args...)
if terminal.IsTerminal(os.Stdout) {
return terminal.Notice(msg)
}
return msg
}
return f
}
func init() {
positionStringFormatfunc = createPositionStringFormatter(os.Getenv("HUGO_FILE_LOG_FORMAT"))
}
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