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// Copyright (c) 2014 TSUYUSATO Kitsune
// This software is released under the MIT License.
// http://opensource.org/licenses/mit-license.php
// Package heredoc provides the here-document with keeping indent.
//
// Golang supports raw-string syntax.
// doc := `
// Foo
// Bar
// `
// But raw-string cannot recognize indent. Thus such content is indented string, equivalent to
// "\n\tFoo\n\tBar\n"
// I dont't want this!
//
// However this problem is solved by package heredoc.
// doc := heredoc.Doc(`
// Foo
// Bar
// `)
// It is equivalent to
// "Foo\nBar\n"
package heredoc
import (
"fmt"
"strings"
"unicode"
)
// heredoc.Doc retutns unindented string as here-document.
//
// Process of making here-document:
// 1. Find most little indent size. (Skip empty lines)
// 2. Remove this indents of lines.
func Doc(raw string) string {
skipFirstLine := false
if raw[0] == '\n' {
raw = raw[1:]
} else {
skipFirstLine = true
}
minIndentSize := int(^uint(0) >> 1) // Max value of type int
lines := strings.Split(raw, "\n")
// 1.
for i, line := range lines {
if i == 0 && skipFirstLine {
continue
}
indentSize := 0
for _, r := range []rune(line) {
if unicode.IsSpace(r) {
indentSize += 1
} else {
break
}
}
if len(line) == indentSize {
if i == len(lines)-1 && indentSize < minIndentSize {
lines[i] = ""
}
} else if indentSize < minIndentSize {
minIndentSize = indentSize
}
}
// 2.
for i, line := range lines {
if i == 0 && skipFirstLine {
continue
}
if len(lines[i]) >= minIndentSize {
lines[i] = line[minIndentSize:]
}
}
return strings.Join(lines, "\n")
}
// heredoc.Docf returns unindented and formatted string as here-document.
// This format is same with package fmt's format.
func Docf(raw string, args ...interface{}) string {
return fmt.Sprintf(Doc(raw), args...)
}
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