homemaker/template.go

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2017-06-29 13:40:34 +00:00
/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>, Lucas Bremgartner <lucas@bremis.ch>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
import (
"fmt"
"log"
"os"
"path"
"strconv"
"strings"
"text/template"
)
type context struct {
}
func (c *context) Env() map[string]string {
env := make(map[string]string)
for _, i := range os.Environ() {
sep := strings.Index(i, "=")
env[i[0:sep]] = i[sep+1:]
}
return env
}
func parseTemplate(params []string) (srcPath, dstPath string, mode os.FileMode, err error) {
length := len(params)
if length < 1 || length > 3 {
err = fmt.Errorf("invalid template statement")
return
}
if length > 2 {
var parsed uint64
parsed, err = strconv.ParseUint(params[2], 0, 64)
if err != nil {
return
}
mode = os.FileMode(parsed)
} else {
mode = 0755
}
dstPath = os.ExpandEnv(params[0])
srcPath = dstPath
if length > 1 {
srcPath = os.ExpandEnv(params[1])
}
return
}
func processTemplate(params []string, conf *config) (err error) {
srcPath, dstPath, mode, err := parseTemplate(params)
if err != nil {
return err
}
srcPathAbs := srcPath
if !path.IsAbs(srcPathAbs) {
srcPathAbs = path.Join(conf.srcDir, srcPath)
}
dstPathAbs := dstPath
if !path.IsAbs(dstPathAbs) {
dstPathAbs = path.Join(conf.dstDir, dstPath)
}
if _, err = os.Stat(srcPathAbs); os.IsNotExist(err) {
return fmt.Errorf("source path %s does not exist in filesystem", srcPathAbs)
}
if err = try(func() error { return createPath(dstPathAbs, conf.flags, mode) }); err != nil {
return err
}
if err = try(func() error { return cleanPath(dstPathAbs, conf.flags) }); err != nil {
return err
}
if conf.flags&flagVerbose != 0 {
log.Printf("process template %s to %s", srcPathAbs, dstPathAbs)
}
t, err := template.New(srcPath).ParseFiles(srcPathAbs)
if err != nil {
return err
}
f, err := os.Create(dstPathAbs)
if err != nil {
return err
}
defer func() {
err = f.Close()
}()
return try(func() error {
return t.Execute(f, &context{})
})
}