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package gomplate
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"text/template"
"github.com/spf13/afero"
)
// for overriding in tests
var stdin io.ReadCloser = os.Stdin
var fs = afero.NewOsFs()
// Stdout allows overriding the writer to use when templates are written to stdout ("-").
var Stdout io.WriteCloser = os.Stdout
// tplate - models a gomplate template file...
type tplate struct {
name string
targetPath string
target io.Writer
contents string
mode os.FileMode
}
func (t *tplate) toGoTemplate(g *gomplate) (*template.Template, error) {
tmpl := template.New(t.name)
tmpl.Option("missingkey=error")
tmpl.Funcs(g.funcMap)
tmpl.Delims(g.leftDelim, g.rightDelim)
return tmpl.Parse(t.contents)
}
// loadContents - reads the template in _once_ if it hasn't yet been read. Uses the name!
func (t *tplate) loadContents() (err error) {
if t.contents == "" {
t.contents, err = readInput(t.name)
}
return err
}
func (t *tplate) addTarget() (err error) {
if t.name == "<arg>" && t.targetPath == "" {
t.targetPath = "-"
}
if t.target == nil {
t.target, err = openOutFile(t.targetPath, t.mode)
}
return err
}
// gatherTemplates - gather and prepare input template(s) and output file(s) for rendering
func gatherTemplates(o *Config) (templates []*tplate, err error) {
// the arg-provided input string gets a special name
if o.Input != "" {
templates = []*tplate{{
name: "<arg>",
contents: o.Input,
mode: os.FileMode(0644),
}}
if len(o.OutputFiles) == 1 {
templates[0].targetPath = o.OutputFiles[0]
}
}
// input dirs presume output dirs are set too
if o.InputDir != "" {
templates, err = walkDir(o.InputDir, o.OutputDir, o.ExcludeGlob)
if err != nil {
return nil, err
}
} else if len(o.InputFiles) > 0 && o.Input == "" {
templates = make([]*tplate, len(o.InputFiles))
for i := range o.InputFiles {
templates[i], err = fileToTemplates(o.InputFiles[i], o.OutputFiles[i])
if err != nil {
return nil, err
}
}
}
return processTemplates(templates)
}
func processTemplates(templates []*tplate) ([]*tplate, error) {
for _, t := range templates {
if err := t.loadContents(); err != nil {
return nil, err
}
if err := t.addTarget(); err != nil {
return nil, err
}
}
return templates, nil
}
// walkDir - given an input dir `dir` and an output dir `outDir`, and a list
// of exclude globs (if any), walk the input directory and create a list of
// tplate objects, and an error, if any.
func walkDir(dir, outDir string, excludeGlob []string) ([]*tplate, error) {
dir = filepath.Clean(dir)
outDir = filepath.Clean(outDir)
si, err := fs.Stat(dir)
if err != nil {
return nil, err
}
entries, err := afero.ReadDir(fs, dir)
if err != nil {
return nil, err
}
if err = fs.MkdirAll(outDir, si.Mode()); err != nil {
return nil, err
}
excludes, err := executeCombinedGlob(excludeGlob)
if err != nil {
return nil, err
}
templates := make([]*tplate, 0)
for _, entry := range entries {
nextInPath := filepath.Join(dir, entry.Name())
nextOutPath := filepath.Join(outDir, entry.Name())
if inList(excludes, nextInPath) {
continue
}
if entry.IsDir() {
t, err := walkDir(nextInPath, nextOutPath, excludes)
if err != nil {
return nil, err
}
templates = append(templates, t...)
} else {
templates = append(templates, &tplate{
name: nextInPath,
targetPath: nextOutPath,
mode: entry.Mode(),
})
}
}
return templates, nil
}
func fileToTemplates(inFile, outFile string) (*tplate, error) {
mode := os.FileMode(0644)
if inFile != "-" {
si, err := fs.Stat(inFile)
if err != nil {
return nil, err
}
mode = si.Mode()
}
tmpl := &tplate{
name: inFile,
targetPath: outFile,
mode: mode,
}
return tmpl, nil
}
func inList(list []string, entry string) bool {
for _, file := range list {
if file == entry {
return true
}
}
return false
}
func openOutFile(filename string, mode os.FileMode) (out io.WriteCloser, err error) {
if filename == "-" {
return Stdout, nil
}
return fs.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode.Perm())
}
func readInput(filename string) (string, error) {
var err error
var inFile io.ReadCloser
if filename == "-" {
inFile = stdin
} else {
inFile, err = fs.OpenFile(filename, os.O_RDONLY, 0)
if err != nil {
return "", fmt.Errorf("failed to open %s\n%v", filename, err)
}
// nolint: errcheck
defer inFile.Close()
}
bytes, err := ioutil.ReadAll(inFile)
if err != nil {
err = fmt.Errorf("read failed for %s\n%v", filename, err)
return "", err
}
return string(bytes), nil
}
// takes an array of glob strings and executes it as a whole,
// returning a merged list of globbed files
func executeCombinedGlob(globArray []string) ([]string, error) {
var combinedExcludes []string
for _, glob := range globArray {
excludeList, err := afero.Glob(fs, glob)
if err != nil {
return nil, err
}
combinedExcludes = append(combinedExcludes, excludeList...)
}
return combinedExcludes, nil
}
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