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package gomplate
import (
"bytes"
"io"
"os"
"path"
"path/filepath"
"strings"
"text/template"
"time"
"github.com/hairyhenderson/gomplate/data"
"github.com/pkg/errors"
"github.com/spf13/afero"
)
// gomplate -
type gomplate struct {
funcMap template.FuncMap
leftDelim string
rightDelim string
nestedTemplates templateAliases
rootTemplate *template.Template
context interface{}
}
// runTemplate -
func (g *gomplate) runTemplate(t *tplate) error {
tmpl, err := t.toGoTemplate(g)
if err != nil {
return err
}
switch t.target.(type) {
case io.Closer:
if t.target != os.Stdout {
// nolint: errcheck
defer t.target.(io.Closer).Close()
}
}
err = tmpl.Execute(t.target, g.context)
return err
}
type templateAliases map[string]string
// newGomplate -
func newGomplate(d *data.Data, leftDelim, rightDelim string, nested templateAliases, context interface{}) *gomplate {
return &gomplate{
leftDelim: leftDelim,
rightDelim: rightDelim,
funcMap: Funcs(d),
nestedTemplates: nested,
context: context,
}
}
func parseTemplateArgs(templateArgs []string) (templateAliases, error) {
nested := templateAliases{}
for _, templateArg := range templateArgs {
err := parseTemplateArg(templateArg, nested)
if err != nil {
return nil, err
}
}
return nested, nil
}
func parseTemplateArg(templateArg string, ta templateAliases) error {
parts := strings.SplitN(templateArg, "=", 2)
pth := parts[0]
alias := ""
if len(parts) > 1 {
alias = parts[0]
pth = parts[1]
}
switch fi, err := fs.Stat(pth); {
case err != nil:
return err
case fi.IsDir():
files, err := afero.ReadDir(fs, pth)
if err != nil {
return err
}
prefix := pth
if alias != "" {
prefix = alias
}
for _, f := range files {
if !f.IsDir() { // one-level only
ta[path.Join(prefix, f.Name())] = path.Join(pth, f.Name())
}
}
default:
if alias != "" {
ta[alias] = pth
} else {
ta[pth] = pth
}
}
return nil
}
// RunTemplates - run all gomplate templates specified by the given configuration
func RunTemplates(o *Config) error {
Metrics = newMetrics()
defer runCleanupHooks()
// make sure config is sane
o.defaults()
ds := append(o.DataSources, o.Contexts...)
d, err := data.NewData(ds, o.DataSourceHeaders)
if err != nil {
return err
}
addCleanupHook(d.Cleanup)
nested, err := parseTemplateArgs(o.Templates)
if err != nil {
return err
}
c, err := createContext(o.Contexts, d)
if err != nil {
return err
}
g := newGomplate(d, o.LDelim, o.RDelim, nested, c)
return g.runTemplates(o)
}
func (g *gomplate) runTemplates(o *Config) error {
start := time.Now()
tmpl, err := gatherTemplates(o, chooseNamer(o, g))
Metrics.GatherDuration = time.Since(start)
if err != nil {
Metrics.Errors++
return err
}
Metrics.TemplatesGathered = len(tmpl)
start = time.Now()
defer func() { Metrics.TotalRenderDuration = time.Since(start) }()
for _, t := range tmpl {
tstart := time.Now()
err := g.runTemplate(t)
Metrics.RenderDuration[t.name] = time.Since(tstart)
if err != nil {
Metrics.Errors++
return err
}
Metrics.TemplatesProcessed++
}
return nil
}
func chooseNamer(o *Config, g *gomplate) func(string) (string, error) {
if o.OutputMap == "" {
return simpleNamer(o.OutputDir)
}
return mappingNamer(o.OutputMap, g)
}
func simpleNamer(outDir string) func(inPath string) (string, error) {
return func(inPath string) (string, error) {
outPath := filepath.Join(outDir, inPath)
return filepath.Clean(outPath), nil
}
}
func mappingNamer(outMap string, g *gomplate) func(string) (string, error) {
return func(inPath string) (string, error) {
out := &bytes.Buffer{}
t := &tplate{
name: "<OutputMap>",
contents: outMap,
target: out,
}
tpl, err := t.toGoTemplate(g)
if err != nil {
return "", err
}
ctx := &context{}
switch c := g.context.(type) {
case *context:
for k, v := range *c {
if k != "in" && k != "ctx" {
(*ctx)[k] = v
}
}
}
(*ctx)["ctx"] = g.context
(*ctx)["in"] = inPath
err = tpl.Execute(t.target, ctx)
if err != nil {
return "", errors.Wrapf(err, "failed to render outputMap with ctx %+v and inPath %s", ctx, inPath)
}
return filepath.Clean(strings.TrimSpace(out.String())), nil
}
}
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