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package templater
import (
"fmt"
"io/ioutil"
"strings"
"os"
"path"
"text/template"
"bytes"
"github.com/tazjin/kontemplate/context"
"github.com/polydawn/meep"
)
// Error that is caused by non-existent template files being specified
type TemplateNotFoundError struct {
meep.AllTraits
Name string
}
// Error that is caused during templating, e.g. required value being absent or invalid template format
type TemplatingError struct {
meep.AllTraits
}
func LoadAndPrepareTemplates(c *context.Context) ([]string, error) {
output := make([]string, 0)
for _, rs := range c.ResourceSets {
fmt.Fprintf(os.Stderr,"Loading resources for %s\n", rs.Name)
rp := path.Join(c.BaseDir, rs.Name)
files, err := ioutil.ReadDir(rp)
if err != nil {
return nil, meep.New(
&TemplateNotFoundError{Name: rs.Name},
meep.Cause(err),
)
}
for _, file := range files {
if !file.IsDir() && isResourceFile(file) {
p := path.Join(rp, file.Name())
o, err := templateFile(c, &rs, p)
if err != nil {
return nil, err
}
output = append(output, o)
}
}
}
return output, nil
}
func templateFile(c *context.Context, rs *context.ResourceSet, filename string) (string, error) {
tpl, err := template.ParseFiles(filename)
if err != nil {
return "", meep.New(
&TemplateNotFoundError{Name: filename},
meep.Cause(err),
)
}
var b bytes.Buffer
// Merge global and resourceset-specific values (don't override from global)
for k, v := range c.Global {
if _, ok := rs.Values[k]; !ok {
rs.Values[k] = v
}
}
err = tpl.Execute(&b, rs.Values)
if err != nil {
return "", meep.New(
&TemplatingError{},
meep.Cause(err),
)
}
return b.String(), nil
}
// Checks whether a file is a resource file (i.e. is YAML or JSON)
func isResourceFile(f os.FileInfo) bool {
return strings.HasSuffix(f.Name(), "yaml") ||
strings.HasSuffix(f.Name(), "yml") ||
strings.HasSuffix(f.Name(), "json")
}
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