add template system to environment

boot.go

@@ -16,5 +16,10 @@ func boot_system() (*lib.Environment, error) {
   if err != nil {
     return env, err
   }
+  env.Template, err = lib.LoadTemplates(`templates`)
+  if err != nil {
+    return env, err
+  }
+
   return env, nil
 }

lib/environment.go

@@ -2,6 +2,7 @@ package lib
 
 import (
   "io/ioutil"
+  "text/template"
   "gopkg.in/yaml.v1"
 )
 
@@ -14,6 +15,8 @@ type Environment struct {
   Config *Settings
   // the database connection pool
   DB *Database
+  // the base template system
+  Template *template.Template
 }
 
 func LoadConfiguration() (*Settings, error) {

lib/template.go

@@ -0,0 +1,47 @@
+package lib
+
+import (
+  "log"
+  "io/ioutil"
+  "os"
+  "path/filepath"
+  "text/template"
+)
+
+type fileList struct {
+  len_base int
+  t *template.Template
+}
+
+// load all templates found as childs of the path
+func LoadTemplates(path string) (*template.Template, error) {
+  f := &fileList{len(path), &template.Template{}}
+
+  err := filepath.Walk(path, f.scanFile)
+  if err != nil {
+    return nil, err
+  }
+  return f.t, nil
+}
+
+func (f *fileList) scanFile(path string, info os.FileInfo, err error) error {
+  if err != nil { log.Println(`Error with file:`, path, `-`, err) }
+
+  if info.IsDir() {
+    log.Print(`Scanning '`, path, `' for templates`)
+  }
+  if !info.IsDir() && path[len(path) - 5:] == `.tmpl` {
+    name := path[f.len_base + 1 : len(path) - 5]
+    log.Println(`Adding:`, name)
+    f.t.New(name).Parse(read_file_content(path))
+  }
+  return nil
+}
+
+func read_file_content(path string) string {
+  content, err := ioutil.ReadFile(path)
+  if err != nil {
+    return ""
+  }
+  return string(content)
+}