some template functions

README.md

@@ -259,6 +259,11 @@ expands on that a bit:
    with `?v=<32-bit hash>` appended (used to override cache settings on static
    files).
 
+ - `truncate <length> <value>` - truncate string to given length if it's
+   longer. In other case, returns original string.
+
+ - `strip_html <value>` - remove all HTML tags from string.
+
 ### Page interface
 
 - `.Site` - global [site object](#site-interface).

processors.go

@@ -4,14 +4,11 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"hash/adler32"
-	"io"
 	"os/exec"
 	"path/filepath"
 	"regexp"
 	"sort"
 	"strings"
-	"text/template"
 	"time"
 )
 
@@ -298,67 +295,3 @@ func ProcessRelativize(page *Page, args []string) {
 	})
 	page.SetContent(rv)
 }
-
-// template utilities
-
-var inventory = map[string]interface{}{}
-
-func HasChanged(name string, value interface{}) bool {
-	changed := true
-
-	if inventory[name] == value {
-		changed = false
-	} else {
-		inventory[name] = value
-	}
-
-	return changed
-}
-
-func Cut(value, begin, end string) (string, error) {
-	bre, err := regexp.Compile(begin)
-	if err != nil {
-		return "", err
-	}
-	ere, err := regexp.Compile(end)
-	if err != nil {
-		return "", err
-	}
-
-	bloc := bre.FindIndex([]byte(value))
-	eloc := ere.FindIndex([]byte(value))
-
-	if bloc == nil {
-		bloc = []int{0, 0}
-	}
-	if eloc == nil {
-		eloc = []int{len(value)}
-	}
-
-	return value[bloc[1]:eloc[0]], nil
-}
-
-func Hash(value string) string {
-	h := adler32.New()
-	io.WriteString(h, value)
-	return fmt.Sprintf("%x", h.Sum(nil))
-}
-
-func Versionize(current *Page, value string) string {
-	page := current.Site.Pages.ByPath(value)
-	if page == nil {
-		errhandle(fmt.Errorf(
-			"trying to versionize page which does not exist: %s, current: %s",
-			value, current.Path))
-	}
-	c := page.Process().Content()
-	h := Hash(c)
-	return current.UrlTo(page) + "?v=" + h
-}
-
-var funcMap = template.FuncMap{
-	"changed": HasChanged,
-	"cut":     Cut,
-	"hash":    Hash,
-	"version": Versionize,
-}

site.go

@@ -17,7 +17,7 @@ type Site struct {
 }
 
 func NewSite(config *SiteConfig) *Site {
-	template := template.New("no-idea-what-to-pass-here").Funcs(funcMap)
+	template := template.New("no-idea-what-to-pass-here").Funcs(TemplateFuncMap)
 	template, err := template.ParseFiles(config.Templates...)
 	errhandle(err)
 

template_funcs.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+	"hash/adler32"
+	"io"
+	"regexp"
+	"text/template"
+)
+
+var inventory = map[string]interface{}{}
+
+func HasChanged(name string, value interface{}) bool {
+	changed := true
+
+	if inventory[name] == value {
+		changed = false
+	} else {
+		inventory[name] = value
+	}
+
+	return changed
+}
+
+func Cut(value, begin, end string) (string, error) {
+	bre, err := regexp.Compile(begin)
+	if err != nil {
+		return "", err
+	}
+	ere, err := regexp.Compile(end)
+	if err != nil {
+		return "", err
+	}
+
+	bloc := bre.FindIndex([]byte(value))
+	eloc := ere.FindIndex([]byte(value))
+
+	if bloc == nil {
+		bloc = []int{0, 0}
+	}
+	if eloc == nil {
+		eloc = []int{len(value)}
+	}
+
+	return value[bloc[1]:eloc[0]], nil
+}
+
+func Hash(value string) string {
+	h := adler32.New()
+	io.WriteString(h, value)
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+func Versionize(current *Page, value string) string {
+	page := current.Site.Pages.ByPath(value)
+	if page == nil {
+		errhandle(fmt.Errorf(
+			"trying to versionize page which does not exist: %s, current: %s",
+			value, current.Path))
+	}
+	c := page.Process().Content()
+	h := Hash(c)
+	return current.UrlTo(page) + "?v=" + h
+}
+
+func Truncate(length int, value string) string {
+	if length > len(value) { length = len(value) }
+	return value[0:length]
+}
+
+func StripHTML(value string) string {
+	return regexp.MustCompile("<[^>]+>").ReplaceAllString(value, "")
+}
+
+var TemplateFuncMap = template.FuncMap{
+	"changed": HasChanged,
+	"cut":     Cut,
+	"hash":    Hash,
+	"version": Versionize,
+	"truncate": Truncate,
+	"strip_html": StripHTML,
+}