Move template functions outside engine (refactoring)

7 files changed, 356 insertions, 167 deletions

diff --git a/template/dict.go b/template/dict.go
new file mode 100644
index 0000000..3056bcd
--- /dev/null
+++ b/template/dict.go
@@ -0,0 +1,22 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package template
+
+import "fmt"
+
+func dict(values ...interface{}) (map[string]interface{}, error) {
+	if len(values)%2 != 0 {
+		return nil, fmt.Errorf("Dict expects an even number of arguments")
+	}
+	dict := make(map[string]interface{}, len(values)/2)
+	for i := 0; i < len(values); i += 2 {
+		key, ok := values[i].(string)
+		if !ok {
+			return nil, fmt.Errorf("Dict keys must be strings")
+		}
+		dict[key] = values[i+1]
+	}
+	return dict, nil
+}
diff --git a/template/dict_test.go b/template/dict_test.go
new file mode 100644
index 0000000..8b236e0
--- /dev/null
+++ b/template/dict_test.go
@@ -0,0 +1,42 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package template
+
+import (
+	"testing"
+)
+
+func TestDict(t *testing.T) {
+	d, err := dict("k1", "v1", "k2", "v2")
+	if err != nil {
+		t.Fatalf(`The dict should be valid: %v`, err)
+	}
+
+	if value, found := d["k1"]; found {
+		if value != "v1" {
+			t.Fatalf(`Incorrect value for k1: %q`, value)
+		}
+	}
+
+	if value, found := d["k2"]; found {
+		if value != "v2" {
+			t.Fatalf(`Incorrect value for k2: %q`, value)
+		}
+	}
+}
+
+func TestDictWithIncorrectNumberOfPairs(t *testing.T) {
+	_, err := dict("k1", "v1", "k2")
+	if err == nil {
+		t.Fatalf(`The dict should not be valid because the number of keys/values pairs are incorrect`)
+	}
+}
+
+func TestDictWithInvalidKey(t *testing.T) {
+	_, err := dict(1, "v1")
+	if err == nil {
+		t.Fatalf(`The dict should not be valid because the key is not a string`)
+	}
+}
diff --git a/template/elapsed.go b/template/elapsed.go
new file mode 100644
index 0000000..273771d
--- /dev/null
+++ b/template/elapsed.go
@@ -0,0 +1,80 @@
+// Copyright (c) 2017 Hervé Gouchet. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
+package template
+
+import (
+	"math"
+	"time"
+
+	"github.com/miniflux/miniflux/locale"
+)
+
+// Texts to be translated if necessary.
+var (
+	NotYet     = `not yet`
+	JustNow    = `just now`
+	LastMinute = `1 minute ago`
+	Minutes    = `%d minutes ago`
+	LastHour   = `1 hour ago`
+	Hours      = `%d hours ago`
+	Yesterday  = `yesterday`
+	Days       = `%d days ago`
+	Weeks      = `%d weeks ago`
+	Months     = `%d months ago`
+	Years      = `%d years ago`
+)
+
+// ElapsedTime returns in a human readable format the elapsed time
+// since the given datetime.
+func elapsedTime(language *locale.Language, timezone string, t time.Time) string {
+	if t.IsZero() {
+		return language.Get(NotYet)
+	}
+
+	var now time.Time
+	loc, err := time.LoadLocation(timezone)
+	if err != nil {
+		now = time.Now()
+	} else {
+		now = time.Now().In(loc)
+
+		// The provided date is already converted to the user timezone by Postgres,
+		// but the timezone information is not set in the time struct.
+		// We cannot use time.In() because the date will be converted a second time.
+		t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), loc)
+	}
+
+	if now.Before(t) {
+		return language.Get(NotYet)
+	}
+
+	diff := now.Sub(t)
+	// Duration in seconds
+	s := diff.Seconds()
+	// Duration in days
+	d := int(s / 86400)
+	switch {
+	case s < 60:
+		return language.Get(JustNow)
+	case s < 120:
+		return language.Get(LastMinute)
+	case s < 3600:
+		return language.Get(Minutes, int(diff.Minutes()))
+	case s < 7200:
+		return language.Get(LastHour)
+	case s < 86400:
+		return language.Get(Hours, int(diff.Hours()))
+	case d == 1:
+		return language.Get(Yesterday)
+	case d < 7:
+		return language.Get(Days, d)
+	case d < 31:
+		return language.Get(Weeks, int(math.Ceil(float64(d)/7)))
+	case d < 365:
+		return language.Get(Months, int(math.Ceil(float64(d)/30)))
+	default:
+		return language.Get(Years, int(math.Ceil(float64(d)/365)))
+	}
+}
diff --git a/template/elapsed_test.go b/template/elapsed_test.go
new file mode 100644
index 0000000..b5fd4fa
--- /dev/null
+++ b/template/elapsed_test.go
@@ -0,0 +1,38 @@
+// Copyright (c) 2017 Hervé Gouchet. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
+package template
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/miniflux/miniflux/locale"
+)
+
+func TestElapsedTime(t *testing.T) {
+	var dt = []struct {
+		in  time.Time
+		out string
+	}{
+		{time.Time{}, NotYet},
+		{time.Now().Add(time.Hour), NotYet},
+		{time.Now(), JustNow},
+		{time.Now().Add(-time.Minute), LastMinute},
+		{time.Now().Add(-time.Minute * 40), fmt.Sprintf(Minutes, 40)},
+		{time.Now().Add(-time.Hour), LastHour},
+		{time.Now().Add(-time.Hour * 3), fmt.Sprintf(Hours, 3)},
+		{time.Now().Add(-time.Hour * 32), Yesterday},
+		{time.Now().Add(-time.Hour * 24 * 3), fmt.Sprintf(Days, 3)},
+		{time.Now().Add(-time.Hour * 24 * 14), fmt.Sprintf(Weeks, 2)},
+		{time.Now().Add(-time.Hour * 24 * 60), fmt.Sprintf(Months, 2)},
+		{time.Now().Add(-time.Hour * 24 * 365 * 3), fmt.Sprintf(Years, 3)},
+	}
+	for i, tt := range dt {
+		if out := elapsedTime(&locale.Language{}, "Local", tt.in); out != tt.out {
+			t.Errorf(`%d. content mismatch for "%v": expected=%q got=%q`, i, tt.in, tt.out, out)
+		}
+	}
+}
diff --git a/template/engine.go b/template/engine.go
new file mode 100644
index 0000000..7d19c8f
--- /dev/null
+++ b/template/engine.go
@@ -0,0 +1,69 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package template
+
+import (
+	"bytes"
+	"html/template"
+	"io"
+
+	"github.com/miniflux/miniflux/config"
+	"github.com/miniflux/miniflux/locale"
+	"github.com/miniflux/miniflux/logger"
+
+	"github.com/gorilla/mux"
+)
+
+// Engine handles the templating system.
+type Engine struct {
+	templates  map[string]*template.Template
+	translator *locale.Translator
+	funcMap    *funcMap
+}
+
+func (e *Engine) parseAll() {
+	commonTemplates := ""
+	for _, content := range templateCommonMap {
+		commonTemplates += content
+	}
+
+	for name, content := range templateViewsMap {
+		logger.Debug("[Template] Parsing: %s", name)
+		e.templates[name] = template.Must(template.New("main").Funcs(e.funcMap.Map()).Parse(commonTemplates + content))
+	}
+}
+
+// SetLanguage change the language for template processing.
+func (e *Engine) SetLanguage(language string) {
+	e.funcMap.Language = e.translator.GetLanguage(language)
+}
+
+// Execute process a template.
+func (e *Engine) Execute(w io.Writer, name string, data interface{}) {
+	tpl, ok := e.templates[name]
+	if !ok {
+		logger.Fatal("[Template] The template %s does not exists", name)
+	}
+
+	var b bytes.Buffer
+	err := tpl.ExecuteTemplate(&b, "base", data)
+	if err != nil {
+		logger.Fatal("[Template] Unable to render template: %v", err)
+	}
+
+	b.WriteTo(w)
+}
+
+// NewEngine returns a new template engine.
+func NewEngine(cfg *config.Config, router *mux.Router, translator *locale.Translator) *Engine {
+	tpl := &Engine{
+		templates:  make(map[string]*template.Template),
+		translator: translator,
+		funcMap:    newFuncMap(cfg, router, translator.GetLanguage("en_US")),
+	}
+
+	tpl.parseAll()
+	return tpl
+}
diff --git a/template/functions.go b/template/functions.go
new file mode 100644
index 0000000..08a4617
--- /dev/null
+++ b/template/functions.go
@@ -0,0 +1,105 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package template
+
+import (
+	"html/template"
+	"net/mail"
+	"strings"
+	"time"
+
+	"github.com/gorilla/mux"
+	"github.com/miniflux/miniflux/config"
+	"github.com/miniflux/miniflux/errors"
+	"github.com/miniflux/miniflux/filter"
+	"github.com/miniflux/miniflux/http/route"
+	"github.com/miniflux/miniflux/locale"
+	"github.com/miniflux/miniflux/url"
+)
+
+type funcMap struct {
+	cfg      *config.Config
+	router   *mux.Router
+	Language *locale.Language
+}
+
+func (f *funcMap) Map() template.FuncMap {
+	return template.FuncMap{
+		"baseURL": func() string {
+			return f.cfg.BaseURL()
+		},
+		"rootURL": func() string {
+			return f.cfg.RootURL()
+		},
+		"hasOAuth2Provider": func(provider string) bool {
+			return f.cfg.OAuth2Provider() == provider
+		},
+		"hasKey": func(dict map[string]string, key string) bool {
+			if value, found := dict[key]; found {
+				return value != ""
+			}
+			return false
+		},
+		"route": func(name string, args ...interface{}) string {
+			return route.Path(f.router, name, args...)
+		},
+		"noescape": func(str string) template.HTML {
+			return template.HTML(str)
+		},
+		"proxyFilter": func(data string) string {
+			return filter.ImageProxyFilter(f.router, data)
+		},
+		"proxyURL": func(link string) string {
+			if url.IsHTTPS(link) {
+				return link
+			}
+
+			return filter.Proxify(f.router, link)
+		},
+		"domain": func(websiteURL string) string {
+			return url.Domain(websiteURL)
+		},
+		"isEmail": func(str string) bool {
+			_, err := mail.ParseAddress(str)
+			if err != nil {
+				return false
+			}
+			return true
+		},
+		"hasPrefix": func(str, prefix string) bool {
+			return strings.HasPrefix(str, prefix)
+		},
+		"contains": func(str, substr string) bool {
+			return strings.Contains(str, substr)
+		},
+		"isodate": func(ts time.Time) string {
+			return ts.Format("2006-01-02 15:04:05")
+		},
+		"elapsed": func(timezone string, t time.Time) string {
+			return elapsedTime(f.Language, timezone, t)
+		},
+		"t": func(key interface{}, args ...interface{}) string {
+			switch key.(type) {
+			case string:
+				return f.Language.Get(key.(string), args...)
+			case errors.LocalizedError:
+				err := key.(errors.LocalizedError)
+				return err.Localize(f.Language)
+			case error:
+				return key.(error).Error()
+			default:
+				return ""
+			}
+		},
+		"plural": func(key string, n int, args ...interface{}) string {
+			return f.Language.Plural(key, n, args...)
+		},
+		"dict": dict,
+	}
+}
+
+func newFuncMap(cfg *config.Config, router *mux.Router, language *locale.Language) *funcMap {
+	return &funcMap{cfg, router, language}
+}
diff --git a/template/template.go b/template/template.go
deleted file mode 100644
index a78f931..0000000
--- a/template/template.go
+++ /dev/null
@@ -1,167 +0,0 @@
-// Copyright 2017 Frédéric Guilloe. All rights reserved.
-// Use of this source code is governed by the Apache 2.0
-// license that can be found in the LICENSE file.
-
-package template
-
-import (
-	"bytes"
-	"fmt"
-	"html/template"
-	"io"
-	"net/mail"
-	"strings"
-	"time"
-
-	"github.com/miniflux/miniflux/config"
-	"github.com/miniflux/miniflux/duration"
-	"github.com/miniflux/miniflux/errors"
-	"github.com/miniflux/miniflux/filter"
-	"github.com/miniflux/miniflux/http/route"
-	"github.com/miniflux/miniflux/locale"
-	"github.com/miniflux/miniflux/logger"
-	"github.com/miniflux/miniflux/url"
-
-	"github.com/gorilla/mux"
-)
-
-// Engine handles the templating system.
-type Engine struct {
-	templates     map[string]*template.Template
-	router        *mux.Router
-	translator    *locale.Translator
-	currentLocale *locale.Language
-	cfg           *config.Config
-}
-
-func (e *Engine) parseAll() {
-	funcMap := template.FuncMap{
-		"baseURL": func() string {
-			return e.cfg.BaseURL()
-		},
-		"rootURL": func() string {
-			return e.cfg.RootURL()
-		},
-		"hasOAuth2Provider": func(provider string) bool {
-			return e.cfg.OAuth2Provider() == provider
-		},
-		"hasKey": func(dict map[string]string, key string) bool {
-			if value, found := dict[key]; found {
-				return value != ""
-			}
-			return false
-		},
-		"route": func(name string, args ...interface{}) string {
-			return route.Path(e.router, name, args...)
-		},
-		"noescape": func(str string) template.HTML {
-			return template.HTML(str)
-		},
-		"proxyFilter": func(data string) string {
-			return filter.ImageProxyFilter(e.router, data)
-		},
-		"proxyURL": func(link string) string {
-			if url.IsHTTPS(link) {
-				return link
-			}
-
-			return filter.Proxify(e.router, link)
-		},
-		"domain": func(websiteURL string) string {
-			return url.Domain(websiteURL)
-		},
-		"isEmail": func(str string) bool {
-			_, err := mail.ParseAddress(str)
-			if err != nil {
-				return false
-			}
-			return true
-		},
-		"hasPrefix": func(str, prefix string) bool {
-			return strings.HasPrefix(str, prefix)
-		},
-		"contains": func(str, substr string) bool {
-			return strings.Contains(str, substr)
-		},
-		"isodate": func(ts time.Time) string {
-			return ts.Format("2006-01-02 15:04:05")
-		},
-		"elapsed": func(timezone string, t time.Time) string {
-			return duration.ElapsedTime(e.currentLocale, timezone, t)
-		},
-		"t": func(key interface{}, args ...interface{}) string {
-			switch key.(type) {
-			case string:
-				return e.currentLocale.Get(key.(string), args...)
-			case errors.LocalizedError:
-				err := key.(errors.LocalizedError)
-				return err.Localize(e.currentLocale)
-			case error:
-				return key.(error).Error()
-			default:
-				return ""
-			}
-		},
-		"plural": func(key string, n int, args ...interface{}) string {
-			return e.currentLocale.Plural(key, n, args...)
-		},
-		"dict": func(values ...interface{}) (map[string]interface{}, error) {
-			if len(values)%2 != 0 {
-				return nil, fmt.Errorf("Dict expects an even number of arguments")
-			}
-			dict := make(map[string]interface{}, len(values)/2)
-			for i := 0; i < len(values); i += 2 {
-				key, ok := values[i].(string)
-				if !ok {
-					return nil, fmt.Errorf("Dict keys must be strings")
-				}
-				dict[key] = values[i+1]
-			}
-			return dict, nil
-		},
-	}
-
-	commonTemplates := ""
-	for _, content := range templateCommonMap {
-		commonTemplates += content
-	}
-
-	for name, content := range templateViewsMap {
-		logger.Debug("[Template] Parsing: %s", name)
-		e.templates[name] = template.Must(template.New("main").Funcs(funcMap).Parse(commonTemplates + content))
-	}
-}
-
-// SetLanguage change the language for template processing.
-func (e *Engine) SetLanguage(language string) {
-	e.currentLocale = e.translator.GetLanguage(language)
-}
-
-// Execute process a template.
-func (e *Engine) Execute(w io.Writer, name string, data interface{}) {
-	tpl, ok := e.templates[name]
-	if !ok {
-		logger.Fatal("[Template] The template %s does not exists", name)
-	}
-
-	var b bytes.Buffer
-	err := tpl.ExecuteTemplate(&b, "base", data)
-	if err != nil {
-		logger.Fatal("[Template] Unable to render template: %v", err)
-	}
-
-	b.WriteTo(w)
-}
-
-// NewEngine returns a new template Engine.
-func NewEngine(cfg *config.Config, router *mux.Router, translator *locale.Translator) *Engine {
-	tpl := &Engine{
-		templates:  make(map[string]*template.Template),
-		router:     router,
-		translator: translator,
-		cfg:        cfg,
-	}
-
-	tpl.parseAll()
-	return tpl
-}