tpl: Add docshelper for template funcs

And fix some other minor related issues.

Updates #3418

tpl/collections/init.go

@@ -24,48 +24,122 @@ func init() {
 	f := func(d *deps.Deps) *internal.TemplateFuncsNamespace {
 		ctx := New(d)
 
-		examples := [][2]string{
-			{`{{ delimit (slice "A" "B" "C") ", " " and " }}`, `A, B and C`},
-			{`{{ echoParam .Params "langCode" }}`, `en`},
-			{`{{ if in "this string contains a substring" "substring" }}Substring found!{{ end }}`, `Substring found!`},
-			{
-				`{{ (querify "foo" 1 "bar" 2 "baz" "with spaces" "qux" "this&that=those") | safeHTML }}`,
-				`bar=2&baz=with+spaces&foo=1&qux=this%26that%3Dthose`},
-			{
-				`<a href="https://www.google.com?{{ (querify "q" "test" "page" 3) | safeURL }}">Search</a>`,
-				`<a href="https://www.google.com?page=3&amp;q=test">Search</a>`},
-			{`{{ slice "B" "C" "A" | sort }}`, `[A B C]`},
-			{`{{ seq 3 }}`, `[1 2 3]`},
-			{`{{ union (slice 1 2 3) (slice 3 4 5) }}`, `[1 2 3 4 5]`},
-		}
-
-		return &internal.TemplateFuncsNamespace{
+		ns := &internal.TemplateFuncsNamespace{
 			Name:    name,
 			Context: func() interface{} { return ctx },
-			Aliases: map[string]interface{}{
-				"after":     ctx.After,
-				"apply":     ctx.Apply,
-				"delimit":   ctx.Delimit,
-				"dict":      ctx.Dictionary,
-				"echoParam": ctx.EchoParam,
-				"first":     ctx.First,
-				"in":        ctx.In,
-				"index":     ctx.Index,
-				"intersect": ctx.Intersect,
-				"isSet":     ctx.IsSet,
-				"isset":     ctx.IsSet,
-				"last":      ctx.Last,
-				"querify":   ctx.Querify,
-				"shuffle":   ctx.Shuffle,
-				"slice":     ctx.Slice,
-				"sort":      ctx.Sort,
-				"union":     ctx.Union,
-				"where":     ctx.Where,
-				"seq":       ctx.Seq,
-			},
-			Examples: examples,
 		}
 
+		ns.AddMethodMapping(ctx.After,
+			[]string{"after"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Apply,
+			[]string{"apply"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Delimit,
+			[]string{"delimit"},
+			[][2]string{
+				{`{{ delimit (slice "A" "B" "C") ", " " and " }}`, `A, B and C`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.Dictionary,
+			[]string{"dict"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.EchoParam,
+			[]string{"echoParam"},
+			[][2]string{
+				{`{{ echoParam .Params "langCode" }}`, `en`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.First,
+			[]string{"first"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.In,
+			[]string{"in"},
+			[][2]string{
+				{`{{ if in "this string contains a substring" "substring" }}Substring found!{{ end }}`, `Substring found!`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.Index,
+			[]string{"index"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Intersect,
+			[]string{"intersect"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.IsSet,
+			[]string{"isSet", "isset"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Last,
+			[]string{"last"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Querify,
+			[]string{"querify"},
+			[][2]string{
+				{
+					`{{ (querify "foo" 1 "bar" 2 "baz" "with spaces" "qux" "this&that=those") | safeHTML }}`,
+					`bar=2&baz=with+spaces&foo=1&qux=this%26that%3Dthose`},
+				{
+					`<a href="https://www.google.com?{{ (querify "q" "test" "page" 3) | safeURL }}">Search</a>`,
+					`<a href="https://www.google.com?page=3&amp;q=test">Search</a>`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.Shuffle,
+			[]string{"shuffle"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Slice,
+			[]string{"slice"},
+			[][2]string{
+				{`{{ slice "B" "C" "A" | sort }}`, `[A B C]`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.Sort,
+			[]string{"sort"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Union,
+			[]string{"union"},
+			[][2]string{
+				{`{{ union (slice 1 2 3) (slice 3 4 5) }}`, `[1 2 3 4 5]`},
+			},
+		)
+
+		ns.AddMethodMapping(ctx.Where,
+			[]string{"where"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Seq,
+			[]string{"seq"},
+			[][2]string{
+				{`{{ seq 3 }}`, `[1 2 3]`},
+			},
+		)
+
+		return ns
+
 	}
 
 	internal.AddTemplateFuncsNamespace(f)