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started migration to go templates

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This commit is contained in:
Serge A. Zaitsev 2015-08-29 18:46:05 +02:00
parent 49a47d065d
commit 85f08718a7
3 changed files with 114 additions and 72 deletions
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2
testdata/page/index.html vendored
View File

@ -1,5 +1,5 @@
<html>
<body>
<h1>{{ echo Hello }}</h1>
<h1>{{ println "Hello" }}</h1>
</body>
</html>

155
zs.go
View File

@ -11,6 +11,7 @@ import (
"path"
"path/filepath"
"strings"
"text/template"
"time"
"github.com/eknkc/amber"
@ -25,8 +26,6 @@ const (
type Vars map[string]string
type EvalFn func(args []string, vars Vars) (string, error)
// Splits a string in exactly two parts by delimiter
// If no delimiter is found - the second string is be empty
func split2(s, delim string) (string, string) {
@ -66,37 +65,24 @@ func md(path string) (Vars, string, error) {
return v, body, nil
}
func render(s string, vars Vars, eval EvalFn) (string, error) {
delim_open := "{{"
delim_close := "}}"
out := bytes.NewBuffer(nil)
for {
if from := strings.Index(s, delim_open); from == -1 {
out.WriteString(s)
return out.String(), nil
} else {
if to := strings.Index(s, delim_close); to == -1 {
return "", fmt.Errorf("Close delim not found")
} else {
out.WriteString(s[:from])
cmd := s[from+len(delim_open) : to]
s = s[to+len(delim_close):]
m := strings.Fields(cmd)
if len(m) == 1 {
if v, ok := vars[m[0]]; ok {
out.WriteString(v)
continue
}
}
if res, err := eval(m, vars); err == nil {
out.WriteString(res)
} else {
log.Println(err) // silent
}
}
}
// Use standard Go templates
func render(s string, funcs template.FuncMap, vars Vars) (string, error) {
f := template.FuncMap{}
for k, v := range funcs {
f[k] = v
}
for k, v := range vars {
f[k] = varFunc(v)
}
tmpl, err := template.New("").Funcs(f).Parse(s)
if err != nil {
return "", err
}
out := &bytes.Buffer{}
if err := tmpl.Execute(out, vars); err != nil {
return "", err
}
return string(out.Bytes()), nil
}
// Converts zs markdown variables into environment variables
@ -132,6 +118,8 @@ func run(cmd string, args []string, vars Vars, output io.Writer) error {
return nil
}
// Expands macro: either replacing it with the variable value, or
// running the plugin command and replacing it with the command's output
func eval(cmd []string, vars Vars) (string, error) {
outbuf := bytes.NewBuffer(nil)
err := run(path.Join(ZSDIR, cmd[0]), cmd[1:], vars, outbuf)
@ -149,25 +137,31 @@ func eval(cmd []string, vars Vars) (string, error) {
return outbuf.String(), nil
}
func buildMarkdown(path string) error {
// Renders markdown with the given layout into html expanding all the macros
func buildMarkdown(path string, funcs template.FuncMap, vars Vars) error {
v, body, err := md(path)
if err != nil {
return err
}
content, err := render(body, v, eval)
content, err := render(body, funcs, v)
if err != nil {
return err
}
v["content"] = string(blackfriday.MarkdownBasic([]byte(content)))
return buildPlain(filepath.Join(ZSDIR, v["layout"]), v)
if strings.HasSuffix(v["layout"], ".amber") {
return buildAmber(filepath.Join(ZSDIR, v["layout"]), funcs, v)
} else {
return buildPlain(filepath.Join(ZSDIR, v["layout"]), funcs, v)
}
}
func buildPlain(path string, vars Vars) error {
// Renders text file expanding all variable macros inside it
func buildPlain(path string, funcs template.FuncMap, vars Vars) error {
b, err := ioutil.ReadFile(path)
if err != nil {
return err
}
content, err := render(string(b), vars, eval)
content, err := render(string(b), funcs, vars)
if err != nil {
return err
}
@ -182,26 +176,8 @@ func buildPlain(path string, vars Vars) error {
return nil
}
func buildGCSS(path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
s := strings.TrimSuffix(path, ".gcss") + ".css"
log.Println(s)
css, err := os.Create(filepath.Join(PUBDIR, s))
if err != nil {
return err
}
defer f.Close()
defer css.Close()
_, err = gcss.Compile(css, f)
return err
}
func buildAmber(path string, vars Vars) error {
// Renders .amber file into .html
func buildAmber(path string, funcs template.FuncMap, vars Vars) error {
a := amber.New()
err := a.ParseFile(path)
if err != nil {
@ -221,6 +197,26 @@ func buildAmber(path string, vars Vars) error {
return t.Execute(f, vars)
}
// Compiles .gcss into .css
func buildGCSS(path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
s := strings.TrimSuffix(path, ".gcss") + ".css"
css, err := os.Create(filepath.Join(PUBDIR, s))
if err != nil {
return err
}
defer f.Close()
defer css.Close()
_, err = gcss.Compile(css, f)
return err
}
// Copies file from working directory into public directory
func copyFile(path string) (err error) {
var in, out *os.File
if in, err = os.Open(path); err == nil {
@ -233,11 +229,48 @@ func copyFile(path string) (err error) {
return err
}
func varFunc(s string) func() string {
return func() string {
return s
}
}
func pluginFunc(cmd string) func() string {
return func() string {
return "Not implemented yet"
}
}
func createFuncs() template.FuncMap {
// Builtin functions
funcs := template.FuncMap{}
// Plugin functions
files, _ := ioutil.ReadDir(ZSDIR)
for _, f := range files {
if !f.IsDir() {
name := f.Name()
if !strings.HasSuffix(name, ".html") && !strings.HasSuffix(name, ".amber") {
funcs[strings.TrimSuffix(name, filepath.Ext(name))] = pluginFunc(name)
}
}
}
return funcs
}
func buildAll(once bool) {
lastModified := time.Unix(0, 0)
modified := false
// Convert env variables into zs global variables
globals := Vars{}
for _, e := range os.Environ() {
pair := strings.Split(e, "=")
if strings.HasPrefix(pair[0], "ZS_") {
globals[strings.ToLower(pair[0][3:])] = pair[1]
}
}
for {
os.Mkdir(PUBDIR, 0755)
funcs := createFuncs()
err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
// ignore hidden files and directories
if filepath.Base(path)[0] == '.' || strings.HasPrefix(path, ".") {
@ -250,19 +283,20 @@ func buildAll(once bool) {
} else if info.ModTime().After(lastModified) {
if !modified {
// About to be modified, so run pre-build hook
// FIXME on windows it might not work well
run(filepath.Join(ZSDIR, "pre"), []string{}, nil, nil)
modified = true
}
ext := filepath.Ext(path)
if ext == ".md" || ext == ".mkd" {
log.Println("md: ", path)
return buildMarkdown(path)
return buildMarkdown(path, funcs, globals)
} else if ext == ".html" || ext == ".xml" {
log.Println("html: ", path)
return buildPlain(path, Vars{})
return buildPlain(path, funcs, globals)
} else if ext == ".amber" {
log.Println("html: ", path)
return buildAmber(path, Vars{})
return buildAmber(path, funcs, globals)
} else if ext == ".gcss" {
log.Println("css: ", path)
return buildGCSS(path)
@ -278,6 +312,7 @@ func buildAll(once bool) {
}
if modified {
// Something was modified, so post-build hook
// FIXME on windows it might not work well
run(filepath.Join(ZSDIR, "post"), []string{}, nil, nil)
modified = false
}

29
zs_test.go
View File

@ -9,6 +9,7 @@ import (
"os/exec"
"strings"
"testing"
"text/template"
)
func TestSplit2(t *testing.T) {
@ -76,23 +77,29 @@ this: is a content`))
}
func TestRender(t *testing.T) {
eval := func(a []string, vars Vars) (string, error) {
return "hello", nil
}
vars := map[string]string{"foo": "bar"}
funcs := template.FuncMap{
"greet": func(s ...string) string {
if len(s) == 0 {
return "hello"
} else {
return "hello " + strings.Join(s, " ")
}
},
}
if s, err := render("plain text", vars, eval); err != nil || s != "plain text" {
t.Error()
if s, err := render("plain text", funcs, vars); err != nil || s != "plain text" {
t.Error(s, err)
}
if s, err := render("a {{greet}} text", vars, eval); err != nil || s != "a hello text" {
t.Error()
if s, err := render("a {{greet}} text", funcs, vars); err != nil || s != "a hello text" {
t.Error(s, err)
}
if s, err := render("{{greet}} x{{foo}}z", vars, eval); err != nil || s != "hello xbarz" {
t.Error()
if s, err := render("{{greet}} x{{foo}}z", funcs, vars); err != nil || s != "hello xbarz" {
t.Error(s, err)
}
// Test error case
if s, err := render("a {{greet text ", vars, eval); err == nil || len(s) != 0 {
t.Error()
if s, err := render("a {{greet text ", funcs, vars); err == nil || len(s) != 0 {
t.Error(s, err)
}
}