mirror of
https://github.com/Theodor-Springmann-Stiftung/kgpz_web.git
synced 2025-10-28 16:45:32 +00:00
537 lines
12 KiB
Go
537 lines
12 KiB
Go
package templating
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import (
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"fmt"
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"html/template"
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"io"
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"io/fs"
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"reflect"
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"strings"
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"sync"
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"github.com/Theodor-Springmann-Stiftung/kgpz_web/functions"
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"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers"
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"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers/templatefunctions"
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"github.com/Theodor-Springmann-Stiftung/kgpz_web/views"
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"github.com/gofiber/fiber/v2"
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"github.com/gofiber/fiber/v2/middleware/etag"
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)
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const (
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ASSETS_URL_PREFIX = "/assets"
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CLEAR_LAYOUT = `
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<html>
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<head>
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{{ block "head" . }}{{ end }}
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</head>
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{{ block "body" . }}{{ end }}
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</html>`
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)
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type Engine struct {
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// NOTE: LayoutRegistry and TemplateRegistry have their own syncronization & cache and do not require a mutex here
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LayoutRegistry *LayoutRegistry
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TemplateRegistry *TemplateRegistry
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mu *sync.Mutex
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FuncMap template.FuncMap
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GlobalData fiber.Map
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}
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// INFO: We pass the app here to be able to access the config and other data for functions
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// which also means we must reload the engine if the app changes
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func NewEngine(layouts, templates *fs.FS) *Engine {
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e := Engine{
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mu: &sync.Mutex{},
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LayoutRegistry: NewLayoutRegistry(*layouts),
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TemplateRegistry: NewTemplateRegistry(*templates),
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FuncMap: make(template.FuncMap),
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}
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e.funcs()
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return &e
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}
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// PageIcon renders the appropriate icon HTML for a page based on its icon type
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func PageIcon(iconType string) template.HTML {
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switch iconType {
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case "first":
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return template.HTML(`<i class="ri-file-text-line text-black text-sm"></i>`)
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case "last":
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return template.HTML(`<i class="ri-file-text-line text-black text-sm" style="transform: scaleX(-1); display: inline-block;"></i>`)
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case "even":
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return template.HTML(`<i class="ri-file-text-line text-black text-sm" style="margin-left: 2px; transform: scaleX(-1); display: inline-block;"></i><i class="ri-file-text-line text-slate-400 text-sm"></i>`)
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case "odd":
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return template.HTML(`<i class="ri-file-text-line text-slate-400 text-sm" style="margin-left: 2px; transform: scaleX(-1); display: inline-block;"></i><i class="ri-file-text-line text-black text-sm" ></i>`)
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case "single":
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return template.HTML(`<i class="ri-file-text-line text-black text-sm"></i>`)
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default:
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return template.HTML(`<i class="ri-file-text-line text-black text-sm"></i>`)
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}
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}
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// GetPieceURL generates a piece view URL from piece ID
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func GetPieceURL(pieceID string) string {
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return "/beitrag/" + pieceID
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}
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// IssueContext formats an issue reference into a readable context string
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func IssueContext(issueRef interface{}) string {
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// Handle both direct IssueRef and map formats
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switch ref := issueRef.(type) {
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case map[string]interface{}:
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if year, ok := ref["year"].(int); ok {
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if nr, ok := ref["nr"].(int); ok {
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return fmt.Sprintf("%d Nr. %d", year, nr)
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}
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}
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return "Unbekannte Ausgabe"
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default:
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return "Unbekannte Ausgabe"
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}
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}
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// shouldSwap determines if two pieces should be swapped for chronological ordering
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func shouldSwap(item1, item2 interface{}) bool {
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// Use reflection to access IssueRefs field
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v1 := reflect.ValueOf(item1)
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v2 := reflect.ValueOf(item2)
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if v1.Kind() == reflect.Ptr {
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v1 = v1.Elem()
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}
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if v2.Kind() == reflect.Ptr {
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v2 = v2.Elem()
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}
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if v1.Kind() != reflect.Struct || v2.Kind() != reflect.Struct {
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return false
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}
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refs1 := v1.FieldByName("IssueRefs")
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refs2 := v2.FieldByName("IssueRefs")
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if !refs1.IsValid() || !refs2.IsValid() || refs1.Len() == 0 || refs2.Len() == 0 {
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return false
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}
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// Get first IssueRef for each piece
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ref1 := refs1.Index(0)
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ref2 := refs2.Index(0)
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// Get year
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when1 := ref1.FieldByName("When")
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when2 := ref2.FieldByName("When")
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if !when1.IsValid() || !when2.IsValid() {
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return false
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}
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year1 := when1.FieldByName("Year")
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year2 := when2.FieldByName("Year")
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if !year1.IsValid() || !year2.IsValid() {
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return false
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}
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y1 := int(year1.Int())
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y2 := int(year2.Int())
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if y1 != y2 {
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return y1 > y2 // Sort by year ascending
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}
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// If same year, sort by issue number
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nr1 := ref1.FieldByName("Nr")
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nr2 := ref2.FieldByName("Nr")
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if !nr1.IsValid() || !nr2.IsValid() {
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return false
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}
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n1 := int(nr1.Int())
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n2 := int(nr2.Int())
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if n1 != n2 {
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return n1 > n2 // Sort by issue number ascending
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}
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// If same issue, sort by order
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order1 := ref1.FieldByName("Order")
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order2 := ref2.FieldByName("Order")
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if !order1.IsValid() || !order2.IsValid() {
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return false
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}
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o1 := int(order1.Int())
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o2 := int(order2.Int())
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return o1 > o2 // Sort by order ascending
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}
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// extractItem extracts the Item field from a Resolved struct
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func extractItem(piece interface{}) interface{} {
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v := reflect.ValueOf(piece)
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if v.Kind() == reflect.Ptr {
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v = v.Elem()
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}
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if v.Kind() != reflect.Struct {
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return nil
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}
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itemField := v.FieldByName("Item")
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if !itemField.IsValid() {
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return nil
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}
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return itemField.Interface()
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}
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func (e *Engine) funcs() error {
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e.mu.Lock()
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e.mu.Unlock()
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// Dates
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e.AddFunc("MonthName", functions.MonthName)
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e.AddFunc("WeekdayName", functions.WeekdayName)
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e.AddFunc("HRDateShort", functions.HRDateShort)
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e.AddFunc("HRDateYear", functions.HRDateYear)
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// Math
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e.AddFunc("sub", func(a, b int) int { return a - b })
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e.AddFunc("add", func(a, b int) int { return a + b })
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e.AddFunc("mod", func(a, b int) int { return a % b })
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e.AddFunc("seq", func(start, end int) []int {
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if start > end {
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return []int{}
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}
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result := make([]int, end-start+1)
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for i := range result {
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result[i] = start + i
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}
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return result
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})
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// Template helpers
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e.AddFunc("dict", func(values ...interface{}) (map[string]interface{}, error) {
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if len(values)%2 != 0 {
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return nil, fmt.Errorf("dict requires an even number of arguments")
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}
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dict := make(map[string]interface{})
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for i := 0; i < len(values); i += 2 {
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key, ok := values[i].(string)
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if !ok {
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return nil, fmt.Errorf("dict keys must be strings")
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}
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dict[key] = values[i+1]
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}
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return dict, nil
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})
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e.AddFunc("merge", func(dest map[string]interface{}, src map[string]interface{}) map[string]interface{} {
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result := make(map[string]interface{})
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// Copy from dest first
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for k, v := range dest {
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result[k] = v
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}
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// Override with src values
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for k, v := range src {
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result[k] = v
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}
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return result
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})
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e.AddFunc("append", func(slice interface{}, item interface{}) interface{} {
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v := reflect.ValueOf(slice)
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if v.Kind() != reflect.Slice {
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return slice
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}
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newSlice := reflect.Append(v, reflect.ValueOf(item))
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return newSlice.Interface()
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})
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e.AddFunc("slice", func(items ...interface{}) []interface{} {
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return items
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})
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e.AddFunc("keys", func(m map[string]interface{}) []string {
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keys := make([]string, 0, len(m))
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for k := range m {
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keys = append(keys, k)
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}
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return keys
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})
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e.AddFunc("has", func(slice interface{}, item interface{}) bool {
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v := reflect.ValueOf(slice)
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if v.Kind() != reflect.Slice {
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return false
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}
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for i := 0; i < v.Len(); i++ {
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if reflect.DeepEqual(v.Index(i).Interface(), item) {
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return true
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}
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}
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return false
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})
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e.AddFunc("joinWithUnd", func(items []string) string {
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if len(items) == 0 {
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return ""
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}
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if len(items) == 1 {
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return items[0]
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}
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if len(items) == 2 {
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return items[0] + " und " + items[1]
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}
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// For 3+ items: "A, B und C"
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result := ""
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for i, item := range items {
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if i == 0 {
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result = item
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} else if i == len(items)-1 {
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result += " und " + item
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} else {
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result += ", " + item
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}
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}
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return result
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})
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e.AddFunc("split", func(s, delimiter string) []string {
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if s == "" {
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return []string{}
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}
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return strings.Split(s, delimiter)
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})
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e.AddFunc("sortStrings", func(items interface{}) []string {
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v := reflect.ValueOf(items)
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if v.Kind() != reflect.Slice {
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return []string{}
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}
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// Convert to string slice
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result := make([]string, v.Len())
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for i := 0; i < v.Len(); i++ {
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if str, ok := v.Index(i).Interface().(string); ok {
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result[i] = str
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}
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}
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// Simple bubble sort
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for i := 0; i < len(result)-1; i++ {
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for j := i + 1; j < len(result); j++ {
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if result[i] > result[j] {
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result[i], result[j] = result[j], result[i]
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}
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}
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}
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return result
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})
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e.AddFunc("unique", func(items interface{}) []string {
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v := reflect.ValueOf(items)
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if v.Kind() != reflect.Slice {
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return []string{}
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}
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seen := make(map[string]bool)
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result := []string{}
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for i := 0; i < v.Len(); i++ {
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if str, ok := v.Index(i).Interface().(string); ok {
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if !seen[str] {
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seen[str] = true
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result = append(result, str)
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}
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}
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}
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return result
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})
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// Strings
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e.AddFunc("FirstLetter", functions.FirstLetter)
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e.AddFunc("Upper", strings.ToUpper)
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e.AddFunc("Lower", strings.ToLower)
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e.AddFunc("Safe", functions.Safe)
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// Sorting
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e.AddFunc("SortPiecesByDate", func(pieces interface{}) interface{} {
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// Use reflection to handle any slice type
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v := reflect.ValueOf(pieces)
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if v.Kind() != reflect.Slice {
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return pieces
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}
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length := v.Len()
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if length == 0 {
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return pieces
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}
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// Create indices for sorting
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indices := make([]int, length)
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for i := range indices {
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indices[i] = i
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}
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// Sort indices based on piece comparison
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for i := 0; i < len(indices)-1; i++ {
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for j := i + 1; j < len(indices); j++ {
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piece1 := v.Index(indices[i]).Interface()
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piece2 := v.Index(indices[j]).Interface()
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// Extract the Item field from each resolved piece
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item1 := extractItem(piece1)
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item2 := extractItem(piece2)
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if item1 != nil && item2 != nil && shouldSwap(item1, item2) {
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indices[i], indices[j] = indices[j], indices[i]
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}
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}
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}
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// Create sorted slice with same type as input
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sortedSlice := reflect.MakeSlice(v.Type(), length, length)
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for i, idx := range indices {
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sortedSlice.Index(i).Set(v.Index(idx))
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}
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return sortedSlice.Interface()
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})
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// Embedding of file contents
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embedder := functions.NewEmbedder(views.StaticFS)
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e.AddFunc("EmbedSafe", embedder.EmbedSafe())
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e.AddFunc("Embed", embedder.Embed())
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e.AddFunc("EmbedXSLT", embedder.EmbedXSLT())
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// Page icons for ausgabe templates
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e.AddFunc("PageIcon", PageIcon)
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// Piece view helpers
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e.AddFunc("GetPieceURL", GetPieceURL)
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e.AddFunc("IssueContext", IssueContext)
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e.AddFunc("GetCategoryFlags", templatefunctions.GetCategoryFlags)
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return nil
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}
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func (e Engine) Pre(srv *fiber.App) error {
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srv.Use(ASSETS_URL_PREFIX, etag.New())
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srv.Use(ASSETS_URL_PREFIX, helpers.StaticHandler(&views.StaticFS))
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return nil
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}
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func (e *Engine) Globals(data fiber.Map) {
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e.mu.Lock()
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defer e.mu.Unlock()
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if e.GlobalData == nil {
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e.GlobalData = data
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} else {
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for k, v := range data {
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(e.GlobalData)[k] = v
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}
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}
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}
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func (e *Engine) Load() error {
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wg := sync.WaitGroup{}
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wg.Add(2)
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go func() {
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defer wg.Done()
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e.LayoutRegistry.Load()
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}()
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go func() {
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defer wg.Done()
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e.TemplateRegistry.Load()
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}()
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wg.Wait()
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return nil
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}
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func (e *Engine) Reload() error {
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wg := sync.WaitGroup{}
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wg.Add(2)
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go func() {
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defer wg.Done()
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e.LayoutRegistry.Reset()
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}()
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go func() {
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defer wg.Done()
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e.TemplateRegistry.Reset()
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}()
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wg.Wait()
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return nil
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}
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// INFO: fn is a function that returns either one value or two values, the second one being an error
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func (e *Engine) AddFunc(name string, fn interface{}) {
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e.mu.Lock()
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defer e.mu.Unlock()
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e.FuncMap[name] = fn
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}
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func (e *Engine) AddFuncs(funcs map[string]interface{}) {
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e.mu.Lock()
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defer e.mu.Unlock()
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for k, v := range funcs {
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e.FuncMap[k] = v
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}
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}
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func (e *Engine) Render(out io.Writer, path string, data interface{}, layout ...string) error {
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// TODO: check if a reload is needed if files on disk have changed
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ld := data.(fiber.Map)
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gd := e.GlobalData
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if e.GlobalData != nil {
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for k, v := range ld {
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gd[k] = v
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}
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}
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e.mu.Lock()
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defer e.mu.Unlock()
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var l *template.Template
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if len(layout) == 0 {
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lay, err := e.LayoutRegistry.Default(&e.FuncMap)
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if err != nil {
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return err
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}
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l = lay
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} else {
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if layout[0] == "clear" {
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lay, err := template.New("clear").Parse(CLEAR_LAYOUT)
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if err != nil {
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return err
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}
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l = lay
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} else {
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lay, err := e.LayoutRegistry.Layout(layout[0], &e.FuncMap)
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if err != nil {
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return err
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}
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l = lay
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}
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}
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lay, err := l.Clone()
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if err != nil {
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return err
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}
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err = e.TemplateRegistry.Add(path, lay, &e.FuncMap)
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if err != nil {
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return err
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}
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err = lay.Execute(out, gd)
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if err != nil {
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return err
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}
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return nil
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}
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