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pagination.go
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pagination.go
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package processors
import (
"errors"
"fmt"
gostatic "github.com/piranha/gostatic/lib"
"strconv"
"strings"
"time"
)
type PaginateProcessor struct {
collectPages bool
}
func NewPaginateProcessor() *PaginateProcessor {
if _, ok := gostatic.TemplateFuncMap["paginator"]; !ok {
gostatic.TemplateFuncMap["paginator"] = CurrentPaginator
}
return &PaginateProcessor{}
}
func NewPaginateCollectPagesProcessor() *PaginateProcessor {
return &PaginateProcessor{true}
}
func (p *PaginateProcessor) Process(page *gostatic.Page, args []string) error {
if !p.collectPages {
return ProcessPaginate(page, args)
}
return ProcessPaginateCollectPages(page, args)
}
func (p *PaginateProcessor) Description() string {
return "read config from content (separated by '----\\n')"
}
func (p *PaginateProcessor) Mode() int {
if p.collectPages {
return gostatic.Hidden
}
return gostatic.Pre
}
type Paginator struct {
Number int
PathPattern string
Page *gostatic.Page
Pages gostatic.PageSlice
}
var Paginated = map[string]gostatic.PageSlice{}
var Paginators = map[string]*Paginator{}
func CurrentPaginator(current *gostatic.Page) *Paginator {
// from processors.go
return Paginators[current.Source]
}
func NewPaginator() *Paginator {
p := &Paginator{
//Paginated: map[string]PageSlice{},
//Paginators: map[string]*Paginator{},
}
return p
}
func (pagi Paginator) Prev() *Paginator {
src := strings.Replace(pagi.PathPattern, "*", strconv.Itoa(pagi.Number-1), 1)
if prev, ok := Paginators[src]; ok {
return prev
}
return nil
}
func (pagi Paginator) Next() *Paginator {
src := strings.Replace(pagi.PathPattern, "*", strconv.Itoa(pagi.Number+1), 1)
if next, ok := Paginators[src]; ok {
return next
}
return nil
}
func ProcessPaginate(page *gostatic.Page, args []string) error {
if len(args) < 2 {
return errors.New("'paginate' rule needs two arguments")
}
length, err := strconv.Atoi(args[0])
if err != nil {
return err
}
pathPattern := args[1]
if pages, ok := Paginated[pathPattern]; ok {
Paginated[pathPattern] = append(pages, page)
} else {
Paginated[pathPattern] = gostatic.PageSlice{page}
}
site := page.Site
// page number, 1-based
n := 1 + ((len(Paginated[pathPattern]) - 1) / length)
listpath := strings.Replace(pathPattern, "*", strconv.Itoa(n), 1)
listpage := site.Pages.BySource(listpath)
//todo catch this
if listpage != nil {
return nil
}
pattern, rules := site.Rules.MatchedRules(listpath)
if rules == nil {
return fmt.Errorf("Paginators path '%s' does not match any rule",
listpath)
}
if len(rules) > 1 {
return fmt.Errorf("Path '%s' matches multiple rules, pagination is not supported for this case",
listpath)
}
rule := rules[0]
if !strings.HasPrefix(string(rule.Commands[0]), "paginate-collect-pages") {
rule.Commands = append(
gostatic.CommandList{gostatic.Command("paginate-collect-pages " + args[0])},
rule.Commands...)
}
listpage = &gostatic.Page{
PageHeader: gostatic.PageHeader{Title: strconv.Itoa(n)},
Site: site,
Pattern: pattern,
Rule: rule,
Source: listpath,
Path: listpath,
ModTime: time.Unix(int64(n), 0),
}
listpage.SetWasRead(true)
page.Site.Pages = append(page.Site.Pages, listpage)
listpage.Peek()
Paginators[listpath] = &Paginator{
Number: n,
PathPattern: pathPattern,
Page: listpage,
Pages: make(gostatic.PageSlice, 0),
}
return nil
}
func MinInt(a, b int) int {
if a > b {
return b
}
return a
}
func ProcessPaginateCollectPages(page *gostatic.Page, args []string) error {
length, err := strconv.Atoi(args[0])
if err != nil {
return err
}
pagi := Paginators[page.Source]
paginated := Paginated[pagi.PathPattern]
// NOTE: this hack for calling .Sort only once relies on the fact that
// site.Pages are sorted by .ModTime (if they don't have .Date), and
// .ModTime depends on a pagi.Number.
if pagi.Number == 1 {
paginated.Sort()
}
pagi.Pages = paginated[(pagi.Number-1)*length : MinInt(len(paginated), pagi.Number*length)]
return nil
}