Move wisski instance code to separate package

internal/wisski/pathbuilders.go

@@ -0,0 +1,36 @@
+package wisski
+
+import (
+	_ "embed"
+
+	"golang.org/x/exp/slices"
+)
+
+//go:embed php/export_pathbuilder.php
+var exportPathbuilderPHP string
+
+// Pathbuilders returns the ids of all pathbuilders in consistent order.
+//
+// server is the server to fetch the pathbuilders from, any may be nil.
+func (wisski *WissKI) Pathbuilders(server *PHPServer) (ids []string, err error) {
+	err = wisski.ExecPHPScript(server, &ids, exportPathbuilderPHP, "all_list")
+	slices.Sort(ids)
+	return
+}
+
+// Pathbuilder returns a single pathbuilder as xml.
+// If it does not exist, it returns the empty string and nil error.
+//
+// server is the server to fetch the pathbuilders from, any may be nil.
+func (wisski *WissKI) Pathbuilder(server *PHPServer, id string) (xml string, err error) {
+	err = wisski.ExecPHPScript(server, &xml, exportPathbuilderPHP, "one_xml", id)
+	return
+}
+
+// AllPathbuilders returns all pathbuilders serialized as xml
+//
+// server is the server to fetch the pathbuilders from, any may be nil.
+func (wisski *WissKI) AllPathbuilders(server *PHPServer) (pathbuilders map[string]string, err error) {
+	err = wisski.ExecPHPScript(server, &pathbuilders, exportPathbuilderPHP, "all_xml")
+	return
+}