Improvements of "gf -server" mode and related setup

"gf -server" mode now contains everything needed to run the minibar and
the grammar editor (including example-based grammar writing).

The Setup.hs script installs the required files where gf -server can find them.
These files have been moved to a new directory: src/www.

The separate server program pgf-http is now obsolete.

src/www/gfse/cloud2.js

@@ -0,0 +1,159 @@
+
+function with_dir(cont) {
+    var dir=local.get("dir","");
+    if(/^\/tmp\//.test(dir)) cont(dir);
+    else ajax_http_get("/new",
+		       function(dir) {
+			   local.put("dir",dir);
+			   cont(dir);
+		       });
+}
+
+function remove_cloud_grammar(g) {
+    var dir=local.get("dir")
+    if(dir && g.unique_name) {
+	var path=g.unique_name+".json"
+	gfcloud("rm",{file:path},debug);
+    }
+}
+
+// Upload the grammar to the server and check it for errors
+function upload(g) {
+    function upload2(dir) {
+	var form=node("form",{method:"post",action:"/cloud"},
+		      [hidden("dir",dir),hidden("command","make"),
+		       hidden(g.basename+".gf",show_abstract(g))])
+	var files = [g.basename+".gf"]
+	for(var i in g.concretes) {
+	    var cname=g.basename+g.concretes[i].langcode+".gf";
+	    files.push(cname);
+	    form.appendChild(hidden(cname,
+				    show_concrete(g.basename)(g.concretes[i])));
+	}
+	editor.appendChild(form);
+	form.submit();
+	form.parentNode.removeChild(form);
+    }
+    
+    function upload3(message) {	if(message) alert(message); }
+
+    with_dir(upload2)
+}
+
+// Upload the grammar to store it in the cloud
+function upload_json(cont) {
+    function upload3(resptext,status) {
+	local.put("json_uploaded",Date.now());
+	//debug("Upload complete")
+	if(cont) cont();
+	else {
+	    var sharing=element("sharing");
+	    if(sharing) sharing.innerHTML=resptext;
+	}
+    }
+    function upload2(dir) {
+	var prefix=dir.substr(10)+"-" // skip "/tmp/gfse."
+	//debug("New form data");
+	//var form=new FormData(); // !!! Doesn't work on Android 2.2!
+	var form={dir:dir};
+	//debug("Preparing form data");
+	for(var i=0;i<local.count;i++) {
+	    var g=local.get(i,null);
+	    if(g) {
+		if(!g.unique_name) {
+		    g.unique_name=prefix+i;
+		    save_grammar(g)
+		}
+		//form.append(g.unique_name+".json",JSON.stringify(g));
+		form[encodeURIComponent(g.unique_name+".json")]=JSON.stringify(g)
+	    }
+	}
+	//debug("Upload to "+prefix);
+	ajax_http_post("/cloud","command=upload"+encodeArgs(form),upload3,cont)
+    }
+
+    with_dir(upload2);
+}
+
+function download_json() {
+    var dir=local.get("dir");
+    var index=grammar_index();
+    var downloading=0;
+
+    function get_list(ok,err) {	gfcloud("ls",{},ok,err) }
+
+    function get_file(file,ok,err) {
+	downloading++;
+	gfcloud("download",{file:encodeURIComponent(file)},ok,err);
+    }
+
+    function file_failed(errormsg,status) {
+	debug(errormsg)
+	downloading--;
+    }
+    function file_downloaded(grammar) {
+	downloading--;
+	var newg=JSON.parse(grammar);
+	debug("Downloaded "+newg.unique_name)
+	var i=index[newg.unique_name];
+	if(i!=undefined) merge_grammar(i,newg)
+	else {
+	    debug("New")
+	    newg.index=null;
+	    save_grammar(newg);
+	}
+	if(downloading==0) done()
+    }
+
+    function done() {
+	setTimeout(function(){location.href="."},2000);
+    }
+
+    function download_files(ls) {
+	local.put("current",0);
+	if(ls) {
+	    //debug("Downloading "+ls);
+	    var files=ls.split(" ");
+	    cleanup_deleted(files);
+	    for(var i in files) get_file(files[i],file_downloaded,file_failed);
+	}
+	else {
+	    debug("No grammars in the cloud")
+	    done()
+	}
+    }
+
+    get_list(download_files);
+}
+
+function link_directories(newdir,cont) {
+    gfcloud("link_directories",{newdir:newdir},cont)
+}
+
+/* -------------------------------------------------------------------------- */
+
+// Request GF cloud service
+function gfcloud(cmd,args,cont,err) {
+    with_dir(function(dir) {
+	var enc=encodeURIComponent;
+	var url="/cloud?dir="+enc(dir)+"&command="+enc(cmd)+encodeArgs(args)
+	ajax_http_get(url,cont,err)
+    })
+}
+
+// Send a command to the GF shell
+function gfshell(cmd,cont) {
+    with_dir(function(dir) {
+	var enc=encodeURIComponent;
+	ajax_http_get("/gfshell?dir="+enc(dir)+"&command="+enc(cmd),cont)
+    })
+}
+
+// Check the syntax of an expression
+function check_exp(s,cont) {
+    function check(gf_message) {
+	//debug("cc "+s+" = "+gf_message);
+	cont(/parse error/.test(gf_message) ? "parse error" : null);
+    }
+    gfshell("cc "+s,check);
+}