Use wasm ephemeris locally and document Caddy serving

Caddyfile

@@ -0,0 +1,11 @@
+:80 {
+    root * /var/home/randogoth/Projects/code/sublunar.almanac
+    encode zstd gzip
+
+    @wasm {
+        path /js/*.wasm
+    }
+    header @wasm Content-Type application/wasm
+
+    file_server
+}

README.md

@@ -4,3 +4,8 @@ browser based tool to find auspicious hours for magical operations
 [http://almanac.sublunar.space/](http://almanac.sublunar.space/)
 
 check the article [here](http://sublunar.space/2018-12-sublunar-almanac.html)
+
+## Running without PHP (WASM path)
+- Build wasm assets: `podman run --rm --userns=keep-id -v $(pwd):/src:Z -w /src/lib/sweph docker.io/emscripten/emsdk make -f JSMakefile clean pmom install`
+- Serve statically with Caddy (example in `Caddyfile`): `caddy run --config Caddyfile`
+- Ensure `js/pmom.js` and `js/pmom.wasm` are served (Caddyfile sets `application/wasm` for `*.wasm`).

js/SL.Calendar.js

@@ -158,26 +158,19 @@ SL.Calendar = (function() {
       var files = document.getElementById('fileInput').files;
       // check if JSON file is loaded. If not, calculate...
       if (files.length <= 0) {
-        // checks if usecase is offline, then uses WebAssembly
-        if ( $("body").attr("use") != "online" ) {
-            var astrologer = new Worker('js/sweph.js');
-            astrologer.postMessage([days, ts, lat, lon]);
-            astrologer.onmessage = function(response) {
-                Hours.moments = response.data;
-                maker();
-            }
-        // checks if usecase is online, then uses server based calculation
-        } else {
-            var url = "https://almanac.sublunar.space/pmom.php?days="+days+"&ts="+ts+"&lat="+lat+"&lon="+lon;
-            fetch(url)
-            .then(function(response) {
-                return response.json();
-              })
-              .then(function(json) {
-                Hours.moments = json.query;
-                maker();
-              });
-        }
+        // always use the local WASM worker (no PHP backend needed)
+        var astrologer = new Worker('js/sweph.js');
+        astrologer.postMessage([days, ts, lat, lon]);
+        astrologer.onmessage = function(response) {
+            Hours.moments = response.data;
+            maker();
+        };
+        astrologer.onerror = function(err) {
+            NProgress.done();
+            $('#settings').modal('show');
+            alert("Ephemeris calculation failed. Please ensure pmom.js/pmom.wasm are available.\n\n" + err.message);
+            console.error(err);
+        };
       } else {
         // display calendar data from JSON file
         var fr = new FileReader();

lib/sweph/JSMakefile

@@ -27,10 +27,10 @@ SWEOBJ = swedate.o swehouse.o swejpl.o swemmoon.o swemplan.o swepcalc.o sweph.o\
 	swepdate.o swephlib.o swecl.o swehel.o
 
 pmom: pmom.o libswe.a
-	$(CC) $(OP) -o pmom.js pmom.o -s WASM=1 -s "BINARYEN_TRAP_MODE='clamp'" -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' -L. -lswe -lm -ldl
+	$(CC) $(OP) -o pmom.js pmom.o -s WASM=1 -s EXPORTED_RUNTIME_METHODS='["ccall","cwrap"]' -L. -lswe -lm -ldl
 
 install:
-	mv pmom.js ../../js/; mv pmom.wasm ../../js/; mv pmom.wast ../../js/
+	mv pmom.js ../../js/; mv pmom.wasm ../../js/
 
 # create an archive and a dynamic link libary fro SwissEph
 # a user of this library will inlcude swephexp.h  and link with -lswe

lib/sweph/pmom.c

@@ -133,7 +133,7 @@ int * planetary_moment(double lat, double lon, long unixtime, double *lunar, dou
     time_t        timestamp = 0;
     int32         year, month, day, hour, minute, second, iflag, iflgret;
     int           pl, ipl, rsmi, return_code, dl, lhour, nm;
-    double        hours, tjd_ts, te, lastnew;
+    double        hours, tjd_ts, te, lastnew = 0.0;
     double        x2[6], datm[2], geopos[3], moon[20], llp[20], lunarday[31], data[13], datb[10];
     char          serr[AS_MAXCH], starname[255];
 
@@ -188,7 +188,8 @@ int * planetary_moment(double lat, double lon, long unixtime, double *lunar, dou
     planets[16] = datb[2]; // armc
 
     // calculate moon phase
-    return_code = swe_pheno(te, SE_MOON, iflag, &moon, serr);
+    // swe_pheno expects a pointer to the first element
+    return_code = swe_pheno(te, SE_MOON, iflag, moon, serr);
     if (return_code == ERR) printf("%s\n", serr);
     lunar[1] = moon[0];
     lunar[2] = moon[1];
@@ -221,7 +222,7 @@ int * solar_moment(double lat, double lon, long unixtime, long *solar) {
     long          epoch = 0;
     struct tm     *tmp;
     time_t        timestamp = 0;
-    int32         year, month, day, hour, minute, second, iflag, pday = 0;
+    int32         year, month, day, hour, minute, second, iflag = 0, pday = 0;
     int           ipl, rsmi, hourlength[3];
     double        hours, tjd, td;
     double        datm[2], geopos[3], lastset, lastrise, nextset, nextrise, onextrise, onextset;