3 files changed, 69 insertions, 5 deletions
diff --git a/krebs/5pkgs/simple/grib2json/default.nix b/krebs/5pkgs/simple/grib2json/default.nix
new file mode 100644
index 000000000..2a7959a75
--- /dev/null
+++ b/krebs/5pkgs/simple/grib2json/default.nix
@@ -0,0 +1,19 @@
+{ stdenv, fetchzip, makeWrapper, jre }:
+
+stdenv.mkDerivation {
+  name = "grib2json";
+  src = fetchzip {
+    url = "https://github.com/krebs/grib2json-bin/archive/31efe677b40fe491c988d50f96b59b1b7e2d46f7.zip";
+    sha256 = "1h3yxg270bvac7kaqsbsv4f8nln1i03rfz4cm8cp7llhjj3s6a6b";
+  };
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -r lib $out/
+    cat > $out/bin/grib2json << EOF
+    #!/bin/sh
+    set -x
+    ${jre}/bin/java -jar $out/lib/grib2json-0.8.0-SNAPSHOT.jar "\$@"
+    EOF
+    chmod +x $out/bin/grib2json
+  '';
+}
diff --git a/krebs/5pkgs/simple/nomads-cloud/default.nix b/krebs/5pkgs/simple/nomads-cloud/default.nix
new file mode 100644
index 000000000..2af74dc44
--- /dev/null
+++ b/krebs/5pkgs/simple/nomads-cloud/default.nix
@@ -0,0 +1,43 @@
+{ writers, coreutils, grib2json, curl, jq, findutils, imagemagick }:
+writers.writeDashBin "nomads-cloud" ''
+  prefix=$(mktemp -d)
+  grib_path=$prefix.grib
+  json_path=$prefix.json
+  pgm_path=$prefix.pgm
+  png_path="$1"
+
+  mkdir -p "$prefix"
+
+  date=$(${coreutils}/bin/date +%Y%m%d)
+  for hour in 18 12 06 00; do
+    url="https://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_0p25_1hr.pl?file=gfs.t''${hour}z.pgrb2.0p25.anl&lev_entire_atmosphere_%5C%28considered_as_a_single_layer%5C%29=on&var_CWAT=on&leftlon=-180&rightlon=180&toplat=90&bottomlat=-90&dir=%2Fgfs.$date%2F$hour"
+    ${curl}/bin/curl -fsS "$url" > "$grib_path"
+    if [ "$?" -eq 0 ]; then
+      break
+    fi
+  done
+  ${grib2json}/bin/grib2json --data "$grib_path" > "$json_path"
+
+  width=$(${jq}/bin/jq '.[0].header.nx' < "$json_path")
+  height=$(${jq}/bin/jq '.[0].header.ny' < "$json_path")
+
+  # The maximum gray value.  Must be bigger than 0 and less than 65536.
+  maxval=256
+
+  # pgm - Netpbm grayscale image format
+  # http://netpbm.sourceforge.net/doc/pgm.html
+  {
+    echo P2
+    echo "$width $height"
+    echo "$maxval"
+    cat "$json_path" |
+    ${jq}/bin/jq --argjson maxval "$maxval" -c '
+      .[0].data[] * $maxval | round
+    ' |
+    ${findutils}/bin/xargs -n "$width"
+  } > "$pgm_path"
+
+  ${imagemagick}/bin/convert -roll +50% "$pgm_path" "$png_path"
+
+  rm -r "$prefix"
+''
diff --git a/krebs/5pkgs/simple/realwallpaper/default.nix b/krebs/5pkgs/simple/realwallpaper/default.nix
index ef83d2e59..b46cf08c1 100644
--- a/krebs/5pkgs/simple/realwallpaper/default.nix
+++ b/krebs/5pkgs/simple/realwallpaper/default.nix
@@ -1,5 +1,5 @@
 { pkgs, ... }:
-pkgs.writeDashBin "generate-wallpaper" ''
+pkgs.writers.writeDashBin "generate-wallpaper" ''
   set -euf
 
   # usage: getimg FILENAME URL
@@ -68,15 +68,15 @@ pkgs.writeDashBin "generate-wallpaper" ''
       "$nightmap_url" &
     fetch daymap-raw.png \
       "$daymap_url" &
-    fetch clouds-raw.jpg \
-      "$cloudmap_url" &
     fetch marker.json \
       "$marker_url" &
     wait
 
+    ${pkgs.nomads-cloud}/bin/nomads-cloud clouds-raw.png
+
     check_type nightmap-raw.jpg image
     check_type daymap-raw.png image
-    check_type clouds-raw.jpg image
+    check_type clouds-raw.png image
 
     in_size=2048x1024
     xplanet_out_size=1466x1200
@@ -87,7 +87,7 @@ pkgs.writeDashBin "generate-wallpaper" ''
     for raw in \
         nightmap-raw.jpg \
         daymap-raw.png \
-        clouds-raw.jpg \
+        clouds-raw.png \
         ;
     do
       normal=''${raw%-raw.*}.png
@@ -128,6 +128,8 @@ pkgs.writeDashBin "generate-wallpaper" ''
     # create marker file from json
     if [ -s marker.json ]; then
       jq -r 'to_entries[] | @json "\(.value.latitude) \(.value.longitude)"' marker.json > marker_file
+      echo 'position=sun image=subsolar.png transparent={255,255,255}' >> marker_file
+      echo 'position=moon image=sublunar.png transparent={255,255,255}' >> marker_file
     fi
 
     # make all unmodified files as final