maintain realwallpaper in stockholm

krebs/3modules/realwallpaper.nix

@@ -77,7 +77,190 @@ let
 
       serviceConfig = {
         Type = "simple";
-        ExecStart = "${pkgs.realwallpaper}/realwallpaper.sh";
+        ExecStart = pkgs.writeDash "generate-wallpaper" ''
+          set -xeuf
+
+          # usage: getimg FILENAME URL
+          fetch() {
+            echo "fetch $1"
+            curl -LsS -z "$1" -o "$1" "$2"
+          }
+
+          # usage: check_type FILENAME TYPE
+          check_type() {
+            if ! file -ib "$1" | grep -q "^$2/"; then
+              echo "$1 is not of type $2" >&2
+              rm "$1"
+              return 1
+            fi
+          }
+
+          # usage: image_size FILENAME
+          image_size() {
+            identify "$1" | awk '{print$3}'
+          }
+
+          # usage: make_mask DST SRC MASK
+          make_layer() {
+            if needs_rebuild "$@"; then
+              echo "make $1 (apply mask)" >&2
+              convert "$2" "$3" -alpha off -compose copy_opacity -composite "$1"
+            fi
+          }
+
+          # usage: flatten DST HILAYER LOLAYER
+          flatten() {
+            if needs_rebuild "$@"; then
+              echo "make $1 (flatten)" >&2
+              composite "$2" "$3" "$1"
+            fi
+          }
+
+          # usage: needs_rebuild DST SRC...
+          needs_rebuild() {
+            a="$1"
+            shift
+            if ! test -e "$a"; then
+              #echo "  $a does not exist" >&2
+              result=0
+            else
+              result=1
+              for b; do
+                if test "$b" -nt "$a"; then
+                  #echo "  $b is newer than $a" >&2
+                  result=0
+                fi
+              done
+            fi
+            #case $result in
+            #  0) echo "$a needs rebuild" >&2;;
+            #esac
+            return $result
+          }
+
+          main() {
+            cd ${cfg.workingDir}
+
+            # fetch source images in parallel
+            fetch nightmap-raw.jpg \
+              ${cfg.nightmap} &
+            fetch daymap-raw.png \
+              ${cfg.daymap} &
+            fetch clouds-raw.jpg \
+              ${cfg.cloudmap} &
+            fetch marker.json \
+              ${cfg.marker} &
+            wait
+
+            check_type nightmap-raw.jpg image
+            check_type daymap-raw.png image
+            check_type clouds-raw.jpg image
+
+            in_size=2048x1024
+            xplanet_out_size=1466x1200
+            out_geometry=1366x768+100+160
+
+            nightsnow_color='#0c1a49'  # nightmap
+
+            for raw in \
+                nightmap-raw.jpg \
+                daymap-raw.png \
+                clouds-raw.jpg \
+                ;
+            do
+              normal=''${raw%-raw.*}.png
+              if needs_rebuild $normal $raw; then
+                echo "make $normal; normalize $raw" >&2
+                convert $raw -scale $in_size $normal
+              fi
+            done
+
+            # create nightmap-fullsnow
+            if needs_rebuild nightmap-fullsnow.png; then
+              convert -size $in_size xc:$nightsnow_color nightmap-fullsnow.png
+            fi
+
+            # extract daymap-snowmask from daymap-final
+            if needs_rebuild daymap-snowmask.png daymap.png; then
+              convert daymap.png -threshold 95% daymap-snowmask.png
+            fi
+
+            # extract nightmap-lightmask from nightmap
+            if needs_rebuild nightmap-lightmask.png nightmap.png; then
+              convert nightmap.png -threshold 25% nightmap-lightmask.png
+            fi
+
+            # create layers
+            make_layer nightmap-snowlayer.png nightmap-fullsnow.png daymap-snowmask.png
+            make_layer nightmap-lightlayer.png nightmap.png nightmap-lightmask.png
+
+            # apply layers
+            flatten nightmap-lightsnowlayer.png \
+              nightmap-lightlayer.png \
+              nightmap-snowlayer.png
+
+            flatten nightmap-final.png \
+              nightmap-lightsnowlayer.png \
+              nightmap.png
+
+            # create marker file from json
+            if [ -s marker.json ]; then
+              jq -r 'to_entries[] | @json "\(.value.latitude) \(.value.longitude)"' marker.json > marker_file
+            fi
+
+            # make all unmodified files as final
+            for normal in \
+                daymap.png \
+                clouds.png \
+                ;
+            do
+              final=''${normal%.png}-final.png
+              needs_rebuild $final &&
+                ln $normal $final
+            done
+
+            # rebuild every time to update shadow
+            xplanet --num_times 1 --geometry $xplanet_out_size \
+              --output xplanet-output.png --projection merc \
+              -config ${pkgs.writeText "xplanet.config" ''
+                [earth]
+                "Earth"
+                map=daymap-final.png
+                night_map=nightmap-final.png
+                cloud_map=clouds-final.png
+                cloud_threshold=10
+                shade=15
+              ''}
+
+            xplanet --num_times 1 --geometry $xplanet_out_size \
+              --output xplanet-krebs-output.png --projection merc \
+              -config ${pkgs.writeText "xplanet-krebs.config" ''
+                [earth]
+                "Earth"
+                map=daymap-final.png
+                night_map=nightmap-final.png
+                cloud_map=clouds-final.png
+                cloud_threshold=10
+                marker_file=marker_file
+                shade=15
+              ''}
+
+            # trim xplanet output
+            if needs_rebuild realwallpaper.png xplanet-output.png; then
+              convert xplanet-output.png -crop $out_geometry \
+                realwallpaper-tmp.png
+                mv realwallpaper-tmp.png realwallpaper.png
+            fi
+
+            if needs_rebuild realwallpaper-krebs.png xplanet-krebs-output.png; then
+              convert xplanet-krebs-output.png -crop $out_geometry \
+                realwallpaper-krebs-tmp.png
+                mv realwallpaper-krebs-tmp.png realwallpaper-krebs.png
+            fi
+          }
+
+          main "$@"
+        '';
         User = "realwallpaper";
       };
     };

krebs/5pkgs/simple/realwallpaper/default.nix

@@ -1,24 +0,0 @@
-{ stdenv, fetchgit, xplanet, imagemagick, curl, file }:
-
-stdenv.mkDerivation {
-  name = "realwallpaper";
-
-  src = fetchgit {
-    url = https://github.com/Lassulus/realwallpaper;
-    rev = "847faebc9b7e87e4bea078e3a2304ec00b4cdfc0";
-    sha256 = "10zihkwj9vpshlxw2jk67zbsy8g4i8b1y4jzna9fdcsgn7s12jrr";
-  };
-
-  phases = [
-    "unpackPhase"
-    "installPhase"
-  ];
-
-  buildInputs = [
-  ];
-
-  installPhase = ''
-    mkdir -p $out
-    cp realwallpaper.sh $out/realwallpaper.sh
-  '';
-}