Add filtered rendering

Instead of rendering out everything in an svg-file,
the render script now takes in a regular expression that is uses to
search all the object-IDs inside each of the svg-files for a match
and only renders those. To make the search go faster all object-IDs
are stored in files named ".<svg-file-name>.cache" after every full
render of an svg-file or if none exist.

.gitignore

@@ -10,3 +10,4 @@ install-sh
 missing
 *.tmp
 *_timestamp
+*.cache

src/render_icons.sh

@@ -35,6 +35,29 @@ cp -ru animations $THEMEDIR/.
 cp -ru panel $THEMEDIR/.
 
 
+# Takes in an svg-file and an object-id and formats it
+# to an inkscape export shell command that inkscape can
+# then execute.
+formatInkscapeCmd() {
+
+    local CONTEXT=$1
+    local OBJECT_ID=$2
+    local SIZE=$(sed -r 's/.*\_([0-9]+).*$/\1/' <<< $OBJECT_ID)
+
+    local ICON_NAME=$(sed "s/\_$SIZE.*$//" <<< $OBJECT_ID)
+
+        echo \
+            "--export-id=$OBJECT_ID" \
+            "--export-id-only" \
+            "--export-png=$THEMEDIR/$CONTEXT/$SIZE/$ICON_NAME.png $CONTEXT.svg"
+    
+        echo \
+            "--export-id=$OBJECT_ID" \
+            "--export-dpi=180" \
+            "--export-id-only" \
+            "--export-png=$THEMEDIR/$CONTEXT/$SIZE@2x/$ICON_NAME.png $CONTEXT.svg"
+}
+
 # Generates inkscape export commands for the given
 # svg-file that can be piped to inkscape.
 genInkscapeCmds() {
@@ -43,37 +66,56 @@ genInkscapeCmds() {
 
     for SIZE in ${SIZES[@]}
     do
-        echo "Rendering icons $CONTEXT.svg @$SIZE" >&2
         for OBJECT_ID in `cat <($INKSCAPE -S $CONTEXT.svg | grep -E "_$SIZE" | sed 's/\,.*$//')`
         do
-            local ICON_NAME=$(sed "s/\_$SIZE.*$//" <<< $OBJECT_ID)
-
-            echo \
-                "--export-id=$OBJECT_ID" \
-                "--export-id-only" \
-                "--export-png=$THEMEDIR/$CONTEXT/$SIZE/$ICON_NAME.png $CONTEXT.svg"
-    
-            echo \
-                "--export-id=$OBJECT_ID" \
-                "--export-dpi=180" \
-                "--export-id-only" \
-                "--export-png=$THEMEDIR/$CONTEXT/$SIZE@2x/$ICON_NAME.png $CONTEXT.svg"
+            echo $OBJECT_ID >> .$CONTEXT.cache.tmp
+            formatInkscapeCmd $CONTEXT $OBJECT_ID
         done
     done
+    mv .$CONTEXT.cache.tmp .$CONTEXT.cache
 }
 
-for CONTEXT in ${TYPES[@]}
-do
-    # Only render out the icons if the svg-file has been modified
-    # since we finished rendering it out last.
-    if [[ $CONTEXT.svg -nt .${CONTEXT}_timestamp ]]
-    then
-        echo "Rendering icons from $CONTEXT.svg"
-        genInkscapeCmds $CONTEXT | java SplitJob $INKSCAPE --shell && touch .${CONTEXT}_timestamp
-    else
-        echo "No changes to $CONTEXT.svg, skipping..."
-    fi
-done
+# Generates inkscape export commands that matches
+# the provided regex pattern.
+genInkscapeCmdsFiltered() {
+    
+    local CONTEXT=$1
+    local REGEX=$2
+    
+    while read -r OBJECT_ID
+    do
+        echo "Match: $OBJECT_ID" >&2
+        formatInkscapeCmd $CONTEXT $OBJECT_ID
+    done < <(grep -E $REGEX .$CONTEXT.cache)
+}
 
+if [[ ! -z $1 ]]
+then
+    echo "Rendering objects with IDs matching regex"
+    for CONTEXT in ${TYPES[@]}
+    do
+        if [[ -f .$CONTEXT.cache ]] || { [[ ! -f .$CONTEXT.cache ]] && ($INKSCAPE -S $CONTEXT.svg | grep -E "_[0-9]+" | sed 's/\,.*$//' > .$CONTEXT.cache.tmp); }
+        then
+            mv .$CONTEXT.cache.tmp .$CONTEXT.cache 2> /dev/null
+            genInkscapeCmdsFiltered $CONTEXT $1 | java SplitJob $INKSCAPE --shell
+        else
+            echo "Failed creating creating object-ID cache for $CONTEXT.svg"
+        fi
+    done
+else
+    for CONTEXT in ${TYPES[@]}
+    do
+        # Only render out the icons if the svg-file has been modified
+        # since we finished rendering it out last.
+        if [[ $CONTEXT.svg -nt .${CONTEXT}_timestamp ]]
+        then
+            echo "Rendering icons from $CONTEXT.svg"
+            genInkscapeCmds $CONTEXT | java SplitJob $INKSCAPE --shell && touch .${CONTEXT}_timestamp
+        else
+            echo "No changes to $CONTEXT.svg, skipping..."
+        fi
+    done
+fi
+    
 # Remove all empty directories from the theme folder.
 find $THEMEDIR -type d -empty -delete