Show only installable apps

Apps with an empty variants string are considered too experimental to be installable

src/freedombone-addremove

     exit 2
 fi
 
-detect_apps
+detect_installable_apps
 
 # if no applications were found
 if [[ ${#APPS_AVAILABLE[@]} == 0 ]]; then

src/freedombone-utils-selector

 # A list of the names of installed apps
 APPS_INSTALLED_NAMES=()
 
+function app_variants {
+    filename=$1
+    variants_line=$(cat ${filename} | grep "VARIANTS=")
+    if [[ "$variants_line" == *"'"* ]]; then
+        variants_list=$(echo "$variants_line" | awk -F '=' '{print $2}' | awk -F "'" '{print $2}')
+    else
+        variants_list=$(echo "$variants_line" | awk -F '=' '{print $2}' | awk -F '"' '{print $2}')
+    fi
+    echo "$variants_list"
+}
+
 function item_in_array {
     local e
     for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
     get_apps_installed_names
 }
 
+function detect_installable_apps {
+    FILES=/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*
+
+    APPS_AVAILABLE=()
+    APPS_CHOSEN=()
+    APPS_INSTALLED=()
+    APPS_INSTALLED_NAMES=()
+
+    function_check app_is_installed
+
+    # for all the app scripts
+    for filename in $FILES
+    do
+        app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')
+        if [[ $(item_in_array ${app_name} ${APPS_AVAILABLE[@]}) != 0 ]]; then
+            variants_list=$(app_variants $filename)
+            if [ ${#variants_list} -gt 0 ]; then
+                APPS_AVAILABLE+=("${app_name}")
+                APPS_CHOSEN+=("0")
+                APPS_INSTALLED+=("$(app_is_installed $app_name)")
+                if [[ $(app_is_installed $app_name) == "1" ]]; then
+                    APPS_INSTALLED_NAMES+=("$app_name")
+                fi
+            fi
+        fi
+    done
+}
+
 # creates the APPS_AVAILABLE and APPS_CHOSEN arrays based on
 # the given variant name
 function choose_apps_for_variant {
             APPS_AVAILABLE+=("${app_name}")
 
             if grep -q "VARIANTS=" ${filename}; then
-                variants_line=$(cat ${filename} | grep "VARIANTS=")
-                if [[ "$variants_line" == *"'"* ]]; then
-                    variants_list=$(echo "$variants_line" | awk -F '=' '{print $2}' | awk -F "'" '{print $2}')
-                else
-                    variants_list=$(echo "$variants_line" | awk -F '=' '{print $2}' | awk -F '"' '{print $2}')
-                fi
+                variants_list=$(app_variants $filename)
                 if [[ "${variants_list}" == 'all'* || \
                       "${variants_list}" == "$variant_name "* || \
                       "${variants_list}" == *" $variant_name "* || \