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+#!/bin/bash
+# In simple cases, you don't need a config script.
+
+# With a simple config_panel.toml, you can write in the app settings, in the
+# upstream config file or replace complete files (logo ...) and restart services.
+
+# The config scripts allows you to go further, to handle specific cases
+# (validation of several interdependent fields, specific getter/setter for a value,
+# display dynamic informations or choices, pre-loading of config type .cube... ).
+
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source /usr/share/yunohost/helpers
+
+ynh_abort_if_errors
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+install_dir=$(ynh_app_setting_get --app="$app" --key=install_dir)
+
+#=================================================
+# SPECIFIC GETTERS FOR TOML SHORT KEY
+#=================================================
+
+get__amount() {
+    # Here we can imagine to have an API call to stripe to know the amount of donation during a month
+    local amount=200
+
+    # It's possible to change some properties of the question by overriding it:
+    if [ "$amount" -gt 100 ]; then
+    cat << EOF
+style: success
+value: $amount
+ask:
+  en: A lot of donation this month: **$amount €**
+EOF
+    else
+    cat << EOF
+style: danger
+value: $amount
+ask:
+  en: Not so much donation this month: $amount €
+EOF
+    fi
+}
+
+get__prices() {
+    local prices
+    prices="$(grep "DONATION\['" "$install_dir/settings.py" | sed -r "s@^DONATION\['([^']*)'\]\['([^']*)'\] = '([^']*)'@\1/\2/\3@g" | sed -z 's/\n/,/g;s/,$/\n/')"
+    if [ "$prices" == "," ]; then
+        # Return YNH_NULL if you prefer to not return a value at all.
+        echo YNH_NULL
+    else
+        echo "$prices"
+    fi
+}
+
+
+#=================================================
+# SPECIFIC VALIDATORS FOR TOML SHORT KEYS
+#=================================================
+validate__publishable_key() {
+
+    # We can imagine here we test if the key is really a publishable key
+    (is_secret_key "$publishable_key") &&
+        echo 'This key seems to be a secret key'
+}
+
+#=================================================
+# SPECIFIC SETTERS FOR TOML SHORT KEYS
+#=================================================
+set__prices() {
+
+    #---------------------------------------------
+    # IMPORTANT: setters are triggered only if a change is detected
+    #---------------------------------------------
+    for price in $(echo "$prices" | sed "s/,/ /"); do
+        frequency=$(echo "$price" | cut -d/ -f1)
+        currency=$(echo "$price" | cut -d/ -f2)
+        price_id=$(echo "$price" | cut -d/ -f3)
+        sed "d/DONATION\['$frequency'\]\['$currency'\]" "$install_dir/settings.py"
+
+        echo "DONATION['$frequency']['$currency'] = '$price_id'" >> "$install_dir/settings.py"
+    done
+
+    #---------------------------------------------
+    # IMPORTANT: to be able to upgrade properly, you have to save the value in settings too
+    #---------------------------------------------
+    ynh_app_setting_set --app="$app" --key=prices --value="$prices"
+}
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+ynh_app_config_run "$1"