add pre_deploy.sh script for dotter

.dotter/handlebars_helpers/flatten_table.rhai

@@ -0,0 +1,30 @@
+/*
+* Flatten a table into a list of values.
+* The table has to be in the form of
+* ```toml
+* [table.subtable]
+* variable1 = ["value1", "value2"]
+*
+* [table.subtable]
+* variable2 = ["value3", "value4"]
+*
+* then we use it in handlerbars like this:
+*
+* {{ flatten_table table.subtable }}
+*
+* and it will return an array with all the arrays of subtable
+*/
+
+if type_of(params[0]) != "map" {
+  return;
+}
+
+let table = params[0];
+
+let result = [];
+
+for value in table.values() {
+  result.append(value);
+}
+
+result

.dotter/handlebars_helpers/header.rhai

@@ -0,0 +1,48 @@
+let x_padding = hash["padding"] ?? 50;
+
+let header = #{
+  x_padding: x_padding,
+  out: "",
+  append: |suffix| {
+    this.out += suffix + "\n";
+  },
+  append_center: |suffix| {
+
+    let suffix_len = suffix.len();
+    let padding = this.x_padding - suffix_len / 2;
+    let fill = "";
+    fill.pad(padding, " ");
+
+    this.out += fill + suffix.to_upper() + fill + "\n";
+  },
+  append_divider: || {
+    let divider = "";
+    divider.pad(this.x_padding * 2, "─");
+
+    this.append(divider);
+  },
+  open_echo: || {
+    this.out += "echo -e '\n";
+  },
+  close_echo: || {
+    this.out += "'";
+  },
+  to_string: || {
+    return this.out;
+  }
+};
+
+header.open_echo();
+
+header.append_divider();
+
+
+params.for_each(|idx| {
+  header.append_center(this);
+});
+
+header.append_divider();
+header.close_echo();
+
+return header.to_string();
+