fix: include string

Author: faretek1

datetime.gs

@@ -1,4 +1,6 @@
 %include inflator/time
+%include inflator/string
 
 %include inflator/datetime/src/struct
 %include inflator/datetime/src/to
+%include inflator/datetime/src/get

demo/main.gs

@@ -4,5 +4,8 @@ costumes "blank.svg";
 
 onflag {main;}
 proc main {
-    say dt_str(DT_NOW());
+    local datetime d = DT_NOW();
+    say dt_str(d);
+
+    say dt_get_weekday_number(d);
 }

inflator.toml

@@ -4,4 +4,5 @@ version = "v0.0.0"
 username = "inflated-goboscript"
 
 [dependencies]
-time = "time"
+time = "time"
+string = "string"

src/get.gs

@@ -0,0 +1,24 @@
+# 'getter functions' for datetime struct
+
+list DT_WEEKDAYS = [
+    "Monday",
+    "Tuesday",
+    "Wednesday",
+    "Thursday",
+    "Friday",
+    "Saturday",
+    "Sunday"
+];
+
+# Get the day of the week for a date `$d`
+# https://www.geeksforgeeks.org/dsa/zellers-congruence-find-day-date/
+func dt_get_weekday_number(datetime d) {
+    # 0 = Saturday, 1 = Sunday, 2 = Monday, ..., 6 = Friday
+    # uses zeller's rule
+    local q = $d.day;
+    local m = $d.month;
+    local K = $d.year % 100;
+    local J = $d.year // 100;
+
+    return floor(q + (13*(m+1))/5 + K + K/4 + J/4 + 5*J) % 7;
+}

src/struct.gs

@@ -1,5 +1,7 @@
 # Struct definition and constructors
 
+# also serves the same role as python's datetime.date
+# Gregorian date
 struct datetime {
     year = 1970,
     month = 1,