update flag.nu with more details of how flags work and how to pass data to them (#154)

engine-q/nu_101/flag.nu

@@ -27,3 +27,48 @@ def flag [
 ] {
   echo $flag
 }
+
+# Write out the flags you entered
+def flag_details [myint: int, mystring: string] {
+  echo "myint is " $myint | str collect
+  echo "mystring is " $mystring | str collect
+}
+
+# Get the data passed into the flags
+def get_flag [
+    --test_int(-i): int # The test intlocation
+    --test_string(-s): string # The test string
+    ] {
+    let is_int_empty = ($test_int == $nothing)
+    let is_string_empty = ($test_string == $nothing)
+
+    let no_int_no_string = ($is_int_empty == $true && $is_string_empty == $true)
+    let no_int_with_string = ($is_int_empty == $true && $is_string_empty == $false)
+    let with_int_no_string = ($is_int_empty == $false && $is_string_empty == $true)
+    let with_int_with_string = ($is_int_empty == $false && $is_string_empty == $false)
+
+    echo 'no int and no string ' $no_int_no_string | str collect
+    echo 'no int with string ' $no_int_with_string | str collect
+    echo 'with int and no string ' $with_int_no_string | str collect
+    echo 'with int and with string ' $with_int_with_string | str collect
+
+    if $no_int_no_string {
+        (flag_details 1 "blue")
+    } else if $no_int_with_string {
+        (flag_details 1 $test_string)
+    } else if $with_int_no_string {
+        (flag_details $test_int "blue")
+    } else if $with_int_with_string {
+        (flag_details $test_int $test_string)
+    }
+
+
+}
+
+# To run this call
+# > get_flag
+# it will default to int 1 and string blue
+# > get_flag -i 2
+# This changes to int 2 and string blue
+# > get_flag -i 3 -s green
+# This changes to int 3 and string green