Add support for interval - operator.

Author: AmrDeveloper

crates/gitql-ast/src/interval.rs

@@ -21,6 +21,17 @@ impl Interval {
         result.seconds += interval.seconds;
         result
     }
+
+    pub fn sub(&self, interval: &Interval) -> Interval {
+        let mut result = self.clone();
+        result.years -= interval.years;
+        result.months -= interval.months;
+        result.days -= interval.days;
+        result.hours -= interval.hours;
+        result.minutes -= interval.minutes;
+        result.seconds -= interval.seconds;
+        result
+    }
 }
 
 impl fmt::Display for Interval {

crates/gitql-ast/src/types/interval.rs

@@ -25,4 +25,12 @@ impl DataType for IntervalType {
     fn add_op_result_type(&self, _other: &Box<dyn DataType>) -> Box<dyn DataType> {
         Box::new(IntervalType)
     }
+
+    fn can_perform_sub_op_with(&self) -> Vec<Box<dyn DataType>> {
+        vec![Box::new(IntervalType)]
+    }
+
+    fn sub_op_result_type(&self, _other: &Box<dyn DataType>) -> Box<dyn DataType> {
+        Box::new(IntervalType)
+    }
 }

crates/gitql-core/src/values/interval.rs

@@ -49,4 +49,12 @@ impl Value for IntervalValue {
         }
         Err("Unexpected type to perform `+` with".to_string())
     }
+
+    fn sub_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String> {
+        if let Some(other_interval) = other.as_any().downcast_ref::<IntervalValue>() {
+            let result = self.interval.sub(&other_interval.interval);
+            return Ok(Box::new(IntervalValue::new(result)));
+        }
+        Err("Unexpected type to perform `-` with".to_string())
+    }
 }

docs/index.md

@@ -24,6 +24,7 @@ SELECT 1 + 2
 SELECT LEN("Git Query Language")
 SELECT "One" IN ("One", "Two", "Three")
 SELECT "Git Query Language" LIKE "%Query%"
+SELECT INTERVAL '1 year 2 mons 3 days 04:05:06.789'
 
 SET @arr = [1, 2, 3];
 SELECT [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
@@ -32,25 +33,27 @@ SELECT @arr[1:2], @arr[2:], @arr[:2];
 
 SELECT DISTINCT title AS tt FROM commits
 SELECT author_name, COUNT(author_name) AS commit_num FROM commits GROUP BY author_name, author_email ORDER BY commit_num DESC LIMIT 10
-SELECT commit_count FROM branches WHERE commit_count BETWEEN 0 .. 10
+SELECT commit_count FROM branches WHERE commit_count BETWEEN 0 AND 10
 
 SELECT * FROM refs WHERE type = "branch"
 SELECT * FROM refs ORDER BY type
 
 SELECT * FROM commits
 SELECT author_name, author_email FROM commits
 SELECT author_name, author_email FROM commits ORDER BY author_name DESC, author_email ASC
-SELECT author_name, author_email FROM commits WHERE name LIKE "%gmail%" ORDER BY author_name
-SELECT * FROM commits WHERE LOWER(name) = "amrdeveloper"
+SELECT author_name, author_email FROM commits WHERE author_email LIKE "%gmail%" ORDER BY author_name
+SELECT * FROM commits WHERE LOWER(author_name) = "amrdeveloper"
 SELECT author_name FROM commits GROUP By author_name
-SELECT author_name FROM commits GROUP By author_name having author_name = "AmrDeveloper"
+SELECT author_name FROM commits GROUP By author_name HAVING author_name = "AmrDeveloper"
 
 SELECT * FROM branches
 SELECT * FROM branches WHERE is_head = true
 SELECT name, LEN(name) FROM branches
 
 SELECT * FROM tags
 SELECT * FROM tags OFFSET 1 LIMIT 1
+
+SELECT path, count() AS changes_count, SUM(insertions) AS additions, SUM(removals) AS removes FROM diffs_changes GROUP BY path ORDER BY changes_count DESC
 ```
 
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