Issue #112: Support query datetime from diffs table

docs/structure/tables.md

@@ -39,15 +39,16 @@ show tables
 
 ### Diffs table
 
-| Name          | Type   | Description              |
-| ------------- | ------ | ------------------------ |
-| commit_id     | Text   | Commit id                |
-| name          | Text   | Author name              |
-| email         | Text   | Author email             |
-| insertions    | Number | Number of inserted lines |
-| deletions     | Number | Number of deleted lines  |
-| files_changed | Number | Number of file changed   |
-| repo          | Text   | Repository full path     |
+| Name          | Type     | Description              |
+| ------------- | -------- | ------------------------ |
+| commit_id     | Text     | Commit id                |
+| name          | Text     | Author name              |
+| email         | Text     | Author email             |
+| insertions    | Number   | Number of inserted lines |
+| deletions     | Number   | Number of deleted lines  |
+| files_changed | Number   | Number of file changed   |
+| datetime      | DateTime | Commit date time         |
+| repo          | Text     | Repository full path     |
 
 ---
 
@@ -86,4 +87,4 @@ SHOW TABLES;
 ```sql
 DESCRIBE commits;
 DESCRIBE branches;
-```
+```

src/git_data_provider.rs

@@ -317,6 +317,7 @@ fn select_diffs(repo: &gix::Repository, selected_columns: &[String]) -> Result<V
     for commit_info in revwalk {
         let commit_info = commit_info.unwrap();
         let commit = commit_info.id().object().unwrap().into_commit();
+        let commit_ref = commit.decode().unwrap();
 
         let mut values: Vec<Value> = Vec::with_capacity(selected_columns.len());
 
@@ -328,17 +329,25 @@ fn select_diffs(repo: &gix::Repository, selected_columns: &[String]) -> Result<V
             }
 
             if field_name == "name" {
-                let name = commit.author().unwrap().name.to_string();
+                let name = commit_ref.author().name.to_string();
                 values.push(Value::Text(name));
                 continue;
             }
 
             if field_name == "email" {
-                let email = commit.author().unwrap().email.to_string();
+                let email = commit_ref.author().email.to_string();
                 values.push(Value::Text(email));
                 continue;
             }
 
+            if field_name == "datetime" {
+                let time_stamp = commit_info
+                    .commit_time
+                    .unwrap_or_else(|| commit_ref.time().seconds);
+                values.push(Value::DateTime(time_stamp));
+                continue;
+            }
+
             if field_name == "repo" {
                 values.push(Value::Text(repo_path.to_string()));
                 continue;
@@ -416,7 +425,6 @@ fn select_tags(repo: &gix::Repository, selected_columns: &[String]) -> Result<Ve
     let repo_path = repo.path().to_str().unwrap().to_string();
 
     let names_len = selected_columns.len() as i64;
-
     let mut rows: Vec<Row> = vec![];
 
     for tag_ref in tag_names.flatten() {

src/git_schema.rs

@@ -71,6 +71,7 @@ pub fn tables_fields_names() -> &'static HashMap<&'static str, Vec<&'static str>
                 "insertions",
                 "deletions",
                 "files_changed",
+                "datetime",
                 "repo",
             ],
         );