2 files changed, 78 insertions, 0 deletions
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index d086d5b..a25e955 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -1 +1,2 @@
+pub mod sql;
 pub mod sync;
diff --git a/src/cmd/sql.rs b/src/cmd/sql.rs
new file mode 100644
index 0000000..ae398b5
--- /dev/null
+++ b/src/cmd/sql.rs
@@ -0,0 +1,77 @@
+use db;
+use paths;
+
+pub fn run(query: &str, tsv: bool) -> failure::Fallible<()> {
+    let db = db::DB::new(&paths::db_path()?)?;
+
+    let rows_cell = std::cell::Cell::new(Some(vec![]));
+    let cols = db.query(query, |row| {
+        let display_row: Vec<String> = (0..row.column_count())
+            .map(|i| row.get_raw(i))
+            .map(|v| format_value(&v))
+            .collect();
+        let mut rows = rows_cell.replace(None).unwrap();
+        rows.push(display_row);
+        rows_cell.replace(Some(rows));
+    })?;
+
+    let rows = rows_cell.into_inner().unwrap();
+
+    if tsv {
+        print_tsv(&rows);
+    }
+    else {
+        print_table(&cols, &rows);
+    }
+
+    Ok(())
+}
+
+fn print_table(cols: &[String], rows: &[Vec<String>]) {
+    let widths = column_widths(&cols, &rows);
+
+    print_row(&widths, &cols);
+    let border: Vec<String> = widths.iter().map(|l| "-".repeat(*l)).collect();
+    println!("{}", &border.join("-+-"));
+
+    for row in rows {
+        print_row(&widths, &row);
+    }
+}
+
+fn print_tsv(rows: &[Vec<String>]) {
+    for row in rows {
+        println!("{}", row.join("\t"));
+    }
+}
+
+fn format_value(v: &rusqlite::types::ValueRef) -> String {
+    match v {
+        rusqlite::types::ValueRef::Null => "null".to_string(),
+        rusqlite::types::ValueRef::Integer(i) => format!("{}", i),
+        rusqlite::types::ValueRef::Real(f) => format!("{}", f),
+        rusqlite::types::ValueRef::Text(s) => format!("{}", s),
+        rusqlite::types::ValueRef::Blob(b) => format!("{:?}", b),
+    }
+}
+
+fn column_widths(cols: &[String], rows: &[Vec<String>]) -> Vec<usize> {
+    let mut max_widths: Vec<usize> = cols.iter().map(|s| s.len()).collect();
+    for row in rows {
+        for (i, col) in row.iter().enumerate() {
+            if col.len() > max_widths[i] {
+                max_widths[i] = col.len();
+            }
+        }
+    }
+    max_widths
+}
+
+fn print_row(widths: &[usize], row: &[String]) {
+    let fixed_width_row: Vec<String> = row
+        .iter()
+        .zip(widths.iter())
+        .map(|(s, width)| format!("{:width$}", s, width=width))
+        .collect();
+    println!("{}", &fixed_width_row.join(" | "));
+}