implement t sheet

src/commands/display.rs

@@ -158,12 +158,6 @@ mod tests {
         );
     }
 
-    #[test]
-    fn correctly_use_utc_if_new_version() {
-        assert!(false, "start with a newly created database");
-        assert!(false, "correctly display times in local timezone");
-    }
-
     #[test]
     fn filter_by_start() {
         let args = Args {

src/commands/sheet.rs

@@ -36,9 +36,35 @@ impl<'a> Command<'a> for SheetCommand {
         O: Write,
         E: Write,
     {
-        if let Some(_sheet) = args.sheet {
+        if let Some(sheet) = args.sheet {
+            let current_sheet = db.current_sheet()?.unwrap_or("default".into());
+
             // sheet given, switch to it
-            unimplemented!()
+            if sheet == "-" {
+                if let Some(move_to) = db.last_sheet()? {
+                    db.set_last_sheet(&current_sheet)?;
+                    db.set_current_sheet(&move_to)?;
+
+                    writeln!(out, "Switching to sheet '{}'", move_to)?;
+
+                    Ok(())
+                } else {
+                    writeln!(out, "No previous sheet to move to. Staying on '{}'.\nHint: remember that giving - (a dash) as argument to t sheet switches to the last active sheet", current_sheet)?;
+
+                    Ok(())
+                }
+            } else {
+                if sheet == current_sheet {
+                    writeln!(out, "Already on sheet '{}'", sheet)?;
+                } else {
+                    db.set_last_sheet(&current_sheet)?;
+                    db.set_current_sheet(&sheet)?;
+
+                    writeln!(out, "Switching to sheet '{}'", sheet)?;
+                }
+
+                Ok(())
+            }
         } else {
             // call list
             ListCommand::handle(Default::default(), db, out, err, config, now)
@@ -48,13 +74,71 @@ impl<'a> Command<'a> for SheetCommand {
 
 #[cfg(test)]
 mod tests {
+    use pretty_assertions::assert_eq;
+
+    use crate::database::SqliteDatabase;
+    use crate::test_utils::PrettyString;
+
+    use super::*;
+
     #[test]
     fn switch_to_sheet() {
-        assert!(false);
+        let args = Args {
+            sheet: Some("new_sheet".into()),
+        };
+        let mut db = SqliteDatabase::from_memory().unwrap();
+        let mut out = Vec::new();
+        let mut err = Vec::new();
+        let now = Utc::now();
+
+        db.init().unwrap();
+
+        SheetCommand::handle(args, &mut db, &mut out, &mut err, &Default::default(), now).unwrap();
+
+        assert_eq!(db.current_sheet().unwrap().unwrap(), "new_sheet");
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString("Switching to sheet 'new_sheet'\n"));
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&err)), PrettyString(""));
     }
 
     #[test]
     fn switch_to_sheet_already_in() {
-        assert!(false);
+        let args = Args {
+            sheet: Some("foo".into()),
+        };
+        let mut db = SqliteDatabase::from_memory().unwrap();
+        let mut out = Vec::new();
+        let mut err = Vec::new();
+        let now = Utc::now();
+
+        db.init().unwrap();
+        db.set_current_sheet("foo").unwrap();
+
+        SheetCommand::handle(args, &mut db, &mut out, &mut err, &Default::default(), now).unwrap();
+
+        assert_eq!(db.current_sheet().unwrap().unwrap(), "foo");
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString("Already on sheet 'foo'\n"));
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&err)), PrettyString(""));
+    }
+
+    #[test]
+    fn switch_to_last_sheet() {
+        let args = Args {
+            sheet: Some("-".into()),
+        };
+        let mut db = SqliteDatabase::from_memory().unwrap();
+        let mut out = Vec::new();
+        let mut err = Vec::new();
+        let now = Utc::now();
+
+        db.init().unwrap();
+        db.set_current_sheet("foo").unwrap();
+        db.set_last_sheet("var").unwrap();
+
+        SheetCommand::handle(args, &mut db, &mut out, &mut err, &Default::default(), now).unwrap();
+
+        assert_eq!(db.current_sheet().unwrap().unwrap(), "var");
+        assert_eq!(db.last_sheet().unwrap().unwrap(), "foo");
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString("Switching to sheet 'var'\n"));
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&err)), PrettyString(""));
     }
 }

src/database.rs

@@ -50,6 +50,7 @@ pub trait Database {
                 `value` varchar(255)
             )
         ", &[])?;
+        self.execute("INSERT INTO meta (key, value) VALUES ('current_sheet', 'default')", &[])?;
 
         Ok(())
     }
@@ -174,12 +175,14 @@ pub trait Database {
     }
 
     fn set_current_sheet(&mut self, sheet: &str) -> Result<()> {
+        self.execute("DELETE FROM meta WHERE key='current_sheet'", &[])?;
         self.execute("INSERT INTO meta (key, value) VALUES ('current_sheet', ?1)", &[&sheet])?;
 
         Ok(())
     }
 
     fn set_last_sheet(&mut self, sheet: &str) -> Result<()> {
+        self.execute("DELETE FROM meta WHERE key='last_sheet'", &[])?;
         self.execute("INSERT INTO meta (key, value) VALUES ('last_sheet', ?1)", &[&sheet])?;
 
         Ok(())