implement backend command

src/commands.rs

@@ -18,6 +18,7 @@ pub mod month;
 pub mod list;
 pub mod out;
 pub mod resume;
+pub mod backend;
 
 pub trait Command<'a> {
     type Args: TryFrom<&'a ArgMatches<'a>>;

src/commands/backend.rs

@@ -0,0 +1,25 @@
+use std::process::{Command, Stdio};
+
+use crate::error::Result;
+use crate::config::Config;
+use crate::error::Error::*;
+
+pub struct BackendCommand;
+
+impl BackendCommand {
+    pub fn handle(config: &Config) -> Result<()> {
+        let status = Command::new("sqlite3")
+            .arg(&config.database_file)
+            .stdin(Stdio::inherit())
+            .stdout(Stdio::inherit())
+            .stderr(Stdio::inherit())
+            .output().map_err(|e| Sqlite3CommandFailed(e))?
+            .status;
+
+        if status.success() {
+            Ok(())
+        } else {
+            Err(Sqlite3CommandFailedUnkown)
+        }
+    }
+}

src/error.rs

@@ -158,6 +158,14 @@ Is there a permissions issue? Here's the underlaying error:
         path: PathBuf,
         error: String,
     },
+
+    #[error("Trying to run system command sqlite3 failed with error:
+
+{0}")]
+    Sqlite3CommandFailed(std::io::Error),
+
+    #[error("Trying to run system command sqlite3 failed")]
+    Sqlite3CommandFailedUnkown,
 }
 
 pub type Result<T> = result::Result<T, Error>;

src/main.rs

@@ -13,12 +13,16 @@ use tiempo::commands::{
     Command, r#in::InCommand, display::DisplayCommand, sheet::SheetCommand,
     today::TodayCommand, yesterday::YesterdayCommand, week::WeekCommand,
     month::MonthCommand, list::ListCommand, out::OutCommand,
-    resume::ResumeCommand,
+    resume::ResumeCommand, backend::BackendCommand,
 };
 
 fn error_trap(matches: ArgMatches) -> error::Result<()> {
     let config = Config::read()?;
 
+    if let Some(_matches) = matches.subcommand_matches("backend") {
+        return BackendCommand::handle(&config);
+    }
+
     let mut conn = SqliteDatabase::from_path_or_create(&config.database_file)?;
     let mut out = io::stdout();
     let mut err = io::stderr();