Re-initialize the database and don't overwrite it by default.

postsack-cli/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2021"
 description = "Interface with the Postsack mail processing engine from the command-line."
 
 [[bin]]
-name = "postsack"
+name = "postsack-man"
 path = "src/main.rs"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

postsack-cli/Readme.md

@@ -1,3 +1,11 @@
 # Postsack CLI
 
 A minimial command-line interface for the `postsack` engine, allowing non-gui access to functionality.
+
+Use the `postsack-man` (meaning _postsack-manager_) like this…
+
+```
+postsack-man
+```
+
+… to receive help on which functionality is available.

postsack-cli/src/main.rs

@@ -21,10 +21,13 @@ mod options {
         Import {
             /// The path to which to write the database containing all imported data.
             /// 
-            /// Note that it will be overwritten unconditionally.
+            /// Note that we won't refuse an existing database unless --overwrite-database is specified.
             #[clap(short = 's', long, default_value = "./postsack.sqlite")]
             database: PathBuf,
 
+            #[clap(short = 'f', long)]
+            overwrite_database: bool,
+
             /// Emails to be considered your own emails for filtering by Sender.
             #[clap(
                 short = 'e',
@@ -67,6 +70,7 @@ fn main() -> eyre::Result<()> {
     match args.cmds {
         SubCommands::Import {
             database,
+            overwrite_database,
             sender_email,
             email_format,
             emails_folder,
@@ -75,6 +79,13 @@ fn main() -> eyre::Result<()> {
             if !emails_folder.is_dir() {
                 eyre::bail!("The mails directory at '{}' isn't accessible", emails_folder.display())
             }
+
+            if overwrite_database {
+                std::fs::remove_file(&database).ok();
+            } else {
+                eyre::bail!("Refusing to overwrite existing database at '{}'", database.display());
+            }
+
             let config = ps_core::Config::new(
                 Some(database.clone()),
                 emails_folder,