Warn on empty filters

Closes #29

src/config.rs

@@ -183,6 +183,12 @@ impl Config {
                     filters.access.unwrap_or(false),
                 );
 
+                if filter.empty() {
+                    print_warning(
+                        "The configuration does not contain any filters, so no repos will match",
+                    );
+                }
+
                 let repos = match config.provider {
                     RemoteProvider::Github => {
                         match provider::Github::new(filter, token, config.api_url) {

src/grm/main.rs

@@ -55,6 +55,10 @@ fn main() {
                     let filter =
                         provider::Filter::new(args.users, args.groups, args.owner, args.access);
 
+                    if filter.empty() {
+                        print_warning("You did not specify any filters, so no repos will match");
+                    }
+
                     let worktree = args.worktree == "true";
 
                     let repos = match args.provider {
@@ -278,6 +282,10 @@ fn main() {
                         filters.access.unwrap_or(false),
                     );
 
+                    if filter.empty() {
+                        print_warning("You did not specify any filters, so no repos will match");
+                    }
+
                     let repos = match config.provider {
                         provider::RemoteProvider::Github => {
                             match match provider::Github::new(filter, token, config.api_url) {
@@ -383,6 +391,10 @@ fn main() {
                     let filter =
                         provider::Filter::new(args.users, args.groups, args.owner, args.access);
 
+                    if filter.empty() {
+                        print_warning("You did not specify any filters, so no repos will match");
+                    }
+
                     let worktree = args.worktree == "true";
 
                     let repos = match args.provider {

src/provider/mod.rs

@@ -89,6 +89,10 @@ impl Filter {
             access,
         }
     }
+
+    pub fn empty(&self) -> bool {
+        self.users.is_empty() && self.groups.is_empty() && !self.owner && !self.access
+    }
 }
 
 pub enum ApiErrorResponse<T>