Revert "remove --list-possible-fetchers since all fetchers are possible"

This reverts commit c854935b1a.

README.md

@@ -53,6 +53,7 @@ Options:
   -O, --overwrite-str <NAME> <STRING>  same as --overwrite, but accepts strings instead Nix
                                        expressions
   -l, --list-fetchers                  List all available fetchers
+  -L, --list-possible-fetchers         List all fetchers that can be generated without --fetcher
   -h, --help                           Print help information
   -V, --version                        Print version information
 ```
@@ -63,7 +64,7 @@ Options:
 - `nix-prefetch` relies on FOD which is slow, `nurl` tries to use alternatives when possible.
 - `nix-prefetch` supports arbitrary expressions (planned for `nurl`) and file attributes.
 - `nix-prefetch` is more configurable and has an interface similar to `nix-build`.
-- `nurl` has some nice features dedicated to generated packages (`--indent`, `--list-fetchers`).
+- `nurl` has some nice features dedicated to generated packages (`--indent`, `--list-possible-fetchers`).
 
 ## Changelog
 

src/cli.rs

@@ -66,6 +66,10 @@ pub struct Opts {
     /// List all available fetchers
     #[arg(short, long, group = "command")]
     pub list_fetchers: bool,
+
+    /// List all fetchers that can be generated without --fetcher
+    #[arg(short = 'L', long, group = "command")]
+    pub list_possible_fetchers: bool,
 }
 
 #[derive(Clone, Debug, ValueEnum)]

src/main.rs

@@ -30,13 +30,12 @@ pub enum GitScheme {
 fn main() -> Result<()> {
     let opts = Opts::parse();
 
-    if opts.list_fetchers {
+    if opts.list_fetchers || opts.list_possible_fetchers {
         let mut out = stdout().lock();
-        for fetcher in FetcherFunction::value_variants()
-            .iter()
-            .filter_map(ValueEnum::to_possible_value)
-        {
-            writeln!(out, "{}", fetcher.get_name())?;
+        for fetcher in FetcherFunction::value_variants() {
+            if let Some(fetcher) = fetcher.to_possible_value() {
+                writeln!(out, "{}", fetcher.get_name())?;
+            }
         }
         return Ok(());
     }