feat(picker): add `mingling_support` feature and `is_flag` field

Rename the `core` feature to `mingling_support` in `mingling_picker` and
propagate it through `mingling_picker_macros`.  Add the `is_flag` field
to `PickerTag` to indicate participation in parsing after a `--`
separator.  Remove empty `seek.rs` file.

7 files changed, 30 insertions, 5 deletions

diff --git a/mingling/Cargo.toml b/mingling/Cargo.toml
index 2cd517e..c3f9511 100644
--- a/mingling/Cargo.toml
+++ b/mingling/Cargo.toml
@@ -50,7 +50,7 @@ dispatch_tree = ["mingling_core/dispatch_tree", "mingling_macros/dispatch_tree"]
 repl = ["mingling_core/repl", "mingling_macros/repl"]
 comp = ["mingling_core/comp", "mingling_macros/comp"]
 parser = ["dep:size"]
-picker = ["dep:mingling_picker"]
+picker = ["dep:mingling_picker", "mingling_picker/mingling_support"]
 pathf = ["mingling_core/pathf", "mingling_macros/pathf"]
 
 structural_renderer = [
diff --git a/mingling_picker/Cargo.toml b/mingling_picker/Cargo.toml
index a585a39..4cbab39 100644
--- a/mingling_picker/Cargo.toml
+++ b/mingling_picker/Cargo.toml
@@ -9,7 +9,7 @@ readme = "README.md"
 description = "Mingling's lightweight argument parser"
 
 [features]
-core = ["dep:mingling_core"]
+mingling_support = ["dep:mingling_core", "mingling_picker_macros/mingling_support"]
 
 [dependencies]
 mingling_core = { workspace = true, optional = true }
diff --git a/mingling_picker/src/lib.rs b/mingling_picker/src/lib.rs
index fa45d71..d2885d9 100644
--- a/mingling_picker/src/lib.rs
+++ b/mingling_picker/src/lib.rs
@@ -23,8 +23,8 @@ pub mod macros {
     pub use mingling_picker_macros::*;
 }
 
-#[cfg(feature = "core")]
+#[cfg(feature = "mingling_support")]
 mod corebind;
 
-#[cfg(feature = "core")]
+#[cfg(feature = "mingling_support")]
 pub use corebind::*;
diff --git a/mingling_picker/src/parselib/seek.rs b/mingling_picker/src/parselib/seek.rs
deleted file mode 100644
index 8b13789..0000000
--- a/mingling_picker/src/parselib/seek.rs
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/mingling_picker/src/tag.rs b/mingling_picker/src/tag.rs
index 6f91630..a64cf6e 100644
--- a/mingling_picker/src/tag.rs
+++ b/mingling_picker/src/tag.rs
@@ -13,6 +13,7 @@ use crate::{Pickable, PickerFlag};
 /// * `positional` - Whether this tag is a positional argument (no `-` or `--` prefix).
 /// * `optional` - Whether this tag is optional or required.
 /// * `multi` - Whether this tag can accept multiple values.
+/// * `is_flag` - Whether this tag participates in parsing after a `--` separator.
 pub struct PickerTag<'a> {
     /// The short form of the tag, e.g. `'n'` for `-n`.
     pub short: Option<char>,
@@ -26,6 +27,8 @@ pub struct PickerTag<'a> {
     pub optional: bool,
     /// Whether this tag can accept multiple values.
     pub multi: bool,
+    /// Whether this tag participates in parsing after a `--` separator.
+    pub is_flag: bool,
 }
 
 impl<'a, T> From<PickerFlag<'a, T>> for PickerTag<'a>
@@ -53,6 +56,7 @@ where
             positional: value.positional,
             optional: false,
             multi: false,
+            is_flag: false,
         }
     }
 }
@@ -79,6 +83,7 @@ impl<'a, T: Pickable<'a> + Default> From<&'a PickerFlag<'a, T>> for PickerTag<'a
             positional: value.positional,
             optional: false,
             multi: false,
+            is_flag: false,
         }
     }
 }
@@ -93,6 +98,7 @@ impl<'a> PickerTag<'a> {
             positional: false,
             optional: false,
             multi: false,
+            is_flag: false,
         }
     }
 
@@ -132,6 +138,12 @@ impl<'a> PickerTag<'a> {
         self
     }
 
+    /// Mark the tag as a flag that participates in parsing after `--`.
+    pub fn with_is_flag(mut self, is_flag: bool) -> Self {
+        self.is_flag = is_flag;
+        self
+    }
+
     /// Set the short flag (e.g., `'n'` for `-n`).
     pub fn set_short(&mut self, short: char) -> &mut Self {
         self.short = Some(short);
@@ -167,6 +179,12 @@ impl<'a> PickerTag<'a> {
         self.multi = multi;
         self
     }
+
+    /// Set whether this tag participates in parsing after a `--` separator.
+    pub fn set_is_flag(&mut self, is_flag: bool) -> &mut Self {
+        self.is_flag = is_flag;
+        self
+    }
 }
 
 impl<'a> Default for PickerTag<'a> {
diff --git a/mingling_picker_macros/Cargo.toml b/mingling_picker_macros/Cargo.toml
index 5bab6e5..58488ea 100644
--- a/mingling_picker_macros/Cargo.toml
+++ b/mingling_picker_macros/Cargo.toml
@@ -11,6 +11,9 @@ description = "Mingling's lightweight argument parser macros"
 [lib]
 proc-macro = true
 
+[features]
+mingling_support = []
+
 [dependencies]
 syn.workspace = true
 quote.workspace = true
diff --git a/mingling_picker_macros/src/flag.rs b/mingling_picker_macros/src/flag.rs
index 0d65382..71302ae 100644
--- a/mingling_picker_macros/src/flag.rs
+++ b/mingling_picker_macros/src/flag.rs
@@ -69,7 +69,12 @@ pub(crate) fn flag(input: TokenStream) -> TokenStream {
             })
             .unwrap_or(TS2::new());
 
+        #[cfg(feature = "mingling_support")]
         let import = quote! { ::mingling::picker::PickerFlag };
+
+        #[cfg(not(feature = "mingling_support"))]
+        let import = quote! { ::mingling_picker::PickerFlag };
+
         if ty.is_some() {
             quote! { #import::<#ty_ts> }
         } else {