refactor!: remove legacy parser feature and migrate to picker

The legacy `parser` feature and its module tree (`mingling::parser`,
`Argument`, `Picker`, `Pickable`, etc.) have been fully removed and
replaced by the `picker` feature powered by `arg-picker`.

BREAKING CHANGE: Remove `parser` feature and use `picker` instead.
Migration guide: Replace `features = ["parser"]` with
`features = ["picker"]` and update API usage per the provided table.

3 files changed, 25 insertions, 14 deletions

diff --git a/examples/example-structural-renderer/Cargo.lock b/examples/example-structural-renderer/Cargo.lock
index ac4cbba..cf2cfe3 100644
--- a/examples/example-structural-renderer/Cargo.lock
+++ b/examples/example-structural-renderer/Cargo.lock
@@ -3,6 +3,23 @@
 version = 4
 
 [[package]]
+name = "arg-picker"
+version = "0.2.0"
+dependencies = [
+ "arg-picker-macros",
+ "just_fmt",
+]
+
+[[package]]
+name = "arg-picker-macros"
+version = "0.2.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
 name = "equivalent"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -66,10 +83,10 @@ dependencies = [
 name = "mingling"
 version = "0.5.0"
 dependencies = [
+ "arg-picker",
  "mingling_core",
  "mingling_macros",
  "serde",
- "size",
 ]
 
 [[package]]
@@ -183,12 +200,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "size"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b6709c7b6754dca1311b3c73e79fcce40dd414c782c66d88e8823030093b02b"
-
-[[package]]
 name = "syn"
 version = "2.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/examples/example-structural-renderer/Cargo.toml b/examples/example-structural-renderer/Cargo.toml
index e29e9c3..2851303 100644
--- a/examples/example-structural-renderer/Cargo.toml
+++ b/examples/example-structural-renderer/Cargo.toml
@@ -11,7 +11,7 @@ path = "../../mingling"
 features = [
     "structural_renderer",
     "yaml_serde_fmt",
-    "parser",
+    "picker",
 ]
 
 [workspace]
diff --git a/examples/example-structural-renderer/src/main.rs b/examples/example-structural-renderer/src/main.rs
index eca87fc..a1bddbd 100644
--- a/examples/example-structural-renderer/src/main.rs
+++ b/examples/example-structural-renderer/src/main.rs
@@ -17,8 +17,8 @@
 //! member_age: 22
 //! ```
 
-use mingling::prelude::*;
-use mingling::{parser::Picker, setup::StructuralRendererSetup, Grouped, StructuralData};
+use mingling::setup::picker::StructuralRendererSetup;
+use mingling::{Grouped, StructuralData, prelude::*};
 use serde::Serialize;
 use std::io::Write;
 
@@ -55,10 +55,10 @@ struct Info {
 
 #[chain]
 fn parse_render(prev: EntryRender) -> Next {
-    let (name, age) = Picker::new(prev.inner)
-        .pick::<String>(())
-        .pick::<i32>(())
-        .unpack();
+    let (name, age) = prev
+        .pick_or_default(&arg![String])
+        .pick_or_default(&arg![i32])
+        .unwrap();
     Info { name, age }.to_render()
 }