add group iter

generator-native/Cargo.lock

@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "generator-native"
+version = "0.1.0"

generator-native/src/iter/group.rs

@@ -0,0 +1,57 @@
+/// Group iterator output every n values into `Vec<T>`.
+pub struct GroupIter<T,I>
+where I: Iterator<Item=T>
+{
+    buffer: Vec<T>,
+    iter: I,
+    group_at: usize,
+}
+
+impl<T,I> Iterator for GroupIter<T,I>
+where I: Iterator<Item=T>
+{
+    type Item = Vec<T>;
+
+    fn next(&mut self) -> Option<Self::Item>
+    {
+	while self.buffer.len() < self.group_at
+	{
+	    if let Some(value) = self.iter.next() {
+		self.buffer.push(value)
+	    } else {
+		return self.swap();
+	    }
+	}
+	self.swap()
+    }
+}
+
+impl<T,I> GroupIter<T,I>
+where I: Iterator<Item=T>
+{
+    fn swap(&mut self) -> Option<Vec<T>>
+    {
+	let buff = {
+	    let next = Vec::with_capacity(self.group_at);
+	    std::mem::replace(&mut self.buffer, next)
+	};
+	if buff.len() > 0 {
+	    Some(buff)
+	} else {
+	    None
+	}
+    }
+}
+
+use super::*;
+pub trait GroupExt: Iterator + Sized {
+    fn group_at(self, at: usize) -> GroupIter<<Self as Iterator>::Item, Self>
+    {
+	GroupIter{
+	    group_at: at,
+	    iter: self,
+	    buffer: Vec::with_capacity(at),
+	}
+    }
+}
+impl<T> GroupExt for T where T: Iterator{}

generator-native/src/iter/mod.rs

@@ -0,0 +1,3 @@
+
+mod group;
+pub use group::*;

generator-native/src/main.rs

@@ -1,3 +1,5 @@
+mod iter;
+
 fn main() {
     println!("Hello, world!");
 }

generator-native/target/.rustc_info.json

@@ -0,0 +1 @@
+{"rustc_fingerprint":8463141123970612326,"outputs":{"1164083562126845933":["rustc 1.43.1\nbinary: rustc\ncommit-hash: unknown\ncommit-date: unknown\nhost: x86_64-unknown-linux-gnu\nrelease: 1.43.1\nLLVM version: 10.0\n",""],"4476964694761187371":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/usr\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n",""]},"successes":{}}

generator-native/target/debug/.fingerprint/generator-native-41640df8cf96c4d9/bin-generator_native-41640df8cf96c4d9

@@ -0,0 +1 @@
+831912060a22ce51

generator-native/target/debug/.fingerprint/generator-native-41640df8cf96c4d9/bin-generator_native-41640df8cf96c4d9.json

@@ -0,0 +1 @@
+{"rustc":11801549080318583226,"features":"[]","target":6091357260924395754,"profile":14996655781355331481,"path":1036222786711178230,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/generator-native-41640df8cf96c4d9/dep-bin-generator_native-41640df8cf96c4d9"}}],"rustflags":[],"metadata":15184557155527542140}

generator-native/target/debug/.fingerprint/generator-native-41640df8cf96c4d9/invoked.timestamp

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+This file has an mtime of when this was started.

generator-native/target/debug/.fingerprint/generator-native-41640df8cf96c4d9/output

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+{"message":"unused import: `super::*`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/iter/group.rs","byte_start":781,"byte_end":789,"line_start":46,"line_end":46,"column_start":5,"column_end":13,"is_primary":true,"text":[{"text":"use super::*;","highlight_start":5,"highlight_end":13}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_imports)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove the whole `use` item","code":null,"level":"help","spans":[{"file_name":"src/iter/group.rs","byte_start":777,"byte_end":790,"line_start":46,"line_end":46,"column_start":1,"column_end":14,"is_primary":true,"text":[{"text":"use super::*;","highlight_start":1,"highlight_end":14}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused import: `super::*`\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/iter/group.rs:46:5\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m46\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0muse super::*;\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(unused_imports)]` on by default\u001b[0m\n\n"}

generator-native/target/debug/deps/generator_native-41640df8cf96c4d9.d

@@ -0,0 +1,7 @@
+/home/avril/work/sfexec/generator-native/target/debug/deps/generator_native-41640df8cf96c4d9: src/main.rs src/iter/mod.rs src/iter/group.rs
+
+/home/avril/work/sfexec/generator-native/target/debug/deps/generator_native-41640df8cf96c4d9.d: src/main.rs src/iter/mod.rs src/iter/group.rs
+
+src/main.rs:
+src/iter/mod.rs:
+src/iter/group.rs:

generator-native/target/debug/generator-native.d

@@ -0,0 +1 @@
+/home/avril/work/sfexec/generator-native/target/debug/generator-native: /home/avril/work/sfexec/generator-native/src/iter/group.rs /home/avril/work/sfexec/generator-native/src/iter/mod.rs /home/avril/work/sfexec/generator-native/src/main.rs