From 9f5dd9dad6b13476bab2c6eb3c6528f8ad49311a Mon Sep 17 00:00:00 2001
From: Till Höppner
Date: Thu, 25 Feb 2016 06:48:03 +0100
Subject: Refactor... everything.

---
 ops/src/lib.rs | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 ops/src/lib.rs

(limited to 'ops/src/lib.rs')

diff --git a/ops/src/lib.rs b/ops/src/lib.rs
new file mode 100644
index 0000000..8cd5607
--- /dev/null
+++ b/ops/src/lib.rs
@@ -0,0 +1,127 @@
+extern crate blist;
+extern crate ilc_base;
+
+mod ageset;
+pub mod freq;
+
+pub mod parse {
+    use ilc_base::{self, Context, Decode};
+    use std::io::BufRead;
+    pub fn parse(ctx: &Context, input: &mut BufRead, decoder: &mut Decode) -> ilc_base::Result<()> {
+        for e in decoder.decode(&ctx, input) {
+            try!(e);
+        }
+        Ok(())
+    }
+}
+
+pub mod convert {
+    use ilc_base::{self, Context, Decode, Encode};
+    use std::io::{BufRead, Write};
+
+    pub fn convert(ctx: &Context,
+                   input: &mut BufRead,
+                   decoder: &mut Decode,
+                   output: &mut Write,
+                   encoder: &Encode)
+                   -> ilc_base::Result<()> {
+        for e in decoder.decode(&ctx, input) {
+            try!(encoder.encode(&ctx, output, &try!(e)));
+        }
+        Ok(())
+    }
+}
+
+pub mod seen {
+    use ilc_base::{self, Context, Decode, Encode, Event};
+    use std::io::{BufRead, Write};
+
+    pub fn seen(nick: &str,
+                ctx: &Context,
+                input: &mut BufRead,
+                decoder: &mut Decode,
+                output: &mut Write,
+                encoder: &Encode)
+                -> ilc_base::Result<()> {
+        let mut last: Option<Event> = None;
+        for e in decoder.decode(&ctx, input) {
+            let m: Event = try!(e);
+            if m.ty.involves(nick) &&
+               last.as_ref().map_or(true,
+                                    |last| m.time.as_timestamp() > last.time.as_timestamp()) {
+                last = Some(m)
+            }
+        }
+        if let Some(ref m) = last {
+            try!(encoder.encode(&ctx, output, m));
+        }
+        Ok(())
+    }
+}
+
+pub mod sort {
+    use ilc_base::{self, Context, Decode, Encode, Event};
+    use std::io::{BufRead, Write};
+
+    pub fn sort(ctx: &Context,
+                input: &mut BufRead,
+                decoder: &mut Decode,
+                output: &mut Write,
+                encoder: &Encode)
+                -> ilc_base::Result<()> {
+        let mut events: Vec<Event> = decoder.decode(&ctx, input)
+                                            .flat_map(Result::ok)
+                                            .collect();
+
+        events.sort_by(|a, b| a.time.cmp(&b.time));
+        for e in events {
+            try!(encoder.encode(&ctx, output, &e));
+        }
+        Ok(())
+    }
+}
+
+pub mod dedup {
+    use std::io::{BufRead, Write};
+    use std::hash::{Hash, Hasher};
+    use ageset::AgeSet;
+    use ilc_base::{self, Context, Decode, Encode, Event};
+
+    #[derive(Clone, Debug, PartialEq, Eq)]
+    pub struct NoTimeHash<'a>(pub Event<'a>);
+
+    impl<'a> Hash for NoTimeHash<'a> {
+        fn hash<H>(&self, state: &mut H)
+            where H: Hasher
+        {
+            self.0.ty.hash(state);
+            self.0.channel.hash(state);
+        }
+    }
+
+    pub fn dedup(ctx: &Context,
+                 input: &mut BufRead,
+                 decoder: &mut Decode,
+                 output: &mut Write,
+                 encoder: &Encode)
+                 -> ilc_base::Result<()> {
+        let mut backlog = AgeSet::new();
+
+        for e in decoder.decode(&ctx, input) {
+            if let Ok(e) = e {
+                let newest_event = e.clone();
+                backlog.prune(move |a: &NoTimeHash| {
+                    let age = newest_event.time.as_timestamp() - a.0.time.as_timestamp();
+                    age > 5000
+                });
+                // write `e` if it's a new event
+                let n = NoTimeHash(e);
+                if !backlog.contains(&n) {
+                    try!(encoder.encode(&ctx, output, &n.0));
+                    backlog.push(n);
+                }
+            }
+        }
+        Ok(())
+    }
+}
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