printer: drop dependency on serde_derive

As suggested by @epage[1].

Ad hoc timings on my i7-12900K:

    before cargo build: 4.91s
    before cargo build release: 8.05s
    after cargo build: 4.69s
    after cargo build release: 7.83s

... pretty underwhelming if you ask me. Ah well. And on my M2 mac mini:

    before cargo build: 6.18s
    before cargo build release: 14.50s
    after cargo build: 5.52s
    after cargo build release: 13.44s

Still kind of underwhelming, but definitely better. It shaves a full
second off of compile times in release mode. I went back to my
i7-12900K, but passed `-j1` to `cargo build` to force single threaded
mode:

    before cargo build: 19.44s
    before cargo build release: 50.64s
    after cargo build: 16.76s
    after cargo build release: 48.00s

Which seems pretty consistent with the modest improvements above.

Looking at `cargo build --timings`, the beefiest chunk of time is spent
in compiling `regex-automata`, by far. This is fine because it's core
functionality. I wish a fast general purpose regex engine with its
internals exposed as a separately versioned library didn't require so
much code... Blech.

[1]: https://old.reddit.com/r/rust/comments/17rd8ww/faster_compilation_with_the_parallel_frontend_in/k8igjlg/

4 files changed, 202 insertions, 107 deletions

diff --git a/crates/printer/Cargo.toml b/crates/printer/Cargo.toml
index 4193d3d1..10537c53 100644
--- a/crates/printer/Cargo.toml
+++ b/crates/printer/Cargo.toml
@@ -16,7 +16,7 @@ edition = "2021"
 
 [features]
 default = ["serde"]
-serde = ["dep:base64", "dep:serde", "dep:serde_derive", "dep:serde_json"]
+serde = ["dep:base64", "dep:serde", "dep:serde_json"]
 
 [dependencies]
 base64 = { version = "0.21.4", optional = true }
@@ -26,7 +26,6 @@ grep-searcher = { version = "0.1.11", path = "../searcher" }
 log = "0.4.5"
 termcolor = "1.3.0"
 serde = { version = "1.0.193", optional = true }
-serde_derive = { version = "1.0.193", optional = true }
 serde_json = { version = "1.0.107", optional = true }
 
 [dev-dependencies]
diff --git a/crates/printer/src/jsont.rs b/crates/printer/src/jsont.rs
index 5d901041..6e5e85df 100644
--- a/crates/printer/src/jsont.rs
+++ b/crates/printer/src/jsont.rs
@@ -8,13 +8,6 @@
 
 use std::{borrow::Cow, path::Path};
 
-use {base64, serde::Serializer, serde_derive::Serialize};
-
-use crate::stats::Stats;
-
-#[derive(Serialize)]
-#[serde(tag = "type", content = "data")]
-#[serde(rename_all = "snake_case")]
 pub(crate) enum Message<'a> {
     Begin(Begin<'a>),
     End(End<'a>),
@@ -22,51 +15,145 @@ pub(crate) enum Message<'a> {
     Context(Context<'a>),
 }
 
-#[derive(Serialize)]
+impl<'a> serde::Serialize for Message<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Message", 2)?;
+        match *self {
+            Message::Begin(ref msg) => {
+                state.serialize_field("type", &"begin")?;
+                state.serialize_field("data", msg)?;
+            }
+            Message::End(ref msg) => {
+                state.serialize_field("type", &"end")?;
+                state.serialize_field("data", msg)?;
+            }
+            Message::Match(ref msg) => {
+                state.serialize_field("type", &"match")?;
+                state.serialize_field("data", msg)?;
+            }
+            Message::Context(ref msg) => {
+                state.serialize_field("type", &"context")?;
+                state.serialize_field("data", msg)?;
+            }
+        }
+        state.end()
+    }
+}
+
 pub(crate) struct Begin<'a> {
-    #[serde(serialize_with = "ser_path")]
     pub(crate) path: Option<&'a Path>,
 }
 
-#[derive(Serialize)]
+impl<'a> serde::Serialize for Begin<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Begin", 1)?;
+        state.serialize_field("path", &self.path.map(Data::from_path))?;
+        state.end()
+    }
+}
+
 pub(crate) struct End<'a> {
-    #[serde(serialize_with = "ser_path")]
     pub(crate) path: Option<&'a Path>,
     pub(crate) binary_offset: Option<u64>,
-    pub(crate) stats: Stats,
+    pub(crate) stats: crate::stats::Stats,
+}
+
+impl<'a> serde::Serialize for End<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("End", 3)?;
+        state.serialize_field("path", &self.path.map(Data::from_path))?;
+        state.serialize_field("binary_offset", &self.binary_offset)?;
+        state.serialize_field("stats", &self.stats)?;
+        state.end()
+    }
 }
 
-#[derive(Serialize)]
 pub(crate) struct Match<'a> {
-    #[serde(serialize_with = "ser_path")]
     pub(crate) path: Option<&'a Path>,
-    #[serde(serialize_with = "ser_bytes")]
     pub(crate) lines: &'a [u8],
     pub(crate) line_number: Option<u64>,
     pub(crate) absolute_offset: u64,
     pub(crate) submatches: &'a [SubMatch<'a>],
 }
 
-#[derive(Serialize)]
+impl<'a> serde::Serialize for Match<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Match", 5)?;
+        state.serialize_field("path", &self.path.map(Data::from_path))?;
+        state.serialize_field("lines", &Data::from_bytes(self.lines))?;
+        state.serialize_field("line_number", &self.line_number)?;
+        state.serialize_field("absolute_offset", &self.absolute_offset)?;
+        state.serialize_field("submatches", &self.submatches)?;
+        state.end()
+    }
+}
+
 pub(crate) struct Context<'a> {
-    #[serde(serialize_with = "ser_path")]
     pub(crate) path: Option<&'a Path>,
-    #[serde(serialize_with = "ser_bytes")]
     pub(crate) lines: &'a [u8],
     pub(crate) line_number: Option<u64>,
     pub(crate) absolute_offset: u64,
     pub(crate) submatches: &'a [SubMatch<'a>],
 }
 
-#[derive(Serialize)]
+impl<'a> serde::Serialize for Context<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Context", 5)?;
+        state.serialize_field("path", &self.path.map(Data::from_path))?;
+        state.serialize_field("lines", &Data::from_bytes(self.lines))?;
+        state.serialize_field("line_number", &self.line_number)?;
+        state.serialize_field("absolute_offset", &self.absolute_offset)?;
+        state.serialize_field("submatches", &self.submatches)?;
+        state.end()
+    }
+}
+
 pub(crate) struct SubMatch<'a> {
-    #[serde(rename = "match")]
-    #[serde(serialize_with = "ser_bytes")]
     pub(crate) m: &'a [u8],
     pub(crate) start: usize,
     pub(crate) end: usize,
 }
 
+impl<'a> serde::Serialize for SubMatch<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("SubMatch", 3)?;
+        state.serialize_field("match", &Data::from_bytes(self.m))?;
+        state.serialize_field("start", &self.start)?;
+        state.serialize_field("end", &self.end)?;
+        state.end()
+    }
+}
+
 /// Data represents things that look like strings, but may actually not be
 /// valid UTF-8. To handle this, `Data` is serialized as an object with one
 /// of two keys: `text` (for valid UTF-8) or `bytes` (for invalid UTF-8).
@@ -74,16 +161,10 @@ pub(crate) struct SubMatch<'a> {
 /// The happy path is valid UTF-8, which streams right through as-is, since
 /// it is natively supported by JSON. When invalid UTF-8 is found, then it is
 /// represented as arbitrary bytes and base64 encoded.
-#[derive(Clone, Debug, Hash, PartialEq, Eq, Serialize)]
-#[serde(untagged)]
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
 enum Data<'a> {
-    Text {
-        text: Cow<'a, str>,
-    },
-    Bytes {
-        #[serde(serialize_with = "to_base64")]
-        bytes: &'a [u8],
-    },
+    Text { text: Cow<'a, str> },
+    Bytes { bytes: &'a [u8] },
 }
 
 impl<'a> Data<'a> {
@@ -115,29 +196,22 @@ impl<'a> Data<'a> {
     }
 }
 
-fn to_base64<T, S>(bytes: T, ser: S) -> Result<S::Ok, S::Error>
-where
-    T: AsRef<[u8]>,
-    S: Serializer,
-{
-    use base64::engine::{general_purpose::STANDARD, Engine};
-    ser.serialize_str(&STANDARD.encode(&bytes))
-}
-
-fn ser_bytes<T, S>(bytes: T, ser: S) -> Result<S::Ok, S::Error>
-where
-    T: AsRef<[u8]>,
-    S: Serializer,
-{
-    use serde::Serialize;
-    Data::from_bytes(bytes.as_ref()).serialize(ser)
-}
-
-fn ser_path<P, S>(path: &Option<P>, ser: S) -> Result<S::Ok, S::Error>
-where
-    P: AsRef<Path>,
-    S: Serializer,
-{
-    use serde::Serialize;
-    path.as_ref().map(|p| Data::from_path(p.as_ref())).serialize(ser)
+impl<'a> serde::Serialize for Data<'a> {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Data", 1)?;
+        match *self {
+            Data::Text { ref text } => state.serialize_field("text", text)?,
+            Data::Bytes { bytes } => {
+                use base64::engine::{general_purpose::STANDARD, Engine};
+                let encoded = STANDARD.encode(bytes);
+                state.serialize_field("bytes", &encoded)?;
+            }
+        }
+        state.end()
+    }
 }
diff --git a/crates/printer/src/stats.rs b/crates/printer/src/stats.rs
index f1898c0b..555401b3 100644
--- a/crates/printer/src/stats.rs
+++ b/crates/printer/src/stats.rs
@@ -10,7 +10,6 @@ use crate::util::NiceDuration;
 /// When statistics are reported by a printer, they correspond to all searches
 /// executed with that printer.
 #[derive(Clone, Debug, Default, PartialEq, Eq)]
-#[cfg_attr(feature = "serde", derive(serde_derive::Serialize))]
 pub struct Stats {
     elapsed: NiceDuration,
     searches: u64,
@@ -21,49 +20,6 @@ pub struct Stats {
     matches: u64,
 }
 
-impl Add for Stats {
-    type Output = Stats;
-
-    fn add(self, rhs: Stats) -> Stats {
-        self + &rhs
-    }
-}
-
-impl<'a> Add<&'a Stats> for Stats {
-    type Output = Stats;
-
-    fn add(self, rhs: &'a Stats) -> Stats {
-        Stats {
-            elapsed: NiceDuration(self.elapsed.0 + rhs.elapsed.0),
-            searches: self.searches + rhs.searches,
-            searches_with_match: self.searches_with_match
-                + rhs.searches_with_match,
-            bytes_searched: self.bytes_searched + rhs.bytes_searched,
-            bytes_printed: self.bytes_printed + rhs.bytes_printed,
-            matched_lines: self.matched_lines + rhs.matched_lines,
-            matches: self.matches + rhs.matches,
-        }
-    }
-}
-
-impl AddAssign for Stats {
-    fn add_assign(&mut self, rhs: Stats) {
-        *self += &rhs;
-    }
-}
-
-impl<'a> AddAssign<&'a Stats> for Stats {
-    fn add_assign(&mut self, rhs: &'a Stats) {
-        self.elapsed.0 += rhs.elapsed.0;
-        self.searches += rhs.searches;
-        self.searches_with_match += rhs.searches_with_match;
-        self.bytes_searched += rhs.bytes_searched;
-        self.bytes_printed += rhs.bytes_printed;
-        self.matched_lines += rhs.matched_lines;
-        self.matches += rhs.matches;
-    }
-}
-
 impl Stats {
     /// Return a new value for tracking aggregate statistics across searches.
     ///
@@ -147,3 +103,69 @@ impl Stats {
         self.matches += n;
     }
 }
+
+impl Add for Stats {
+    type Output = Stats;
+
+    fn add(self, rhs: Stats) -> Stats {
+        self + &rhs
+    }
+}
+
+impl<'a> Add<&'a Stats> for Stats {
+    type Output = Stats;
+
+    fn add(self, rhs: &'a Stats) -> Stats {
+        Stats {
+            elapsed: NiceDuration(self.elapsed.0 + rhs.elapsed.0),
+            searches: self.searches + rhs.searches,
+            searches_with_match: self.searches_with_match
+                + rhs.searches_with_match,
+            bytes_searched: self.bytes_searched + rhs.bytes_searched,
+            bytes_printed: self.bytes_printed + rhs.bytes_printed,
+            matched_lines: self.matched_lines + rhs.matched_lines,
+            matches: self.matches + rhs.matches,
+        }
+    }
+}
+
+impl AddAssign for Stats {
+    fn add_assign(&mut self, rhs: Stats) {
+        *self += &rhs;
+    }
+}
+
+impl<'a> AddAssign<&'a Stats> for Stats {
+    fn add_assign(&mut self, rhs: &'a Stats) {
+        self.elapsed.0 += rhs.elapsed.0;
+        self.searches += rhs.searches;
+        self.searches_with_match += rhs.searches_with_match;
+        self.bytes_searched += rhs.bytes_searched;
+        self.bytes_printed += rhs.bytes_printed;
+        self.matched_lines += rhs.matched_lines;
+        self.matches += rhs.matches;
+    }
+}
+
+#[cfg(feature = "serde")]
+impl serde::Serialize for Stats {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        s: S,
+    ) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeStruct;
+
+        let mut state = s.serialize_struct("Stats", 7)?;
+        state.serialize_field("elapsed", &self.elapsed)?;
+        state.serialize_field("searches", &self.searches)?;
+        state.serialize_field(
+            "searches_with_match",
+            &self.searches_with_match,
+        )?;
+        state.serialize_field("bytes_searched", &self.bytes_searched)?;
+        state.serialize_field("bytes_printed", &self.bytes_printed)?;
+        state.serialize_field("matched_lines", &self.matched_lines)?;
+        state.serialize_field("matches", &self.matches)?;
+        state.end()
+    }
+}
diff --git a/crates/printer/src/util.rs b/crates/printer/src/util.rs
index db19504c..04f9e129 100644
--- a/crates/printer/src/util.rs
+++ b/crates/printer/src/util.rs
@@ -8,9 +8,6 @@ use {
     },
 };
 
-#[cfg(feature = "serde")]
-use serde::{Serialize, Serializer};
-
 use crate::{hyperlink::HyperlinkPath, MAX_LOOK_AHEAD};
 
 /// A type for handling replacements while amortizing allocation.
@@ -385,11 +382,14 @@ impl NiceDuration {
 }
 
 #[cfg(feature = "serde")]
-impl Serialize for NiceDuration {
-    fn serialize<S: Serializer>(&self, ser: S) -> Result<S::Ok, S::Error> {
+impl serde::Serialize for NiceDuration {
+    fn serialize<S: serde::Serializer>(
+        &self,
+        ser: S,
+    ) -> Result<S::Ok, S::Error> {
         use serde::ser::SerializeStruct;
 
-        let mut state = ser.serialize_struct("Duration", 2)?;
+        let mut state = ser.serialize_struct("Duration", 3)?;
         state.serialize_field("secs", &self.0.as_secs())?;
         state.serialize_field("nanos", &self.0.subsec_nanos())?;
         state.serialize_field("human", &format!("{}", self))?;