libripgrep: initial commit introducing libripgrep

libripgrep is not any one library, but rather, a collection of libraries
that roughly separate the following key distinct phases in a grep
implementation:

  1. Pattern matching (e.g., by a regex engine).
  2. Searching a file using a pattern matcher.
  3. Printing results.

Ultimately, both (1) and (3) are defined by de-coupled interfaces, of
which there may be multiple implementations. Namely, (1) is satisfied by
the `Matcher` trait in the `grep-matcher` crate and (3) is satisfied by
the `Sink` trait in the `grep2` crate. The searcher (2) ties everything
together and finds results using a matcher and reports those results
using a `Sink` implementation.

Closes #162

68 files changed, 18010 insertions, 20 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 18a99ced..ff324797 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -25,6 +25,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "base64"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "bitflags"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -38,6 +47,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "byteorder"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "cc"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "cfg-if"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -61,6 +80,11 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "dtoa"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "encoding_rs"
 version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -71,7 +95,7 @@ dependencies = [
 
 [[package]]
 name = "encoding_rs_io"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "encoding_rs 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -124,6 +148,73 @@ dependencies = [
 ]
 
 [[package]]
+name = "grep-matcher"
+version = "0.0.1"
+dependencies = [
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "grep-pcre2"
+version = "0.0.1"
+dependencies = [
+ "grep-matcher 0.0.1",
+ "pcre2 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "grep-printer"
+version = "0.0.1"
+dependencies = [
+ "base64 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "grep-matcher 0.0.1",
+ "grep-regex 0.0.1",
+ "grep-searcher 0.0.1",
+ "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "grep-regex"
+version = "0.0.1"
+dependencies = [
+ "grep-matcher 0.0.1",
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "grep-searcher"
+version = "0.0.1"
+dependencies = [
+ "bytecount 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs_io 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "grep-matcher 0.0.1",
+ "grep-regex 0.0.1",
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "grep2"
+version = "0.1.8"
+dependencies = [
+ "grep-matcher 0.0.1",
+ "grep-printer 0.0.1",
+ "grep-regex 0.0.1",
+ "grep-searcher 0.0.1",
+]
+
+[[package]]
 name = "ignore"
 version = "0.4.3"
 dependencies = [
@@ -135,12 +226,17 @@ dependencies = [
  "regex 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "same-file 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "itoa"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "lazy_static"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -184,6 +280,49 @@ dependencies = [
 ]
 
 [[package]]
+name = "pcre2"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pcre2-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pcre2-sys"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pkg-config"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "proc-macro2"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "quote"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rand"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -214,7 +353,7 @@ dependencies = [
  "aho-corasick 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -259,6 +398,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "safemem"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "same-file"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -267,6 +411,31 @@ dependencies = [
 ]
 
 [[package]]
+name = "serde"
+version = "1.0.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "serde_derive"
+version = "1.0.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.14.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "simd"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -277,6 +446,16 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "syn"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "tempdir"
 version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -313,11 +492,10 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@@ -331,12 +509,9 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "unreachable"
-version = "1.0.0"
+name = "unicode-xid"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "utf8-ranges"
@@ -344,11 +519,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "walkdir"
 version = "2.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
index ffa253f0..ec6ee1b5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,17 @@ name = "integration"
 path = "tests/tests.rs"
 
 [workspace]
-members = ["grep", "globset", "ignore"]
+members = [
+  "globset",
+  "grep",
+  "grep2",
+  "grep-matcher",
+  "grep-pcre2",
+  "grep-printer",
+  "grep-regex",
+  "grep-searcher",
+  "ignore",
+]
 
 [dependencies]
 atty = "0.2.11"
@@ -72,10 +82,12 @@ features = ["suggestions", "color"]
 [features]
 avx-accel = [
   "bytecount/avx-accel",
+  "grep2