From 1692dd0fe4ba244e4f290f1680f3ad73f0900b37 Mon Sep 17 00:00:00 2001
From: Ryan Lopopolo <rjl@hyperbo.la>
Date: Sat, 4 Jul 2020 14:14:57 -0700
Subject: [PATCH 1/3] Turn off all regex deps except unicode

This removes dependencies on aho-corasick, memchr, thread_local, and
lazy_static.

version-sync is a build and test-time dependency that does not need to
be super fast.
---
 Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 3772917..e9ffb8d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,4 +28,4 @@ proc-macro2 = { version = "1.0", features = ["span-locations"] }
 toml = "0.5"
 url = "2.0"
 itertools = "0.9"
-regex = "1.1"
+regex = { version = "1.1", default-features = false, features = ["std", "unicode"] }

From 13f07ce3514400d389e1e798b5685eae3b3a50c5 Mon Sep 17 00:00:00 2001
From: Ryan Lopopolo <rjl@hyperbo.la>
Date: Sat, 4 Jul 2020 14:17:27 -0700
Subject: [PATCH 2/3] Implement join free function for joining iterators

This commit re-implements itertools::join in the helpers module. The
implementation is small -- less than 15 lines of code -- which does not
seem to justify a dependency on an entire external crate.

This enables removing the itertools dependency and transitively removes
either.
---
 Cargo.toml     |  1 -
 src/helpers.rs | 23 ++++++++++++++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index e9ffb8d..1986de4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,5 +27,4 @@ syn = { version = "1.0", features = ["full"] }
 proc-macro2 = { version = "1.0", features = ["span-locations"] }
 toml = "0.5"
 url = "2.0"
-itertools = "0.9"
 regex = { version = "1.1", default-features = false, features = ["std", "unicode"] }
diff --git a/src/helpers.rs b/src/helpers.rs
index 991d8c0..48b7950 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -1,14 +1,35 @@
+use std::fmt::Display;
 use std::fs::File;
 use std::io::{self, Read};
 use std::result;
 
-use itertools::join;
 use semver_parser::range::{Op, VersionReq};
 use semver_parser::version::Version;
 
 /// The common result type, our errors will be simple strings.
 pub type Result<T> = result::Result<T, String>;
 
+fn join<T>(iter: T, sep: &str) -> String
+where
+    T: IntoIterator,
+    T::Item: Display,
+{
+    let mut buf = String::new();
+    let mut iter = iter.into_iter();
+    if let Some(item) = iter.next() {
+        let item = item.to_string();
+        buf.push_str(&item);
+    } else {
+        return buf;
+    }
+    for item in iter {
+        buf.push_str(sep);
+        let item = item.to_string();
+        buf.push_str(&item);
+    }
+    buf
+}
+
 /// Return all data from `path`.
 pub fn read_file(path: &str) -> io::Result<String> {
     let mut file = File::open(path)?;

From e5a7dc958d7ddacbe6f1460ac9b28bc980f39a22 Mon Sep 17 00:00:00 2001
From: Ryan Lopopolo <rjl@hyperbo.la>
Date: Sat, 4 Jul 2020 14:26:36 -0700
Subject: [PATCH 3/3] Bump regex to 1.3

regex 1.3 is the first to expose the feature flags we're disabling.

https://github.com/rust-lang/regex/pull/613
---
 Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 1986de4..5bb24fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,4 +27,4 @@ syn = { version = "1.0", features = ["full"] }
 proc-macro2 = { version = "1.0", features = ["span-locations"] }
 toml = "0.5"
 url = "2.0"
-regex = { version = "1.1", default-features = false, features = ["std", "unicode"] }
+regex = { version = "1.3", default-features = false, features = ["std", "unicode"] }