Upgrade heck to 0.4.1 am: 3e60f5b81b am: 6b88be41d8

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/heck/+/2440576

Change-Id: I00acc1830e4bba23d8996ac1a7f57532a42b5140
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

10 files changed, 1288 insertions, 16 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 192652c..1bae39b 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,6 +1,6 @@
 {
   "git": {
-    "sha1": "dbcfc7b8db8e532d1fad44518cf73e88d5212161"
+    "sha1": "76a8274f948fbe3551413dc09026b733aca71995"
   },
   "path_in_vcs": ""
 }
\ No newline at end of file
diff --git a/Android.bp b/Android.bp
index d880332..002c550 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,8 +1,6 @@
 // This file is generated by cargo2android.py --config cargo2android.json.
 // Do not modify this file as changes will be overridden on upgrade.
 
-
-
 package {
     default_applicable_licenses: ["external_rust_crates_heck_license"],
 }
@@ -44,7 +42,7 @@ rust_test {
     host_supported: true,
     crate_name: "heck",
     cargo_env_compat: true,
-    cargo_pkg_version: "0.4.0",
+    cargo_pkg_version: "0.4.1",
     srcs: ["src/lib.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
@@ -66,7 +64,7 @@ rust_library {
     host_supported: true,
     crate_name: "heck",
     cargo_env_compat: true,
-    cargo_pkg_version: "0.4.0",
+    cargo_pkg_version: "0.4.1",
     srcs: ["src/lib.rs"],
     edition: "2018",
     features: [
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e02914..c0f2f24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.4.1
+
+Improvements:
+
+- Add Train-Case support
+
 # 0.4.0
 
 Breaking changes:
diff --git a/Cargo.toml b/Cargo.toml
index b72cceb..7990368 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,16 +12,28 @@
 [package]
 edition = "2018"
 name = "heck"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["Without Boats <woboats@gmail.com>"]
-include = ["src/**/*", "LICENSE-*", "README.md", "CHANGELOG.md"]
+include = [
+    "src/**/*",
+    "LICENSE-*",
+    "README.md",
+    "CHANGELOG.md",
+]
 description = "heck is a case conversion library."
 homepage = "https://github.com/withoutboats/heck"
 documentation = "https://docs.rs/heck"
 readme = "README.md"
-keywords = ["string", "case", "camel", "snake", "unicode"]
+keywords = [
+    "string",
+    "case",
+    "camel",
+    "snake",
+    "unicode",
+]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/withoutboats/heck"
+
 [dependencies.unicode-segmentation]
 version = "1.2.0"
 optional = true
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 1de9796..2ad25de 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,7 +1,7 @@
 [package]
 authors = ["Without Boats <woboats@gmail.com>"]
 name = "heck"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "heck is a case conversion library."
diff --git a/METADATA b/METADATA
index 78f1f80..7f8d66f 100644
--- a/METADATA
+++ b/METADATA
@@ -1,3 +1,7 @@
+# This project was upgraded with external_updater.
+# Usage: tools/external_updater/updater.sh update rust/crates/heck
+# For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md
+
 name: "heck"
 description: "heck is a case conversion library."
 third_party {
@@ -7,14 +11,13 @@ third_party {
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/heck/heck-0.4.0.crate"
+    value: "https://static.crates.io/crates/heck/heck-0.4.1.crate"
   }
-  version: "0.4.0"
-  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  version: "0.4.1"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2022
-    month: 9
-    day: 7
+    year: 2023
+    month: 2
+    day: 16
   }
 }
diff --git a/README.md b/README.md
index 5099339..5e052e7 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ indicators are dropped, except insofar as CamelCase capitalizes the first word.
 5. SHOUTY_SNAKE_CASE
 6. Title Case
 7. SHOUTY-KEBAB-CASE
+8. Train-Case
 
 ## Contributing
 
diff --git a/patches/heck-0.3.3.diff b/patches/heck-0.3.3.diff
new file mode 100644
index 0000000..9ab6d50
--- /dev/null
+++ b/patches/heck-0.3.3.diff
@@ -0,0 +1,1164 @@
+diff --git a/0.3.3/Android.bp b/0.3.3/Android.bp
+new file mode 100644
+index 0000000..65601b5
+--- /dev/null
++++ b/0.3.3/Android.bp
+@@ -0,0 +1,69 @@
++// This file is generated by cargo2android.py --config cargo2android.json.
++// Do not modify this file as changes will be overridden on upgrade.
++
++package {
++    default_applicable_licenses: ["external_rust_crates_heck_license_0_3_3"],
++}
++
++// Added automatically by a large-scale-change that took the approach of
++// 'apply every license found to every target'. While this makes sure we respect
++// every license restriction, it may not be entirely correct.
++//
++// e.g. GPL in an MIT project might only apply to the contrib/ directory.
++//
++// Please consider splitting the single license below into multiple licenses,
++// taking care not to lose any license_kind information, and overriding the
++// default license using the 'licenses: [...]' property on targets as needed.
++//
++// For unused files, consider creating a 'fileGroup' with "//visibility:private"
++// to attach the license to, and including a comment whether the files may be
++// used in the current project.
++//
++// large-scale-change included anything that looked like it might be a license
++// text as a license_text. e.g. LICENSE, NOTICE, COPYING etc.
++//
++// Please consider removing redundant or irrelevant files from 'license_text:'.
++// See: http://go/android-license-faq
++license {
++    name: "external_rust_crates_heck_license_0_3_3",
++    visibility: [":__subpackages__"],
++    license_kinds: [
++        "SPDX-license-identifier-Apache-2.0",
++        "SPDX-license-identifier-MIT",
++    ],
++    license_text: [
++        "LICENSE-APACHE",
++        "LICENSE-MIT",
++    ],
++}
++
++rust_test {
++    name: "heck_test_src_lib_deprecated",
++    host_supported: true,
++    crate_name: "heck",
++    cargo_env_compat: true,
++    cargo_pkg_version: "0.3.3",
++    srcs: ["src/lib.rs"],
++    test_suites: ["general-tests"],
++    auto_gen_config: true,
++    test_options: {
++        unit_test: true,
++    },
++    edition: "2018",
++    rustlibs: [
++        "libunicode_segmentation",
++    ],
++}
++
++rust_library {
++    name: "libheck_deprecated",
++    host_supported: true,
++    crate_name: "heck",
++    cargo_env_compat: true,
++    cargo_pkg_version: "0.3.3",
++    srcs: ["src/lib.rs"],
++    edition: "2018",
++    rustlibs: [
++        "libunicode_segmentation",
++    ],
++}
+diff --git a/0.3.3/Cargo.toml b/0.3.3/Cargo.toml
+new file mode 100644
+index 0000000..fc9c28d
+--- /dev/null
++++ b/0.3.3/Cargo.toml
+@@ -0,0 +1,27 @@
++# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
++#
++# When uploading crates to the registry Cargo will automatically
++# "normalize" Cargo.toml files for maximal compatibility
++# with all versions of Cargo and also rewrite `path` dependencies
++# to registry (e.g., crates.io) dependencies
++#
++# If you believe there's an error in this file please file an
++# issue against the rust-lang/cargo repository. If you're
++# editing this file be aware that the upstream Cargo.toml
++# will likely look very different (and much more reasonable)
++
++[package]
++edition = "2018"
++name = "heck"
++version = "0.3.3"
++authors = ["Without Boats <woboats@gmail.com>"]
++include = ["src/**/*", "LICENSE-*", "README.md", "CHANGELOG.md"]
++description = "heck is a case conversion library."
++homepage = "https://github.com/withoutboats/heck"
++documentation = "https://docs.rs/heck"
++readme = "README.md"
++keywords = ["string", "case", "camel", "snake", "unicode"]
++license = "MIT OR Apache-2.0"
++repository = "https://github.com/withoutboats/heck"
++[dependencies.unicode-segmentation]
++version = "1.2.0"
+diff --git a/0.3.3/Cargo.toml.orig b/0.3.3/Cargo.toml.orig
+new file mode 100644
+index 0000000..80acd39
+--- /dev/null
++++ b/0.3.3/Cargo.toml.orig
+@@ -0,0 +1,16 @@
++[package]
++authors = ["Without Boats <woboats@gmail.com>"]
++name = "heck"
++version = "0.3.3"
++edition = "2018"
++license = "MIT OR Apache-2.0"
++description = "heck is a case conversion library."
++homepage = "https://github.com/withoutboats/heck"
++repository = "https://github.com/withoutboats/heck"
++documentation = "https://docs.rs/heck"
++keywords = ["string", "case", "camel", "snake", "unicode"]
++readme = "README.md"
++include = ["src/**/*", "LICENSE-*", "README.md", "CHANGELOG.md"]
++
++[dependencies]
++unicode-segmentation = "1.2.0"
+diff --git a/0.3.3/LICENSE b/0.3.3/LICENSE
+new file mode 120000
+index 0000000..6b579aa
+--- /dev/null
++++ b/0.3.3/LICENSE
+@@ -0,0 +1 @@
++LICENSE-APACHE
+\ No newline at end of file
+diff --git a/0.3.3/LICENSE-APACHE b/0.3.3/LICENSE-APACHE
+new file mode 100644
+index 0000000..16fe87b
+--- /dev/null
++++ b/0.3.3/LICENSE-APACHE
+@@ -0,0 +1,201 @@
++                              Apache License
++                        Version 2.0, January 2004
++                     http://www.apache.org/licenses/
++
++TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+diff --git a/0.3.3/LICENSE-MIT b/0.3.3/LICENSE-MIT
+new file mode 100644
+index 0000000..e69282e
+--- /dev/null
++++ b/0.3.3/LICENSE-MIT
+@@ -0,0 +1,25 @@
++Copyright (c) 2015 The Rust Project Developers
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++DEALINGS IN THE SOFTWARE.
+diff --git a/0.3.3/METADATA b/0.3.3/METADATA
+new file mode 100644
+index 0000000..dd9970c
+--- /dev/null
++++ b/0.3.3/METADATA
+@@ -0,0 +1,19 @@
++name: "heck"
++description: "heck is a case conversion library."
++third_party {
++  url {
++    type: HOMEPAGE
++    value: "https://crates.io/crates/heck"
++  }
++  url {
++    type: ARCHIVE
++    value: "https://static.crates.io/crates/heck/heck-0.3.3.crate"
++  }
++  version: "0.3.3"
++  license_type: NOTICE
++  last_upgrade_date {
++    year: 2021
++    month: 6
++    day: 21
++  }
++}
+diff --git a/0.3.3/MODULE_LICENSE_APACHE2 b/0.3.3/MODULE_LICENSE_APACHE2
+new file mode 100644
+index 0000000..e69de29
+diff --git a/0.3.3/NOTICE b/0.3.3/NOTICE
+new file mode 120000
+index 0000000..7a694c9
+--- /dev/null
++++ b/0.3.3/NOTICE
+@@ -0,0 +1 @@
++LICENSE
+\ No newline at end of file
+diff --git a/0.3.3/OWNERS b/0.3.3/OWNERS
+new file mode 100644
+index 0000000..46fc303
+--- /dev/null
++++ b/0.3.3/OWNERS
+@@ -0,0 +1 @@
++include platform/prebuilts/rust:/OWNERS
+diff --git a/0.3.3/README.md b/0.3.3/README.md
+new file mode 100644
+index 0000000..33f2a5d
+--- /dev/null
++++ b/0.3.3/README.md
+@@ -0,0 +1,63 @@
++# **heck** is a case conversion library
++
++!["I specifically requested the opposite of this."](./no_step_on_snek.png)
++
++This library exists to provide case conversion between common cases like
++CamelCase and snake_case. It is intended to be unicode aware, internally
++consistent, and reasonably well performing.
++
++## Definition of a word boundary
++
++Word boundaries are defined as the "unicode words" defined in the
++`unicode_segmentation` library, as well as within those words in this manner:
++
++1. All underscore characters are considered word boundaries.
++2. If an uppercase character is followed by lowercase letters, a word boundary
++is considered to be just prior to that uppercase character.
++3. If multiple uppercase characters are consecutive, they are considered to be
++within a single word, except that the last will be part of the next word if it
++is followed by lowercase characters (see rule 2).
++
++That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
++segmented `XML|Http|Request`.
++
++Characters not within words (such as spaces, punctuations, and underscores)
++are not included in the output string except as they are a part of the case
++being converted to. Multiple adjacent word boundaries (such as a series of
++underscores) are folded into one. ("hello__world" in snake case is therefore
++"hello_world", not the exact same string). Leading or trailing word boundary
++indicators are dropped, except insofar as CamelCase capitalizes the first word.
++
++## Cases contained in this library:
++
++1. CamelCase
++2. snake_case
++3. kebab-case
++4. SHOUTY_SNAKE_CASE
++5. mixedCase
++6. Title Case
++7. SHOUTY-KEBAB-CASE
++
++## Contributing
++
++PRs of additional well-established cases welcome.
++
++This library is a little bit opinionated (dropping punctuation, for example).
++If that doesn't fit your use case, I hope there is another crate that does. I
++would prefer **not** to receive PRs to make this behavior more configurable.
++
++Bug reports & fixes always welcome. :-)
++
++## MSRV
++
++The minimum supported Rust version for this crate is 1.32.0. This may change in
++minor or patch releases, but we probably won't ever require a very recent
++version. If you would like to have a stronger guarantee than that, please open
++an issue.
++
++## License
++
++heck is distributed under the terms of both the MIT license and the
++Apache License (Version 2.0).
++
++See LICENSE-APACHE and LICENSE-MIT for details.
+diff --git a/0.3.3/TEST_MAPPING b/0.3.3/TEST_MAPPING
+new file mode 100644
+index 0000000..e5f5c4c
+--- /dev/null
++++ b/0.3.3/TEST_MAPPING
+@@ -0,0 +1,27 @@
++// Generated by update_crate_tests.py for tests that depend on this crate.
++{
++  "imports": [
++    {
++      "path": "external/rust/crates/argh"
++    },
++    {
++      "path": "external/rust/crates/base64"
++    }
++  ],
++  "presubmit": [
++    {
++      "name": "authfs_device_test_src_lib"
++    },
++    {
++      "name": "heck_test_src_lib"
++    }
++  ],
++  "presubmit-rust": [
++    {
++      "name": "authfs_device_test_src_lib"
++    },
++    {
++      "name": "heck_test_src_lib"
++    }
++  ]
++}
+diff --git a/0.3.3/cargo2android.json b/0.3.3/cargo2android.json
+new file mode 100644
+index 0000000..d36fb44
+--- /dev/null
++++ b/0.3.3/cargo2android.json
+@@ -0,0 +1,5 @@
++{
++  "device": true,
++  "run": true,
++  "tests": true
++}
+\ No newline at end of file
+diff --git a/0.3.3/src/camel.rs b/0.3.3/src/camel.rs
+new file mode 100644
+index 0000000..6949435
+--- /dev/null
++++ b/0.3.3/src/camel.rs
+@@ -0,0 +1,50 @@
++use crate::{capitalize, transform};
++
++/// This trait defines a camel case conversion.
++///
++/// In CamelCase, word boundaries are indicated by capital letters, including
++/// the first word.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::CamelCase;
++///
++/// let sentence = "We are not in the least afraid of ruins.";
++/// assert_eq!(sentence.to_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
++/// ```
++pub trait CamelCase: ToOwned {
++    /// Convert this type to camel case.
++    fn to_camel_case(&self) -> Self::Owned;
++}
++
++impl CamelCase for str {
++    fn to_camel_case(&self) -> String {
++        transform(self, capitalize, |_| {})
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::CamelCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_camel_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "CamelCase");
++    t!(test2: "This is Human case." => "ThisIsHumanCase");
++    t!(test3: "MixedUP_CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
++    t!(test4: "mixed_up_ snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
++    t!(test5: "kebab-case" => "KebabCase");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
++    t!(test7: "snake_case" => "SnakeCase");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
++    t!(test9: "XΣXΣ baffle" => "XσxςBaffle");
++    t!(test10: "XMLHttpRequest" => "XmlHttpRequest");
++}
+diff --git a/0.3.3/src/kebab.rs b/0.3.3/src/kebab.rs
+new file mode 100644
+index 0000000..75e5978
+--- /dev/null
++++ b/0.3.3/src/kebab.rs
+@@ -0,0 +1,49 @@
++use crate::{lowercase, transform};
++
++/// This trait defines a kebab case conversion.
++///
++/// In kebab-case, word boundaries are indicated by hyphens.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::KebabCase;
++///
++/// let sentence = "We are going to inherit the earth.";
++/// assert_eq!(sentence.to_kebab_case(), "we-are-going-to-inherit-the-earth");
++/// ```
++pub trait KebabCase: ToOwned {
++    /// Convert this type to kebab case.
++    fn to_kebab_case(&self) -> Self::Owned;
++}
++
++impl KebabCase for str {
++    fn to_kebab_case(&self) -> Self::Owned {
++        transform(self, lowercase, |s| s.push('-'))
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::KebabCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_kebab_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "camel-case");
++    t!(test2: "This is Human case." => "this-is-human-case");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixed-up-camel-case-with-some-spaces");
++    t!(test4: "mixed_up_ snake_case with some _spaces" => "mixed-up-snake-case-with-some-spaces");
++    t!(test5: "kebab-case" => "kebab-case");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "shouty-snake-case");
++    t!(test7: "snake_case" => "snake-case");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "this-contains-all-kinds-of-word-boundaries");
++    t!(test9: "XΣXΣ baffle" => "xσxς-baffle");
++    t!(test10: "XMLHttpRequest" => "xml-http-request");
++}
+diff --git a/0.3.3/src/lib.rs b/0.3.3/src/lib.rs
+new file mode 100644
+index 0000000..00a9fbe
+--- /dev/null
++++ b/0.3.3/src/lib.rs
+@@ -0,0 +1,181 @@
++//! **heck** is a case conversion library.
++//!
++//! This library exists to provide case conversion between common cases like
++//! CamelCase and snake_case. It is intended to be unicode aware, internally,
++//! consistent, and reasonably well performing.
++//!
++//! ## Definition of a word boundary
++//!
++//! Word boundaries are defined as the "unicode words" defined in the
++//! `unicode_segmentation` library, as well as within those words in this
++//! manner:
++//!
++//! 1. All underscore characters are considered word boundaries.
++//! 2. If an uppercase character is followed by lowercase letters, a word
++//! boundary is considered to be just prior to that uppercase character.
++//! 3. If multiple uppercase characters are consecutive, they are considered to
++//! be within a single word, except that the last will be part of the next word
++//! if it is followed by lowercase characters (see rule 2).
++//!
++//! That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
++//! segmented `XML|Http|Request`.
++//!
++//! Characters not within words (such as spaces, punctuations, and underscores)
++//! are not included in the output string except as they are a part of the case
++//! being converted to. Multiple adjacent word boundaries (such as a series of
++//! underscores) are folded into one. ("hello__world" in snake case is therefore
++//! "hello_world", not the exact same string). Leading or trailing word boundary
++//! indicators are dropped, except insofar as CamelCase capitalizes the first
++//! word.
++//!
++//! ### Cases contained in this library:
++//!
++//! 1. CamelCase
++//! 2. snake_case
++//! 3. kebab-case
++//! 4. SHOUTY_SNAKE_CASE
++//! 5. mixedCase
++//! 6. Title Case
++//! 7. SHOUTY-KEBAB-CASE
++#![deny(missing_docs)]
++
++mod camel;
++mod kebab;
++mod mixed;
++mod shouty_kebab;
++mod shouty_snake;
++mod snake;
++mod title;
++
++pub use camel::CamelCase;
++pub use kebab::KebabCase;
++pub use mixed::MixedCase;
++pub use shouty_kebab::ShoutyKebabCase;
++pub use shouty_snake::{ShoutySnakeCase, ShoutySnekCase};
++pub use snake::{SnakeCase, SnekCase};
++pub use title::TitleCase;
++
++use unicode_segmentation::UnicodeSegmentation;
++
++fn transform<F, G>(s: &str, with_word: F, boundary: G) -> String
++where
++    F: Fn(&str, &mut String),
++    G: Fn(&mut String),
++{
++    /// Tracks the current 'mode' of the transformation algorithm as it scans
++    /// the input string.
++    ///
++    /// The mode is a tri-state which tracks the case of the last cased
++    /// character of the current word. If there is no cased character
++    /// (either lowercase or uppercase) since the previous word boundary,
++    /// than the mode is `Boundary`. If the last cased character is lowercase,
++    /// then the mode is `Lowercase`. Othertherwise, the mode is
++    /// `Uppercase`.
++    #[derive(Clone, Copy, PartialEq)]
++    enum WordMode {
++        /// There have been no lowercase or uppercase characters in the current
++        /// word.
++        Boundary,
++        /// The previous cased character in the current word is lowercase.
++        Lowercase,
++        /// The previous cased character in the current word is uppercase.
++        Uppercase,
++    }
++
++    let mut out = String::new();
++    let mut first_word = true;
++
++    for word in s.unicode_words() {
++        let mut char_indices = word.char_indices().peekable();
++        let mut init = 0;
++        let mut mode = WordMode::Boundary;
++
++        while let Some((i, c)) = char_indices.next() {
++            // Skip underscore characters
++            if c == '_' {
++                if init == i {
++                    init += 1;
++                }
++                continue;
++            }
++
++            if let Some(&(next_i, next)) = char_indices.peek() {
++                // The mode including the current character, assuming the
++                // current character does not result in a word boundary.
++                let next_mode = if c.is_lowercase() {
++                    WordMode::Lowercase
++                } else if c.is_uppercase() {
++                    WordMode::Uppercase
++                } else {
++                    mode
++                };
++
++                // Word boundary after if next is underscore or current is
++                // not uppercase and next is uppercase
++                if next == '_' || (next_mode == WordMode::Lowercase && next.is_uppercase()) {
++                    if !first_word {
++                        boundary(&mut out);
++                    }
++                    with_word(&word[init..next_i], &mut out);
++                    first_word = false;
++                    init = next_i;
++                    mode = WordMode::Boundary;
++
++                // Otherwise if current and previous are uppercase and next
++                // is lowercase, word boundary before
++                } else if mode == WordMode::Uppercase && c.is_uppercase() && next.is_lowercase() {
++                    if !first_word {
++                        boundary(&mut out);
++                    } else {
++                        first_word = false;
++                    }
++                    with_word(&word[init..i], &mut out);
++                    init = i;
++                    mode = WordMode::Boundary;
++
++                // Otherwise no word boundary, just update the mode
++                } else {
++                    mode = next_mode;
++                }
++            } else {
++                // Collect trailing characters as a word
++                if !first_word {
++                    boundary(&mut out);
++                } else {
++                    first_word = false;
++                }
++                with_word(&word[init..], &mut out);
++                break;
++            }
++        }
++    }
++
++    out
++}
++
++fn lowercase(s: &str, out: &mut String) {
++    let mut chars = s.chars().peekable();
++    while let Some(c) = chars.next() {
++        if c == 'Σ' && chars.peek().is_none() {
++            out.push('ς');
++        } else {
++            out.extend(c.to_lowercase());
++        }
++    }
++}
++
++fn uppercase(s: &str, out: &mut String) {
++    for c in s.chars() {
++        out.extend(c.to_uppercase())
++    }
++}
++
++fn capitalize(s: &str, out: &mut String) {
++    let mut char_indices = s.char_indices();
++    if let Some((_, c)) = char_indices.next() {
++        out.extend(c.to_uppercase());
++        if let Some((i, _)) = char_indices.next() {
++            lowercase(&s[i..], out);
++        }
++    }
++}
+diff --git a/0.3.3/src/mixed.rs b/0.3.3/src/mixed.rs
+new file mode 100644
+index 0000000..71089f2
+--- /dev/null
++++ b/0.3.3/src/mixed.rs
+@@ -0,0 +1,61 @@
++use crate::{capitalize, lowercase, transform};
++
++/// This trait defines a mixed case conversion.
++///
++/// In mixedCase, word boundaries are indicated by capital letters, excepting
++/// the first word.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::MixedCase;
++///
++/// let sentence = "It is we who built these palaces and cities.";
++/// assert_eq!(sentence.to_mixed_case(), "itIsWeWhoBuiltThesePalacesAndCities");
++/// ```
++pub trait MixedCase: ToOwned {
++    /// Convert this type to mixed case.
++    fn to_mixed_case(&self) -> Self::Owned;
++}
++
++impl MixedCase for str {
++    fn to_mixed_case(&self) -> String {
++        transform(
++            self,
++            |s, out| {
++                if out.is_empty() {
++                    lowercase(s, out);
++                } else {
++                    capitalize(s, out)
++                }
++            },
++            |_| {},
++        )
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::MixedCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_mixed_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "camelCase");
++    t!(test2: "This is Human case." => "thisIsHumanCase");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixedUpCamelCaseWithSomeSpaces");
++    t!(test4: "mixed_up_ snake_case, with some _spaces" => "mixedUpSnakeCaseWithSomeSpaces");
++    t!(test5: "kebab-case" => "kebabCase");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "shoutySnakeCase");
++    t!(test7: "snake_case" => "snakeCase");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "thisContainsAllKindsOfWordBoundaries");
++    t!(test9: "XΣXΣ baffle" => "xσxςBaffle");
++    t!(test10: "XMLHttpRequest" => "xmlHttpRequest");
++    // TODO unicode tests
++}
+diff --git a/0.3.3/src/shouty_kebab.rs b/0.3.3/src/shouty_kebab.rs
+new file mode 100644
+index 0000000..0225471
+--- /dev/null
++++ b/0.3.3/src/shouty_kebab.rs
+@@ -0,0 +1,51 @@
++use crate::{transform, uppercase};
++
++/// This trait defines a shouty kebab case conversion.
++///
++/// In SHOUTY-KEBAB-CASE, word boundaries are indicated by hyphens and all
++/// words are in uppercase.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::ShoutyKebabCase;
++///
++/// let sentence = "We are going to inherit the earth.";
++/// assert_eq!(sentence.to_shouty_kebab_case(), "WE-ARE-GOING-TO-INHERIT-THE-EARTH");
++/// ```
++pub trait ShoutyKebabCase: ToOwned {
++    /// Convert this type to shouty kebab case.
++    fn to_shouty_kebab_case(&self) -> Self::Owned;
++}
++
++impl ShoutyKebabCase for str {
++    fn to_shouty_kebab_case(&self) -> Self::Owned {
++        transform(self, uppercase, |s| s.push('-'))
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::ShoutyKebabCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_shouty_kebab_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "CAMEL-CASE");
++    t!(test2: "This is Human case." => "THIS-IS-HUMAN-CASE");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "MIXED-UP-CAMEL-CASE-WITH-SOME-SPACES");
++    t!(test4: "mixed_up_ snake_case with some _spaces" => "MIXED-UP-SNAKE-CASE-WITH-SOME-SPACES");
++    t!(test5: "kebab-case" => "KEBAB-CASE");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "SHOUTY-SNAKE-CASE");
++    t!(test7: "snake_case" => "SNAKE-CASE");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "THIS-CONTAINS-ALL-KINDS-OF-WORD-BOUNDARIES");
++    t!(test9: "XΣXΣ baffle" => "XΣXΣ-BAFFLE");
++    t!(test10: "XMLHttpRequest" => "XML-HTTP-REQUEST");
++    t!(test11: "SHOUTY-KEBAB-CASE" => "SHOUTY-KEBAB-CASE");
++}
+diff --git a/0.3.3/src/shouty_snake.rs b/0.3.3/src/shouty_snake.rs
+new file mode 100644
+index 0000000..8f4289a
+--- /dev/null
++++ b/0.3.3/src/shouty_snake.rs
+@@ -0,0 +1,64 @@
++use crate::{transform, uppercase};
++
++/// This trait defines a shouty snake case conversion.
++///
++/// In SHOUTY_SNAKE_CASE, word boundaries are indicated by underscores and all
++/// words are in uppercase.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::ShoutySnakeCase;
++///     
++/// let sentence = "That world is growing in this minute.";
++/// assert_eq!(sentence.to_shouty_snake_case(), "THAT_WORLD_IS_GROWING_IN_THIS_MINUTE");
++/// ```
++pub trait ShoutySnakeCase: ToOwned {
++    /// Convert this type to shouty snake case.
++    fn to_shouty_snake_case(&self) -> Self::Owned;
++}
++
++/// Oh heck, ShoutySnekCase is an alias for ShoutySnakeCase. See ShoutySnakeCase
++/// for more documentation.
++pub trait ShoutySnekCase: ToOwned {
++    /// CONVERT THIS TYPE TO SNEK CASE.
++    #[allow(non_snake_case)]
++    fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned;
++}
++
++impl<T: ?Sized + ShoutySnakeCase> ShoutySnekCase for T {
++    fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned {
++        self.to_shouty_snake_case()
++    }
++}
++
++impl ShoutySnakeCase for str {
++    fn to_shouty_snake_case(&self) -> Self::Owned {
++        transform(self, uppercase, |s| s.push('_'))
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::ShoutySnakeCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_shouty_snake_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "CAMEL_CASE");
++    t!(test2: "This is Human case." => "THIS_IS_HUMAN_CASE");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "MIXED_UP_CAMEL_CASE_WITH_SOME_SPACES");
++    t!(test4: "mixed_up_snake_case with some _spaces" => "MIXED_UP_SNAKE_CASE_WITH_SOME_SPACES");
++    t!(test5: "kebab-case" => "KEBAB_CASE");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "SHOUTY_SNAKE_CASE");
++    t!(test7: "snake_case" => "SNAKE_CASE");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "THIS_CONTAINS_ALL_KINDS_OF_WORD_BOUNDARIES");
++    t!(test9: "XΣXΣ baffle" => "XΣXΣ_BAFFLE");
++    t!(test10: "XMLHttpRequest" => "XML_HTTP_REQUEST");
++}
+diff --git a/0.3.3/src/snake.rs b/0.3.3/src/snake.rs
+new file mode 100644
+index 0000000..c1ad376
+--- /dev/null
++++ b/0.3.3/src/snake.rs
+@@ -0,0 +1,77 @@
++use crate::{lowercase, transform};
++
++/// This trait defines a snake case conversion.
++///
++/// In snake_case, word boundaries are indicated by underscores.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::SnakeCase;
++///
++/// let sentence = "We carry a new world here, in our hearts.";
++/// assert_eq!(sentence.to_snake_case(), "we_carry_a_new_world_here_in_our_hearts");
++/// ```
++pub trait SnakeCase: ToOwned {
++    /// Convert this type to snake case.
++    fn to_snake_case(&self) -> Self::Owned;
++}
++
++/// Oh heck, SnekCase is an alias for SnakeCase. See SnakeCase for
++/// more documentation.
++pub trait SnekCase: ToOwned {
++    /// Convert this type to snek case.
++    fn to_snek_case(&self) -> Self::Owned;
++}
++
++impl<T: ?Sized + SnakeCase> SnekCase for T {
++    fn to_snek_case(&self) -> Self::Owned {
++        self.to_snake_case()
++    }
++}
++
++impl SnakeCase for str {
++    fn to_snake_case(&self) -> String {
++        transform(self, lowercase, |s| s.push('_'))
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::SnakeCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_snake_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "camel_case");
++    t!(test2: "This is Human case." => "this_is_human_case");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixed_up_camel_case_with_some_spaces");
++    t!(test4: "mixed_up_ snake_case with some _spaces" => "mixed_up_snake_case_with_some_spaces");
++    t!(test5: "kebab-case" => "kebab_case");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "shouty_snake_case");
++    t!(test7: "snake_case" => "snake_case");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "this_contains_all_kinds_of_word_boundaries");
++    t!(test9: "XΣXΣ baffle" => "xσxς_baffle");
++    t!(test10: "XMLHttpRequest" => "xml_http_request");
++    t!(test11: "FIELD_NAME11" => "field_name11");
++    t!(test12: "99BOTTLES" => "99bottles");
++    t!(test13: "FieldNamE11" => "field_nam_e11");
++
++    t!(test14: "abc123def456" => "abc123def456");
++    t!(test16: "abc123DEF456" => "abc123_def456");
++    t!(test17: "abc123Def456" => "abc123_def456");
++    t!(test18: "abc123DEf456" => "abc123_d_ef456");
++    t!(test19: "ABC123def456" => "abc123def456");
++    t!(test20: "ABC123DEF456" => "abc123def456");
++    t!(test21: "ABC123Def456" => "abc123_def456");
++    t!(test22: "ABC123DEf456" => "abc123d_ef456");
++    t!(test23: "ABC123dEEf456FOO" => "abc123d_e_ef456_foo");
++    t!(test24: "abcDEF" => "abc_def");
++    t!(test25: "ABcDE" => "a_bc_de");
++}
+diff --git a/0.3.3/src/title.rs b/0.3.3/src/title.rs
+new file mode 100644
+index 0000000..015a9fa
+--- /dev/null
++++ b/0.3.3/src/title.rs
+@@ -0,0 +1,50 @@
++use crate::{capitalize, transform};
++
++/// This trait defines a title case conversion.
++///
++/// In Title Case, word boundaries are indicated by spaces, and every word is
++/// capitalized.
++///
++/// ## Example:
++///
++/// ```rust
++/// use heck::TitleCase;
++///
++/// let sentence = "We have always lived in slums and holes in the wall.";
++/// assert_eq!(sentence.to_title_case(), "We Have Always Lived In Slums And Holes In The Wall");
++/// ```
++pub trait TitleCase: ToOwned {
++    /// Convert this type to title case.
++    fn to_title_case(&self) -> Self::Owned;
++}
++
++impl TitleCase for str {
++    fn to_title_case(&self) -> String {
++        transform(self, capitalize, |s| s.push(' '))
++    }
++}
++
++#[cfg(test)]
++mod tests {
++    use super::TitleCase;
++
++    macro_rules! t {
++        ($t:ident : $s1:expr => $s2:expr) => {
++            #[test]
++            fn $t() {
++                assert_eq!($s1.to_title_case(), $s2)
++            }
++        };
++    }
++
++    t!(test1: "CamelCase" => "Camel Case");
++    t!(test2: "This is Human case." => "This Is Human Case");
++    t!(test3: "MixedUP CamelCase, with some Spaces" => "Mixed Up Camel Case With Some Spaces");
++    t!(test4: "mixed_up_ snake_case, with some _spaces" => "Mixed Up Snake Case With Some Spaces");
++    t!(test5: "kebab-case" => "Kebab Case");
++    t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty Snake Case");
++    t!(test7: "snake_case" => "Snake Case");
++    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "This Contains All Kinds Of Word Boundaries");
++    t!(test9: "XΣXΣ baffle" => "Xσxς Baffle");
++    t!(test10: "XMLHttpRequest" => "Xml Http Request");
++}
diff --git a/src/lib.rs b/src/lib.rs
index 21a45f0..49bfb0e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,7 @@
 //! **heck** is a case conversion library.
 //!
 //! This library exists to provide case conversion between common cases like
-//! CamelCase and snake_case. It is intended to be unicode aware, internally,
+//! CamelCase and snake_case. It is intended to be unicode aware, internally
 //! consistent, and reasonably well performing.
 //!
 //! ## Definition of a word boundary
@@ -37,6 +37,7 @@
 //! 5. SHOUTY_SNAKE_CASE
 //! 6. Title Case
 //! 7. SHOUTY-KEBAB-CASE
+//! 8. Train-Case
 #![deny(missing_docs)]
 #![forbid(unsafe_code)]
 
@@ -46,6 +47,7 @@ mod shouty_kebab;
 mod shouty_snake;
 mod snake;
 mod title;
+mod train;
 mod upper_camel;
 
 pub use kebab::{AsKebabCase, ToKebabCase};
@@ -56,6 +58,7 @@ pub use shouty_snake::{
 };
 pub use snake::{AsSnakeCase, AsSnakeCase as AsSnekCase, ToSnakeCase, ToSnekCase};
 pub use title::{AsTitleCase, ToTitleCase};
+pub use train::{AsTrainCase, ToTrainCase};
 pub use upper_camel::{
     AsUpperCamelCase, AsUpperCamelCase as AsPascalCase, ToPascalCase, ToUpperCamelCase,
 };
diff --git a/src/train.rs b/src/train.rs
new file mode 100644
index 0000000..04dd6a9
--- /dev/null
+++ b/src/train.rs
@@ -0,0 +1,85 @@
+use std::fmt;
+
+use crate::{capitalize, transform};
+
+/// This trait defines a train case conversion.
+///
+/// In Train-Case, word boundaries are indicated by hyphens and words start
+/// with Capital Letters.
+///
+/// ## Example:
+///
+/// ```rust
+/// use heck::ToTrainCase;
+///
+/// let sentence = "We are going to inherit the earth.";
+/// assert_eq!(sentence.to_train_case(), "We-Are-Going-To-Inherit-The-Earth");
+/// ```
+pub trait ToTrainCase: ToOwned {
+    /// Convert this type to Train-Case.
+    fn to_train_case(&self) -> Self::Owned;
+}
+
+impl ToTrainCase for str {
+    fn to_train_case(&self) -> Self::Owned {
+        AsTrainCase(self).to_string()
+    }
+}
+
+/// This wrapper performs a train case conversion in [`fmt::Display`].
+///
+/// ## Example:
+///
+/// ```
+/// use heck::AsTrainCase;
+///
+/// let sentence = "We are going to inherit the earth.";
+/// assert_eq!(format!("{}", AsTrainCase(sentence)), "We-Are-Going-To-Inherit-The-Earth");
+/// ```
+pub struct AsTrainCase<T: AsRef<str>>(pub T);
+
+impl<T: AsRef<str>> fmt::Display for AsTrainCase<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        transform(self.0.as_ref(), capitalize, |f| write!(f, "-"), f)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::ToTrainCase;
+
+    macro_rules! t {
+        ($t:ident : $s1:expr => $s2:expr) => {
+            #[test]
+            fn $t() {
+                assert_eq!($s1.to_train_case(), $s2)
+            }
+        };
+    }
+
+    t!(test1: "CamelCase" => "Camel-Case");
+    t!(test2: "This is Human case." => "This-Is-Human-Case");
+    t!(test3: "MixedUP CamelCase, with some Spaces" => "Mixed-Up-Camel-Case-With-Some-Spaces");
+    t!(test4: "mixed_up_ snake_case with some _spaces" => "Mixed-Up-Snake-Case-With-Some-Spaces");
+    t!(test5: "kebab-case" => "Kebab-Case");
+    t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty-Snake-Case");
+    t!(test7: "snake_case" => "Snake-Case");
+    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "This-Contains-All-Kinds-Of-Word-Boundaries");
+    #[cfg(feature = "unicode")]
+    t!(test9: "XΣXΣ baffle" => "Xσxς-Baffle");
+    t!(test10: "XMLHttpRequest" => "Xml-Http-Request");
+    t!(test11: "FIELD_NAME11" => "Field-Name11");
+    t!(test12: "99BOTTLES" => "99bottles");
+    t!(test13: "FieldNamE11" => "Field-Nam-E11");
+    t!(test14: "abc123def456" => "Abc123def456");
+    t!(test16: "abc123DEF456" => "Abc123-Def456");
+    t!(test17: "abc123Def456" => "Abc123-Def456");
+    t!(test18: "abc123DEf456" => "Abc123-D-Ef456");
+    t!(test19: "ABC123def456" => "Abc123def456");
+    t!(test20: "ABC123DEF456" => "Abc123def456");
+    t!(test21: "ABC123Def456" => "Abc123-Def456");
+    t!(test22: "ABC123DEf456" => "Abc123d-Ef456");
+    t!(test23: "ABC123dEEf456FOO" => "Abc123d-E-Ef456-Foo");
+    t!(test24: "abcDEF" => "Abc-Def");
+    t!(test25: "ABcDE" => "A-Bc-De");
+}