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diff --git a/vendor/comma/.cargo-checksum.json b/vendor/comma/.cargo-checksum.json
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@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"1948b6f99c75b25f6b70dab12155ba2854cdcebd18d823a3b84f3ea7a57e382c","README.md":"04da7267815159c07eae7f9802697cde66c49c8f2cca190c7f657841eb1dc0a8","src/lib.rs":"4beb857981727fbdd3142301bb2f945e88437320296da6d39b266aeaddbfdb22"},"package":"55b672471b4e9f9e95499ea597ff64941a309b2cdbffcc46f2cc5e2d971fd335"}
+\ No newline at end of file
diff --git a/vendor/comma/Cargo.toml b/vendor/comma/Cargo.toml
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+# 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 = "comma"
+version = "1.0.0"
+authors = ["Ethan McTague <ethan@tague.me>"]
+exclude = ["target", ".idea/*", ".gitignore"]
+description = "Shell-style command parser with support for escaping and quotations."
+readme = "README.md"
+keywords = ["string", "parse", "parsing", "command", "shell"]
+categories = ["command-line-interface", "parsing", "parser-implementations"]
+license = "MIT"
+repository = "https://github.com/emctague/comma"
+
+[dependencies]
diff --git a/vendor/comma/README.md b/vendor/comma/README.md
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+# comma
+
+[![Crates.io](https://img.shields.io/crates/v/comma?style=flat-square)](https://crates.io/crates/comma)
+[![docs.rs](https://docs.rs/comma/badge.svg)](https://docs.rs/comma)
+[![Build Status](https://travis-ci.org/emctague/comma.svg?branch=master)](https://travis-ci.org/emctague/comma)
+
+`comma` splits shell-style commands, e.g. `sendmsg joe "I say \"hi\" to you!"`, into a list of individual tokens.
+It correctly handles unicode characters, escape sequences, and single- or double-quoted strings.
+
+## Cargo
+
+```toml
+[dependencies]
+comma = "1.0.0"
+```
+
+## Usage
+
+```rust
+use comma::parse_command;
+
+fn main () {
+    let parsed = parse_command("sendmsg joe \"I say \\\"hi\\\" to you!\" 'but only\\ntoday'").unwrap();
+    println!("Result: {:#?}", parsed); // Result: [ "sendmsg", "joe", "I say \"hi\" to you!", "but only\ntoday" ]
+}
+```
+\ No newline at end of file
diff --git a/vendor/comma/src/lib.rs b/vendor/comma/src/lib.rs
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+//! `comma` parses command-line-style strings. See [`parse_command`] for details.
+
+use std::iter::{Peekable};
+use std::str::{Chars};
+
+fn parse_escape(chars: &mut Peekable<Chars>) -> Option<char> {
+    return Some(match chars.next()? {
+        'n' => '\n',
+        'r' => '\r',
+        't' => '\t',
+        literal => literal
+    })
+}
+
+fn parse_string(chars: &mut Peekable<Chars>, delim: char) -> Option<String> {
+    let mut output = String::new();
+
+    while let Some(ch) = chars.next() {
+        if ch == delim {
+            return Some(output)
+        } else if ch == '\\' {
+            output.push(parse_escape(chars)?);
+        } else {
+            output.push(ch);
+        }
+    }
+
+    return None
+}
+
+/// Parses a command into a list of individual tokens.
+/// Each token is separated by one or more characters of whitespace.
+/// Pairs of single- or double-quotes can be used to ignore whitespace. Within pairs of quotation
+/// marks, a backslash (\) can be used to escape any character. The special escape sequences
+/// '\n', '\r', and '\t' are also handled as Newlines, Carriage Returns, and Tabs, respectively.
+/// Should a quotation mark be mismatched (no counterpart terminating mark exists), this function
+/// will return None. Otherwise, it returns a list of tokens in the input string.
+pub fn parse_command(input: &str) -> Option<Vec<String>> {
+    let mut next_push = true;
+    let mut chars = input.chars().peekable();
+    let mut output : Vec<String> = Vec::new();
+
+    while let Some(ch) = chars.next() {
+        if ch.is_whitespace() {
+            next_push = true;
+        } else{
+            if next_push { output.push(String::new()); next_push = false; }
+
+            if ch == '\\' {
+                output.last_mut()?.push(parse_escape(&mut chars)?);
+            } else if ch == '"' || ch == '\'' {
+                output.last_mut()?.push_str(parse_string(&mut chars, ch)?.as_str());
+            } else {
+                output.last_mut()?.push(ch);
+            }
+        }
+    }
+
+    return Some(output)
+}
+
+
+#[cfg(test)]
+mod tests {
+    use crate::{parse_command};
+
+    #[test]
+    fn parsing_works() {
+        let result = parse_command("hello world \\'this is\\' a \"quoted \\\"string\\\"\"").unwrap();
+        assert_eq!(result,
+                   vec![String::from("hello"), String::from("world"),
+                        String::from("'this"), String::from("is'"), String::from("a"),
+                        String::from("quoted \"string\"")]);
+    }
+
+    #[test]
+    fn fail_mismatch() {
+        assert_eq!(parse_command("Hello 'world "), None);
+    }
+
+    #[test]
+    fn unicode() {
+        // This contains a CJK IDEOGRAPH EXTENSION G character, which is invisible.
+        let result = parse_command("ß 𱁬").unwrap();
+        assert_eq!(
+            result,
+            vec![String::from("ß"), String::from("𱁬")]
+        );
+    }
+}