commit db3fc2fcff319f1016e777a50d466240cb012aec
Author: Greg <gregory.mkv@gmail.com>
Date:   Sun Dec 23 00:01:35 2018 -0500

    start

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..eda166d
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,212 @@
+[[package]]
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+dependencies = [
+ "memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9a8c9d4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "re"
+version = "0.1.0"
+edition = "2018"
+authors = ["Gregory <gregory.mkv@gmail.com>"]
+description = "A find & replace CLI focused on user-friendliness"
+keywords = ["sed", "find", "replace", "regex"]
+license = "MIT"
+homepage = "https://github.com/chmln/re"
+repository = "https://github.com/chmln/re.git"
+categories = ["command-line-utilities", "text-processing", "development-tools"]
+
+[dependencies]
+clap = "2.32.0"
+regex = "1.1.0"
+
+[profile.release]
+opt-level = 3
+lto = true
+debug = false
diff --git a/src/app.rs b/src/app.rs
new file mode 100644
index 0000000..80d6231
--- /dev/null
+++ b/src/app.rs
@@ -0,0 +1,56 @@
+use {crate::{Error,Stream,Source}};
+
+const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
+pub(crate) struct App;
+
+impl App {
+    pub(crate) fn run() -> Result<(), Error> {
+        use clap;
+        let app = clap::App::new("re")
+            .version(VERSION)
+            .setting(clap::AppSettings::ColoredHelp)
+            .setting(clap::AppSettings::NextLineHelp)
+            .arg(
+                clap::Arg::with_name("enable_regex")
+                    .short("r")
+                    .long("regex")
+                    .required(false)
+                    .takes_value(false)
+                    .help("Enable regex"),
+            )
+            .arg(
+                clap::Arg::with_name("input")
+                    .short("i")
+                    .required(false)
+                    .takes_value(true)
+                    .help("The path to file")
+            )
+            .arg(
+                clap::Arg::with_name("find")
+                    .help("The string or regexp (if --regex) to search for.")
+                    .required(true)
+                    .index(1),
+            )
+            .arg(
+                clap::Arg::with_name("replace_with")
+                    .help("What to replace each match with. If regex is enabled, you may use captured values like $1, $2, etc.")
+                    .required(true)
+                    .index(2),
+            );
+
+        let matches = app.get_matches();
+
+        let file_path = matches.value_of("input").map(|p| p.to_string());
+        let find = matches.value_of("find").unwrap();
+        let replace_with = matches.value_of("replace_with").unwrap();
+        let is_regex = matches.occurrences_of("enable_regex") == 1;
+
+        let source = Source::from(file_path);
+        let mut stream: Stream = (&source).into_stream()?;
+        stream.replace(is_regex, find, replace_with)?;
+
+        // replace file in-place, or pipe to stdout
+        stream.output(&source)
+    }
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..8d919c9
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,32 @@
+pub(crate) struct Error {
+    // low-level cause, used only for debugging
+    cause: String,
+    // user-facing error output
+    description: String,
+}
+
+impl<T> From<T> for Error
+where
+    T: std::error::Error,
+{
+    fn from(err: T) -> Error {
+        Error {
+            cause: err
+                .source()
+                .map_or_else(|| "N/A".to_string(), |e| e.to_string()),
+            description: format!("{}", err),
+        }
+    }
+}
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{}", self.description)
+    }
+}
+
+impl std::fmt::Debug for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "Error: {}\nDetails: {}", self.description, self.cause)
+    }
+}
diff --git a/src/input.rs b/src/input.rs
new file mode 100644
index 0000000..7c283a5
--- /dev/null
+++ b/src/input.rs
@@ -0,0 +1,78 @@
+use {crate::Error, std::{fs::File, io::prelude::*}};
+
+pub(crate) enum Source {
+    Stdin,
+    File(String),
+}
+
+impl Source {
+    pub(crate) fn from(maybe_path: Option<String>) -> Self {
+        maybe_path
+            .map(Source::File)
+            .unwrap_or_else(|| Source::Stdin)
+    }
+
+    pub(crate) fn into_stream(&self) -> Result<Stream, Error> {
+        match self {
+            Source::Stdin => {
+                let mut buffer = String::new();
+                let stdin = std::io::stdin();
+                let mut handle = stdin.lock();
+
+                handle.read_to_string(&mut buffer)?;
+                Ok(Stream::new(buffer))
+            }
+            Source::File(path) => {
+                let file = File::open(path)?;
+                let mut buf_reader = std::io::BufReader::new(file);
+                let mut buffer = String::new();
+                buf_reader.read_to_string(&mut buffer)?;
+                Ok(Stream::new(buffer))
+            }
+        }
+    }
+
+}
+
+pub(crate) struct Stream {
+    data: String,
+}
+
+impl Stream {
+    pub(crate) fn new(data: String) -> Self {
+        Self { data }
+    }
+
+    pub(crate) fn replace(
+        &mut self,
+        is_regex: bool,
+        look_for: &str,
+        replace_with: &str,
+    ) -> Result<(), crate::Error> {
+        if is_regex {
+            self.data = regex::Regex::new(look_for)?
+                .replace_all(&self.data, replace_with)
+                .to_string()
+        } else {
+            self.data = self.data.replace(look_for, replace_with)
+        }
+        Ok(())
+    }
+
+    // Output based on input.
+    // When dealing with a file, transform it in-place.
+    // Otherwise, pipe to stdout.
+    pub(crate) fn output(self, source: &Source) -> Result<(), crate::Error> {
+        match source {
+            Source::File(path) => {
+                Ok(std::fs::write(path, self.data)?)
+            },
+            Source::Stdin => {
+                let stdout = std::io::stdout();
+                let mut handle = stdout.lock();
+                handle.write(self.data.as_bytes())?;
+                Ok(())
+            }
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e861bbc
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,12 @@
+mod app;
+mod error;
+mod input;
+
+pub(crate) use {
+    crate::error::Error,
+    crate::input::{Source, Stream},
+};
+
+fn main() -> Result<(), ()> {
+    app::App::run().map_err(|e| eprintln!("{}", e))
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1 @@
+