doc: overhaul documentation

This commit cleans up the README and splits portions of it out into
a user guide (GUIDE.md) and a FAQ (FAQ.md). The README now provides a
small list of documentation "quick" links to various parts of the docs.

This commit also does a few other minor touchups.

1 files changed, 676 insertions, 0 deletions

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+## User Guide
+
+This guide is intended to give an elementary description of ripgrep and an
+overview of its capabilities. This guide assumes that ripgrep is
+[installed](README.md#installation)
+and that readers have passing familiarity with using command line tools. This
+also assumes a Unix-like system, although most commands are probably easily
+translatable to any command line shell environment.
+
+
+### Table of Contents
+
+* [Basics](#basics)
+* [Recursive search](#recursive-search)
+* [Automatic filtering](#automatic-filtering)
+* [Manual filtering: globs](#manual-filtering-globs)
+* [Manual filtering: file types](#manual-filtering-file-types)
+* [Replacements](#replacements)
+* [Configuration file](#configuration-file)
+* [File encoding](#file-encoding)
+* [Common options](#common-options)
+
+
+### Basics
+
+ripgrep is a command line tool that searches your files for patterns that
+you give it. ripgrep behaves as if reading each file line by line. If a line
+matches the pattern provided to ripgrep, then that line will be printed. If a
+line does not match the pattern, then the line is not printed.
+
+The best way to see how this works is with an example. To show an example, we
+need something to search. Let's try searching ripgrep's source code. First
+grab a ripgrep source archive from
+https://github.com/BurntSushi/ripgrep/archive/0.7.1.zip
+and extract it:
+
+```
+$ curl -LO https://github.com/BurntSushi/ripgrep/archive/0.7.1.zip
+$ unzip 0.7.1.zip
+$ cd ripgrep-0.7.1
+$ ls
+benchsuite  grep       tests         Cargo.toml       LICENSE-MIT
+ci          ignore     wincolor      CHANGELOG.md     README.md
+complete    pkg        appveyor.yml  compile          snapcraft.yaml
+doc         src        build.rs      COPYING          UNLICENSE
+globset     termcolor  Cargo.lock    HomebrewFormula
+```
+
+Let's try our first search by looking for all occurrences of the word `fast`
+in `README.md`:
+
+```
+$ rg fast README.md
+75:  faster than both. (N.B. It is not, strictly speaking, a "drop-in" replacement
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays fast while
+119:### Is it really faster than everything else?
+124:Summarizing, `ripgrep` is fast because:
+129:  optimizations to make searching very fast.
+```
+
+So what happened here? ripgrep read the contents of `README.md`, and for each
+line that contained `fast`, ripgrep printed it to your terminal. ripgrep also
+included the line number for each line by default. If your terminal supports
+colors, then your output might actually look something like this screenshot:
+
+[![A screenshot of a sample search ripgrep](https://burntsushi.net/stuff/ripgrep-guide-sample.png)](https://burntsushi.net/stuff/ripgrep-guide-sample.png)
+
+In this example, we searched for something called a "literal" string. This
+means that our pattern was just some normal text that we asked ripgrep to
+find. But ripgrep supports the ability to specify patterns via [regular
+expressions](https://en.wikipedia.org/wiki/Regular_expression). As an example,
+what if we wanted to find all lines have a word that contains `fast` followed
+by some number of other letters?
+
+```
+$ rg 'fast\w+' README.md
+75:  faster than both. (N.B. It is not, strictly speaking, a "drop-in" replacement
+119:### Is it really faster than everything else?
+```
+
+In this example, we used the pattern `fast\w+`. This pattern tells ripgrep to
+look for any lines containing the letters `fast` followed by *one or more*
+word-like characters. Namely, `\w` matches characters that compose words (like
+`a` and `L` but unlike `.` and ` `). The `+` after the `\w` means, "match the
+previous pattern one or more times." This means that the word `fast` won't
+match because there are no word characters following the final `t`. But a word
+like `faster` will. `faste` would also match!
+
+Here's a different variation on this same theme:
+
+```
+$ rg 'fast\w*' README.md
+75:  faster than both. (N.B. It is not, strictly speaking, a "drop-in" replacement
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays fast while
+119:### Is it really faster than everything else?
+124:Summarizing, `ripgrep` is fast because:
+129:  optimizations to make searching very fast.
+```
+
+In this case, we used `fast\w*` for our pattern instead of `fast\w+`. The `*`
+means that it should match *zero* or more times. In this case, ripgrep will
+print the same lines as the pattern `fast`, but if your terminal supports
+colors, you'll notice that `faster` will be highlighted instead of just the
+`fast` prefix.
+
+It is beyond the scope of this guide to provide a full tutorial on regular
+expressions, but ripgrep's specific syntax is documented here:
+https://docs.rs/regex/0.2.5/regex/#syntax
+
+
+### Recursive search
+
+In the previous section, we showed how to use ripgrep to search a single file.
+In this section, we'll show how to use ripgrep to search an entire directory
+of files. In fact, *recursively* searching your current working directory is
+the default mode of operation for ripgrep, which means doing this is very
+simple.
+
+Using our unzipped archive of ripgrep source code, here's how to find all
+function definitions whose name is `write`:
+
+```
+$ rg 'fn write\('
+src/printer.rs
+469:    fn write(&mut self, buf: &[u8]) {
+
+termcolor/src/lib.rs
+227:    fn write(&mut self, b: &[u8]) -> io::Result<usize> {
+250:    fn write(&mut self, b: &[u8]) -> io::Result<usize> {
+428:    fn write(&mut self, b: &[u8]) -> io::Result<usize> { self.wtr.write(b) }
+441:    fn write(&mut self, b: &[u8]) -> io::Result<usize> { self.wtr.write(b) }
+454:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+511:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+848:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+915:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+949:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+1114:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+1348:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+1353:    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+```
+
+(**Note:** We escape the `(` here because `(` has special significance inside
+regular expressions. You could also use `rg -F 'fn write('` to achieve the
+same thing, where `-F` interprets your pattern as a literal string instead of
+a regular expression.)
+
+In this example, we didn't specify a file at all. Instead, ripgrep defaulted
+to searching your current directory in the absence of a path. In general,
+`rg foo` is equivalent to `rg foo ./`.
+
+This particular search showed us results in both the `src` and `termcolor`
+directories. The `src` directory is the core ripgrep code where as `termcolor`
+is a dependency of ripgrep (and is used by other tools). What if we only wanted
+to search core ripgrep code? Well, that's easy, just specify the directory you
+want:
+
+```
+$ rg 'fn write\(' src
+src/printer.rs
+469:    fn write(&mut self, buf: &[u8]) {
+```
+
+Here, ripgrep limited its search to the `src` directory. Another way of doing
+this search would be to `cd` into the `src` directory and simply use `rg 'fn
+write\('` again.
+
+
+### Automatic filtering
+
+After recursive search, ripgrep's most important feature is what it *doesn't*
+search. By default, when you search a directory, ripgrep will ignore all of
+the following:
+
+1. Files and directories that match the rules in your `.gitignore` glob
+   pattern.
+2. Hidden files and directories.
+3. Binary files. (ripgrep considers any file with a `NUL` byte to be binary.)
+4. Symbolic links aren't followed.
+
+All of these things can be toggled using various flags provided by ripgrep:
+
+1. You can disable `.gitignore` handling with the `--no-ignore` flag.
+2. Hidden files and directories can be searched with the `--hidden` flag.
+3. Binary files can be searched via the `--text` (`-a` for short) flag.
+   Be careful with this flag! Binary files may emit control characters to your
+   terminal, which might cause strange behavior.
+4. ripgrep can follow symlinks with the `--follow` (`-L` for short) flag.
+
+As a special convenience, ripgrep also provides a flag called `--unrestricted`
+(`-u` for short). Repeated uses of this flag will cause ripgrep to disable
+more and more of its filtering. That is, `-u` will disable `.gitignore`
+handling, `-uu` will search hidden files and directories and `-uuu` will search
+binary files. This is useful when you're using ripgrep and you aren't sure
+whether its filtering is hiding results from you. Tacking on a couple `-u`
+flags is a quick way to find out. (Use the `--debug` flag if you're still
+perplexed, and if that doesn't help,
+[file an issue](https://github.com/BurntSushi/ripgrep/issues/new).)
+
+ripgrep's `.gitignore` handling actually goes a bit beyond just `.gitignore`
+files. ripgrep will also respect repository specific rules found in
+`$GIT_DIR/info/exclude`, as well as any global ignore rules in your
+`core.excludesFile` (which is usually `$XDG_CONFIG_HOME/git/ignore` on
+Unix-like systems).
+
+Sometimes you want to search files that are in your `.gitignore`, so it is
+possible to specify additional ignore rules or overrides in a `.ignore`
+(application agnostic) or `.rgignore` (ripgrep specific) file.
+
+For example, let's say you have a `.gitignore` file that looks like this:
+
+```
+log/
+```
+
+This generally means that any `log` directory won't be tracked by `git`.
+However, perhaps it contains useful output that you'd like to include in your
+searches, but you still don't want to track it in `git`. You can achieve this
+by creating a `.ignore` file in the same directory as the `.gitignore` file
+with the following contents:
+
+```
+!log/
+```
+
+ripgrep treats `.ignore` files with higher precedence than `.gitignore` files
+(and treats `.rgignore` files with higher precdence than `.ignore` files).
+This means ripgrep will see the `!log/` whitelist rule first and search that
+directory.
+
+Like `.gitignore`, a `.ignore` file can be placed in any directory. Its rules
+will be processed with respect to the directory it resides in, just like
+`.gitignore`.
+
+For a more in depth description of how glob patterns in a `.gitignore` file
+are interpreted, please see `man gitignore`.
+
+
+### Manual filtering: globs
+
+In the previous section, we talked about ripgrep's filtering that it does by
+default. It is "automatic" because it reacts to your environment. That is, it
+uses already existing `.gitignore` files to produce more relevant search
+results.
+
+In addition to automatic filtering, ripgrep also provides more manual or ad hoc
+filtering. This comes in two varieties: additional glob patterns specified in
+your ripgrep commands and file type filtering. This section covers glob
+patterns while the next section covers file type filtering.
+
+In our ripgrep source code (see [Basics](#basics) for instructions on how to
+get a source archive to search), let's say we wanted to see which things depend
+on `clap`, our argument parser.
+
+We could do this:
+
+```
+$ rg clap
+[lots of results]
+```
+
+But this shows us many things, and we're only interested in where we wrote
+`clap` as a dependency. Instead, we could limit ourselves to TOML files, which
+is how dependencies are communicated to Rust's build tool, Cargo:
+
+```
+$ rg clap -g '*.toml'
+Cargo.toml
+35:clap = "2.26"
+51:clap = "2.26"
+```
+
+The `-g '*.toml'` syntax says, "make sure every file searched matches this
+glob pattern." Note that we put `'*.toml'` in single quotes to prevent our
+shell from expanding the `*`.
+
+If we wanted, we could tell ripgrep to search anything *but* `*.toml` files:
+
+```
+$ rg clap -g '!*.toml'
+[lots of results]
+```
+
+This will give you a lot of results again as above, but they won't include
+files ending with `.toml`. Note that the use of a `!` here to mean "negation"
+is a bit non-standard, but it was chosen to be consistent with how globs in
+`.gitignore` files are written. (Although, the meaning is reversed. In
+`.gitignore` files, a `!` prefix means whitelist, and on the command line, a
+`!` means blacklist.)
+
+Globs are interpreted in exactly the same way as `.gitignore` patterns. That
+is, later globs will override earlier globs. For example, the following command
+will search only `*.toml` files:
+
+```
+$ rg clap -g '!*.toml' -g '*.toml'
+```
+
+Interestingly, reversing the order of the globs in this case will match
+nothing, since the presence of at least one non-blacklist glob will institute a
+requirement that every file searched must match at least one glob. In this
+case, the blacklist glob takes precedence over the previous glob and prevents
+any file from being searched at all!
+
+
+### Manual filtering: file types
+
+Over time, you might notice that you use the same glob patterns over and over.
+For example, you might find yourself doing a lot of searches where you only
+want to see results for Rust files:
+
+```
+$ rg 'fn run' -g '*.rs'
+```
+
+Instead of writing out the glob every time, you can use ripgrep's support for
+file types:
+
+```
+$ rg 'fn run' --type rust
+```
+
+or, more succinctly,
+
+```
+$ rg 'fn run' -trust
+```
+
+The way the `--type` flag functions is simple. It acts as a name that is
+assigned to one or more globs that match the relevant files. This lets you
+write a single type that might encompass a broad range of file extensions. For
+example, if you wanted to search C files, you'd have to check both C source
+files and C header files:
+
+```
+$ rg 'int main' -g '*.{c,h}'
+```
+
+or you could just use the C file type:
+
+```
+$ rg 'int main' -tc
+```
+
+Just as you can write blacklist globs, you can blacklist file types too:
+
+```
+$ rg clap --type-not rust
+```
+
+or, more succinctly,
+
+```
+$ rg clap -Trust
+```
+
+That is, `-t` means "include files of this type" where as `-T` means "exclude
+files of this type."
+
+To see the globs that make up a type, run `rg --type-list`:
+
+```
+$ rg --type-list | rg '^make:'
+make: *.mak, *.mk, GNUmakefile, Gnumakefile, Makefile, gnumakefile, makefile
+```
+
+By default, ripgrep comes with a bunch of pre-defined types. Generally, these
+types correspond to well known public formats. But you can define your own
+types as well. For example, perhaps you frequently search "web" files, which
+consist of Javascript, HTML and CSS:
+
+```
+$ rg --type-add 'web:*.html' --type-add 'web:*.css' --type-add 'web:*.js' -tweb title
+```
+
+or, more succinctly,
+
+```
+$ rg --type-add 'web:*.{html,css,js}' -tweb title
+```
+
+The above command defines a new type, `web`, corresponding to the glob
+`*.{html,css,js}`. It then applies the new filter with `-tweb` and searches for
+the pattern `title`. If you ran
+
+```
+$ rg --type-add 'web:*.{html,css,js}' --type-list
+```
+
+Then you would see your `web` type show up in the list, even though it is not
+part of ripgrep's built-in types.
+
+It is important to stress here that the `--type-add` flag only applies to the
+current command. It does not add a new file type and save it somewhere in a
+persistent form. If you want a type to be available in every ripgrep command,
+then you should either create a shell alias:
+
+```
+alias rg="rg --type-add 'web:*.{html,css,js}'"
+```
+
+or add `--type-add=web:*.{html,css,js}` to your ripgrep configuration file.
+([Configuration files](#configuration-file) are covered in more detail later.)
+
+
+### Replacements
+
+ripgrep provides a limited ability to modify its output by replacing matched
+text with some other text. This is easiest to explain with an example. Remember
+when we searched for the word `fast` in ripgrep's README?
+
+```
+$ rg fast README.md
+75:  faster than both. (N.B. It is not, strictly speaking, a "drop-in" replacement
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays fast while
+119:### Is it really faster than everything else?
+124:Summarizing, `ripgrep` is fast because:
+129:  optimizations to make searching very fast.
+```
+
+What if we wanted to *replace* all occurrences of `fast` with `FAST`? That's
+easy with ripgrep's `--replace` flag:
+
+```
+$ rg fast README.md --replace FAST
+75:  FASTer than both. (N.B. It is not, strictly speaking, a "drop-in" replacement
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays FAST while
+119:### Is it really FASTer than everything else?
+124:Summarizing, `ripgrep` is FAST because:
+129:  optimizations to make searching very FAST.
+```
+
+or, more succinctly,
+
+```
+$ rg fast README.md -r FAST
+[snip]
+```
+
+In essence, the `--replace` flag applies *only* to the matching portion of text
+in the output. If you instead wanted to replace an entire line of text, then
+you need to include the entire line in your match. For example:
+
+```
+$ rg '^.*fast.*$' README.md -r FAST
+75:FAST
+88:FAST
+119:FAST
+124:FAST
+129:FAST
+```
+
+Alternatively, you can combine the `--only-matching` (or `-o` for short) with
+the `--replace` flag to achieve the same result:
+
+```
+$ rg fast README.md --only-matching --replace FAST
+75:FAST
+88:FAST
+119:FAST
+124:FAST
+129:FAST
+```
+
+or, more succinctly,
+
+```
+$ rg fast README.md -or FAST
+[snip]
+```
+
+Finally, replacements can include capturing groups. For example, let's say
+we wanted to find all occurrences of `fast` followed by another word and
+join them together with a dash. The pattern we might use for that is
+`fast\s+(\w+)`, which matches `fast`, followed by any amount of whitespace,
+followed by any number of "word" characters. We put the `\w+` in a "capturing
+group" (indicated by parentheses) so that we can reference it later in our
+replacement string. For example:
+
+```
+$ rg 'fast\s+(\w+)' README.md -r 'fast-$1'
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays fast-while
+124:Summarizing, `ripgrep` is fast-because:
+```
+
+Our replacement string here, `fast-$1`, consists of `fast-` followed by the
+contents of the capturing group at index `1`. (Capturing groups actually start
+at index 0, but the `0`th capturing group always corresponds to the entire
+match. The capturing group at index `1` always corresponds to the first
+explicit capturing group found in the regex pattern.)
+
+Capturing groups can also be named, which is sometimes more convenient than
+using the indices. For example, the following command is equivalent to the
+above command:
+
+```
+$ rg 'fast\s+(?P<word>\w+)' README.md -r 'fast-$word'
+88:  color and full Unicode support. Unlike GNU grep, `ripgrep` stays fast-while
+124:Summarizing, `ripgrep` is fast-because:
+```
+
+It is important to note that ripgrep **will never modify your files**. The
+`--replace` flag only controls ripgrep's output. (And there is no flag to let
+you do a replacement in a file.)
+
+
+### Configuration file
+
+It is possible that ripgrep's default options aren't suitable in every case.
+For that reason, and because shell aliases aren't always convenient, ripgrep
+supports configuration files.
+
+Setting up a configuration file is simple. ripgrep will not look in any
+predetermined directory for a config file automatically. Instead, you need to
+set the `RIPGREP_CONFIG_PATH` environment variable to the file path of your
+config file. Once the environment variable is set, open the file and just type
+in the flags you want set automatically. There are only two rules for
+describing the format of the config file:
+
+1. Every line is a shell argument, after trimming ASCII whitespace.
+2. Lines starting with `#` (optionally preceded by any amount of
+   ASCII whitespace) are ignored.
+
+In particular, there is no escaping. Each line is given to ripgrep as a single
+command line argument verbatim.
+
+Here's an example of a configuration file, which demonstrates some of the
+formatting peculiarities:
+
+```
+$ cat $HOME/.ripgreprc
+# Don't let ripgrep vomit really long lines to my terminal.
+--max-columns=150
+
+# Add my 'web' type.
+--type-add
+web:*.{html,css,js}*
+
+# Set the colors.
+--colors=line:none
+--colors=line:style:bold
+
+# Because who cares about case!?
+--smart-case
+```
+
+When we use a flag that has a value, we either put the flag and the value on
+the same line but delimited by an `=` sign (e.g., `--max-columns=150`), or we
+put the flag and the value on two different lines. This is because ripgrep's
+argument parser knows to treat the single argument `--max-columns=150` as a
+flag with a value, but if we had written `--max-columns 150` in our
+configuration file, then ripgrep's argument parser wouldn't know what to do
+with it.
+
+Putting the flag and value on different lines is exactly equivalent and is a
+matter of style.
+
+Comments are encouraged so that you remember what the config is doing. Empty
+lines are OK too.
+
+So let's say you're using the above configuration file, but while you're at a
+terminal, you really want to be able to see lines longer than 150 columns. What
+do you do? Thankfully, all you need to do is pass `--max-columns 0` (or `-M0`
+for short) on the command line, which will override your configuration file's
+setting. This works because ripgrep's configuration file is *prepended* to the
+explicit arguments you give it on the command line. Since flags given later
+override flags given earlier, everything works as expected. This works for most
+other flags as well, and each flag's documentation states which other flags
+override it.
+
+If you're confused about what configuration file ripgrep is reading arguments
+from, then running ripgrep with the `--debug` flag should help clarify things.
+The debug output should note what config file is being loaded and the arugments
+that have been read from the configuration.
+
+Finally, if you want to make absolutely sure that ripgrep *isn't* reading a
+configuration file, then you can pass the `--no-config` flag, which will always
+prevent ripgrep from reading extraneous configuration from the environment,
+regardless of what other methods of configuration are added to ripgrep in the
+future.
+
+
+### File encoding
+
+[Text encoding](https://en.wikipedia.org/wiki/Character_encoding) is a complex
+topic, but we can try to summarize its relevancy to ripgrep:
+
+* Files are generally just a bundle of bytes. There is no reliable way to know
+  their encoding.
+* Either the encoding of the pattern must match the encoding of the files being
+  searched, or a form of transcoding must be performed converts either the
+  pattern or the file to the same encoding as the other.
+* ripgrep tends to work best on plain text files, and among plain text files,
+  the most popular encodings likely consist of ASCII, latin1 or UTF-8. As
+  a special exception, UTF-16 is prevalent in Windows environments
+
+In light of the above, here is how ripgrep behaves:
+
+* All input is assumed to be ASCII compatible (which means every byte that
+  corresponds to an ASCII codepoint actually is an ASCII codepoint). This
+  includes ASCII itself, latin1 and UTF-8.
+* ripgrep works best with UTF-8. For example, ripgrep's regular expression
+  engine supports Unicode features. Namely, character classes like `\w` will
+  match all word characters by Unicode's definition and `.` will match any
+  Unicode codepoint instead of any byte. These constructions assume UTF-8,
+  so they simply won't match when they come across bytes in a file that aren't
+  UTF-8.
+* To handle the UTF-16 case, ripgrep will do something called "BOM sniffing"
+  by default. That is, the first three bytes of a file will be read, and if
+  they correspond to a UTF-16 BOM, then ripgrep will transcode the contents of
+  the file from UTF-16 to UTF-8, and then execute the search on the transcoded
+  version of the file. (This incurs a performance penalty since transcoding
+  is slower than regex searching.)
+* To handle other cases, ripgrep provides a `-E/--encoding` flag, which permits
+  you to specify an encoding from the
+  [Encoding Standard](https://encoding.spec.whatwg.org/#concept-encoding-get).
+  ripgrep will assume *all* files searched are the encoding specified and
+  will perform a transcoding step just like in the UTF-16 case described above.
+
+By default, ripgrep will not require its input be valid UTF-8. That is, ripgrep
+can and will search arbitrary bytes. The key here is that if you're searching
+content that isn't UTF-8, then the usefulness of your pattern will degrade. If
+you're searching bytes that aren't ASCII compatible, then it's likely the
+pattern won't find anything. With all that said, this mode of operation is
+important, because it lets you find ASCII or UTF-8 *within* files that are
+otherwise arbitrary bytes.
+
+Finally, it is possible to disable ripgrep's Unicode support from within the
+pattern regular expression. For example, let's say you wanted `.` to match any
+byte rather than any Unicode codepoint. (You might want this while searching a
+binary file, since `.` by default will not match invalid UTF-8.) You could do
+this by disabling Unicode via a regular expression flag:
+
+```
+$ rg '(?-u:.)'
+```
+
+This works for any part of the pattern. For example, the following will find
+any Unicode word character followed by any ASCII word character followed by
+another Unicode word character:
+
+```
+$ rg '\w(?-u:\w)\w'
+```
+
+
+### Common options
+
+ripgrep has a lot of flags. Too many to keep in your head at once. This section
+is intended to give you a sampling of some of the most important and frequently
+used options that will likely impact how you use ripgrep on a regular basis.
+
+* `-h`: Show ripgrep's condensed help output.
+* `--help`: Show ripgrep's longer form help output. (Nearly what you'd find in
+  ripgrep's man page, so pipe it into a pager!)
+* `-i/--ignore-case`: When searching for a pattern, ignore case differences.
+  That is `rg -i fast` matches `fast`, `fASt`, `FAST`, etc.
+* `-S/--smart-case`: This is similar to `--ignore-case`, but disables itself
+  if the pattern contains any uppercase letters. Usually this flag is put into
+  alias or a config file.
+* `-w/--word-regexp`: Require that all matches of the pattern be surrounded
+  by word boundaries. That is, given `pattern`, the `--word-regexp` flag will
+  cause ripgrep to behave as if `pattern` were actually `\b(?:pattern)\b`.
+* `-c/--count`: Report a count of total matched lines.
+* `--files`: Print the files that ripgrep *would* search, but don't actually
+  search them.
+* `-a/--text`: Search binary files as if they were plain text.
+* `-z/--search-zip`: Search compressed files (gzip, bzip2, lzma, xz). This is
+  disabled by default.
+* `-C/--context`: Show the lines surrounding a match.
+* `--sort-files`: Force ripgrep to sort its output by file name. (This disables
+  parallelism, so it might be slower.)
+* `-L/--follow`: Follow symbolic links while recursively searching.
+* `-M/--max-columns`: Limit the length of lines printed by ripgrep.
+* `--debug`: Shows ripgrep's debug output. This is useful for understanding
+  why a particular file might be ignored from search, or what kinds of
+  configuration ripgrep is loading from the environment.