Initial cheat repo support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "navi"
-version = "2.0.11"
+version = "2.1.0"
 authors = ["Denis Isidoro <[email protected]>"]
 edition = "2018"
 
@@ -12,4 +12,7 @@ structopt = "0.3"
 termion = "1.5.5"
 raw_tty = "0.1.0"
 lazy_static = "1.4.0"
+dirs = "2.0.0"
 terminal_size = "0.1.10"
+git2 = "0.10.0"
+walkdir = "2"

README.md

@@ -91,19 +91,17 @@ You can use **navi** as a widget to your shell. This way, your history is correc
 In order to use it, add this line to your `.bashrc`-like file:
 ```sh
 # bash
-source "$(navi widget bash)"
+source <(navi widget bash)
 
 # zsh
-source "$(navi widget zsh)"
+source <(navi widget zsh)
 
 # fish
-source (navi widget fish)
+navi widget fish | source
 ```
 
 By default, `Ctrl+G` is assigned to launching **navi**. If you want to change the keybinding, replace the argument of `bind` or `bindkey` in [the widget file](https://github.com/denisidoro/navi/search?q=filename%3Anavi.plugin.*&unscoped_q=filename%3Anavi.plugin.*).
 
-If you want a widget for other shells, please upvote [this issue](https://github.com/denisidoro/navi/issues/37).
-
 ### More options
 
 Please refer to `navi --help` for more details.
@@ -130,7 +128,7 @@ export NAVI_PATH="/folder/with/cheats:/another/folder"
 
 ### Submitting cheatsheets
 
-Feel free to fork this project and open a PR for me to include your contributions.
+Feel free to open a PR on https://github.com/denisidoro/cheats for me to include your contributions.
 
 Cheatsheet syntax
 -----------------
@@ -139,7 +137,7 @@ Cheatsheets are described in `.cheat` files.
 
 ### Syntax overview
 
-- lines starting with `%` determine the start of a new cheatsheet. They should contain tags which will be added to any command in a given file;
+- lines starting with `%` determine the start of a new cheatsheet and should contain tags;
 - lines starting with `#` should be descriptions of commands;
 - lines starting with `;` are ignored. You can use them for metacomments;
 - lines starting with `$` should contain commands that generate a list of possible values for a given argument;
@@ -159,7 +157,7 @@ It's irrelevant how many files are used to store cheatsheets. They can be all in
 
 Commands may be multiline:
 ```sh
-# This will output foo\nyes
+# This will output "foo\nyes"
 echo foo
 true \
    && echo yes \