Don't change active window when fzf is up

FZF uses Control+hjkl key combos for movement and it interferes with
this plugin. This commit adds the FZF process name(fzf) to the list of
programs that make this plugin not automatically trigger a window change.

This plugin also adds instructions to the readme file in case a user
wants to add their own programs to the list, or remove existing ones.

closes christoomey#346

README.md

@@ -66,7 +66,7 @@ Add the following to your `~/.tmux.conf` file:
 # Smart pane switching with awareness of Vim splits.
 # See: https://github.com/christoomey/vim-tmux-navigator
 is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
-    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?)(diff)?$'"
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf)(diff)?$'"
 bind-key -n 'C-h' if-shell "$is_vim" 'send-keys C-h'  'select-pane -L'
 bind-key -n 'C-j' if-shell "$is_vim" 'send-keys C-j'  'select-pane -D'
 bind-key -n 'C-k' if-shell "$is_vim" 'send-keys C-k'  'select-pane -U'
@@ -186,6 +186,15 @@ mapping.
 
 ### Additional Customization
 
+#### Ignoring programs that use Ctrl+hjkl movement
+
+In interactive programs such as FZF, Ctrl+hjkl can be used instead of the arrow keys to move the selection up and down. If vim-tmux-navigator is getting in your way trying to change the active window instead, you can make it be ignored and work as if this plugin were not enabled. Just modify the `is_vim` variable(that you have either on the snipped you pasted on `~/.tmux.conf` or on the `vim-tmux-navigator.tmux` file). For example, to add the program `foobar`:
+
+```diff
+- is_vim="ps -o state= -o comm= -t '#{pane_tty}' | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf)(diff)?$'"
++ is_vim="ps -o state= -o comm= -t '#{pane_tty}' | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf|foobar)(diff)?$'"
+```
+
 #### Restoring Clear Screen (C-l)
 
 The default key bindings include `<Ctrl-l>` which is the readline key binding
@@ -231,7 +240,7 @@ to conditionally wrap based on position on screen:
 
 ```tmux
 is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
-    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?)(diff)?$'"
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf)(diff)?$'"
 bind-key -n 'C-h' if-shell "$is_vim" { send-keys C-h } { if-shell -F '#{pane_at_left}'   {} { select-pane -L } }
 bind-key -n 'C-j' if-shell "$is_vim" { send-keys C-j } { if-shell -F '#{pane_at_bottom}' {} { select-pane -D } }
 bind-key -n 'C-k' if-shell "$is_vim" { send-keys C-k } { if-shell -F '#{pane_at_top}'    {} { select-pane -U } }

pattern-check

@@ -11,8 +11,8 @@ GREEN=$(tput setaf 2)
 YELLOW=$(tput setaf 3)
 NORMAL=$(tput sgr0)
 
-vim_pattern='(^|\/)g?(view|l?n?vim?x?)(diff)?$'
-match_tests=(vim Vim VIM vimdiff lvim /usr/local/bin/vim vi gvim view gview nvim vimx)
+vim_pattern='(^|\/)g?(view|l?n?vim?x?|fzf)(diff)?$'
+match_tests=(vim Vim VIM vimdiff lvim /usr/local/bin/vim vi gvim view gview nvim vimx fzf)
 no_match_tests=( /Users/christoomey/.vim/thing /usr/local/bin/start-vim )
 
 display_matches() {

vim-tmux-navigator.tmux

@@ -3,7 +3,7 @@
 version_pat='s/^tmux[^0-9]*([.0-9]+).*/\1/p'
 
 is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
-    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?)(diff)?$'"
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf)(diff)?$'"
 tmux bind-key -n C-h if-shell "$is_vim" "send-keys C-h" "select-pane -L"
 tmux bind-key -n C-j if-shell "$is_vim" "send-keys C-j" "select-pane -D"
 tmux bind-key -n C-k if-shell "$is_vim" "send-keys C-k" "select-pane -U"