Add syntax highlighting to examples in README

README.md

@@ -76,10 +76,10 @@ variables to your `~/.zshrc`.
 
 So if you wanted to set these variables manually, you would put the following in
 your `~/.zshrc`:
-
+```zsh
 POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(context dir rbenv vcs)
 POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status history time)
-
+```
 #### Available Prompt Segments
 The segments that are currently available are:
 
@@ -198,17 +198,17 @@ The `custom_...` segment allows you to turn the output of a custom command into
 a prompt segment. As an example, if you wanted to create a custom segment to
 display your WiFi signal strength, you might define a custom segment called
 `custom_wifi_signal` like this:
-
+```zsh
 POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(context time battery dir vcs virtualenv custom_wifi_signal)
 POWERLEVEL9K_CUSTOM_WIFI_SIGNAL="echo signal: \$(nmcli device wifi | grep yes | awk '{print \$8}')"
 POWERLEVEL9K_CUSTOM_WIFI_SIGNAL_BACKGROUND="blue"
 POWERLEVEL9K_CUSTOM_WIFI_SIGNAL_FOREGROUND="yellow"
-
+```
 If you prefer, you can also define the function in your `.zshrc` rather than
 putting it in-line with the variable export, as shown above. Just don't forget
 to invoke your function from your segment! Example code that achieves the same
 result as the above:
-
+```zsh
 zsh_wifi_signal(){
     local signal=$(nmcli device wifi | grep yes | awk '{print $8}')
     local color='%F{yellow}'
@@ -219,7 +219,7 @@ result as the above:
 
 POWERLEVEL9K_CUSTOM_WIFI_SIGNAL="zsh_wifi_signal"
 POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(context time battery dir vcs virtualenv custom_wifi_signal)
-
+```
 The command, above, gives you the wireless signal segment shown below:
 
 ![signal](http://i.imgur.com/hviMATC.png)
@@ -253,11 +253,11 @@ Powerline" fonts, there are additional glyphs, as well:
 | None       | None      | ![](https://cloud.githubusercontent.com/assets/1544760/12183452/40f79286-b58f-11e5-9b8c-ed1343a07b08.png) | Outside of your home folder |
 
 To turn off these icons you could set these variables to an empty string.
-
+```zsh
 POWERLEVEL9K_HOME_ICON=''
 POWERLEVEL9K_HOME_SUB_ICON=''
 POWERLEVEL9K_FOLDER_ICON=''
-
+```
 You can limit the output to a certain length by truncating long paths.
 Customizations available are:
 
@@ -269,11 +269,11 @@ Customizations available are:
 
 For example, if you wanted the truncation behavior of the `fish` shell, which
 truncates `/usr/share/plasma` to `/u/s/plasma`, you would use the following:
-
+```zsh
 POWERLEVEL9K_SHORTEN_DIR_LENGTH=1
 POWERLEVEL9K_SHORTEN_DELIMITER=""
 POWERLEVEL9K_SHORTEN_STRATEGY="truncate_from_right"
-
+```
 In each case you have to specify the length you want to shorten the directory
 to. So in some cases `POWERLEVEL9K_SHORTEN_DIR_LENGTH` means characters, in
 others whole directories.
@@ -343,16 +343,16 @@ See [Unit Test Ratios](#unit-test-ratios), below.
 |`POWERLEVEL9K_TIME_FORMAT`|`'H:M:S'`|ZSH time format to use in this segment.|
 
 As an example, if you wanted a reversed time format, you would use this:
-
+```zsh
 # Reversed time format
 POWERLEVEL9K_TIME_FORMAT='%D{%S:%M:%H}'
-
+```
 If you are using an "Awesome Powerline Font", you can add a time symbol to this
 segment, as well:
-
+```zsh
 # Output time, date, and a symbol from the "Awesome Powerline Font" set
 POWERLEVEL9K_TIME_FORMAT="%D{%H:%M:%S \uE868  %d.%m.%y}"
-
+```
 ##### vcs
 
 By default, the `vcs` segment will provide quite a bit of information. Further