[New Segment]: variable segment

README.md

@@ -107,6 +107,7 @@ The segments that are currently available are:
 * [`user`](segments/user/README.md) - Your current username
 * [`vi_mode`](segments/vi_mode/README.md)- Your prompt's Vi editing mode (NORMAL|INSERT).
 * [`ssh`](segments/ssh/README.md) - Indicates whether or not you are in an SSH session.
+* [`variable`](segments/variable/README.md) - Displays the value of a given variable.
 
 **Development Environment Segments:**
 * [`vcs`](segments/vcs/README.md) - Information about this `git` or `hg` repository (if you are in one).

segments/variable/README.md

@@ -0,0 +1,27 @@
+# Variable
+
+## Installation
+
+To use this segment, you need to activate it by adding `variable` to your
+`P9K_LEFT_PROMPT_ELEMENTS` or `P9K_RIGHT_PROMPT_ELEMENTS` array, depending
+where you want to show this segment.
+
+## Configuration
+
+| Variable | Default Value | Description |
+|----------|---------------|-------------|
+|`P9K_VARIABLE_NAME`|`LANG`|Change this to set the variable to read from|
+|`P9K_VARIABLE_SHOW_NAME`|`false`|Set to true if you wish to show the name of the variable|
+
+### Color Customization
+
+You can change the foreground and background color of this segment by setting
+```
+P9K_VARIABLE_FOREGROUND='red'
+P9K_VARIABLE_BACKGROUND='blue'
+```
+
+### Customize Icon
+
+The main Icon can be changed by setting `P9K_VARIABLE_ICON="my_icon"`. To change the
+icon color only, set `P9K_VARIABLE_ICON_COLOR="red"`.

segments/variable/variable.p9k

@@ -0,0 +1,39 @@
+# vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
+################################################################
+# @title powerlevel9k Segment - Variable
+# @source [powerlevel9k](https://github.com/bhilburn/powerlevel9k)
+##
+
+(){
+  # Set the right locale to protect special characters
+  local LC_ALL="" LC_CTYPE="en_US.UTF-8"
+  ################################################################
+  # Register segment
+  # Parameters:
+  #   segment_name  context  background  foreground  Generic  Flat/Awesome-Patched  Awesome-FontConfig  Awesome-Mapped-FontConfig  NerdFont
+  #                                                                                                            
+  p9k::register_segment "VARIABLE" "" "${DEFAULT_COLOR_INVERTED}" "${DEFAULT_COLOR}"  ''  ''  ''  ''  ''
+
+  p9k::set_default P9K_VARIABLE_NAME "LANG"
+  p9k::set_default P9K_VARIABLE_SHOW_NAME false
+}
+
+################################################################
+# @description
+#   Outputs the content of a given variable
+##
+# @args
+#   $1 string Alignment - left | right
+#   $2 integer Segment index
+#   $3 boolean Whether the segment should be joined
+##
+prompt_variable() {
+  local variableContent="$(eval echo \$$P9K_VARIABLE_NAME)"
+  if [[ -n "$variableContent" ]]; then
+    if [[ "${P9K_VARIABLE_SHOW_NAME}" == "true" ]]; then
+      p9k::prepare_segment "$0" "" $1 "$2" $3 "${P9K_VARIABLE_NAME}: ${variableContent}"
+    else
+      p9k::prepare_segment "$0" "" $1 "$2" $3 "${variableContent}"
+    fi
+  fi
+}