plugins: Add Theme plugin

plugins/themes/README.md

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+# Themes Plugin
+
+This plugin allows you to change Oh-My-Bash themes on the go.
+
+To use it, add `themes` to the plugins array in your `.bashrc` file:
+
+```
+plugins=(... themes)
+```
+
+This is based off the [themes oh-my-zsh plugin](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/themes).
+
+## Usage
+
+`theme <theme_name>` - Changes the theme to specified theme.
+
+`theme ` - Changes the theme to some random theme.
+
+`lstheme ` - Lists installed themes.

plugins/themes/themes.plugin.sh

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+#! bash oh-my-bash.module
+
+# Load the given theme, or a random one if none is provided.
+function theme() {
+  local desired_theme="$1"
+
+  # Random
+  if [[ -z "$desired_theme" ]]; then
+    local theme_files
+    _omb_util_glob_expand theme_files '"$OSH"/themes/*/*.theme.sh'
+    theme_files=("${theme_files[@]}")
+
+    if ((${#theme_files[@]})); then
+      local random_theme=${theme_files[RANDOM%${#theme_files[@]}]}
+      desired_theme=$(basename $(dirname "$random_theme"))
+      echo "${_omb_term_reset}theme ${_omb_term_bold}${desired_theme}$_omb_term_reset"
+    else
+      echo "No themes found."
+      return 1
+    fi
+  fi
+
+  _omb_module_require_theme "$desired_theme"
+}
+
+# List all available themes
+function lstheme() {
+  local theme_files
+  _omb_util_glob_expand theme_files '"$OSH"/themes/*/*.theme.sh'
+  for i in "${theme_files[@]}"; do
+    echo $(basename $(dirname "$i"))
+  done
+}