Budspencer theme improvements

- Bookmarks and command/directory history functions implemented
- Function to edit commandline with $EDITOR
- Faster git parser

themes/budspencer/README.md

 # budspencer theme
 
-Translation of zsh's prezto [budspencer theme][budspencer].
+Translation of zsh's prezto [budspencer theme][budspencer]. This theme is
+optimized for visibility and a fast workflow.
+
+## Requirements
+
+Non standard tools:
+
+* xsel
+* git
 
 ## Configuration
 
-The theme behaves similar to vim's airline/powerline plugins. It needs a
+The theme behaves similar to vim's airline/powerline plugins. Thus, it needs a
 [powerline font][font]. Although it works with emacs mode, it's more powerful
 with vi mode. In order to enable vi mode, put the following lines into
 `$HOME/.config/fish/config.fish` before `set fish_path $HOME/.oh-my-fish`:
 
 ```
-set -e fish_key_bindings
 set -U fish_key_bindings fish_vi_key_bindings
 ```
 
 ## Left prompt segments
 
-- Vi mode indicator
+- Vi mode indicator similar to vim airline/powerline, cursor color also changes
+  if terminal supports it
 - Git repository information
 - Status symbols
+  * ⌘: present working directory is in bookmark list, can be toggled with `#` to
+      show the number of the bookmark
   * V: vi is parent process
   * R: [ranger][ranger] is parent process
-  * ⚙: there are background jobs
+  * ⚙: there are background jobs, can be toggled with `#` to show the amount of
+      background jobs
   * : no write permissions in present working directory
-  * ✔: last command succeeded
-  * ✘: last command failed
+  * ✔: last command succeeded, can be toggled with `#` to show the status value
+  * ✘: last command failed, can be toggled with `#` to show the status value
   * ⚡: superuser indicator
+- Present working directory
 
 ## Right prompt segments
 
 - Last command's duration time
 - Git status
-  * style can be toggled in NORMAL and in VISUAL mode with `#` between
-    - `symbols` (shows git status symbols, see below)
-    - `counts` (shows amount of files that are affected)
   * symbols:
     - ↑: git repository is ahead origin
     - ↓: git repository is behind origin
-    - +: new files were added
-    - –: files have been deleted
-    - ✱: files have been modified
-    - →: files have been renamed
+    - +: changes have been added to git index
+    - –: files have been deleted in work tree
+    - ✱: files have been modified in work tree
+    - →: files have been renamed in git index
     - ═: there are unmerged commits
-    - ●: there are untracked files
+    - ●: there are untracked (new) files
     - ✭: there are stashed commits
-- Present working directory
-  * style can be toggled in NORMAL and in VISUAL mode with space bar
+
+## Toggle prompt segments
+
+The following shortcuts need vi-mode:
+- Style of "present working directory"-segment can be toggled in NORMAL and in
+  VISUAL mode with space bar
   * styles implemented:
-    - `short` (show truncated path)
-    - `long` (show full path)
-    - `none` (show nothing)
-  * configurable by global array `$PWDSTYLE` (if not set, defaults to `short long none`)
+    - `short` (shows username, short hostname and truncated path; recommended in
+      most cases)
+    - `long` (shows username, full hostname and full path; useful for copy-paste
+      in ssh connections)
+    - `none` (shows nothing except small delimiter; useful for small terminals)
+    - If prompt is toggled with `#`, the IP address is shown instead of the
+        hostname.
+  * configurable by global list `$PWDSTYLE` (if not set, defaults to
+    `short long none`); put `set -g PWDSTYLE none long` into
+    `$HOME/.config/fish/budspencer_config.fish` if you want to toggle only between
+    `none` and `long`.
+
+- Style of symbols can be toggled in NORMAL and in VISUAL mode with `#`
+  * styles implemented:
+    - `symbols` (shows status symbols)
+    - `numbers` (shows numbers instead of symbols in left prompt as well as amount of changes in
+        right git prompt)
+
+## Quickly navigate in history of working directories
+
+There is a function `d` that shows the history as enumerated list. Unlike
+fish's builtin `dirh`, `d` does not show any duplicates. Enter a number to jump
+to a directory within the list. It's also possible to give that number directly as
+argument to the `d` function.
+
+The following shortcuts need vi-mode:
+- Press `H` in NORMAL mode to change present working directory to previous
+  working directory in history.
+- Press `L` in NORMAL mode to change present working directory to next working
+  directory in history.
+
+## Quickly navigate in command history
+
+The function `c` shows the command history as enumerated list equivalently to
+the `d` function. Selections are also paste into the X clipboard.
+
+## Bookmarks
+
+A bookmark can be created with `mark`. It can be removed with `unmark`.
+Bookmarks are persistent and universal.
+They are stored in `$HOME/.config/fish/budspencer_config.fish`.
+A new shell automatically changes working directory on startup to newest bookmark.
+`m` is a function that shows the bookmarks as enumerated list equivalently to `d`.
+
+The following shortcuts need vi mode:
+- Create a bookmark for present working directory with `m` in NORMAL mode.
+- Remove a bookmark for present working directory with `M` in NORMAL mode.
+
+## Edit commandline with your favorite editor
+
+The function `edit-commandline` let you edit the commandline with your editor.
+It makes your commandline as powerful as your editor. If `$EDITOR` is not set,
+use vi.
+
+The following shortcut needs vi mode:
+- Type `.` in NORMAL mode to edit commandline in editor.
 
 ## Screenshot
 

themes/budspencer/fish_greeting.fish

+###############################################################################
+#
+# Prompt theme name:
+#   budspencer
+#
+# Description:
+#   a sophisticated airline/powerline theme
+#
+# Author:
+#   Joseph Tannhuber <sepp.tannhuber@yahoo.de>
+#
+# Sections:
+#   -> Functions
+#     -> Help
+#     -> Welcome message
+#
+###############################################################################
+
+###############################################################################
+# => Functions
+###############################################################################
+
+#########
+# => Help
+#########
+function budspencer_help -d "Shows helpfile"
+	set -l readme_file $fish_path"/themes/budspencer/README.md"
+	if set -q PAGER
+		if test -e $readme_file
+			eval $PAGER $readme_file
+		else
+			set_color $fish_color_error
+			echo $readme_file" wasn't found."
+		end
+	else
+		open $readme_file
+	end
+end
+
+####################
+# => Welcome message
+####################
+function fish_greeting -d "Show greeting in login shell."
+	if begin
+		test (count $bookmarks) -gt 0
+		and not set -q -x LOGIN
+		and not set -q -x RANGER_LEVEL
+		and not set -q -x VIM
+	end
+    	echo This is oh-my-fish\'s (set_color -b 083746 268bd2)budspencer(set_color normal) theme.
+    	echo Type (set_color -b 083746 cb4b16)»budspencer_help«(set_color normal) in order to see how you can speed up your workflow.
+    	set_color normal
+    end
+end