Revert "Implement style configuration."

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-aerc-stylesets(7)
-
-# Name
-
-aerc-stylesets - styleset file specification for *aerc*(1)
-
-# SYNOPSIS
-
-aerc uses a simple configuration syntax to configure the styleset for
-its ui.
-
-# Styleset Configuration
-
-Aerc uses a simple configuration file to describe a styleset. The
-styleset is described as key, value pairs. In each line, the key
-represents the style object it signifies and the color/atrribute of
-that is modified.
-
-For example, in the line below, the foreground color of the
-style object "msglist_unread" is set to "cornflowerblue"
-```
-msglist_unread.fg=cornflowerblue
-```
-
-The configuration also allows wildcard matching of the style_objects
-to configure multiple style objects at a time.
-
-## Style
-The following options are available to be modified for each of the
-style objects.
-
-*fg*
-	The foreground color of the style object is set.
-
-	Syntax: `<style_object>.fg=<color>`
-
-*bg*
-	The background color of the style object is set.
-
-	Syntax: `<style_object>.bg=<color>`
-
-*bold*
-	The bold attribute of the style object is set/unset.
-
-	Syntax: `<style_object>.bold=<true|false|toggle>`
-
-*blink*
-	The blink attribute of the style object is set/unset.
-	_The terminal needs to support blinking text_
-
-	Syntax: `<style_object>.bold=<true|false|toggle>`
-
-*underline*
-	The underline attribute of the style object is set/unset.
-	_The terminal needs to support underline text_
-
-	Syntax: `<style_object>.underline=<true|false|toggle>`
-
-*reverse*
-	Reverses the color of the style object. Exchanges the foreground
-	and background colors.
-
-	Syntax: `<style_object>.reverse=<true|false|toggle>`
-	_If the value is false, it doesn't change anything_
-
-*normal*
-	All the attributes of the style object are unset.
-
-	Syntax: `<style_object>.normal=<true>`
-	_The value doesn't matter_
-
-*default*
-	Set the style object to the default style of the context. Usually
-	based on the terminal.
-
-	Syntax: `<style_object>.default=<true>`
-	_The value doesn't matter_
-
-## Style Objects
-The style objects represent the various ui elements or ui instances for
-styling.
-
-[[ *Style Object*
-:[ *Description*
-|  default
-:  The default style object used for normal ui elements while not
-   using specialized configuration.
-|  error
-:  The style used to show errors.
-|  warning 
-:  The style used when showing warnings.
-|  success
-:  The style used for success messages.
-|  title
-:  The style object used to style titles in ui elements.
-|  header
-:  The style object used to style headers in ui elements.
-|  statusline_default
-:  The default style applied to the statusline.
-|  statusline_error
-:  The style used for error messages in statusline.
-|  statusline_success
-:  The style used for success messages in statusline.
-|  msglist_default
-:  The default style for messages in a message list.
-|  msglist_unread
-:  Unread messages in a message list.
-|  msglist_read
-:  Read messages in a message list.
-|  msglist_deleted
-:  The messages marked as deleted.
-|  msglist_marked
-:  The messages with the marked flag.
-|  msglist_flagged
-:  The messages with the flagged flag.
-|  dirlist_default
-:  The default style for directories in the directory list.
-|  completion_default
-:  The default style for the completion engine.
-|  completion_gutter
-:  The completion gutter.
-|  completion_pill
-:  The completion pill.
-|  tab
-:  The style for the tab bar.
-|  stack
-:  The style for ui stack element.
-|  spinner
-:  The style for the loading spinner.
-|  border
-:  The style used to draw borders. *Only the background color is used*.
-|  selecter_default
-:  The default style for the selecter ui element.
-|  selecter_focused
-:  The focused item in a selecter ui element.
-|  selecter_chooser
-:  The item chooser in a selecter ui element.
-
-## fnmatch style wildcard matching
-The styleset configuration can be made simpler by using the fnmatch
-style wildcard matching for the style object.
-
-The special characters used in the fnmatch wildcards are:
-[[ *Pattern*
-:[ *Meaning*
-|  \*
-:  Matches everything
-|  \?
-:  Matches any single character
-
-For example, the following wildcards can be made using this syntax.
-[[ *Example*
-:[ Description
-|  \*.fg=blue
-:  Set the foreground color of all style objects to blue.
-|  \*list.bg=hotpink
-:  Set the background color of all style objects that end in list 
-   to hotpink.
-
-## Selected modifier
-Selected modifier can be applied to any style object. The style provided for
-the selected modifier are applied on top of the style object it corresponds to.
-
-If you would like to make sure message that are flagged as read in the msglist
-appear in yellow foreground and black background. You can specify that with
-this.
-
-\tmsglist_default.selected.fg=yellow
-\tmsglist_default.selected.bg=black
-
-If we specify the global style selected modifer using fnmatch as below:
-
-\t\*.selected.reverse=toggle
-
-This toggles the reverse switch for selected version of all the style objects.
-
-## Colors
-The color values are set using the values accepted by the tcell library.
-The values can be one of the following.
-
-	*default*
-		The color is set as per the system or terminal default.
-
-	*<Color name>*
-		Any w3c approved color name is used to set colors for the style.
-
-	*<Hex code>*
-		Hexcode for a color can be used. The format must be "\#XXXXXX"
-