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

The styleset is described as <object>.<attribute> = <value> pairs.

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 keys to configure multiple style objects at a time.

ATTRIBUTES

The following options are available to be modified for each of the style objects.

<object>.fg = <color>
    The foreground color of the style object is set.

<object>.bg = <color>
    The background color of the style object is set.

<object>.bold = true|false|toggle
    The bold attribute of the style object is set/unset.

<object>.blink = true|false|toggle
    The blink attribute of the style object is set/unset. The terminal needs to support blinking text.

<object>.underline = true|false|toggle
    The underline attribute of the style object is set/unset. The terminal needs to support underline text.

<object>.italic = true|false|toggle
    The italic attribute of the style object is set/unset. The terminal needs to support italic text.

<object>.dim = true|false|toggle
    The dim attribute of the style object is set/unset. The terminal needs to support half-bright text.

<object>.reverse = true|false|toggle
    Reverses the color of the style object. Exchanges the foreground and background colors.

    If the value is false, it doesn't change anything.

<object>.normal = true
    All the attributes of the style object are unset.

    The value doesn't matter.

<object>.default = true
    Set the style object to the default style of the context. Usually based on the terminal.

    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_flagged | The messages with the flagged flag.
msglist_deleted | The messages marked as deleted.
msglist_marked | The messages with the marked flag.
msglist_result | The messages which match the current search.
msglist_answered | The messages marked as answered.
msglist_gutter | The message list gutter.
msglist_pill | The message list pill.
msglist_thread_folded | Visible messages that have folded thread children.
dirlist_default | The default style for directories in the directory list.
dirlist_unread | The style used for directories with unread messages
dirlist_recent | The style used for directories with recent messages
part_switcher | Background for the part switcher in the message viewer.
part_filename | Attachment file name in the part switcher.
part_mimetype | Attachment/part MIME type in the part switcher.
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 bg color is used unless you customize border-char-vertical and/or border-char-horizontal in aerc.conf).
selector_default | The default style for the selector ui element.
selector_focused | The focused item in a selector ui element.
selector_chooser | The item chooser in a selector ui element.

These next style objects only affect the built-in colorize filter and must be declared under a [viewer] section of the styleset file.

Style Object | Description
url | URLs.
header | RFC-822-like header names.
signature | Email signatures.
diff_meta | Patch diff meta lines.
diff_chunk | Patch diff chunks.
diff_chunk_func | Patch diff chunk function names.
diff_add | Patch diff added lines.
diff_del | Patch diff deleted lines.
quote_1 | First level quoted text.
quote_2 | Second level quoted text.
quote_3 | Third level quoted text.
quote_4 | Fourth level quoted text.
quote_x | Above fourth level quoted text.

User defined styles can be used to style arbitrary strings in go-templates (see .Style in aerc-templates(7)). User styles must be defined in the [user] ini section. Styles can be referenced by their name (e.g. red.fg is named "red").

Example:

    [user]
    red.fg=red

User styles are layered with other styles applied to the context in which they are rendered. The user style colors (fg and/or bg) will only be effective if the context style does not define any. Other boolean attributes will be merged with the underlying style boolean attributes.

For example, if the context style is:

    fg=red bold

And the inline style is:

    fg=yellow italic underline

The effective style will be:

    fg=red bold italic underline

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.

Note that the statements in a given styleset are parsed in the order in which they are written. That means that with the following styleset:

    msglist_marked.fg = pink
    msglist_*.fg = white

The msglist_marked.fg attribute will be set to white.

SELECTED MODIFIER

The selected modifier can be applied to any style object. The style provided for the selected modifier is 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:

    msglist_default.selected.fg = yellow

    msglist_default.selected.bg = black

If we specify the global style selected modifier using fnmatch as below:

    *.selected.reverse = toggle

This toggles the reverse switch for selected version of all the style objects.

selected objects inherit from all attributes of their non-selected counterparts. selected statements are parsed after non-selected ones and effectively override the attributes of the non-selected style object.

LAYERED STYLES

Some styles, (currently the msglist_* and dirlist_* ones) are applied in layers. If a style differs from the base (in this case *list_default) then that style applies, unless overridden by a higher layer. If fg and bg colors are not defined explicitly (or defined to the default color) they will be considered as "transparent" and the colors from the lower layer will be used instead.

The order that msglist_* styles are applied in is, from first to last:

    1. msglist_default
    2. msglist_unread
    3. msglist_read
    4. msglist_answered
    5. msglist_flagged
    6. msglist_deleted
    7. msglist_result
    8. msglist_thread_folded
    9. msglist_marked

So, the marked style will override all other msglist styles.

The order for dirlist_* styles is:

    1. dirlist_default
    2. dirlist_unread
    3. dirlist_recent

DYNAMIC MESSAGE LIST STYLES

All msglist_* styles can be defined for specific email header values. The syntax is as follows:

    msglist_<name>.<header>,<header_value>.<attribute> = <attr_value>

If <header_value> starts with a tilde character ~, it will be interpreted as a regular expression.

Examples:

    msglist*.X-Sourcehut-Patchset-Update,APPROVED.fg = green
    msglist*.X-Sourcehut-Patchset-Update,NEEDS_REVISION.fg = yellow
    msglist*.X-Sourcehut-Patchset-Update,REJECTED.fg = red
    "msglist_*.Subject,~^(\[[w-]+]\s*)?\[(RFC )?PATCH.fg" = #ffffaf
    "msglist_*.Subject,~^(\[[w-]+]\s*)?\[(RFC )?PATCH.selected.fg" = #ffffaf

When a dynamic style is matched to an email header, it will be used in priority compared to its non-dynamic counterpart. Provided the following styleset:

    msglist_marked.fg = blue
    msglist_*.Subject,~foobar.fg = red

An email with foobar it its subject will be colored in red all the time, since msglist_* also applies to msglist_marked.

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.

<Dec number>
    Color based on the terminal palette index. Valid numbers are between 0 and 255.

DEFAULTS

Before parsing a styleset, it is first initialized with the following defaults:

    *.selected.reverse=toggle
    title.reverse=true
    header.bold=true
    *error.bold=true
    error.fg=red
    warning.fg=yellow
    success.fg=green
    statusline*.default=true
    statusline_default.reverse=true
    statusline_error.fg=red
    statusline_error.reverse=true
    statusline_warning.fg=yellow
    statusline_warning.reverse=true
    msglist_unread.bold=true
    msglist_deleted.fg=gray
    msglist_result.fg=green
    msglist_pill.reverse=true
    part_mimetype.dim=true
    part_mimetype.selected.dim=false
    part_filename.selected.bold=true
    completion_pill.reverse=true
    tab.reverse=true
    border.reverse = true
    selector_focused.reverse=true
    selector_chooser.bold=true

You can choose either to reset everything by starting your styleset with these two lines:

    *.default=true
    *.normal=true

Or selectively override style object attributes.

SEE ALSO

aerc(1) aerc-config(5)

AUTHORS

Originally created by Drew DeVault and maintained by Robin Jarry who is assisted by other open source contributors. For more information about aerc development, see https://sr.ht/~rjarry/aerc/.