You can install custom themes by copying them into your ~/.config/ttrv/themes/ directory. The name of the theme will match the name of the file.
$ cp my-custom-theme.cfg ~/.config/ttrv/themes/
$ ttrv --theme my-custom-theme
If you've created a cool theme and would like to share it with the community, please submit a pull request!
Color support on modern terminals can be split into 4 categories:
- No support for colors
- 8 system colors - Black, Red, Green, Yellow, Blue, Magenta, Cyan, and White
- 16 system colors - Everything above + bright variations
- 256 extended colors - Everything above + 6x6x6 color palette + 24 greyscale colors
The 256 terminal color codes, image from https://github.com/eikenb/terminal-colors
The 16 system colors, along with the default foreground and background, can usually be customized through your terminal's profile settings. The 6x6x6 color palette and grayscale colors are constant RGB values across all terminals. TTRV's default theme only uses the 8 primary system colors, which is why it matches the "look and feel" of the terminal that you're running it in.
Setting the 16 system colors in iTerm preferences
The curses library determines your terminal's color support by reading your
environment's $TERM variable, and looking up your terminal's
capabilities in the terminfo
database. You can emulate this behavior by using the tput command:
bash$ export TERM=xterm
bash$ tput colors
8
bash$ export TERM=xterm-256color
bash$ tput colors
256
bash$ export TERM=vt220
bash$ tput colors
-1
In general you should not be setting your $TERM variable manually,
it will be set automatically by you terminal. Often, problems with
terminal colors can be traced back to somebody hardcoding
TERM=xterm-256color in their .bashrc file.
Here's an example of what an TTRV theme file looks like:
[theme]
;<element> = <foreground> <background> <attributes>
Normal = default default normal
Selected = default default normal
SelectedCursor = default default reverse
TitleBar = cyan - bold+reverse
OrderBar = yellow - bold
OrderBarHighlight = yellow - bold+reverse
HelpBar = cyan - bold+reverse
Prompt = cyan - bold+reverse
NoticeInfo = - - bold
NoticeLoading = - - bold
NoticeError = - - bold
NoticeSuccess = - - bold
CursorBlock = - - -
CursorBar1 = magenta - -
CursorBar2 = cyan - -
CursorBar3 = green - -
CursorBar4 = yellow - -
CommentAuthor = blue - bold
CommentAuthorSelf = green - bold
CommentCount = - - -
CommentText = - - -
Created = - - -
Downvote = red - bold
Gold = yellow - bold
HiddenCommentExpand = - - bold
HiddenCommentText = - - -
MultiredditName = yellow - bold
MultiredditText = - - -
NeutralVote = - - bold
NSFW = red - bold+reverse
Saved = green - -
Score = - - -
Separator = - - bold
Stickied = green - -
SubscriptionName = yellow - bold
SubscriptionText = - - -
SubmissionAuthor = green - bold
SubmissionFlair = red - -
SubmissionSubreddit = yellow - -
SubmissionText = - - -
SubmissionTitle = - - bold
Upvote = green - bold
Link = blue - underline
LinkSeen = magenta - underline
UserFlair = yellow - bold
Every piece of text drawn on the screen is assigned to an <element>,
which has three properties:
<foreground>: The text color<background>: The background color<attributes>: Additional text attributes, like bold or underlined
The <foreground> and <background> properties can be set to any the following values:
default, which means use the terminal's default foreground or background color.- The 16 system colors:
black dark_gray red bright_red green bright_green yellow bright_yellow blue bright_blue magenta bright_magenta cyan bright_cyan light_gray white ansi_{n}, where n is between 0 and 255. These will map to their corresponding ANSI colors (see the figure above).- Hex RGB codes, like
#0F0F0F, which will be converted to their nearest ANSI color. This is generally not recommended because the conversion process downscales the color resolution and the resulting colors will look "off".
The <attributes> property can be set to any of the following values:
normal,bold,underline, orstandout.reversewill swap the foreground and background colors.
Attributes can be mixed together using the + symbol. For example,
bold+underline will make the text bold and underlined.
TTRV themes use special "modifer" elements to define the default
application style. This allows you to do things like set the default
background color without needing to set <background> on every
single element. The three modifier elements are:
Normal- The default modifier that applies to all text elements.Selected- Applies to text elements that are highlighted on the page.SelectedCursor- LikeSelected, but only applies toCursorBlockandCursorBar{n}elements.
When an element is marked with a - token, it means inherit the
attribute value from the relevant modifier. This is best explained
through an example:
[theme]
;<element> = <foreground> <background> <attributes>
Normal = ansi_241 ansi_230 normal
Selected = ansi_241 ansi_254 normal
Link = ansi_33 - underline
The default solarized-light theme
In the snippet above, the Link element has its background color set
to the - token. This means that it will inherit it's background
from either the Normal (light yellow, ansi_230) or the Selected (light grey, ansi_254)
element, depending on if it's selected or not.
Compare this with what happens when the Link background is hard-coded to ansi_230:
[theme]
;<element> = <foreground> <background> <attributes>
Normal = ansi_241 ansi_230 normal
Selected = ansi_241 ansi_254 normal
Link = ansi_33 ansi_230 underline
The Link element hard-coded to ansi_230
In this case, the Link background stays yellow (ansi_230) even when the link is
selected by the cursor.