Mark text on screen#
kitty has the ability to mark text on the screen based on regular expressions. This can be useful to highlight words or phrases when browsing output from long running programs or similar. Lets start with a few examples:
Suppose we want to be able to highlight the word
ERROR in the current
window. Add the following to
map f1 toggle_marker text 1 ERROR
Now when you press F1, all instances of the word
ERROR will be
highlighted. To turn off the highlighting, press F1 again.
If you want to make it case-insensitive, use:
map f1 toggle_marker itext 1 ERROR
To make it match only complete words, use:
map f1 toggle_marker regex 1 \\bERROR\\b
Suppose you want to highlight both
map f1 toggle_marker iregex 1 \\bERROR\\b 2 \\bWARNING\\b
kitty supports up to 3 mark groups (the numbers in the commands above). You
can control the colors used for these groups in
mark1_foreground red mark1_background gray mark2_foreground green ...
For performance reasons, matching is done per line only, and only when that line is altered in any way. So you cannot match text that stretches across multiple lines.
Creating markers dynamically#
If you want to create markers dynamically rather than pre-defining them in
kitty.conf, you can do so as follows:
map f1 create_marker map f2 remove_marker
Then pressing F1 will allow you to enter the marker definition and set it
and pressing F2 will remove the marker.
create_marker accepts the
same syntax as
toggle_marker above. Note that while creating markers, the
prompt has history so you can easily re-use previous marker expressions.
You can also use the facilities for Control kitty from scripts to dynamically add or remove markers.
Scrolling to marks#
kitty has a
scroll_to_mark action to scroll to the next line that contains
a mark. You can use it by mapping it to some shortcut in
map ctrl+p scroll_to_mark prev map ctrl+n scroll_to_mark next
Then pressing Ctrl+P will scroll to the first line in the scrollback buffer above the current top line that contains a mark. Pressing Ctrl+N will scroll to show the first line below the current last line that contains a mark. If you wish to jump to a mark of a specific type, you can add that to the mapping:
map ctrl+1 scroll_to_mark prev 1
Which will scroll only to marks of type 1.
The full syntax for creating marks#
The syntax of the
toggle_marker action is:
toggle_marker <marker-type> <specification>
marker-type is one of:
text- Simple substring matching
itext- Case-insensitive substring matching
regex- A Python regular expression
iregex- A case-insensitive Python regular expression
function- An arbitrary function defined in a Python file, see Arbitrary marker functions.
Arbitrary marker functions#
You can create your own marker functions. Create a Python file named
mymarker.py and in it create a
marker function. This function
receives the text of the line as input and must yield three numbers,
the starting character position, the ending character position and the mark
group (1-3). For example:
def marker(text): # Function to highlight the letter X for i, ch in enumerate(text): if ch.lower() == 'x': yield i, i, 3
Save this file somewhere and in
map f1 toggle_marker function /path/to/mymarker.py
If you save the file in the kitty config directory, you can use:
map f1 toggle_marker function mymarker.py