A lot of the escape sequences on the "CSI Ps ; Ps ; Ps t" form are
expected to return a reply. Thus, not having these implemented means
we will hang if the client sends these escapes.
Not all of these escapes can be meaningfully implemented on Wayland,
and thus this implementation is best effort.
We now support the following escapes:
* 11t - report if window is iconified (always replies "no")
* 13t - report window position (always replies 0,0)
* 13;2t - report text area position (replies with margins, since we
cannot get the window's position)
* 14t - report text area size, in pixels
* 14;2t - report window size, in pixels
* 15t - report screen size, in pixels
* 16t - report cell size, in pixels
* 18t - report text area size, in cells
* 19t - report screen size, in cells
All are printf() formatter related. Even if a variable is e.g. a
'short', when used in an expression like '<variable> - 1' it is
promoted to an 'int'.
Closes#16
This fixes an issue where we failed to restore the cursor correctly
when exiting from the alternate screen, if the client had sent escapes
to save the cursor position while inside the alternate screen.
This was because we used the *same* storage for saving the cursor
position through escapes, as for saving it when entering the alternate
screen.
Fix by using a custom variable dedicated to normal <--> alt screen
switching.
Update the sixels' 'row' attribute when re-flowing a grid, to ensure
it is rendered at the correct place.
This should work in most cases, but will break when the cell size has
changed (e.g. font size increase/decrease, or a DPI change).
This patch also moves the sixel image list from the terminal struct
into the grid struct. The sixels are per-grid after all.
Assume we don't handle 'CSI 4 X'. Furthermore, assume we receive the
following: 'CSI 1;2;3;4X'. In this case, only log '4X' as un-handled,
not the entire CSI string.
This implements the following queries:
* report window size in pixels
* report cell size in pixels
* report window size in chars
We also log a warning for the remaining window operation queries.
Blinking can be enabled either by setting the cursor style with
CSI Ps SP q
and selecting a blinking style.
Or, with 'CSI ? 12 h'
Note that both affect the same internal state. I.e. you can disable
blinking with CSI ? 12l after having selected a blinking cursor
style. This is consistent with XTerm behavior.
Having them as error messages was nice when we where still missing
lots of sequences.
Now we don't anymore, and these just spam stdout as well as syslog
when e.g. cat:ing binary data.
Report us as being VT220, as VT420 causes vttest to send a
DECRQSS. This is a DCS request that we don't implement (there's no DCS
handling *at all* - all DCS strings are ignored).
Should be ok as no one appears to care about this one. Other terminals
report a much lower level (urxvt for example, replies with vt100. We
used to reply with vt102, which also was fine).
Pretend we're a VT420, with a couple of supported features
indicated. Note that I haven't verified we support *everything* that
each features entails - or even what exactly a feature *is* (locator
port?)
When support was added for DECOM (absolute/relative row addressing), a
small but noticeable (~3.5%) performance regression was introduced.
Try to improve the situation by simplifying the relative-to-absolute
conversion; only the row needs to be transformed.
* It takes a parameter, that indicates the number of tab stops to move
through
* Use the tab stops defined in the tab stops list, not hard coded mod
8 columns.
The default is absolute mode, where 0,0 is the upper left corner of
the screen.
In relative mode, the origin is relative the top scroll margin.
Internally, we always track the current cursor position in absolute
mode. Every time we the client *sets* or *queries* the cursor position
in relative mode, we translate it to absolute.
