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Add mouse input notes

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Ryan Prichard 2015-12-14 19:07:08 -06:00
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Introduction
============
The only specification I could find describing mouse input escape sequences
was the /usr/share/doc/xterm/ctlseqs.txt.gz file installed on my Ubuntu
machine.
Here are the relevant escape sequences:
* [ON] CSI '?' M 'h' Enable mouse input mode M
* [OFF] CSI '?' M 'l' Disable mouse input mode M
* [EVT] CSI 'M' F X Y Mouse event (default or mode 1005)
* [EVT6] CSI '<' F ';' X ';' Y 'M' Mouse event with mode 1006
* [EVT6] CSI '<' F ';' X ';' Y 'm' Mouse event with mode 1006 (up)
* [EVT15] CSI F ';' X ';' Y 'M' Mouse event with mode 1015
The first batch of modes affect what events are reported:
* 9: Presses only (not as well-supported as the other modes)
* 1000: Presses and releases
* 1002: Presses, releases, and moves-while-pressed
* 1003: Presses, releases, and all moves
The next batch of modes affect the encoding of the mouse events:
* 1005: The X and Y coordinates are UTF-8 codepoints rather than bytes.
* 1006: Use the EVT6 sequences instead of EVT
* 1015: Use the EVT15 sequence instead of EVT (aka URVXT-mode)
Support for modes in existing terminals
=======================================
| 9 1000 1002 1003 | 1004 | overflow | defhi | 1005 1006 1015
---------------------------------+---------------------+------+--------------+-------+----------------
Eclipse TM Terminal (Neon) | _ _ _ _ | _ | n/a | n/a | _ _ _
gnome-terminal 3.6.2 | X X X X | _ | suppressed*b | 0x07 | _ X X
iTerm2 2.1.4 | _ X X X | OI | wrap*z | n/a | X X X
jediterm/IntelliJ | _ X X X | _ | ch='?' | 0xff | X X X
Konsole 2.13.2 | _ X X *a | _ | suppressed | 0xff | X X X
mintty 2.2.2 | X X X X | OI | ch='\0' | 0xff | X X X
putty 0.66 | _ X X _ | _ | suppressed | 0xff | _ X X
rxvt 2.7.10 | X X _ _ | _ | wrap*z | n/a | _ _ _
screen(under xterm) | X X X X | _ | suppressed | 0xff | _ _ _
urxvt 9.21 | X X X X | _ | wrap*z | n/a | X _ X
xfce4-terminal 0.6.3 (GTK2 VTE) | X X X X | _ | wrap | n/a | _ _ _
xterm | X X X X | OI | ch='\0' | 0xff | X X X
*a: Mode 1003 is handled the same way as 1002.
*b: The coordinate wraps from 0xff to 0x00, then maxs out at 0x07. I'm
guessing this behavior is a bug? I'm using the Xubuntu 14.04
gnome-terminal.
*z: These terminals have a bug where column 224 (and row 224, presumably)
yields a truncated escape sequence. 224 + 32 is 0, so it would normally
yield `CSI 'M' F '\0' Y`, but the '\0' is interpreted as a NUL-terminator.
Problem 1: How do these flags work?
===================================
Terminals accept the OFF sequence with any of the input modes. This makes
little sense--there are two multi-value settings, not seven independent flags!
All the terminals handle Granularity the same way. ON-Granularity sets
Granularity to the specified value, and OFF-Granularity sets Granularity to
OFF.
Terminals vary in how they handle the Encoding modes. For example:
* xterm. ON-Encoding sets Encoding. OFF-Encoding with a non-active Encoding
has no effect. OFF-Encoding otherwise resets Encoding to Default.
* mintty (tested 2.2.2), iTerm2 2.1.4, and jediterm. ON-Encoding sets
Encoding. OFF-Encoding resets Encoding to Default.
* Konsole (tested 2.13.2) seems to configure each encoding method
independently. The effective Encoding is the first enabled encoding in this
list:
- Mode 1006
- Mode 1015
- Mode 1005
- Default
* gnome-terminal (tested 3.6.2) also configures each encoding method
independently. The effective Encoding is the first enabled encoding in
this list:
- Mode 1006
- Mode 1015
- Default
Mode 1005 is not supported.
* xfce4 terminal 0.6.3 (GTK2 VTE) always outputs the default encoding method.