Add ncurses extended key support

[mckellyln]

Keys added, if terminfo reports feature -

    { "kUP3",   "Alt-Up",              "A-Up"          },
    { "kUP4",   "Alt-Shift-Up",        "A-S-Up"        },
    { "kUP5",   "Ctrl-Up",             "C-Up"          },
    { "kUP6",   "Ctrl-Shift-Up",       "C-S-Up"        },
    { "kUP7",   "Alt-Ctrl-Up",         "A-C-Up"        },
    { "kDN3",   "Alt-Down",            "A-Down"        },
    { "kDN4",   "Alt-Shift-Down",      "A-S-Down"      },
    { "kDN5",   "Ctrl-Down",           "C-Down"        },
    { "kDN6",   "Ctrl-Shift-Down" ,    "C-S-Down"      },
    { "kDN7",   "Alt-Ctrl-Down",       "A-C-Down"      },
    { "kRIT3",  "Alt-Right",           "A-Right"       },
    { "kRIT4",  "Alt-Shift-Right",     "A-S-Right"     },
    { "kRIT5",  "Ctrl-Right",          "C-Right"       },
    { "kRIT6",  "Ctrl-Shift-Right",    "C-S-Right"     },
    { "kRIT7",  "Alt-Ctrl-Right",      "A-C-Right"     },
    { "kLFT3",  "Alt-Left",            "A-Left"        },
    { "kLFT4",  "Alt-Shift-Left",      "A-S-Left"      },
    { "kLFT5",  "Ctrl-Left",           "C-Left"        },
    { "kLFT6",  "Ctrl-Shift-Left",     "C-S-Left"      },
    { "kLFT7",  "Alt-Ctrl-Left",       "A-C-Left"      },
    { "kIC3",   "Alt-Insert",          "A-Insert"      },
    { "kIC4",   "Alt-Shift-Insert",    "A-S-Insert"    },
    { "kIC5",   "Ctrl-Insert",         "C-Insert"      },
    { "kIC6",   "Ctrl-Shift-Insert",   "C-S-Insert"    },
    { "kIC7",   "Alt-Ctrl-Insert",     "A-C-Insert"    },
    { "kDC3",   "Alt-Delete",          "A-Delete"      },
    { "kDC4",   "Alt-Shift-Delete",    "A-S-Delete"    },
    { "kDC5",   "Ctrl-Delete",         "C-Delete"      },
    { "kDC6",   "Ctrl-Shift-Delete",   "C-S-Delete"    },
    { "kDC7",   "Alt-Ctrl-Delete",     "A-C-Delete"    },
    { "kHOM3",  "Alt-Home",            "A-Home"        },
    { "kHOM4",  "Alt-Shift-Home",      "A-S-Home"      },
    { "kHOM5",  "Ctrl-Home",           "C-Home"        },
    { "kHOM6",  "Ctrl-Shift-Home",     "C-S-Home"      },
    { "kHOM7",  "Alt-Ctrl-Home",       "A-C-Home"      },
    { "kEND3",  "Alt-End",             "A-End"         },
    { "kEND4",  "Alt-Shift-End",       "A-S-End"       },
    { "kEND5",  "Ctrl-End",            "C-End"         },
    { "kEND6",  "Ctrl-Shift-End",      "C-S-End"       },
    { "kEND7",  "Alt-Ctrl-End",        "A-C-End"       },
    { "kNXT3",  "Alt-PageDown",        "A-PageDown"    },
    { "kNXT4",  "Alt-Shift-PageDown",  "A-S-PageDown"  },
    { "kNXT5",  "Ctrl-PageDown",       "C-PageDown"    },
    { "kNXT6",  "Ctrl-Shift-PageDown", "C-S-PageDown"  },
    { "kNXT7",  "Alt-Ctrl-PageDown",   "A-C-PageDown"  },
    { "kPRV3",  "Alt-PageUp",          "A-PageUp"      },
    { "kPRV4",  "Alt-Shift-PageUp",    "A-S-PageUp"    },
    { "kPRV5",  "Ctrl-PageUp",         "C-PageUp"      },
    { "kPRV6",  "Ctrl-Shift-PageUp",   "C-S-PageUp"    },
    { "kPRV7",  "Alt-Ctrl-PageUp",     "A-C-PageUp"    }

[mckellyln]

First attempt at adding ncurses extended key support.
There are some interesting routines such as:
use_extended_names()
keyok()
keybound()
define_key()
key_defined()
which may be a better way to go, but either way the effort here is only because the option bind work comes before initscr() is called so at that moment we do not know the correct ncurses values for the extended keys.

[mckellyln]

I bind:

bind generic   <Ctrl-Down>  scroll-line-down
bind generic   <Ctrl-Up>    scroll-line-up

And for that to work nicely imho I also made some changes in another branch scroll_updates.
All my recent changes are in all_updates.

[mckellyln]

I'll look into a commit tomorrow that prints a warning at exit if a key used in a binding is not supported by the terminal.

[mckellyln]

Added exit print of warnings if binding an extended key that is not supported by terminfo.
Added as a second commit. I can squash if you want, just let me know.
@koutcher let me know if you find any of this helpful.
thx,
-m

[mckellygit]

We could add <C-*> and <A-*> entries also.

[mckellygit]

An easier way might be to just add -

    int i;
    for (i=KEY_MAX; i<2000; i++)
        keyok(i, false);

at the end of init_display(). And then use the explicit mappings:

bind generic   <Esc>[1;5B    scroll-line-down
bind generic   <Esc>[1;5A    scroll-line-up

What do you think ?

[mckellygit]

Added support for the abbreviated <C-*> and <A-*> bindings and made exit print to stderr

[mckellygit]

Alt (3) and Control (5) are supported here. We could also try to add these (if supported and not already mapped) -
``
4 - Shift + Alt
6 - Shift + Control
7 - Alt + Control

[mckellygit]

I've added support for the additional extended keys.
I'll also submit a PR for the opposite, disabling all extended keys so the explicit mappings work, and leave it at that.
thx again for tig,
-m

[mckellygit]

squashed commits

[Lenbok]

Would you expect that with this PR I could:

bind generic <Alt-V> move-page-up

and have it work?

[mckellyln]

Hi.
No, Alt-V is nothing special, what kind of system/terminal do you use ?
For most linux terminals, that should work as an Esc-V, so something like:

bind generic <Ctrl-[>v move-page-up

I dont know if you meant to type an upper-case 'V' or a lower-case 'v' ? My example above uses a lower-case 'v'. If you changed it to upper-case in the binding then it would be Alt+Shift+V pressed all at once.

[Lenbok]

Thanks - it looks like it's mostly a case of the binding syntax being a bit idiosyncratic / undescribed. I worked out the bindings I was trying to get, see: #131 (comment)

[mckellyln]

ok, sure.

<Esc>v
<Ctrl-[>v

are the same :-)

[mckellyln]

Closing for now.
Happy to re-work this as needed.
Note we can now use esc-codes to get this same functionality.
thx for tig,
-m