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30
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1 Q: Options menu is ugly under Emacs 19
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2 A: Wait for 19.35 - this is because of a 'feature lack' in easymenu.el
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3
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118
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4 Q: Animated GIFs cause XEmacs 19.14 or 20.0 to crash
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5 A: There was a bug in the GIF decoding routines in XEmacs 19.14 - please
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6 upgrade to XEmacs 19.15 or later.
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7
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30
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8 Q: I get an error when starting up:
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118
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9 Symbol's function definition is void: custom-declare-group
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30
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10 A: This usually means you compiled W3 in an emacs that could not find
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11 the 'custom' package (or found an old version), but are running W3
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12 in an emacs that find the new one. This is usually the case if you
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13 have a recent version of GNUS installed in a non-standard place.
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14
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15 Make sure that you can load the custom library when compiling
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16 emacs. Set the environment variable WIDGETDIR to where your custom
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17 library lives (ie: ~/lisp/gnus/lisp)
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118
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18
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19 Courtesy of greg stark <gsstark@mit.edu>
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20 Q: How do i get Shift-Tab to go backwards on a text terminal or XTerm?
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21 aka: I hate the new text widgets, I can't go through the links with n and b
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22 I can go forward using TAB but how do i go backward on a terminal?
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23
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24 A: Not all terminals can distinguish between a shifted tab and an unshifted
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25 tab at all. Tab is indicated on a text terminal by a control-i. There is no
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26 such thing as capital control characters, so if the terminal is going to
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27 indicate a shift-tab somehow it has to be completely differently. The most
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28 appropriate thing to use is probably "backtab" which on old text terminals was
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29 sometimes a separate key and Emacs is already set up to recognize
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30 automatically if it exists.
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31
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32 Making "backtab" work involves several steps. First you have to make sure your
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33 console generates some character sequence to indicate the key you want to
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34 generate a "backtab". Then you have to configure termcap or terminfo to
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35 recognize that key sequence. Then you may have to make your programs do useful
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36 things when they get a "backtab", Emacs for example will recognize it
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37 automatically but except for the Widget and W3 commands nothing is ever bound
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122
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38 it it.
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39
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40 Step 1 On An XTerm: XTerm obeys standard X Toolkit translations which you can
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41 use to specify what character sequence Shift-Tab generates. The following X
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42 Resources will cause Shift-Tab and Meta-Shift-Tab to generate reasonable
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43 character sequences. You can either put this in your .Xresources or .Xdefaults
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44 file, or you can put it in /usr/lib/X11/app-defaults/XTerm to make it a
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45 site-wide default. (On Debian systems you should put it in
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46 /etc/X11/Xresources, not the app-defaults files):
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47
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48 XTerm*VT100.translations: #override \
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49 ~Meta Shift<Key>Tab: string(\033[Z) \n\
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50 Meta Shift<Key>Tab: string(\033\033[Z) \n
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51
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52 I recommend these sequences, they are based on what seems to be a more or less
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53 standard sequence ^[[Z for backtab.
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54
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55 Step 1 On Rxvt: By default Rxvt sends ^[[Z for Shift-Tab.
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56 However, if Shift-Tab generates another keysym, like for example in XFree86
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57 3.2 where it's bound to ISO_Left_Tab then Rxvt will just ignore it. You would
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58 need to defeat this feature to make rxvt work again by doing something like:
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59
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60 xmodmap -e 'keysym Tab = Tab'
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61
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62 or adding that command to some global X configuration file (On Debian systems
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122
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63 adding ``Keysym Tab = Tab'' to /etc/X11/Xmodmap or ~/.Xmodmap is sufficient)
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118
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64
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65 Step 1 On A Linux Virtual Console: on a Linux virtual console you can
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66 configure what character sequences are generated by which keys using the
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67 loadkeys command. Many systems are set up to run loadkeys automatically on
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68 startup with some keymap file. On Debian systems this is true, the keymap file
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69 is specified in /etc/kbd/config and usually lives in the
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70 /usr/lib/kbd/keytables directory. You want to put something like the following
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71 in your keytable file:
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72
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73 keycode 15 = Tab F91
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74 alt keycode 15 = Meta_Tab
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75 shift alt keycode 15 = F92
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76
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77 where keycode 15 is Tab on my keyboard (and probably any keyboard). This
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78 defines Tab and Alt-Tab normally, and also defines Shift-Tab to be F91 and
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79 Shift-Alt-Tab to be F92.
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80
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81 Then put something like this:
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82 # backtab and M-backtab
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83 string F91 = "\033[Z"
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84 string F92 = "\033\033[Z"
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85
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86 later in the file. This defines what character sequence F91 (Shift-Tab) and
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87 F92 (Alt-Shift-Tab) should generate. I recommend these sequences, they are
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88 based on what seems to be a more or less standard sequence ^[[Z for backtab.
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89
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90 Step 2 On A Termcap System:
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91
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92 The termcap capability is kB, i'm not familiar with termcap tools, i think you
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93 just need to add it to the /etc/termcap file for the terminal you're concerned
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94 with as kB=\E[Z.
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95
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96 Step 2 On A Terminfo System:
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97
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98 The terminfo capability is kcbt (the long name is key_btab). You want to run
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99 infocmp to generate an edittable copy of the terminal info. Add the
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100 capability, then use tic to compile that information. Something like this:
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101
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102 infocmp $TERM > info
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103 emacs info & # add kcbt=\E[Z, to the file
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104 tic info
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105
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106 If you do this as root it should add the new definition to the system wide
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107 terminfo database. If you do it as a normal user it should create a
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108 ~/.terminfo database with a local terminfo info definition for that terminal.
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109
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110 Step 3 On Emacs:
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111
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112 The standard terminal initialization should recognize the backtab capability
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113 automatically. To test it try C-h c Shift-Tab and see what it calls the key.
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114 To bind commands to it just use [backtab] in local-set-key or global-set-key
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115 as in:
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116
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117 (local-set-key [backtab] 'hippie-expand)
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118 or
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119 (global-set-key [backtab] 'hippie-expand)
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120
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121 In the interest of maintaining a single consistent set of key bindings between
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122 X and tty emacsen you may want to make equivalent X keystroke generate
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123 "backtab" as well, you can do this by doing this:
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124
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125 (define-key function-key-map [S-tab] [backtab])
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126 or
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127 (define-key function-key-map [iso-lefttab] [backtab])
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128
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129 To make S-tab or whatever keystroke you made generate backtab on a terminal
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130 be recognized as backtab under X11 as well. You can check how Emacs recognizes
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131 this keystroke currently by doing C-h c <keystroke>.
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132
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133
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