History and Effective Use of Vim

Re:History and Effective Use of Vim by komali2 on Friday July 19, 2019 @04:09PM (#20482010)

On a lot of machines, C-[ (control + left bracket) maps to escape. But some programs don't seem to acknowledge this? Like in firefox, doing that changes tabs, but in Emacs + evil mode it's how I "ESC."

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Re:History and Effective Use of Vim by pault on Friday July 19, 2019 @07:10PM (#20483180)

There's an interesting reason for this related to the ASCII table and bit shifting, but I can't find a description of the exact mechanism for it. H and [ are in the same column as escape and delete respectively, and control shifts the bits in the character codes by some amount. Maybe someone smarter than me can elucidate.

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Re:History and Effective Use of Vim by mrcarrot on Saturday July 20, 2019 @10:33AM (#20485951)

This table might help explain:

          00  01  10  11
  00000   NUL Spc @   `
  00001   SOH !   A   a
  00010   STX "   B   b
  00011   ETX #   C   c
  00100   EOT $   D   d
  00101   ENQ %   E   e
  00110   ACK &   F   f
  00111   BEL '   G   g
  01000   BS  (   H   h
  01001   TAB )   I   i
  01010   LF  *   J   j
  01011   VT  +   K   k
  01100   FF  ,   L   l
  01101   CR  -   M   m
  01110   SO  .   N   n
  01111   SI  /   O   o
  10000   DLE 0   P   p
  10001   DC1 1   Q   q
  10010   DC2 2   R   r
  10011   DC3 3   S   s
  10100   DC4 4   T   t
  10101   NAK 5   U   u
  10110   SYN 6   V   v
  10111   ETB 7   W   w
  11000   CAN 8   X   x
  11001   EM  9   Y   y
  11010   SUB :   Z   z
  11011   ESC ;   [   {
  11100   FS  <   \   |
  11101   GS  =   ]   }
  11110   RS  >   ^   ~
  11111   US  ?   _   DEL

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Re:History and Effective Use of Vim by kps on Saturday July 20, 2019 @11:45AM (#20486418)

Now split the second column, and you understand the keyboard layout of pre-microprocessor ASCII terminals like the Teletype 33¹ and vi's own ADM-3A²

       011 010 
  0000  0   SP 
  0001  1   !  
  0010  2   "  
  0011  3   #  
  0100  4   $  
  0101  5   %  
  0110  6   &  
  0111  7   '  
  1000  8   (  
  1001  9   )  
  1010  :   *  
  1011  ;   +  
  1100  <   ,  
  1101  =   -  
  1110  >   .  
  1111  ?   /

¹ https://commons.wikimedia.org/wiki/File:TTY33ASR.jpg

² https://catonmat.net/images/why-vim-uses-hjkl/lsi-adm3a-full...

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Re:History and Effective Use of Vim by pault on Saturday July 20, 2019 @02:54PM (#20487613)

Right, I was trying to figure out what bitwise operation the control key performed specifically, but my google-fu was failing. Is it key ^ 0b10?

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