(emacs)Tabs in Picture
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Picture Mode Tabs
Two kinds of tab-like action are provided in Picture mode. Use
`M-TAB' (`picture-tab-search') for context-based tabbing. With no
argument, it moves to a point underneath the next "interesting"
character that follows whitespace in the previous nonblank line.
"Next" here means "appearing at a horizontal position greater than the
one point starts out at". With an argument, as in `C-u M-TAB', this
command moves to the next such interesting character in the current
line. `M-TAB' does not change the text; it only moves point.
"Interesting" characters are defined by the variable
`picture-tab-chars', which contains a string whose characters are all
considered interesting. Its default value is `"!-~"'.
TAB itself runs `picture-tab', which operates based on the current
tab stop settings; it is the Picture mode equivalent of
`tab-to-tab-stop'. Normally it just moves point, but with a numeric
argument it clears the text that it moves over.
The context-based and tab-stop-based forms of tabbing are brought
together by the command `C-c TAB', `picture-set-tab-stops'. This
command sets the tab stops to the positions which `M-TAB' would
consider significant in the current line. The use of this command,
together with TAB, can get the effect of context-based tabbing. But
`M-TAB' is more convenient in the cases where it is sufficient.
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