21.4.1 Basic Program Indentation Commands
Adjust indentation of current line.
Equivalent to <RET> followed by <TAB> (`newline-and-indent').
The basic indentation command is <TAB>, which gives the current line
the correct indentation as determined from the previous lines. The
function that <TAB> runs depends on the major mode; it is
`lisp-indent-line' in Lisp mode, `c-indent-line' in C mode, etc. These
functions understand different syntaxes for different languages, but
they all do about the same thing. <TAB> in any programming language
major mode inserts or deletes whitespace at the beginning of the
current line, independent of where point is in the line. If point is
inside the whitespace at the beginning of the line, <TAB> leaves it at
the end of that whitespace; otherwise, <TAB> leaves point fixed with
respect to the characters around it.
Use `C-q <TAB>' to insert a tab at point.
When entering a large amount of new code, use <LFD>
(`newline-and-indent'), which is equivalent to a <RET> followed by a
<TAB>. <LFD> creates a blank line, then gives it the appropriate
<TAB> indents the second and following lines of the body of a
parenthetical grouping each under the preceding one; therefore, if you
alter one line's indentation to be nonstandard, the lines below tend to
follow it. This is the right behavior in cases where the standard
result of <TAB> does not look good.
Remember that Emacs assumes that an open-parenthesis, open-brace, or
other opening delimiter at the left margin (including the indentation
routines) is the start of a function. You should therefore never have
an opening delimiter in column zero that is not the beginning of a
function, not even inside a string. This restriction is vital for
making the indentation commands fast. Note: Defuns, for more
information on this behavior.
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