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In computer programming, indentation style is a convention, a.k.a. style, governing the indentation of blocks of source code.An indentation style generally involves consistent width of whitespace (indentation size) before each line of a block, so that the lines of code appear to be related, and dictates whether to use space or tab characters for the indentation whitespace.
indent is a Unix utility that reformats C and C++ code in a user-defined indentation style and coding style. Support for C++ code is minimal. [3] The original version of indent was written by David Willcox at the University of Illinois in November 1976. It was incorporated into 4.1BSD in October 1982. [4] GNU indent was first written by Jim ...
Being tightly integrated with the GNU system, GNU Emacs provides automatic formatting of C code to match the GNU coding standards. [1] Rather than manually modifying code formatting in a way that strays from the GNU coding standards, the formatted layout of the code can be tweaked by writing it in a more Emacs-friendly form—for example, by ...
Many open source projects have established rules for code layout. The most typical are the GNU formatting [8] and the BSD style. [9] The biggest difference between the two is the location of the braces: in the GNU style, opening and closing braces are on lines by themselves, with the same indent.
White space in code is typically stored as whitespace characters. For a free-form language, indentation is exclusively for the programmer since a code processor (i.e. compiler, interpreter) ignores whitespace characters. Code can have inconsistent or even no indentation, but in general is formatted with somewhat consistent indentation.
> The GNU Emacs text editor and the GNU systems' indent command will reformat code according to this style by default. [dubious – discuss] On Ubuntu 18.04, I tested indent (which is version 2.2.11).
The explicit structure of Lisp code allows automatic indenting, to form a visual cue for human readers. Another alternative is for each block to begin and end with explicit keywords. For example, in ALGOL 60 and its descendant Pascal , blocks start with keyword begin and end with keyword end .
Auto indentation: May refer to just simple indenting to the same level as the line above, or intelligent indenting that is language specific, e.g., ensuring a given indent style. Compiler integration : Allows running compilers/linkers/debuggers from within editor, capturing the compiler output and stepping through errors, automatically moving ...