[PATCH] eng/coding-80cols: Convert wiki page to Rest

Sun Dec 2 03:09:41 UTC 2018

I pushed this. If you spot issues anywhere in the conversions, just submit
separate patches -- one per file.

I will be slow the next few days so make sure things get merged.

On Sat, Dec 1, 2018 at 11:14 AM Marçal Comajoan Cara <
mcomajoancara at gmail.com> wrote:

> Converted
> https://devel.rtems.org/wiki/Developer/Coding/80_characters_per_line
> to Rest, and TBDs into comments.
>
> This work was part of GCI 2018.
> ---
>  eng/coding-80cols.rst | 149 +++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 147 insertions(+), 2 deletions(-)
>
> diff --git a/eng/coding-80cols.rst b/eng/coding-80cols.rst
> index 442a9e0..48b2c65 100644
> --- a/eng/coding-80cols.rst
> +++ b/eng/coding-80cols.rst
> @@ -6,5 +6,150 @@
>  Eighty Character Line Limit
>  ***************************
>
> -TBD  - Convert the following to Rest and insert into this file
> -TBD -
> https://devel.rtems.org/wiki/Developer/Coding/80_characters_per_line
> +.. COMMENT: TBD - Convert the following to Rest and insert into this file
> +.. COMMENT: TBD -
> https://devel.rtems.org/wiki/Developer/Coding/80_characters_per_line
> +
> + Code should look good for everyone under some standard width assumptions.
> + Where a line wraps should be the same for anyone reading the code. For
> + historical reasons, RTEMS uses 80 characters as the maximum width for
> each
> + line of code.
> +
> +If you find yourself with code longer than 80 characters, first ask
> yourself
> +whether the nesting level is too deep, names too long, compound
> expressions too
> +complicated, or if some other guideline for improving readability can
> help to
> +shrink the line length. Refactoring nested blocks into functions can help
> to
> +alleviate code width problems while improving code readability. Making
> names
> +descriptive yet terse can also improve readability. If absolutely
> necessary
> +to have a long line, follow the rules on this page to break the line up
> to adhere
> +to the 80 characters per line rule.
> +
> +Breaking long lines
> +-------------------
> +
> +``if``, ``while``, and ``for`` loops have their condition expressions
> aligned
> +and broken on separate lines. When the conditions have to be broken, none
> go on
> +the first line with the ``if``, ``while``, or ``for`` statement, and none
> go on
> +the last line with the closing parenthesis and (optional) curly brace.
> Long
> +statements are broken up and indented at operators, with an operator
> always
> +being the last token on a line. No blank spaces should be left at the end
> of
> +any line. Here is an example with a ``for`` loop.
> +
> +.. code-block:: c
> +
> +  for ( initialization = statement; a + really + long + statement + that
> + evaluates + to < a + boolean; another + statement++ ) {
> +    z = a + really + long + statement + that + needs + two + lines + gets
> + indented + four + more + spaces + on + the + second + and + subsequent +
> lines + and + broken + up + at + operators;
> +  }
> +
> +Should be replaced with
> +
> +.. code-block:: c
> +
> +  for (
> +    initialization = statement;
> +    a + really + long + statement + that + evaluates + to <
> +    a + boolean;
> +    another + statement++
> +  ) {
> +    z = a + really + long + statement + that + needs +
> +        two + lines + gets + indented + four + more +
> +        spaces + on + the + second + and + subsequent +
> +        lines + and + broken + up + at + operators;
> +  }
> +
> +Note that indentations should add 2 nesting levels (4 space characters,
> not tabs).
> +
> +Similarly,
> +
> +.. code-block:: c
> +
> +  if ( this + that < those && this + these < that && this + those < these
> && this < those && those < that ) {
> +
> +should be broken up like
> +
> +.. code-block:: c
> +
> +  if (
> +    this + that < those &&
> +    this + these < that &&
> +    this + those < these &&
> +    this < those &&
> +    those < that
> +  ) {
> +
> +Note that each expression that resolves to a boolean goes on its own line.
> +Where you place the boolean operator is a matter of choice.
> +
> +When a line is long because of a comment at the end, move the comment to
> +just before the line, for example
> +
> +.. code-block:: c
> +
> +  #define A_LONG_MACRO_NAME (AND + EXPANSION) /* Plus + a + really + long
> + comment */
> +
> +can be replaced with
> +
> +.. code-block:: c
> +
> +  /* Plus + a + really + long + comment */
> +  #define A_LONG_MACRO_NAME (AND + EXPANSION)
> +
> +C Preprocessor macros need to be broken up with some care, because the
> +preprocessor does not understand that it should eat newline characters. So
> +
> +.. code-block:: c
> +
> +  #define A_LONG_MACRO_NAME (AND + EXCESSIVELY + LONG + EXPANSION + WITH
> + LOTS + OF + EXTRA + STUFF + DEFINED)
> +
> +would become
> +
> +.. code-block:: c
> +
> +  #define A_LONG_MACRO_NAME ( \
> +    AND + EXCESSIVELY + LONG + EXPANSION + WITH + LOTS + OF + EXTRA +
> STUFF + \
> +    DEFINED \
> +  )
> +
> +Notice that each line is terminated by a backslash then the carriage
> return.
> +The backslash tells the preprocessor to eat the newline. Of course, if
> you have
> +such a long macro, you should consider not using a macro.
> +
> +Function declarations can be broken up at each argument, for example
> +
> +.. code-block:: c
> +
> +  int this_is_a_function( int arg1, int arg2, int arg3, int arg4, int
> arg5, int arg6, int arg7, int arg8, int arg9 );
> +
> +would be broken up as
> +
> +.. code-block:: c
> +
> +  int this_is_a_function(
> +    int arg1,
> +    int arg2,
> +    int arg3,
> +    int arg4,
> +    int arg5,
> +    int arg6,
> +    int arg7,
> +    int arg8,
> +    int arg9
> +  );
> +
> +Excessively long comments should be broken up at a word boundary or
> somewhere
> +that makes sense, for example
> +
> +.. code-block:: c
> +
> +  /* Excessively long comments should be broken up at a word boundary or
> somewhere that makes sense, for example */
> +
> +would be
> +
> +.. code-block:: c
> +
> +  /* Excessively long comments should be broken up at a word boundary or
> +   * somewhere that makes sense, for example */
> +
> +Note that multiline comments have a single asterisk aligned with the
> asterisk
> +in the opening ``/*``. The closing ``*/`` should go at the end of the last
> +line.
> +
> --
> 2.17.1
>
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>
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