buildrootschalter/docs/manual/writing-rules.txt
Thomas De Schampheleire 86a415df8a manual: use one-line titles instead of two-line titles (trivial)
Asciidoc supports two syntaxes for section titles: two-line titles (title
plus underline consisting of a particular symbol), and one-line titles
(title prefixed with a specific number of = signs).

The two-line title underlines are:
Level 0 (top level):     ======================
Level 1:                 ----------------------
Level 2:                 ~~~~~~~~~~~~~~~~~~~~~~
Level 3:                 ^^^^^^^^^^^^^^^^^^^^^^
Level 4 (bottom level):  ++++++++++++++++++++++

and the one-line title prefixes:
= Document Title (level 0) =
== Section title (level 1) ==

=== Section title (level 2) ===
==== Section title (level 3) ====
===== Section title (level 4) =====

The buildroot manual is currenly using the two-line titles, but this has
multiple disadvantages:

- asciidoc also uses some of the underline symbols for other purposes (like
  preformatted code, example blocks, ...), which makes it difficult to do
  mass replacements, such as a planned follow-up patch that needs to move
  all sections one level down.

- it is difficult to remember which level a given underline symbol (=-~^+)
  corresponds to, while counting = signs is easy.

This patch changes all two-level titles to one-level titles in the manual.
The bulk of the change was done with the following Python script, except for
the level 1 titles (-----) as these underlines are also used for literal
code blocks.
This patch only changes the titles, no other changes. In
adding-packages-directory.txt, I did add missing newlines between some
titles and their content.

----------------------------------------------------------------------------
#!/usr/bin/env python

import sys
import mmap
import re

for input in sys.argv[1:]:

    f = open(input, 'r+')
    f.flush()
    s = mmap.mmap(f.fileno(), 0)

    # Level 0 (top level):     ======================   =
    # Level 1:                 ----------------------   ==
    # Level 2:                 ~~~~~~~~~~~~~~~~~~~~~~   ===
    # Level 3:                 ^^^^^^^^^^^^^^^^^^^^^^   ====
    # Level 4 (bottom level):  ++++++++++++++++++++++   =====

    def replace_title(s, symbol, replacement):
        pattern = re.compile(r'(.+\n)\%s{2,}\n' % symbol, re.MULTILINE)
        return pattern.sub(r'%s \1' % replacement, s)

    new = s
    new = replace_title(new, '=', '=')
    new = replace_title(new, '+', '=====')
    new = replace_title(new, '^', '====')
    new = replace_title(new, '~', '===')
    #new = replace_title(new, '-', '==')

    s.seek(0)
    s.write(new)
    s.resize(s.tell())
    s.close()
    f.close()

----------------------------------------------------------------------------

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2014-05-02 10:27:59 +02:00

142 lines
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// -*- mode:doc; -*-
// vim: set syntax=asciidoc:
== Coding style
Overall, these coding style rules are here to help you to add new files in
Buildroot or refactor existing ones.
If you slightly modify some existing file, the important thing is
to keep the consistency of the whole file, so you can:
* either follow the potentially deprecated coding style used in this
file,
* or entirely rework it in order to make it comply with these rules.
[[writing-rules-config-in]]
=== +Config.in+ file
+Config.in+ files contain entries for almost anything configurable in
Buildroot.
An entry has the following pattern:
---------------------
config BR2_PACKAGE_LIBFOO
bool "libfoo"
depends on BR2_PACKAGE_LIBBAZ
select BR2_PACKAGE_LIBBAR
help
This is a comment that explains what libfoo is.
http://foosoftware.org/libfoo/
---------------------
* The +bool+, +depends on+, +select+ and +help+ lines are indented
with one tab.
* The help text itself should be indented with one tab and two
spaces.
The +Config.in+ files are the input for the configuration tool
used in Buildroot, which is the regular _Kconfig_. For further
details about the _Kconfig_ language, refer to
http://kernel.org/doc/Documentation/kbuild/kconfig-language.txt[].
[[writing-rules-mk]]
=== The +.mk+ file
* Header: The file starts with a header. It contains the module name,
preferably in lowercase, enclosed between separators made of 80 hashes. A
blank line is mandatory after the header:
+
---------------------
################################################################################
#
# libfoo
#
################################################################################
---------------------
+
* Assignment: use +=+ preceded and followed by one space:
+
---------------------
LIBFOO_VERSION = 1.0
LIBFOO_CONF_OPT += --without-python-support
---------------------
+
Do not align the +=+ signs.
* Indentation: use tab only:
+
---------------------
define LIBFOO_REMOVE_DOC
$(RM) -fr $(TARGET_DIR)/usr/share/libfoo/doc \
$(TARGET_DIR)/usr/share/man/man3/libfoo*
endef
---------------------
+
Note that commands inside a +define+ block should always start with a tab,
so _make_ recognizes them as commands.
* Optional dependency:
** Prefer multi-line syntax.
+
YES:
+
---------------------
ifeq ($(BR2_PACKAGE_PYTHON),y)
LIBFOO_CONF_OPT += --with-python-support
LIBFOO_DEPENDENCIES += python
else
LIBFOO_CONF_OPT += --without-python-support
endif
---------------------
+
NO:
+
---------------------
LIBFOO_CONF_OPT += --with$(if $(BR2_PACKAGE_PYTHON),,out)-python-support
LIBFOO_DEPENDENCIES += $(if $(BR2_PACKAGE_PYTHON),python,)
---------------------
** Keep configure options and dependencies close together.
* Optional hooks: keep hook definition and assignment together in one
if block.
+
YES:
+
---------------------
ifneq ($(BR2_LIBFOO_INSTALL_DATA),y)
define LIBFOO_REMOVE_DATA
$(RM) -fr $(TARGET_DIR)/usr/share/libfoo/data
endef
LIBFOO_POST_INSTALL_TARGET_HOOKS += LIBFOO_REMOVE_DATA
endif
---------------------
+
NO:
+
---------------------
define LIBFOO_REMOVE_DATA
$(RM) -fr $(TARGET_DIR)/usr/share/libfoo/data
endef
ifneq ($(BR2_LIBFOO_INSTALL_DATA),y)
LIBFOO_POST_INSTALL_TARGET_HOOKS += LIBFOO_REMOVE_DATA
endif
---------------------
=== The documentation
The documentation uses the
http://www.methods.co.nz/asciidoc/[asciidoc] format.
For further details about the http://www.methods.co.nz/asciidoc/[asciidoc]
syntax, refer to http://www.methods.co.nz/asciidoc/userguide.html[].