* Moved the coding conventions from maintainers/docs to the Nixpkgs
manual. * Removed some out-dated files from maintainers/docs. svn path=/nixpkgs/trunk/; revision=17419
This commit is contained in:
Eelco Dolstra
parent
24da0cbad8
commit
bfb4a0ccc8
175
doc/coding-conventions.xml
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175
doc/coding-conventions.xml
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="chap-conventions">
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<title>Coding conventions</title>
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<section><title>Syntax</title>
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<itemizedlist>
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<listitem><para>Use 2 spaces of indentation per indentation level in
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Nix expressions, 4 spaces in shell scripts.</para></listitem>
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<listitem><para>Do not use tab characters, i.e. configure your
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editor to use soft tabs. For instance, use <literal>(setq-default
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indent-tabs-mode nil)</literal> in Emacs. Everybody has different
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tab settings so it’s asking for trouble.</para></listitem>
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<listitem><para>Use <literal>lowerCamelCase</literal> for variable
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names, not <literal>UpperCamelCase</literal>. TODO: naming of
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attributes in
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<filename>all-packages.nix</filename>?</para></listitem>
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<listitem><para>Function calls with attribute set arguments are
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written as
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<programlisting>
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foo {
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arg = ...;
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}
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</programlisting>
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not
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<programlisting>
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foo
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{
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arg = ...;
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}
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</programlisting>
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Also fine is
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<programlisting>
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foo { arg = ...; }
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</programlisting>
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if it's a short call.</para></listitem>
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<listitem><para>In attribute sets or lists that span multiple lines,
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the attribute names or list elements should be aligned:
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<programlisting>
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# A long list.
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list =
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[ elem1
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elem2
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elem3
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];
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# A long attribute set.
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attrs =
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{ attr1 = short_expr;
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attr2 =
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if true then big_expr else big_expr;
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};
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# Alternatively:
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attrs = {
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attr1 = short_expr;
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attr2 =
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if true then big_expr else big_expr;
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};
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</programlisting>
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</para></listitem>
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<listitem><para>Short lists or attribute sets can be written on one
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line:
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<programlisting>
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# A short list.
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list = [ elem1 elem2 elem3 ];
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# A short set.
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attrs = { x = 1280; y = 1024; };
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</programlisting>
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</para></listitem>
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<listitem><para>Breaking in the middle of a function argument can
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give hard-to-read code, like
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<programlisting>
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someFunction { x = 1280;
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y = 1024; } otherArg
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yetAnotherArg
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</programlisting>
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(especially if the argument is very large, spanning multiple
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lines).</para>
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<para>Better:
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<programlisting>
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someFunction
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{ x = 1280; y = 1024; }
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otherArg
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yetAnotherArg
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</programlisting>
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or
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<programlisting>
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let res = { x = 1280; y = 1024; };
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in someFunction res otherArg yetAnotherArg
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</programlisting>
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</para></listitem>
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<listitem><para>The bodies of functions, asserts, and withs are not
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indented to prevent a lot of superfluous indentation levels, i.e.
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<programlisting>
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{ arg1, arg2 }:
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assert system == "i686-linux";
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stdenv.mkDerivation { ...
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</programlisting>
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not
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<programlisting>
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{ arg1, arg2 }:
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assert system == "i686-linux";
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stdenv.mkDerivation { ...
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</programlisting>
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</para></listitem>
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<listitem><para>Function formal arguments are written as:
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<programlisting>
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{ arg1, arg2, arg3 }:
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</programlisting>
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but if they don't fit on one line they're written as:
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<programlisting>
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{ arg1, arg2, arg3
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, arg4, ...
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, # Some comment...
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argN
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}:
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</programlisting>
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</para></listitem>
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</itemizedlist>
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</section>
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<section><title>File naming and organisation</title>
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<para>Names of files and directories should be in lowercase, with
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dashes between words — not in camel case. For instance, it should be
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<filename>all-packages.nix</filename>, not
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<filename>allPackages.nix</filename> or
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<filename>AllPackages.nix</filename>.</para>
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</section>
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</chapter>
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@ -33,6 +33,7 @@
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<xi:include href="meta.xml" />
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<xi:include href="language-support.xml" />
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<xi:include href="package-notes.xml" />
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<xi:include href="coding-conventions.xml" />
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</book>
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@ -1,49 +0,0 @@
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*** All these bugs should be moved to JIRA (if they still exist) ***
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* If NIX_DEBUG is turned on (set to "1"), autoconf configure scripts
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may fail to find the correct preprocessor:
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checking how to run the C preprocessor... /lib/cpp
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* When building gcc using a Nix gcc, generated libraries link against
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the libraries of the latter:
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$ ldd /nix/store/3b1d3995c4edbf026be5c73f66f69245-gcc-3.3.3/lib/libstdc++.so
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...
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libgcc_s.so.1 => /nix/store/1f19e61d1b7051f1131f78b41b2a0e7e-gcc-3.3.2/lib/libgcc_s.so.1 (0x400de000)
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(wrong! should be .../3b1d.../lib/libgcc_s...)
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...
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* In libXt:
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/bin/sh ./libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I. -DXTHREADS -DXUSE_MTSAFE_API -I/nix/store/aadf0bd4a908da11d14f6538503b8408-libX11-6.2.1/include -I/nix/store/ba366e3b944ead64ec9b0490bb615874-xproto-6.6.1/include -I./include/X11 -g -O2 -c -o ActionHook.lo `test -f 'ActionHook.c' || echo './'`ActionHook.c
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mkdir .libs
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gcc -DHAVE_CONFIG_H -I. -I. -I. -DXTHREADS -DXUSE_MTSAFE_API -I/nix/store/aadf0bd4a908da11d14f6538503b8408-libX11-6.2.1/include -I/nix/store/ba366e3b944ead64ec9b0490bb615874-xproto-6.6.1/include -I./include/X11 -g -O2 -c ActionHook.c -fPIC -DPIC -o .libs/ActionHook.o
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In file included from IntrinsicI.h:55,
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from ActionHook.c:69:
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include/X11/IntrinsicP.h:54:27: X11/Intrinsic.h: No such file or directory
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* Then:
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gcc -DHAVE_CONFIG_H -I. -I. -I. -DXTHREADS -DXUSE_MTSAFE_API -I/nix/store/aadf0bd4a908da11d14f6538503b8408-libX11-6.2.1/include -I/nix/store/ba366e3b944ead64ec9b0490bb615874-xproto-6.6.1/include -I./include -I./include/X11 -g -O2 -c ActionHook.c -fPIC -DPIC -o .libs/ActionHook.o
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In file included from IntrinsicI.h:55,
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from ActionHook.c:69:
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include/X11/IntrinsicP.h:202:25: X11/ObjectP.h: No such file or directory
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(moved to include/X11; should edit include/Makefile.am)
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* In gtksourceview-sharp: does the prefix patch cause problems (e.g.,
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makefile.am says "mimeinfodir should be the same as the gnome
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prefix")?
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* fgrep/egrep: these fail if grep is not in the $PATH.
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* teTeX: some programs (such as epstopdf) depend on /usr/bin/env, and
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expect perl to be in the environment.
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@ -1,101 +0,0 @@
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Some conventions:
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* Directories / file names: lowercase, and use dashes between words,
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no camel case. I.e., all-packages.nix, not all allPackages.nix or
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AllPackages.nix.
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* Don't use TABs. Everybody has different TAB settings so it's asking
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for trouble.
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* Use 2 spaces of indentation per indentation level in Nix
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expressions, 4 spaces in shell scripts. (Maybe 2 is too low, but
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for consistency's sake it should be the same. Certainly indentation
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should be consistent within a single file.)
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* Use lowerCamelCase for variable names, not UpperCamelCase.
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* Function calls with attribute set arguments are written as
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foo {
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arg = ...;
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}
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not
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foo
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{
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arg = ...;
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}
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Also fine is
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foo { arg = ...; }
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if it's a short call.
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* In attribute sets or lists that span multiple lines, the attribute
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names or list elements should be aligned:
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# A long list.
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list = [
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elem1
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elem2
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elem3
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];
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# A long attribute set.
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attrs = {
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attr1 = short_expr;
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attr2 =
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if true then big_expr else big_expr;
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};
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* Short lists or attribute sets can be written on one line:
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# A short list.
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list = [ elem1 elem2 elem3 ];
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# A short set.
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attrs = { x = 1280; y = 1024; };
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* Breaking in the middle of a function argument can give hard-to-read
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code, like
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someFunction { x = 1280;
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y = 1024; } otherArg
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yetAnotherArg
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(especially if the argument is very large, spanning multiple lines).
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Better:
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someFunction
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{ x = 1280; y = 1024; }
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otherArg
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yetAnotherArg
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or
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let res = { x = 1280; y = 1024; };
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in someFunction res otherArg yetAnotherArg
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* The bodies of functions, asserts, and withs are not indented, so
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assert system == "i686-linux";
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stdenv.mkDerivation { ...
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not
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assert system == "i686-linux";
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stdenv.mkDerivation { ...
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* Function formal arguments are written as:
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{arg1, arg2, arg3}:
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but if they don't fit on one line they're written as:
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{ arg1, arg2, arg3
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, arg4, ...
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, argN
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}:
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@ -1,31 +0,0 @@
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Creating a new static stdenv
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----------------------------
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When Nix is ported to a new (Linux) platform and you want to have a completely
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pure setup for the stdenv (for example for NixOS) it is necessary to rebuild
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the static tools.
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The challenge is that there is no Nix environment yet, for bootstrapping.
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The first task is to create all the tools that are necessary. For most tools
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there are ready made Nix expressions.
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GCC
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There is an expression gcc-static-3.4. Depending on whether or not you already
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have an environment built with Nix (x86-linux: yes, rest: not yet) you should
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set the noSysDirs parameter in all-packages.nix. If there is an environment,
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leave it, but if the system is still impure (like most systems), set noSysDirs
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to false.
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bash
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There is an expression for bash-static. Simply build it.
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bzip2
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There is an expression for bzip2-static. Simply build it.
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findutils
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There is an expression for findutils-static. Simply build it.
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@ -1,35 +0,0 @@
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Upgrading the standard initial environment
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For Nix on i686-linux we make use of an environment of statically linked
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tools (see $nixpkgs/stdenv/linux). The first version of these tools were
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compiled outside of Nix, in an impure environment. They are used as some
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magical ingredient to make everything work. To keep these tools more in
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synchronization with the rest of nixpkgs and to make porting of nixpkgs
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to other platforms easier the static versions are now also built with Nix
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and nixpkgs.
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The tools can be found in nixpkgs in:
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- shells/bash-static
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- tools/networking/curl-diet
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- tools/archivers/gnutar-diet
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- tools/compression/gzip-diet
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- tools/compression/bzip2-static
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- tools/text/gnused-diet
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- tools/text/diffutils-diet
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- tools/text/gnupatch-diet
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- tools/misc/findutils-static
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and
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- development/compilers/gcc-static-3.4
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Most packages are compiled with dietlibc, an alternate C library, apart
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from bash and findutils, which are statically linked to glibc. The reason
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we chose dietlibc has various reasons. First of all, curl cannot be built
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statically with glibc. If we do, we get a static binary, but it cannot resolve
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hostnames to IP addresses. glibc dynamically loads functionality at runtime
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to do resolving. When linking with dietlibc this doesn't happen.
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The static tools are not used as part of the input hashing (see Eelco's
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PhD thesis, paragraph 5.4.1), so changing them does not change anything and
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will not force a massive rebuild.
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@ -1,12 +0,0 @@
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* Patch development/tools/misc/libtool not to search standard
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directories for libraries (like setup.sh does now). [do we want
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this?]
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* Inform freedesktop people that Xaw requires Xpm.
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* After building gcc, filter out references to /tmp/nix... in
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.../lib/libsupc++.la and .../lib/libstdc++.la
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* Add gettext to glib propagatedBuildInputs? Glib's `gi18n.h' doesn't
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seem to like Glibc `libintl.h'; needs the gettext one instead.
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[Move from libbonoboui]
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Block a user