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Pacman - Contributing
=====================
This file is meant to give you a brief overview of coding style and other
concerns when hacking on pacman. If you are interested in contributing, please
read link:submitting-patches.html[submitting-patches] and
link:translation-help.html[translation-help] as well.
Coding Style
------------
1. All code should be indented with tabs. (Ignore the use of only spaces in
this file.) A tab size of two spaces is used when calculating line widths,
which should be a maximum of 80 characters. An EditorConfig file is used
to set this project-wide default.
2. When opening new blocks such as 'while', 'if', or 'for', leave the opening
brace on the same line as the beginning of the codeblock. The closing brace
gets its own line (the only exception being 'else'). Do not use extra
spaces around the parentheses of the block. ALWAYS use opening and closing
braces, even if it's just a one-line block. This reduces future error when
blocks are expanded beyond one line.
+
[source,C]
-------------------------------------------
for(lp = list; lp; lp = lp->next) {
newlist = _alpm_list_add(newlist, strdup(lp->data));
}
while(it) {
ptr = it->next;
if(fn) {
fn(it->data);
} else {
return 1;
}
free(it);
it = ptr;
}
-------------------------------------------
3. When declaring a new function, put the opening and closing braces on their
own line. Also, when declaring a pointer, do not put a space between the
asterisk and the variable name.
+
[source,C]
-------------------------------------------
alpm_list_t *alpm_list_add(alpm_list_t *list, void *data)
{
alpm_list_t *ptr, *lp;
ptr = list;
if(ptr == NULL) {
...
}
...
}
-------------------------------------------
4. Comments should be ANSI-C89 compliant. That means no `// Comment` style;
use only `/* Comment */` style.
/* This is a comment */
NOT
// This is a comment
5. Return statements should *not* be written like function calls.
return 0;
NOT
return(0);
6. When using strcmp() (or any function that returns 0 on success) in a
conditional statement, use != 0 or == 0 and not the negation (!) operator.
It reads much cleaner for humans (using a negative to check for success is
confusing) and the compiler will treat it correctly anyway.
if(strcmp(a, b) == 0)
NOT
if(!strcmp(a, b))
7. Use spaces around almost all arithmetic, comparison and assignment
operators and after all ',;:' separators.
foobar[2 * size + 1] = function(a, 6);
NOT
foobar[2*size+1]=function(a,6);
for(a = 0; a < n && n > 0; a++, n--) {}
NOT
for(a=0;a<n&&n>0;a++,n--) {}
8. Declare all variables at the start of the block.
[source,C]
-------------------------------------------
int SYMEXPORT alpm_db_remove_server(alpm_db_t *db, const char *url)
{
char *newurl, *vdata = NULL;
newurl = url;
if(!newurl) {
return -1;
}
...
if(vdata) {
...
}
return 1;
}
-------------------------------------------
NOT
[source,C]
-------------------------------------------
int SYMEXPORT alpm_db_remove_server(alpm_db_t *db, const char *url)
{
char *newurl = url;
if(!newurl) {
return -1;
}
char *vdata = NULL;
if(vdata) {
...
}
return 1;
}
-------------------------------------------
Other Concerns
--------------
Header Includes
~~~~~~~~~~~~~~~
Currently our #include usage is in messy shape, but this is no reason to
continue down this messy path. When adding an include to a file, follow this
general pattern, including blank lines:
[source,C]
-------------------------------------------
#include <standardheader.h>
#include <another.h>
#include <...>
-------------------------------------------
Follow this with some more headers, depending on whether the file is in libalpm
or pacman proper. For libalpm:
[source,C]
-------------------------------------------
/* libalpm */
#include "yourfile.h"
#include "alpm_list.h"
#include "anythingelse.h"
-------------------------------------------
For pacman:
[source,C]
-------------------------------------------
#include <alpm.h>
#include <alpm_list.h>
/* pacman */
#include "yourfile.h"
#include "anythingelse.h"
-------------------------------------------
Never directly include config.h. This will always be added via Makefiles.
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