vim 配置文件加载顺序笔记

最新代码：git clone https://github.com/vim/vim.git
1. VIM执行入口 src/main.c，source_startup_scripts()执行初始化。

    /*

     * Try to read initialization commands from the following places:

     * - environment variable VIMINIT

     * - user vimrc file (s:.vimrc for Amiga, ~/.vimrc otherwise)

     * - second user vimrc file ($VIM/.vimrc for Dos)

     * - environment variable EXINIT

     * - user exrc file (s:.exrc for Amiga, ~/.exrc otherwise)

     * - second user exrc file ($VIM/.exrc for Dos)

     * The first that exists is used, the rest is ignored.

     */

    if (process_env((char_u *)"VIMINIT", TRUE) != OK)

    {

        if (do_source((char_u *)USR_VIMRC_FILE, TRUE, DOSO_VIMRC) == FAIL

#ifdef USR_VIMRC_FILE2

        && do_source((char_u *)USR_VIMRC_FILE2, TRUE,

                               DOSO_VIMRC) == FAIL

#endif

#ifdef USR_VIMRC_FILE3

        && do_source((char_u *)USR_VIMRC_FILE3, TRUE,

                               DOSO_VIMRC) == FAIL

#endif

#ifdef USR_VIMRC_FILE4

        && do_source((char_u *)USR_VIMRC_FILE4, TRUE,

                               DOSO_VIMRC) == FAIL

#endif

        && process_env((char_u *)"EXINIT", FALSE) == FAIL

        && do_source((char_u *)USR_EXRC_FILE, FALSE, DOSO_NONE) == FAIL

#ifdef USR_EXRC_FILE2

        && do_source((char_u *)USR_EXRC_FILE2, FALSE, DOSO_NONE) == FAIL

#endif

        && !has_dash_c_arg)

        {

        /* When no .vimrc file was found: source defaults.vim. */

        do_source((char_u *)VIM_DEFAULTS_FILE, FALSE, DOSO_NONE);

        }

    }

2. Autoload

/*

 * Return the autoload script name for a function or variable name.

 * Returns NULL when out of memory.

 */

    char_u *

autoload_name(char_u *name)

{

    char_u    *p;

    char_u    *scriptname;

    /* Get the script file name: replace '#' with '/', append ".vim". */

    scriptname = alloc((unsigned)(STRLEN(name) + 14));

    if (scriptname == NULL)

    return FALSE;

    STRCPY(scriptname, "autoload/");

    STRCAT(scriptname, name);

    *vim_strrchr(scriptname, AUTOLOAD_CHAR) = NUL;

    STRCAT(scriptname, ".vim");

    while ((p = vim_strchr(scriptname, AUTOLOAD_CHAR)) != NULL)

    *p = '/';

    return scriptname;

}

3. 参考starting.txt文档，help initialization 或者 help startup。