svn_opt.h

subversion-1.4.3-1.tar.gz 配置svn的源码

/**
 * @copyright
 * ====================================================================
 * Copyright (c) 2000-2004 CollabNet.  All rights reserved.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution.  The terms
 * are also available at http://subversion.tigris.org/license-1.html.
 * If newer versions of this license are posted there, you may use a
 * newer version instead, at your option.
 *
 * This software consists of voluntary contributions made by many
 * individuals.  For exact contribution history, see the revision
 * history and logs, available at http://subversion.tigris.org/.
 * ====================================================================
 * @endcopyright
 *
 * @file svn_opt.h
 * @brief Option and argument parsing for Subversion command lines
 */

#ifndef SVN_OPTS_H
#define SVN_OPTS_H

#include <apr.h>
#include <apr_pools.h>
#include <apr_getopt.h>

#include "svn_types.h"
#include "svn_error.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */



/**
 * All subcommand procedures in Subversion conform to this prototype.
 *
 * @a os is the apr option state after getopt processing has been run; in
 * other words, it still contains the non-option arguments following
 * the subcommand.  See @a os->argv and @a os->ind.
 *
 * @a baton is anything you need it to be.
 * 
 * @a pool is used for allocating errors, and for any other allocation
 * unless the instance is explicitly documented to allocate from a
 * pool in @a baton.
 */
typedef svn_error_t *(svn_opt_subcommand_t)
       (apr_getopt_t *os, void *baton, apr_pool_t *pool);


/** The maximum number of aliases a subcommand can have. */
#define SVN_OPT_MAX_ALIASES 3

/** The maximum number of options that can be accepted by a subcommand. */
#define SVN_OPT_MAX_OPTIONS 50

/** Options that have no short option char should use an identifying
 * integer equal to or greater than this.
 */
#define SVN_OPT_FIRST_LONGOPT_ID 256


/** One element of a subcommand dispatch table.
 *
 * @since New in 1.4.
 */
typedef struct svn_opt_subcommand_desc2_t
{
  /** The full name of this command. */
  const char *name;

  /** The function this command invokes. */
  svn_opt_subcommand_t *cmd_func;

  /** A list of alias names for this command (e.g., 'up' for 'update'). */
  const char *aliases[SVN_OPT_MAX_ALIASES];

  /** A brief string describing this command, for usage messages. */
  const char *help;

  /** A list of options accepted by this command.  Each value in the
   * array is a unique enum (the 2nd field in apr_getopt_option_t)
   */
  int valid_options[SVN_OPT_MAX_OPTIONS];

  /** A list of option help descriptions, keyed by the option unique enum
   * (the 2nd field in apr_getopt_option_t), which override the generic
   * descriptions given in an apr_getopt_option_t on a per-subcommand basis.
   */
  struct { int optch; const char *desc; } desc_overrides[SVN_OPT_MAX_OPTIONS];
} svn_opt_subcommand_desc2_t;


/** One element of a subcommand dispatch table.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 *
 * Like #svn_opt_subcommand_desc2_t but lacking the @c desc_overrides
 * member.
 */
typedef struct svn_opt_subcommand_desc_t
{
  /** The full name of this command. */
  const char *name;

  /** The function this command invokes. */
  svn_opt_subcommand_t *cmd_func;

  /** A list of alias names for this command (e.g., 'up' for 'update'). */
  const char *aliases[SVN_OPT_MAX_ALIASES];

  /** A brief string describing this command, for usage messages. */
  const char *help;

  /** A list of options accepted by this command.  Each value in the
   * array is a unique enum (the 2nd field in apr_getopt_option_t)
   */
  int valid_options[SVN_OPT_MAX_OPTIONS];

} svn_opt_subcommand_desc_t;


/**
 * Return the entry in @a table whose name matches @a cmd_name, or @c NULL if 
 * none.  @a cmd_name may be an alias.
 *
 * @since New in 1.4.
 */  
const svn_opt_subcommand_desc2_t *
svn_opt_get_canonical_subcommand2(const svn_opt_subcommand_desc2_t *table,
                                  const char *cmd_name);


/**
 * Return the entry in @a table whose name matches @a cmd_name, or @c NULL if 
 * none.  @a cmd_name may be an alias.
 *
 * Same as svn_opt_get_canonical_subcommand2(), but acts on
 * #svn_opt_subcommand_desc_t.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 */  
const svn_opt_subcommand_desc_t *
svn_opt_get_canonical_subcommand(const svn_opt_subcommand_desc_t *table,
                                 const char *cmd_name);


/**
 * Return pointer to an @c apr_getopt_option_t for the option whose 
 * option code is @a code, or @c NULL if no match.  @a option_table must end
 * with an element whose every field is zero.  If @c command is non-NULL,
 * then the subcommand-specific option description instead of the generic one,
 * if a specific description is defined.
 *
 * The returned value may be statically allocated, or allocated in @a pool.
 *
 * @since New in 1.4.
 */
const apr_getopt_option_t *
svn_opt_get_option_from_code2(int code,
                              const apr_getopt_option_t *option_table,
                              const svn_opt_subcommand_desc2_t *command,
                              apr_pool_t *pool);


/**
 * Return the first entry from @a option_table whose option code is @a code,
 * or @c NULL if no match.  @a option_table must end with an element whose
 * every field is zero.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 */
const apr_getopt_option_t *
svn_opt_get_option_from_code(int code,
                             const apr_getopt_option_t *option_table);


/**
 * Return @c TRUE iff subcommand @a command supports option @a option_code,
 * else return @c FALSE.
 *
 * @since New in 1.4.
 */
svn_boolean_t
svn_opt_subcommand_takes_option2(const svn_opt_subcommand_desc2_t *command,
                                 int option_code);


/**
 * Return @c TRUE iff subcommand @a command supports option @a option_code,
 * else return @c FALSE.
 *
 * Same as svn_opt_subcommand_takes_option2(), but acts on
 * #svn_opt_subcommand_desc_t.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 */
svn_boolean_t
svn_opt_subcommand_takes_option(const svn_opt_subcommand_desc_t *command,
                                int option_code);


/**
 * Print a generic (not command-specific) usage message to @a stream.
 *
 * (### todo: why is @a stream a stdio file instead of an svn stream?)
 *
 * If @a header is non-null, print @a header followed by a newline.  Then
 * loop over @a cmd_table printing the usage for each command (getting
 * option usages from @a opt_table).  Then if @a footer is non-null, print
 * @a footer followed by a newline.
 *
 * Use @a pool for temporary allocation.
 *
 * @since New in 1.4.
 */
void
svn_opt_print_generic_help2(const char *header,
                            const svn_opt_subcommand_desc2_t *cmd_table,
                            const apr_getopt_option_t *opt_table,
                            const char *footer,
                            apr_pool_t *pool,
                            FILE *stream);


/* Same as svn_opt_print_generic_help2(), but acts on
 * #svn_opt_subcommand_desc_t.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 */
void
svn_opt_print_generic_help(const char *header,
                           const svn_opt_subcommand_desc_t *cmd_table,
                           const apr_getopt_option_t *opt_table,
                           const char *footer,
                           apr_pool_t *pool,
                           FILE *stream);


/**
 * Print an option @a opt nicely into a @a string allocated in @a pool.  
 * If @a doc is set, include the generic documentation string of @a opt,
 * localized to the current locale if a translation is available.
 */
void
svn_opt_format_option(const char **string,
                      const apr_getopt_option_t *opt,
                      svn_boolean_t doc,
                      apr_pool_t *pool);



/**
 * Get @a subcommand's usage from @a table, and print it to @c stdout.  
 * Obtain option usage from @a options_table.  Use @a pool for temporary
 * allocation.  @a subcommand may be a canonical command name or an
 * alias.  (### todo: why does this only print to @c stdout, whereas
 * svn_opt_print_generic_help() gives us a choice?)
 *
 * @since New in 1.4.
 */
void
svn_opt_subcommand_help2(const char *subcommand, 
                         const svn_opt_subcommand_desc2_t *table,
                         const apr_getopt_option_t *options_table,
                         apr_pool_t *pool);


/**
 * Same as svn_opt_subcommand_help2(), but acts on
 * #svn_opt_subcommand_desc_t.
 *
 * @deprecated Provided for backward compatibility with the 1.3 API.
 */
void