| Junio C Hamano | e0238c2 | 2012-02-23 22:45:50 | [diff] [blame] | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" |
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| 505 | * http://www.brandspankingnew.net/archive/2005/07/format_footnote.html |
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| 549 | /*]]>*/ |
| 550 | </script> |
| 551 | </head> |
| 552 | <body> |
| 553 | <div id="header"> |
| 554 | <h1>config API</h1> |
| 555 | </div> |
| 556 | <div id="content"> |
| 557 | <div id="preamble"> |
| 558 | <div class="sectionbody"> |
| 559 | <div class="paragraph"><p>The config API gives callers a way to access git configuration files |
| Junio C Hamano | 022bd34 | 2012-06-07 20:15:35 | [diff] [blame^] | 560 | (and files which have the same syntax). See <a href="../git-config.html">../git-config(1)</a> for a |
| Junio C Hamano | e0238c2 | 2012-02-23 22:45:50 | [diff] [blame] | 561 | discussion of the config file syntax.</p></div> |
| 562 | </div> |
| 563 | </div> |
| 564 | <h2 id="_general_usage">General Usage</h2> |
| 565 | <div class="sectionbody"> |
| 566 | <div class="paragraph"><p>Config files are parsed linearly, and each variable found is passed to a |
| 567 | caller-provided callback function. The callback function is responsible |
| 568 | for any actions to be taken on the config option, and is free to ignore |
| 569 | some options. It is not uncommon for the configuration to be parsed |
| 570 | several times during the run of a git program, with different callbacks |
| 571 | picking out different variables useful to themselves.</p></div> |
| 572 | <div class="paragraph"><p>A config callback function takes three parameters:</p></div> |
| 573 | <div class="ulist"><ul> |
| 574 | <li> |
| 575 | <p> |
| 576 | the name of the parsed variable. This is in canonical "flat" form: the |
| 577 | section, subsection, and variable segments will be separated by dots, |
| 578 | and the section and variable segments will be all lowercase. E.g., |
| 579 | <tt>core.ignorecase</tt>, <tt>diff.SomeType.textconv</tt>. |
| 580 | </p> |
| 581 | </li> |
| 582 | <li> |
| 583 | <p> |
| 584 | the value of the found variable, as a string. If the variable had no |
| 585 | value specified, the value will be NULL (typically this means it |
| 586 | should be interpreted as boolean true). |
| 587 | </p> |
| 588 | </li> |
| 589 | <li> |
| 590 | <p> |
| 591 | a void pointer passed in by the caller of the config API; this can |
| 592 | contain callback-specific data |
| 593 | </p> |
| 594 | </li> |
| 595 | </ul></div> |
| 596 | <div class="paragraph"><p>A config callback should return 0 for success, or -1 if the variable |
| 597 | could not be parsed properly.</p></div> |
| 598 | </div> |
| 599 | <h2 id="_basic_config_querying">Basic Config Querying</h2> |
| 600 | <div class="sectionbody"> |
| 601 | <div class="paragraph"><p>Most programs will simply want to look up variables in all config files |
| 602 | that git knows about, using the normal precedence rules. To do this, |
| 603 | call <tt>git_config</tt> with a callback function and void data pointer.</p></div> |
| 604 | <div class="paragraph"><p><tt>git_config</tt> will read all config sources in order of increasing |
| 605 | priority. Thus a callback should typically overwrite previously-seen |
| 606 | entries with new ones (e.g., if both the user-wide <tt>~/.gitconfig</tt> and |
| 607 | repo-specific <tt>.git/config</tt> contain <tt>color.ui</tt>, the config machinery |
| 608 | will first feed the user-wide one to the callback, and then the |
| 609 | repo-specific one; by overwriting, the higher-priority repo-specific |
| 610 | value is left at the end).</p></div> |
| 611 | <div class="paragraph"><p>The <tt>git_config_with_options</tt> function lets the caller examine config |
| 612 | while adjusting some of the default behavior of <tt>git_config</tt>. It should |
| 613 | almost never be used by "regular" git code that is looking up |
| 614 | configuration variables. It is intended for advanced callers like |
| 615 | <tt>git-config</tt>, which are intentionally tweaking the normal config-lookup |
| 616 | process. It takes two extra parameters:</p></div> |
| 617 | <div class="dlist"><dl> |
| 618 | <dt class="hdlist1"> |
| 619 | <tt>filename</tt> |
| 620 | </dt> |
| 621 | <dd> |
| 622 | <p> |
| 623 | If this parameter is non-NULL, it specifies the name of a file to |
| 624 | parse for configuration, rather than looking in the usual files. Regular |
| 625 | <tt>git_config</tt> defaults to <tt>NULL</tt>. |
| 626 | </p> |
| 627 | </dd> |
| 628 | <dt class="hdlist1"> |
| 629 | <tt>respect_includes</tt> |
| 630 | </dt> |
| 631 | <dd> |
| 632 | <p> |
| 633 | Specify whether include directives should be followed in parsed files. |
| 634 | Regular <tt>git_config</tt> defaults to <tt>1</tt>. |
| 635 | </p> |
| 636 | </dd> |
| 637 | </dl></div> |
| 638 | <div class="paragraph"><p>There is a special version of <tt>git_config</tt> called <tt>git_config_early</tt>. |
| 639 | This version takes an additional parameter to specify the repository |
| 640 | config, instead of having it looked up via <tt>git_path</tt>. This is useful |
| 641 | early in a git program before the repository has been found. Unless |
| 642 | you’re working with early setup code, you probably don’t want to use |
| 643 | this.</p></div> |
| 644 | </div> |
| 645 | <h2 id="_reading_specific_files">Reading Specific Files</h2> |
| 646 | <div class="sectionbody"> |
| 647 | <div class="paragraph"><p>To read a specific file in git-config format, use |
| 648 | <tt>git_config_from_file</tt>. This takes the same callback and data parameters |
| 649 | as <tt>git_config</tt>.</p></div> |
| 650 | </div> |
| 651 | <h2 id="_value_parsing_helpers">Value Parsing Helpers</h2> |
| 652 | <div class="sectionbody"> |
| 653 | <div class="paragraph"><p>To aid in parsing string values, the config API provides callbacks with |
| 654 | a number of helper functions, including:</p></div> |
| 655 | <div class="dlist"><dl> |
| 656 | <dt class="hdlist1"> |
| 657 | <tt>git_config_int</tt> |
| 658 | </dt> |
| 659 | <dd> |
| 660 | <p> |
| 661 | Parse the string to an integer, including unit factors. Dies on error; |
| 662 | otherwise, returns the parsed result. |
| 663 | </p> |
| 664 | </dd> |
| 665 | <dt class="hdlist1"> |
| 666 | <tt>git_config_ulong</tt> |
| 667 | </dt> |
| 668 | <dd> |
| 669 | <p> |
| 670 | Identical to <tt>git_config_int</tt>, but for unsigned longs. |
| 671 | </p> |
| 672 | </dd> |
| 673 | <dt class="hdlist1"> |
| 674 | <tt>git_config_bool</tt> |
| 675 | </dt> |
| 676 | <dd> |
| 677 | <p> |
| 678 | Parse a string into a boolean value, respecting keywords like "true" and |
| 679 | "false". Integer values are converted into true/false values (when they |
| 680 | are non-zero or zero, respectively). Other values cause a die(). If |
| 681 | parsing is successful, the return value is the result. |
| 682 | </p> |
| 683 | </dd> |
| 684 | <dt class="hdlist1"> |
| 685 | <tt>git_config_bool_or_int</tt> |
| 686 | </dt> |
| 687 | <dd> |
| 688 | <p> |
| 689 | Same as <tt>git_config_bool</tt>, except that integers are returned as-is, and |
| 690 | an <tt>is_bool</tt> flag is unset. |
| 691 | </p> |
| 692 | </dd> |
| 693 | <dt class="hdlist1"> |
| 694 | <tt>git_config_maybe_bool</tt> |
| 695 | </dt> |
| 696 | <dd> |
| 697 | <p> |
| 698 | Same as <tt>git_config_bool</tt>, except that it returns -1 on error rather |
| 699 | than dying. |
| 700 | </p> |
| 701 | </dd> |
| 702 | <dt class="hdlist1"> |
| 703 | <tt>git_config_string</tt> |
| 704 | </dt> |
| 705 | <dd> |
| 706 | <p> |
| 707 | Allocates and copies the value string into the <tt>dest</tt> parameter; if no |
| 708 | string is given, prints an error message and returns -1. |
| 709 | </p> |
| 710 | </dd> |
| 711 | <dt class="hdlist1"> |
| 712 | <tt>git_config_pathname</tt> |
| 713 | </dt> |
| 714 | <dd> |
| 715 | <p> |
| Junio C Hamano | 022bd34 | 2012-06-07 20:15:35 | [diff] [blame^] | 716 | Similar to <tt>git_config_string</tt>, but expands <tt>~</tt> or <tt>~user</tt> into the |
| Junio C Hamano | e0238c2 | 2012-02-23 22:45:50 | [diff] [blame] | 717 | user’s home directory when found at the beginning of the path. |
| 718 | </p> |
| 719 | </dd> |
| 720 | </dl></div> |
| 721 | </div> |
| 722 | <h2 id="_include_directives">Include Directives</h2> |
| 723 | <div class="sectionbody"> |
| 724 | <div class="paragraph"><p>By default, the config parser does not respect include directives. |
| 725 | However, a caller can use the special <tt>git_config_include</tt> wrapper |
| 726 | callback to support them. To do so, you simply wrap your "real" callback |
| 727 | function and data pointer in a <tt>struct config_include_data</tt>, and pass |
| 728 | the wrapper to the regular config-reading functions. For example:</p></div> |
| 729 | <div class="listingblock"> |
| 730 | <div class="content"> |
| 731 | <pre><tt>int read_file_with_include(const char *file, config_fn_t fn, void *data) |
| 732 | { |
| 733 | struct config_include_data inc = CONFIG_INCLUDE_INIT; |
| 734 | inc.fn = fn; |
| 735 | inc.data = data; |
| 736 | return git_config_from_file(git_config_include, file, &inc); |
| 737 | }</tt></pre> |
| 738 | </div></div> |
| 739 | <div class="paragraph"><p><tt>git_config</tt> respects includes automatically. The lower-level |
| 740 | <tt>git_config_from_file</tt> does not.</p></div> |
| 741 | </div> |
| 742 | <h2 id="_writing_config_files">Writing Config Files</h2> |
| 743 | <div class="sectionbody"> |
| 744 | <div class="paragraph"><p>TODO</p></div> |
| 745 | </div> |
| 746 | </div> |
| 747 | <div id="footnotes"><hr /></div> |
| 748 | <div id="footer"> |
| 749 | <div id="footer-text"> |
| Junio C Hamano | 022bd34 | 2012-06-07 20:15:35 | [diff] [blame^] | 750 | Last updated 2012-06-07 13:15:22 PDT |
| Junio C Hamano | e0238c2 | 2012-02-23 22:45:50 | [diff] [blame] | 751 | </div> |
| 752 | </div> |
| 753 | </body> |
| 754 | </html> |
