NAME

Arch::Backend - Arch backend feature specific functions

SYNOPSIS

    use Arch::Backend qw(arch_backend is_baz has_file_diffs_cmd);
    my $exe = arch_backend();
    print "Not in tree, try '$exe init-tree'\n";
    my $version = Arch::Backend::arch_backend_version;
    print "Using baz $version as a backend\n" if is_baz();
    my $cmd = has_file_diffs_cmd()
        ? "file-diffs"
        : "file-diff";
    Arch::Util::run_tla($cmd, $filename);

DESCRIPTION

A set of helper functions suitable for GNU Arch related projects in Perl.

Higher (object oriented) levels of Arch/Perl library make use of these helper functions to query certain aspects (like incompatible features) of the actual arch backend used.

FUNCTIONS

The following functions are available:

arch_backend, arch_backend_name, arch_backend_version, is_tla, is_baz, has_archive_setup_cmd, has_file_diffs_cmd, has_register_archive_name_arg, has_tree_version_dir_opt, has_tree_id_cmd, has_set_tree_version_cmd, has_cache_feature, get_cache_config, has_commit_version_arg, has_commit_files_separator, has_revlib_patch_set_dir.

arch_backend [exe]: Return or set the arch backend executable, like "/opt/bin/tla" or "baz-1.3".
By default, the arch backend executable is taken from environment variable $ARCH_BACKEND (or $TLA, or $BAZ). If no environment variable is set, then "tla" is used.
arch_backend_name: Return the brand name of the arch backend, "tla" or "baz".
arch_backend_version: Return the arch backend version, like "1.3.1".
is_tla: Return true if arch_backend_name is "tla".
is_baz: Return true if arch_backend_name is "baz".
has_archive_setup_cmd: Return true if the arch backend has "archive-setup" command. baz removed this command.
has_file_diffs_cmd: Return true if the arch backend has "file-diffs" command. It was renamed to "file-diff" in tla-1.3.
has_register_archive_name_arg: Return true if the arch backend's "register-archive" command supports two positional arguments, one of which is archive name. baz-1.3 removed such syntax; the previous baz versions supported this syntax, but it was useless, since the archive was accessed anyway.
has_tree_version_dir_opt: Return true if the arch backend's "tree-version" command supports "-d" options. This is true for baz.
has_tree_id_cmd: Return true if the arch backend has "tree-id" command. This is true for baz.
has_set_tree_version_cmd: Return true if the arch backend has "set-tree-version" command. baz removed this command and merged it into "tree-version".
has_cache_feature: Return true if the arch backend supports Arch Cache feature. This is true for baz.
get_cache_config: Return hash with the following keys: dir - directory of the local cache (or undef if not applicable).
has_commit_version_arg: Return true if the arch backend's "commit" command supports version argument. baz-1.4 removed this functionality.
has_commit_files_separator: Return true if the arch backend's "commit" command requires "--" argument to separate files. baz-1.4 removed this separator.
has_revlib_patch_set_dir: Return true if the arch backend's creates ,,patch-set subdirectory in revision library. baz-1.4 removed this functionality.

BUGS

This module uses heuristics and does not (intend to) provide the perfect information. Requires constant updating.

AUTHORS