+
+# Determine the base directories we require.
+prefix=${input_option_prefix-${this_prefix:-@prefix@}}
+exec_prefix=${input_option_exec_prefix-${input_option_prefix-${this_exec_prefix:-@exec_prefix@}}}
+wxconfdir="@libdir@/wx/config"
+
+installed_configs=$( cd "$wxconfdir" 2> /dev/null && ls | grep -v "^inplace-" )
+
+target="@host_alias@"
+
+# Define a pseudo-hash to contain the specification of this wx-config
+# instance and its associated library.
+this_host="${target:+${target}-}"
+this_toolkit="@TOOLKIT_DIR@@TOOLKIT_VERSION@"
+this_widgetset="@WIDGET_SET@"
+this_chartype="@WX_CHARTYPE@"
+this_debugtype="@WX_DEBUGTYPE@"
+this_flavour="@WX_FLAVOUR@"
+this_version="@WX_RELEASE@"
+this_linkage=$( [ @SHARED@ -eq 1 ] || echo '-static' )
+
+this_config=$(get_mask this)
+
+# Extract the user specification from the options parsed.
+m_host=${input_option_host:+${input_option_host}-?}
+m_host=${m_host:-${input_option_host-$this_host}}
+m_toolkit=${input_option_toolkit:-[^-]+}
+m_widgetset=${input_option_widgetset-(univ)?}
+m_chartype=${input_option_chartype:-(unicode|ansi)}
+m_debugtype=${input_option_debugtype:-(debug|release)}
+m_flavour=${input_option_flavour:+-$input_option_flavour}
+m_flavour=${m_flavour:-${input_option_flavour-(-[^-]+)?}}
+m_version=${input_option_version:-[0-9]+\.[0-9]+}
+m_linkage=${input_option_linkage-(-static)?}
+
+configmask="^$(get_mask)$"
+
+
+# Dump the user specification in debug mode.
+if [ -n "$WXDEBUG" ]; then
+
+ decho
+ decho " prefix = '$prefix'"
+ decho " exec_prefix = '$exec_prefix'"
+ decho " wxconfdir = '$wxconfdir'"
+
+ decho " m_host = '$m_host'"
+ decho " m_toolkit = '$m_toolkit'"
+ decho " m_widgetset = '$m_widgetset'"
+ decho " m_chartype = '$m_chartype'"
+ decho " m_debugtype = '$m_debugtype'"
+ decho " m_flavour = '$m_flavour'"
+ decho " m_version = '$m_version'"
+ decho " m_linkage = '$m_linkage'"
+
+ decho " configmask = '$configmask'"
+ decho " this config = '$this_config'"
+ decho
+
+fi
+
+
+
+# From here on, we'll need to be able to figure out a delegation target.
+# -----------------------------------------------------------------------
+
+# The rules for delegation are:
+#
+# 1. If the specification is so general that it matches the default config
+# (ie. this one on a first pass), then the default config will be used
+# even if other installed libs would also match the spec.
+#
+# 2. If the default config does not match, find a list of all installed
+# libraries that do match.
+# a. If that list is empty, the specification is incompatible
+# with any installed lib. Warn and abort.
+# b. If that list contains exactly one candidate. Delegate to
+# that candidate.
+# c. If the list contains multiple candidates, pass on to step 3.
+#
+# 3. Attempt to discriminate among rival candidates by their similarity
+# to the default configuration (ie. this one). If we can find a unique
+# candidate in this way, delegate to it. If not, present a list of
+# options to the user and request that they disambiguate it with one or
+# more additional fields.
+#
+# To refine the specified pattern, we specialise each unbound field
+# using the default value from this config file. If that results in
+# no matches, we unbind it again and try the next field. If it still
+# results in multiple matches we try binding the next field as well
+# until a unique or null result again occurs.
+#
+# A more general way to look at this, is the feature specifiers are all
+# modifiers of the wx-config you are calling. If you supply none, the
+# default for that build configuration will be used. If you supply one
+# or more that the default build cannot satisfy, it will try to find the
+# config most like itself with the desired feature(s) enabled.
+# The features configured into the first wx-config called will be taken
+# as implicitly specified if it is necessary to disambiguate likely
+# candidates from the information that was explicitly provided.
+
+
+# But first, more sugar to keep what follows clear and legible.
+# --------------------------------------------------------------
+
+# find_eligible_delegates _mask
+# Outputs all the config files installed which match the
+# (extended regex) _mask passed as an argument.
+find_eligible_delegates() { echo "$installed_configs" | grep -E "$1" 2> /dev/null; }
+
+# user_mask_fits _config
+# Returns true if the string _config satisfies the user specified mask.
+user_mask_fits() { echo "$1" | grep -E "$configmask" > /dev/null 2>&1; }
+
+# count_fields _word
+# Returns the number of IFS split fields in _word
+count_fields() { return $#; }
+
+# count_delegates _mask
+# Return the number of eligible config files that match _mask
+count_delegates() { count_fields $(find_eligible_delegates $1); }
+
+# is_set _variablename
+# Returns true if $_variablename is initialised.
+is_set() { [ "x$(eval echo \"\${$1-unset}\")" != "xunset" ]; }
+
+# do_find_best_delegate _unbound-options
+# The real worker part of find_best_delegate below. Recurses though all
+# unbound options binding them one at a time to the default derived from
+# this file until a unique match is made or no alternatives remain that
+# may be sensibly guessed at. It will preferentially bind the unspecified
+# options in the order they are listed in wxconfig_schema. Using this
+# partial ordering it should find the first match with the most significant
+# similarity to this file that unambiguously meets the user specification.
+# If such a match exists it will be output to stdout.
+#
+# Be careful if you modify this function. If the pruning logic is rendered
+# inoperative it will simply recurse over every permutation in the search
+# space, which may still appear to work, but add a couple more options (or
+# explicitly specify a few less) and you may not live long enough to learn
+# the result. WXDEBUG=findprogress is your friend here, it will show you
+# how many nodes get searched before a result. If you start seeing
+# increases in that number for the same input, check your work.
+# Raising the number of discriminating options from 6 to 8 raised the worst
+# case time for this to run (without pruning) from 3 to nearly 15 seconds
+# and its downhill fast from here if we have to ride that boat.
+# Early pruning still gets that down to under half a second (up from about
+# .25), so we have some breathing space yet before a different search method
+# will be called for, but lets not squander it.
+do_find_best_delegate()
projects / wxWidgets.git / blobdiff