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[argpar.git] / m4 / ae_config_feature.m4
1 #
2 # SYNOPSIS
3 #
4 # AE_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION,
5 # ACTION-IF-GIVEN?, ACTION-IF-NOT-GIVEN?,
6 # ACTION-IF-ENABLED?, ACTION-IF-NOT-ENABLED?)
7 #
8 # DESCRIPTION
9 #
10 # AE_FEATURE is a simple wrapper for AC_ARG_ENABLE.
11 #
12 # FEATURE-NAME should consist only of alphanumeric characters, dashes,
13 # plus signs, and dots.
14 #
15 # FEATURE-DESCRIPTION will be formatted with AS_HELP_STRING.
16 #
17 # If the user gave configure the option --enable-FEATURE or --disable-FEATURE,
18 # run shell commands ACTION-IF-GIVEN. If neither option was given, run shell
19 # commands ACTION-IF-NOT-GIVEN. The name feature indicates an optional
20 #
21 # If the feature is enabled, run shell commands ACTION-IF-ENABLED, if it is
22 # disabled, run shell commands ACTION-IF-NOT-ENABLED.
23 #
24 # A FEATURE has 3 different states, enabled, disabled and undefined. The first
25 # two are self explanatory, the third state means it's disabled by default
26 # and it was not explicitly enabled or disabled by the user or by the
27 # AE_FEATURE_ENABLE and AE_FEATURE_DISABLE macros.
28 #
29 # A feature is disabled by default, in order to change this behaviour use the
30 # AE_FEATURE_DEFAULT_ENABLE and AE_FEATURE_DEFAULT_DISABLE
31 # macros.
32 #
33 # A simple example:
34 #
35 # AE_FEATURE_DEFAULT_ENABLE
36 # AE_FEATURE(feature_xxxxx, [turns on/off XXXXX support])
37 #
38 # ...
39 #
40 # AE_FEATURE_DEFAULT_DISABLE
41 # AE_FEATURE(feature_yyyyy, [turns on/off YYYYY support])
42 # AM_CONDITIONAL(YYYYY, AE_IS_FEATURE_ENABLED([feature_yyyyy]))
43 #
44 # AE_FEATURE_DEFAULT_ENABLE
45 # AE_FEATURE(...)
46 #
47 # ...
48 #
49 # Use AE_FEATURE_ENABLE or AE_FEATURE_DISABLE in order to
50 # enable or disable a specific feature.
51 #
52 # Another simple example:
53 #
54 # AS_IF([some_test_here],[AE_FEATURE_ENABLE(feature_xxxxx)],[])
55 #
56 # AE_FEATURE(feature_xxxxx, [turns on/off XXXXX support],
57 # HAVE_XXXXX, [Define if you want XXXXX support])
58 # AE_FEATURE(feature_yyyyy, [turns on/off YYYYY support],
59 # HAVE_YYYYY, [Define if you want YYYYY support])
60 #
61 # ...
62 #
63 # NOTE: AE_FEATURE_ENABLE/DISABLE() must be placed first of the relative
64 # AE_FEATURE() macro if you want the the proper ACTION-IF-ENABLED and
65 # ACTION-IF-NOT-ENABLED to run.
66 #
67 # LICENSE
68 #
69 # Copyright (c) 2020 Michael Jeanson <mjeanson@efficios.com>
70 # Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
71 #
72 # This program is free software; you can redistribute it and/or modify it
73 # under the terms of the GNU General Public License as published by the
74 # Free Software Foundation; either version 2 of the License, or (at your
75 # option) any later version.
76 #
77 # This program is distributed in the hope that it will be useful, but
78 # WITHOUT ANY WARRANTY; without even the implied warranty of
79 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
80 # Public License for more details.
81 #
82 # You should have received a copy of the GNU General Public License along
83 # with this program. If not, see <https://www.gnu.org/licenses/>.
84 #
85 # As a special exception, the respective Autoconf Macro's copyright owner
86 # gives unlimited permission to copy, distribute and modify the configure
87 # scripts that are the output of Autoconf when processing the Macro. You
88 # need not follow the terms of the GNU General Public License when using
89 # or distributing such scripts, even though portions of the text of the
90 # Macro appear in them. The GNU General Public License (GPL) does govern
91 # all other use of the material that constitutes the Autoconf Macro.
92 #
93 # This special exception to the GPL applies to versions of the Autoconf
94 # Macro released by the Autoconf Archive. When you make and distribute a
95 # modified version of the Autoconf Macro, you may extend this special
96 # exception to the GPL to apply to your modified version as well.
97
98 #serial 1
99
100
101 # AE_FEATURE_DEFAULT_ENABLE: The next feature defined with AE_FEATURE will
102 # default to enable.
103 AC_DEFUN([AE_FEATURE_DEFAULT_ENABLE], [
104 m4_define([ae_feature_default_arg], [yes])
105 m4_define([ae_feature_default_switch], [disable])
106 ])
107
108
109 # AE_FEATURE_DEFAULT_DISABLE: The next feature defined with AE_FEATURE will
110 # default to disable.
111 #
112 AC_DEFUN([AE_FEATURE_DEFAULT_DISABLE], [
113 m4_define([ae_feature_default_arg], [no])
114 m4_define([ae_feature_default_switch], [enable])
115 ])
116
117
118 # AE_FEATURE_ENABLE(FEATURE-NAME): Enable the FEATURE, this will override the
119 # user's choice if it was made.
120 #
121 AC_DEFUN([AE_FEATURE_ENABLE],[ dnl
122 enable_[]patsubst([$1], -, _)[]=yes
123 ])
124
125
126 # AE_FEATURE_DISABLE(FEATURE-NAME): Disable the FEATURE, this will override the
127 # user's choice if it was made.
128 #
129 AC_DEFUN([AE_FEATURE_DISABLE],[ dnl
130 enable_[]patsubst([$1], -, _)[]=no
131 ])
132
133
134 # AE_IF_FEATURE_ENABLED(FEATURE-NAME, ACTION-IF-ENABLED, ACTION-IF-NOT-ENABLED?):
135 # Run shell code ACTION-IF-ENABLED if the FEATURE is enabled, otherwise run
136 # shell code ACTION-IF-NOT-ENABLED.
137 #
138 AC_DEFUN([AE_IF_FEATURE_ENABLED],[ dnl
139 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
140
141 AS_IF([test "$enable_[]FEATURE[]" = yes],[ dnl
142 $2
143 ],[: dnl
144 $3
145 ])
146 ])
147
148
149 # AE_IF_FEATURE_NOT_ENABLED(FEATURE-NAME, ACTION-IF-NOT-ENABLED,
150 # ACTION-IF-NOT-NOT-ENABLED?):
151 # Run shell code ACTION-IF-NOT-ENABLED if the FEATURE is not explicitly
152 # enabled, otherwise run shell code ACTION-IF-NOT-NOT-DISABLED.
153 #
154 # The distinction with AE_IF_FEATURE_DISABLED is that this will also
155 # match a feature that is undefined.
156 #
157 # A feature is undefined when it's disabled by default and was not explicitly
158 # enabled or disabled by the user or by AE_FEATURE_ENABLE/DISABLE.
159 #
160 AC_DEFUN([AE_IF_FEATURE_NOT_ENABLED],[ dnl
161 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
162
163 AS_IF([test "$enable_[]FEATURE[]" != yes],[ dnl
164 $2
165 ],[: dnl
166 $3
167 ])
168 ])
169
170
171 # AE_IF_FEATURE_DISABLED(FEATURE-NAME, ACTION-IF-DISABLED, ACTION-IF-NOT-DISABLED?):
172 # Run shell code ACTION-IF-DISABLED if the FEATURE is disabled, otherwise run
173 # shell code ACTION-IF-NOT-DISABLED.
174 #
175 AC_DEFUN([AE_IF_FEATURE_DISABLED],[ dnl
176 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
177
178 AS_IF([test "$enable_[]FEATURE[]" = no],[ dnl
179 $2
180 ],[: dnl
181 $3
182 ])
183 ])
184
185
186 # AE_IF_FEATURE_UNDEF(FEATURE-NAME, ACTION-IF-UNDEF, ACTION-IF-NOT-UNDEF?):
187 # Run shell code ACTION-IF-UNDEF if the FEATURE is undefined, otherwise run
188 # shell code ACTION-IF-NOT-UNDEF.
189 #
190 # A feature is undefined when it's disabled by default and was not explicitly
191 # enabled or disabled by the user or by AE_FEATURE_ENABLE/DISABLE.
192 #
193 AC_DEFUN([AE_IF_FEATURE_UNDEF],[ dnl
194 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
195
196 AS_IF([test "x$enable_[]FEATURE[]" = x],[ dnl
197 $2
198 ],[: dnl
199 $3
200 ])
201 ])
202
203
204 # AE_IS_FEATURE_ENABLED(FEATURE-NAME): outputs a shell condition (suitable
205 # for use in a shell if statement) that will return true if the FEATURE is
206 # enabled.
207 #
208 AC_DEFUN([AE_IS_FEATURE_ENABLED],[dnl
209 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
210 test "x$enable_[]FEATURE[]" = xyes dnl
211 ])
212
213
214 dnl Disabled by default, unless already overriden
215 m4_ifndef([ae_feature_default_arg],[AE_FEATURE_DEFAULT_DISABLE])
216
217
218 # AE_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION,
219 # ACTION-IF-GIVEN?, ACTION-IF-NOT-GIVEN?,
220 # ACTION-IF-ENABLED?, ACTION-IF-NOT-ENABLED?):
221 #
222 #
223 AC_DEFUN([AE_FEATURE],[ dnl
224 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl
225
226 dnl If the option wasn't specified and the default is enabled, set enable_FEATURE to yes
227 AS_IF([test "x$enable_[]FEATURE[]" = x && test "ae_feature_default_arg" = yes],[ dnl
228 enable_[]FEATURE[]="ae_feature_default_arg"
229 ])
230
231 AC_ARG_ENABLE([$1],
232 AS_HELP_STRING([--ae_feature_default_switch-$1],dnl
233 [$2 [default=ae_feature_default_arg]]),[
234 case "${enableval}" in
235 yes)
236 enable_[]FEATURE[]=yes
237 ;;
238 no)
239 enable_[]FEATURE[]=no
240 ;;
241 *)
242 AC_MSG_ERROR([bad value ${enableval} for feature --$1])
243 ;;
244 esac
245
246 $3
247 ],[: dnl
248 $4
249 ])
250
251 AS_IF([test "$enable_[]FEATURE[]" = yes],[: dnl
252 $5
253 ],[: dnl
254 $6
255 ])
256
257 m4_popdef([FEATURE])dnl
258 ])
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