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--- cookbooks:devel:core [2020/11/11 09:37]
miconda [loadpath]
+++ cookbooks:devel:core [2020/11/19 16:38]
miconda [subst]
@@ Line 359: / Line 359: @@
     * text on the same line as the directive will cause problems. Keep the directive lines clean and only comment on a line before or after.
+==== defenv ====
+Preprocessor directive to define an ID to the value of an environment variable with the name ENVVAR.
+<code c>
+#!defenv ID=ENVVAR
+</code>
+It can also be just **$!defenv ENVVAR** and the defined ID is the ENVVAR name.
+Example:
+<code c>
+#!defenv SHELL
+</code>
+If environment variable $SHELL is '/bin/bash', then it is like:
+<code c>
+#!define SHELL /bin/bash
+</code>
+Full expression variant:
+<code c>
+#!defenv ENVSHELL=SHELL
+</code>
+Then it is like:
+<code c>
+#!define ENVSHELL /bin/bash
+</code>
+It is a simplified alternative of using **#!substdef** with **$env(NAME)** in the replacement part.
 ==== subst ====

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