rewrite sed logic used in Makefiles and move into dosubst awk script.

include 'bin' and its files in dist files, this is where dosubst is located.

While the invocation (passing of the variables)
is not optimal (yet, will be changed), this
will in the end allow sharing code between Makefiles better,
and maybe drop sed usage in the future.

2 files changed, 53 insertions, 0 deletions

diff --git a/bin/Makefile.am b/bin/Makefile.am
new file mode 100644
index 000000000..6c11e26ef
--- /dev/null
+++ b/bin/Makefile.am
@@ -0,0 +1,6 @@
+EXTRA_DIST = \
+  dosubst.awk \
+  grephdr.sh \
+  grepsrc.sh \
+  pogen.sh \
+  rename.sh
diff --git a/bin/dosubst.awk b/bin/dosubst.awk
new file mode 100755
index 000000000..3ed0403dd
--- /dev/null
+++ b/bin/dosubst.awk
@@ -0,0 +1,47 @@
+# Dedicated to the public domain.
+# SPDX-License-Identifier: 0BSD
+#
+# awk script to substitute variables in scripts and applications.
+#
+# You can pass these variables to it in Makefiles or on the
+# commandline:
+#  bdir="$(bindir)"
+#  py="$(PYTHON)"
+#  awkay="$(AWK_BINARY)"
+#  pfx="$(prefix)"
+#  prl="$(PERL)"
+#  sysconfdirectory="$(sysconfdir)"
+#  pkgdatadirectory="$(pkgdatadir)"
+
+{
+
+  if (/@bindirectory@/) {
+    gsub("@bindirectory@",bdir) ;
+  }
+
+  if (/@PYTHONEXE@/) {
+    gsub("@PYTHONEXE@",py) ;
+  }
+
+  if (/@AWKEXE@/) {
+    gsub("@AWKEXE@",awkay) ;
+  }
+
+  if (/@SUBSTPREFIX@/) {
+    gsub("@SUBSTPREFIX@",pfx) ;
+  }
+
+  if (/@PERLEXE@/) {
+    gsub("@PERLEXE@",prl) ;
+  }
+
+  if (/@SYSCONFDIR@/) {
+    gsub("@SYSCONFDIR@",sysconfdirectory) ;
+  }
+
+  if (/@PKGDATADIRECTORY@/) {
+    gsub("@PKGDATADIRECTORY@",pkgdatadirectory) ;
+  }
+
+  print $0 ;
+}