feat: adding mp_gsubfile.sas - a SAS macro that uses Lua to perform a full text find and replace of an entire file. Not restricted by number of characters (only memory). IIncludes a test.

lua/gsubfile.lua

@@ -0,0 +1,25 @@
+local fpath, outpath, file, fcontent
+
+-- configure in / out paths
+fpath = sas.symget("file")
+outpath = sas.symget("outfile")
+if ( outpath == 0 )
+then
+   outpath=fpath
+end
+
+-- open file and perform the substitution
+file = io.open(fpath,"r")
+fcontent = file:read()
+file:close()
+fcontent = string.gsub(
+  fcontent,
+  sas.symget(sas.symget("patternvar")),
+  sas.symget(sas.symget("replacevar"))
+)
+
+-- write the file back out
+file = io.open(outpath, "w+")
+io.output(file)
+io.write(fcontent)
+io.close(file)