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.

tests/crossplatform/mp_gsubfile.test.sas

@@ -0,0 +1,33 @@
+/**
+  @file
+  @brief Testing mp_gsubfile.sas macro
+
+  <h4> SAS Macros </h4>
+  @li mp_gsubfile.sas
+  @li mp_assert.sas
+
+**/
+
+/**
+  * test 1 - simple replace
+  */
+%global str1;
+%let file=%sysfunc(pathname(work))/file.txt;
+%let pat=replace/me;
+%let str=with/this;
+data _null_;
+  file "&file";
+  put "&pat";
+run;
+%mp_gsubfile(file=&file, patternvar=pat, replacevar=str)
+data _null_;
+  infile "&file";
+  input;
+  call symputx('str1',_infile_);
+run;
+
+%mp_assert(
+  iftrue=("&str1"="&str"),
+  desc=Check that simple replacement was successful,
+  outds=work.test_results
+)