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

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+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)

lua/ml_gsubfile.sas

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+/**
+  @file ml_gsubfile.sas
+  @brief Compiles the gsubfile.lua lua file
+  @details Writes gsubfile.lua to the work directory
+  and then includes it.
+  Usage:
+
+      %ml_gsubfile()
+
+**/
+
+%macro ml_gsubfile();
+data _null_;
+  file "%sysfunc(pathname(work))/ml_gsubfile.lua";
+  put 'local fpath, outpath, file, fcontent ';
+  put ' ';
+  put '-- configure in / out paths ';
+  put 'fpath = sas.symget("file") ';
+  put 'outpath = sas.symget("outfile") ';
+  put 'if ( outpath == 0 ) ';
+  put 'then ';
+  put '   outpath=fpath ';
+  put 'end ';
+  put ' ';
+  put '-- open file and perform the substitution ';
+  put 'file = io.open(fpath,"r") ';
+  put 'fcontent = file:read() ';
+  put 'file:close() ';
+  put 'fcontent = string.gsub( ';
+  put '  fcontent, ';
+  put '  sas.symget(sas.symget("patternvar")), ';
+  put '  sas.symget(sas.symget("replacevar")) ';
+  put ') ';
+  put ' ';
+  put '-- write the file back out ';
+  put 'file = io.open(outpath, "w+") ';
+  put 'io.output(file) ';
+  put 'io.write(fcontent) ';
+  put 'io.close(file) ';
+run;
+
+%inc "%sysfunc(pathname(work))/ml_gsubfile.lua";
+
+%mend ml_gsubfile;