Made the CPLEX and gurobi check if-else statment more human readable

R/JaBbA.R

@@ -54,20 +54,24 @@ low.count=high.count=seg=chromosome=alpha_high=alpha_low=beta_high=beta_low=pred
                !file.exists(paste0(cplex.dir, "/cplex/lib"))){
         jmessage("${CPLEX_DIR}/cplex/[(include)|(lib)] do not both exist")
     }
-
-    if (((!file.exists(paste0(cplex.dir, "/cplex"))) & (!file.exists(paste0(cplex.dir, "/cplex/include")) ||
-               !file.exists(paste0(cplex.dir, "/cplex/lib")))) & (requireNamespace("gurobi", quietly = TRUE))) {
+
+    # variable that stores checks for CPLEX directory and its lib & include folder
+    cplex_installation = ((file.exists(paste0(cplex.dir, "/cplex"))) & (file.exists(paste0(cplex.dir, "/cplex/include")) ||
+               file.exists(paste0(cplex.dir, "/cplex/lib"))))
+    # variable that stores boolean information for Gurobi installation
+    gurobi_installation = (requireNamespace("gurobi", quietly = TRUE))
+
+    # check to verify whether gurobi or cplex or both or none. if cplex or both cplex and gurobi found, it will run cplex connection for gGnome package
+    if ((!cplex_installation) & (gurobi_installation)) {
         jmessage("Gurobi is installed! Will use Gurobi instead of CPLEX if mentioned use.gurobi=TRUE")
 
-    } else if (((file.exists(paste0(cplex.dir, "/cplex"))) & (file.exists(paste0(cplex.dir, "/cplex/include")) ||
-               file.exists(paste0(cplex.dir, "/cplex/lib")))) & (!requireNamespace("gurobi", quietly = TRUE))) {
+    } else if ((cplex_installation) & (!gurobi_installation)) {
 
 	jmessage("CPLEX found, will check if gGnome is wired up with CPLEX...")
         library(gGnome)
         gGnome:::testOptimizationFunction()
 
-    } else if (((file.exists(paste0(cplex.dir, "/cplex"))) & (file.exists(paste0(cplex.dir, "/cplex/include")) ||
-               file.exists(paste0(cplex.dir, "/cplex/lib")))) & (requireNamespace("gurobi", quietly = TRUE))) {
+    } else if ((cplex_installation) & (gurobi_installation)) {
 
 	jmessage("Both CPLEX and Gurobi is found, will check if gGnome has CPLEX wired since by default JaBbA use CPLEX...")
 	library(gGnome)