strip some code and add some helpful logging

Makefile

@@ -1,7 +1,7 @@
 OS := $(shell uname)
 COMPILER := $(shell test "${OS}" = "Linux" -a -x "/bin/g++" && echo "_gcc")
 
-BUILD_Darwin = clang++ procenv.cpp process.cpp -o procenv -std=c++17 -Wall -arch arm64 -arch x86_64
+BUILD_Darwin = clang++ procenv.cpp process.cpp -o procenv -g -std=c++17 -Wall -arch arm64 -arch x86_64
 BUILD_Linux_gcc = g++ procenv.cpp process.cpp -o procenv -std=c++17 -Wall -static-libgcc -static-libstdc++ -static
 BUILD_Linux = clang++ procenv.cpp process.cpp -o procenv -std=c++17 -Wall
 BUILD_FreeBSD = clang++ procenv.cpp process.cpp -o procenv -std=c++17 -Wall -lelf -lkvm -lpthread -static
@@ -13,7 +13,7 @@ BUILD_Windows = g++ procenv.cpp process.cpp -o procenv.exe -std=c++17 -Wall -sta
 
 BUILD = ${BUILD_${OS}${COMPILER}}
 
-procenv: procenv.cpp process.cpp process.hpp
+procenv: procenv.cpp process.cpp process.hpp Makefile
 ifeq (${BUILD},)
 	@echo "Unsupported OS/compiler combination: ${OS}${COMPILER}"
 	@exit 1

procenv.cpp

@@ -32,15 +32,10 @@ int main(int argc, char **argv) {
         printf("procenv <pid>\n");
         return 0;
     }
-    int thepid = std::stoi(argv[1]);
-    std::vector<ngs::ps::NGS_PROCID> pids = ngs::ps::proc_id_enum();
-
-    for (std::size_t i = 0; i < pids.size(); i++) {
-        std::vector<std::string> env = ngs::ps::environ_from_proc_id(pids[i]);
-        for (std::size_t j = 0; j < env.size(); j++)
-          if (pids[i] == thepid) {
-            std::cout << env[j] << "\n";
-          }
-        }
+    int proc_id = std::stoi(argv[1]);
+    std::vector<std::string> env = ngs::ps::environ_from_proc_id(proc_id);
+    for (std::size_t j = 0; j < env.size(); j++) {
+        std::cout << env[j] << "\n";
+    }
     return 0;
 }