Move cmake defaults into CMakeLists.txt file, and document default(s).

CMakeLists.txt

@@ -25,8 +25,12 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 if(NOT CMAKE_INSTALL_PREFIX)
     set(CMAKE_INSTALL_PREFIX /)
 endif(NOT CMAKE_INSTALL_PREFIX)
+message("-- Install prefix set to '${CMAKE_INSTALL_PREFIX}'")
 
-message("-- Install prefix set to ${CMAKE_INSTALL_PREFIX}")
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Release )
+endif(NOT CMAKE_BUILD_TYPE)
+message("-- Install type set to '${CMAKE_BUILD_TYPE}'")
 
 add_definitions("-std=c++14 -Wall -Wextra -Wno-unused-parameter -Wno-sign-compare")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Werror -DDEBUG")
@@ -120,20 +124,20 @@ install(TARGETS laminard laminarc RUNTIME DESTINATION usr/bin)
 install(FILES etc/laminar.service DESTINATION ${SYSTEMD_UNITDIR})
 
 # An initial attempt at solving https://github.com/ohwgiles/laminar/issues/92
-if(NOT EXISTS "/etc/laminar.conf")
+if(NOT EXISTS "${CMAKE_INSTALL_PREFIX}etc/laminar.conf")
     install(
-        FILES etc/laminar.conf
+        FILES ${CMAKE_INSTALL_PREFIX}etc/laminar.conf
         DESTINATION etc
     )
-else()
+else(NOT EXISTS "${CMAKE_INSTALL_PREFIX}etc/laminar.conf")
     # hardcoded values are examples of technical debt, and in an ideal world, are eliminated.
-    MESSAGE("-- An /etc/laminar.conf file exists, will create /etc/laminar.conf.example instead of overwriting.")
+    MESSAGE("-- A ${CMAKE_INSTALL_PREFIX}etc/laminar.conf file exists, will create ${CMAKE_INSTALL_PREFIX}etc/laminar.conf.example instead of overwriting.")
     # This also displays at config time, rather than install time.
     # In an ideal world, the user gets offered the option to overwrite, compare, or keep/copy the file
     install(
-        FILES etc/laminar.conf
+        FILES ${CMAKE_INSTALL_PREFIX}etc/laminar.conf
         DESTINATION etc
         RENAME "laminar.conf.example"
     )
-endif()
+endif(NOT EXISTS "${CMAKE_INSTALL_PREFIX}etc/laminar.conf")
 

README.md

@@ -15,10 +15,13 @@ First install development packages for `capnproto (version 0.7.0 or newer)`, `ra
 ```bash
 git clone https://github.com/ohwgiles/laminar.git
 cd laminar
-cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/
+cmake .
 make -j4
 sudo make install
 ```
+Note that by default, installing with `(c)make` will overwrite your existing configuration, binary, and unit files. Make backups!
+
+The CMakeLists.txt file sets `cmake` defaults to `CMAKE_INSTALL_PREFIX=/` and `CMAKE_BUILD_TYPE=Release`, which can be overridden with the `-DCMAKE_INSTALL_PREFIX=<path>` and `-DCMAKE_BUILD_TYPE=<type>` flags, respectively.
 
 `make install` includes a systemd unit file. If you intend to use it, consider creating a new user `laminar` or modifying the user specified in the unit file.