core: add support for alternative installation locations

This introduces the UBX_PATH environemnt variable, which can be used to specify alternative installation paths. If defined, ubx will search the colon separated list of directories for ubx headers and modules. Signed-off-by: Markus Klotzbuecher <mk@mkio.de>
kmarkus · Feb 4, 2020 · f0acaa7 · f0acaa7
1 parent bc8a5cb
commit f0acaa7
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diff --git a/API_Changes.md b/API_Changes.md
@@ -5,6 +5,10 @@ This file tracks user visible API changes.
 
 ## v0.7.1
 
+- core: add environment variable `UBX_PATH` that can be used to
+  specify alternative installation paths. If defined, ubx will search
+  the colon separated list of directories for ubx headers and modules.
+
 - core: ffi: types: strip preprocessor directives from types that are
   fed to the ffi. This is to allow include guards in these header
   files.

diff --git a/lua/ubx.lua.source b/lua/ubx.lua.source
@@ -130,7 +130,10 @@ local load_files = {
 }
 
 -- possible file prefixes for above headers and libraries
-local prefixes = { "/usr", "/usr/local" }
+local prefixes = {
+   unpack(utils.split(os.getenv("UBX_PATH") or "", ':')),
+   "/usr", "/usr/local"
+}
 
 local function find_prefix()
    for _,pf in ipairs(prefixes) do