From c9185f42835c52956b4cb906d765d5b4e6bb3539 Mon Sep 17 00:00:00 2001
From: Hisham Muhammad <hisham@gobolinux.org>
Date: Mon, 11 Jun 2018 18:11:20 -0300
Subject: builtin: if "libraries" is used but "external_dependencies" is not
 given, autogenerate it

The approach is slightly ugly since it adds builtin-specific
knowledge to `luarocks.deps`, but I don't think any other
build backends will support this behavior any time soon.
---
 src/luarocks/build/builtin.lua | 32 ++++++++++++++++++++++++++++++++
 src/luarocks/deps.lua          |  4 ++++
 2 files changed, 36 insertions(+)

(limited to 'src')

diff --git a/src/luarocks/build/builtin.lua b/src/luarocks/build/builtin.lua
index 4ff59f8b..f414c166 100644
--- a/src/luarocks/build/builtin.lua
+++ b/src/luarocks/build/builtin.lua
@@ -10,6 +10,38 @@ local util = require("luarocks.util")
 local cfg = require("luarocks.core.cfg")
 local dir = require("luarocks.dir")
 
+function builtin.autodetect_external_dependencies(build)
+   if not build or not build.modules then
+      return nil
+   end
+   local extdeps = {}
+   local any = false
+   for _, data in pairs(build.modules) do
+      if type(data) == "table" and data.libraries then
+         local libraries = data.libraries
+         if type(libraries) == "string" then
+            libraries = { libraries }
+         end
+         local incdirs = {}
+         local libdirs = {}
+         for _, lib in ipairs(libraries) do
+            local upper = lib:upper()
+            any = true
+            extdeps[upper] = { library = lib }
+            table.insert(incdirs, "$(" .. upper .. "_INCDIR)")
+            table.insert(libdirs, "$(" .. upper .. "_LIBDIR)")
+         end
+         if not data.incdirs then
+            data.incdirs = incdirs
+         end
+         if not data.libdirs then
+            data.libdirs = libdirs
+         end
+      end
+   end
+   return any and extdeps or nil
+end
+
 local function autoextract_libs(external_dependencies, variables)
    if not external_dependencies then
       return nil, nil, nil
diff --git a/src/luarocks/deps.lua b/src/luarocks/deps.lua
index 3ec1aa93..bcd6ccf5 100644
--- a/src/luarocks/deps.lua
+++ b/src/luarocks/deps.lua
@@ -9,6 +9,7 @@ local dir = require("luarocks.dir")
 local util = require("luarocks.util")
 local vers = require("luarocks.core.vers")
 local queries = require("luarocks.queries")
+local builtin = require("luarocks.build.builtin")
 
 --- Attempt to match a dependency to an installed rock.
 -- @param dep table: A dependency parsed in table format.
@@ -277,6 +278,9 @@ function deps.check_external_deps(rockspec, mode)
       patterns = cfg.runtime_external_deps_patterns
       subdirs = cfg.runtime_external_deps_subdirs
    end
+   if not rockspec.external_dependencies then
+      rockspec.external_dependencies = builtin.autodetect_external_dependencies(rockspec.build)
+   end
    if rockspec.external_dependencies then
       for name, ext_files in util.sortedpairs(rockspec.external_dependencies) do
          local ok = true
-- 
cgit v1.2.3-55-g6feb