Add R/CRAN support.

README.md

@@ -55,6 +55,7 @@ issues (or lack of support for a particular ecosystem), please file a bug.
     - Module::Build::Tiny
 - PHP Pear
 - Python - setup.py/setup.cfg/pyproject.toml
+- R
 - Ruby gems
 - Waf
 
@@ -69,6 +70,7 @@ The following "native" repositories are supported:
 - hackage
 - npm
 - cargo
+- cran
 - golang\*
 
 As well one distribution repository:

ognibuild/buildsystem.py

@@ -363,6 +363,28 @@ class Gradle(BuildSystem):
             session, [self.executable, "installDist"], fixers)
 
 
+class R(BuildSystem):
+
+    name = "R"
+
+    def __init__(self, path):
+        self.path = path
+
+    def __repr__(self):
+        return "%s(%r)" % (type(self).__name__, self.path)
+
+    def build(self, session, resolver, fixers):
+        run_with_build_fixers(session, ["R", "CMD", "build", "."], fixers)
+
+    def test(self, session, resolver, fixers):
+        run_with_build_fixers(session, ["R", "CMD", "test", "."], fixers)
+
+    @classmethod
+    def probe(cls, path):
+        if os.path.exists(os.path.join(path, 'DESCRIPTION')):
+            return cls(path)
+
+
 class Meson(BuildSystem):
 
     name = "meson"
@@ -868,7 +890,7 @@ class PerlBuildTiny(BuildSystem):
 
 BUILDSYSTEM_CLSES = [
     Pear, SetupPy, Npm, Waf, Cargo, Meson, Cabal, Gradle, Maven,
-    DistInkt, Gem, Make, PerlBuildTiny, Golang]
+    DistInkt, Gem, Make, PerlBuildTiny, Golang, R]
 
 
 def detect_buildsystems(path, trust_package=False):

ognibuild/resolver/__init__.py

@@ -76,6 +76,44 @@ class CPANResolver(Resolver):
             raise UnsatisfiedRequirements(missing)
 
 
+class CRANResolver(Resolver):
+    def __init__(self, session, repos='"http://cran.r-project.org'):
+        self.session = session
+        self.repos = repos
+
+    def __str__(self):
+        return "cran"
+
+    def __repr__(self):
+        return "%s(%r, %r)" % (type(self).__name__, self.session, self.repos)
+
+    def _cmd(self, req):
+        return ["R", "-e", "install.packages('%s', repos=%r)" % (req.package, self.repos)]
+
+    def explain(self, requirements):
+        from ..requirements import RPackageRequirement
+
+        rreqs = []
+        for requirement in requirements:
+            if not isinstance(requirement, RPackageRequirement):
+                continue
+            rreqs.append(requirement)
+        if rreqs:
+            yield ([self._cmd(req) for req in rreqs])
+
+    def install(self, requirements):
+        from ..requirements import RPackageRequirement
+
+        missing = []
+        for requirement in requirements:
+            if not isinstance(requirement, RPackageRequirement):
+                missing.append(requirement)
+                continue
+            self.session.check_call(self._cmd(requirement))
+        if missing:
+            raise UnsatisfiedRequirements(missing)
+
+
 class HackageResolver(Resolver):
     def __init__(self, session):
         self.session = session
@@ -268,6 +306,7 @@ NATIVE_RESOLVER_CLS = [
     NpmResolver,
     GoResolver,
     HackageResolver,
+    CRANResolver,
     ]