1 files changed, 66 insertions, 0 deletions
diff --git a/lib/Carton/Environment.pm b/lib/Carton/Environment.pm
new file mode 100644
index 0000000..af39f4d
--- /dev/null
+++ b/lib/Carton/Environment.pm
@@ -0,0 +1,66 @@
+package Carton::Environment;
+use strict;
+use Moo;
+
+use Carton::Error;
+use Path::Tiny;
+
+has cpanfile => (is => 'rw');
+has lockfile => (is => 'lazy');
+has install_path => (is => 'lazy');
+has vendor_cache  => (is => 'lazy');
+
+sub _build_lockfile {
+    my $self = shift;
+    Path::Tiny->new($self->cpanfile->dirname . "/carton.lock");
+}
+
+sub _build_install_path {
+    my $self = shift;
+    if ($ENV{PERL_CARTON_PATH}) {
+        return Path::Tiny->new($ENV{PERL_CARTON_PATH})->absolute;
+    } else {
+        return Path::Tiny->new($self->cpanfile->dirname . "/local");
+    }
+}
+
+sub _build_vendor_cache {
+    my $self = shift;
+    Path::Tiny->new($self->install_path->dirname . "/vendor/cache");
+}
+
+sub build {
+    my $class = shift;
+
+    my $self = $class->new;
+
+    if (my $cpanfile = $self->locate_cpanfile) {
+        $self->cpanfile($cpanfile);
+    } else {
+        Carton::Error::CPANfileNotFound->throw(error => "Can't locate cpanfile");
+    }
+
+    $self;
+}
+
+sub locate_cpanfile {
+    my $self = shift;
+
+    my $current  = Path::Tiny->cwd;
+    my $previous = '';
+
+    until ($current eq '/' or $current eq $previous) {
+        # TODO support PERL_CARTON_CPANFILE
+        my $try = $current->child('cpanfile');
+        if ($try->exists) {
+            return $try->absolute;
+        }
+
+        ($previous, $current) = ($current, $current->parent);
+    }
+
+    return;
+}
+
+1;
+