Native temp file and dir facilities

Fixes #934

CHANGELOG.md

@@ -5,6 +5,9 @@ All notable changes to this project will be documented in this file. This change
 ### Fixed
 - `tty?` spec refers to `planck.core/IWriter` ([#928](https://github.com/planck-repl/planck/issues/928))
 
+### Added
+- Native temp file and dir facilities ([#934](https://github.com/planck-repl/planck/issues/934)
+
 ## [2.23.0] - 2019-05-19
 ### Added
 - Add `planck.io/tty?` ([#911](https://github.com/planck-repl/planck/issues/911))

planck-c/engine.c

@@ -506,6 +506,8 @@ void *do_engine_init(void *data) {
 
     register_global_function(ctx, "PLANCK_FSTAT", function_fstat);
 
+    register_global_function(ctx, "PLANCK_MKTEMP", function_mktemp);
+
     register_global_function(ctx, "PLANCK_REQUEST", function_http_request);
 
     register_global_function(ctx, "PLANCK_READ_PASSWORD", function_read_password);

planck-c/functions.c

@@ -1030,6 +1030,43 @@ JSValueRef function_list_files(JSContextRef ctx, JSObjectRef function, JSObjectR
     return JSValueMakeNull(ctx);
 }
 
+JSValueRef function_mktemp(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
+                           size_t argc, const JSValueRef args[], JSValueRef *exception) {
+    if (argc == 1
+        && JSValueGetType(ctx, args[0]) == kJSTypeBoolean) {
+
+        bool directory = JSValueToBoolean(ctx, args[0]);
+
+        char* tmpdir = getenv("TMPDIR");
+        if (!tmpdir) {
+            tmpdir = "/tmp";
+        }
+
+        char template[PATH_MAX];
+        if (str_has_suffix(tmpdir, "/") == 0) {
+            snprintf(template, PATH_MAX, "%splanck.XXXXXX", tmpdir);
+        } else {
+            snprintf(template, PATH_MAX, "%s/planck.XXXXXX", tmpdir);
+        }
+
+        char *temp_name;
+        if (directory) {
+            temp_name = mkdtemp(template);
+        } else {
+            temp_name = mktemp(template);
+        }
+
+        if (temp_name) {
+            return c_string_to_value(ctx, temp_name);
+        } else {
+            JSValueRef arguments[1];
+            arguments[0] = c_string_to_value(ctx, strerror(errno));
+            *exception = JSObjectMakeError(ctx, 1, arguments, NULL);
+        }
+
+    }
+    return JSValueMakeNull(ctx);
+}
 
 JSValueRef function_is_directory(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
                                  size_t argc, const JSValueRef args[], JSValueRef *exception) {

planck-c/functions.h

@@ -117,6 +117,9 @@ JSValueRef function_copy_file(JSContextRef ctx, JSObjectRef function, JSObjectRe
 JSValueRef function_list_files(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argc,
                                const JSValueRef args[], JSValueRef *exception);
 
+JSValueRef function_mktemp(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
+                           size_t argc, const JSValueRef args[], JSValueRef *exception);
+
 JSValueRef function_is_directory(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argc,
                                  const JSValueRef args[], JSValueRef *exception);
 

planck-cljs/src/planck/io.cljs

@@ -417,6 +417,29 @@
   :args (s/cat :dir (s/or :string string? :file file?))
   :ret (s/coll-of file?))
 
+(defn temp-file
+  "Returns a temporary file as a [[File]].
+
+  The path name is guaranteed to be unique at the time of the the call, and
+  the file will not be created on disk."
+  []
+  (as-file (js/PLANCK_MKTEMP false)))
+
+(s/fdef temp-file
+  :args (s/cat)
+  :ret file?)
+
+(defn temp-directory
+  "Returns a temporary directory as a [[File]].
+
+  The directory will be created on disk with mode 0700."
+  []
+  (as-file (js/PLANCK_MKTEMP true)))
+
+(s/fdef temp-directory
+  :args (s/cat)
+  :ret file?)
+
 (defn resource
   "Returns the URI for the named resource, `n`.
   

planck-cljs/test/planck/io_test.cljs

@@ -216,3 +216,10 @@
   (is (nil? (io/list-files "/bogus/path")))
   (is (seq? (io/list-files "/tmp")))
   (is (io/file? (first (io/list-files "/tmp")))))
+
+(deftest temp-file-test
+  (is (io/file? (io/temp-file))))
+
+(deftest temp-directory-test
+  (is (io/file? (io/temp-directory)))
+  (is (io/directory? (io/temp-directory))))