[PATCH v2 07/16] create a notmuch_indexopts_t index options object

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

This is currently mostly a wrapper around _notmuch_crypto_t that keeps
its internals private and doesn't expose any of the GMime API.
However, non-crypto indexing options might also be added later to
indexopts (e.g. filters or other transformations).
---
 lib/Makefile.local    |  1 +
 lib/indexopts.c       | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/notmuch-private.h |  7 +++++
 lib/notmuch.h         | 63 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 143 insertions(+)
 create mode 100644 lib/indexopts.c

diff --git a/lib/Makefile.local b/lib/Makefile.local
index 3a07090..1652b1b 100644
--- a/lib/Makefile.local
+++ b/lib/Makefile.local
@@ -39,6 +39,7 @@ libnotmuch_c_srcs =		\
 	$(dir)/message-file.c	\
 	$(dir)/messages.c	\
 	$(dir)/sha1.c		\
+	$(dir)/indexopts.c	\
 	$(dir)/tags.c
 
 libnotmuch_cxx_srcs =		\
diff --git a/lib/indexopts.c b/lib/indexopts.c
new file mode 100644
index 0000000..da36e2b
--- /dev/null
+++ b/lib/indexopts.c
@@ -0,0 +1,72 @@
+/* indexopts.c - options for indexing messages
+ *
+ * Copyright © 2015 Daniel Kahn Gillmor
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see http://www.gnu.org/licenses/ .
+ *
+ * Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ */
+
+#include "notmuch-private.h"
+
+notmuch_indexopts_t *
+notmuch_indexopts_create ()
+{
+    notmuch_indexopts_t *ret;
+    
+    ret = talloc_zero (NULL, notmuch_indexopts_t);
+
+    return ret;
+}
+
+notmuch_status_t
+notmuch_indexopts_set_try_decrypt (notmuch_indexopts_t *indexopts,
+				   notmuch_bool_t try_decrypt)
+{
+    if (!indexopts)
+	return NOTMUCH_STATUS_NULL_POINTER;
+    indexopts->crypto.decrypt = try_decrypt;
+    return NOTMUCH_STATUS_SUCCESS;
+}
+
+notmuch_bool_t
+notmuch_indexopts_get_try_decrypt (const notmuch_indexopts_t *indexopts)
+{
+    if (!indexopts)
+	return FALSE;
+    return indexopts->crypto.decrypt;
+}
+
+notmuch_status_t
+notmuch_indexopts_set_gpg_path (notmuch_indexopts_t *indexopts,
+				const char *gpg_path)
+{
+    if (!indexopts)
+	return NOTMUCH_STATUS_NULL_POINTER;
+    return _notmuch_crypto_set_gpg_path (&(indexopts->crypto), gpg_path);
+}
+
+const char*
+notmuch_indexopts_get_gpg_path (const notmuch_indexopts_t *indexopts)
+{
+    if (!indexopts)
+	return NULL;
+    return _notmuch_crypto_get_gpg_path (&(indexopts->crypto));
+}
+
+void
+notmuch_indexopts_destroy (notmuch_indexopts_t *indexopts)
+{
+    talloc_free (indexopts);
+}
diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 5dd4770..e9c1e8a 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -51,6 +51,7 @@ NOTMUCH_BEGIN_DECLS
 #include "xutil.h"
 #include "error_util.h"
 #include "string-util.h"
+#include "crypto.h"
 
 #pragma GCC visibility push(hidden)
 
@@ -544,6 +545,12 @@ _notmuch_thread_create (void *ctx,
 			notmuch_exclude_t omit_exclude,
 			notmuch_sort_t sort);
 
+/* indexopts.c */
+
+typedef struct _notmuch_indexopts {
+    _notmuch_crypto_t crypto;
+} notmuch_indexopts_t;
+
 NOTMUCH_END_DECLS
 
 #ifdef __cplusplus
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 00002f1..3679c54 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -214,6 +214,7 @@ typedef struct _notmuch_message notmuch_message_t;
 typedef struct _notmuch_tags notmuch_tags_t;
 typedef struct _notmuch_directory notmuch_directory_t;
 typedef struct _notmuch_filenames notmuch_filenames_t;
+typedef struct _notmuch_indexopts notmuch_indexopts_t;
 #endif /* __DOXYGEN__ */
 
 /**
@@ -1846,6 +1847,68 @@ notmuch_filenames_move_to_next (notmuch_filenames_t *filenames);
 void
 notmuch_filenames_destroy (notmuch_filenames_t *filenames);
 
+/**
+ * Create a notmuch_indexopts_t object.
+ *
+ * This object describes options on how indexing can happen when a
+ * message is added to the index.
+ */
+notmuch_indexopts_t *
+notmuch_indexopts_create ();
+
+/**
+ * Specify whether to decrypt encrypted parts while indexing.
+ * 
+ * Be aware that the index is likely sufficient to reconstruct the
+ * cleartext of the message itself, so please ensure that the notmuch
+ * message index is adequately protected. DO NOT SET THIS FLAG TO TRUE
+ * without considering the security of your index.
+ *
+ */
+notmuch_status_t
+notmuch_indexopts_set_try_decrypt (notmuch_indexopts_t *indexopts,
+				   notmuch_bool_t try_decrypt);
+
+/**
+ * Return whether to decrypt encrypted parts while indexing.
+ * see notmuch_indexopts_set_try_decrypt.
+ */
+notmuch_bool_t
+notmuch_indexopts_get_try_decrypt (const notmuch_indexopts_t *indexopts);
+
+/**
+ * Specify the name (or name and path) of the gpg executable, in case
+ * GnuPG needs to be used during indexing.  The default should usually
+ * be fine.
+ * 
+ * Passing NULL to this will reset it to the default.
+ * 
+ * Return value:
+ *
+ * NOTMUCH_STATUS_SUCCESS: the path was accepted and will be used.
+ * 
+ * NOTMUCH_STATUS_FILE_ERROR: the path given either wasn't found or
+ *      wasn't executable.
+ */
+notmuch_status_t
+notmuch_indexopts_set_gpg_path (notmuch_indexopts_t *indexopts,
+				const char *gpg_path);
+
+/**
+ * Return the name (possibly including path) of the gpg executable to
+ * be used in case GnuPG needs to be used during indexing.
+ * 
+ * see notmuch_indexopts_set_gpg_path
+ */
+const char*
+notmuch_indexopts_get_gpg_path (const notmuch_indexopts_t *indexopts);
+
+/**
+ * Destroy a notmuch_indexopts_t object.
+ */
+void
+notmuch_indexopts_destroy (notmuch_indexopts_t *options);
+
 /* @} */
 
 NOTMUCH_END_DECLS
-- 
2.7.0.rc3