[Patch v3 1/8] crypto: refactor context creation to facilitate further work

diff --git a/e6/c4d9020a551ad877ce7c8078df5834699a5763 b/e6/c4d9020a551ad877ce7c8078df5834699a5763
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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v3 1/8] crypto: refactor context creation to facilitate\r
+ further work\r
+Date: Mon, 14 Dec 2015 09:38:50 -0400\r
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+From: Jani Nikula <jani@nikula.org>\r
+\r
+Let the context creation functions decide how to handle multiple calls\r
+and cache the crypto context. No functional changes.\r
+---\r
+ crypto.c | 19 ++++++++++---------\r
+ 1 file changed, 10 insertions(+), 9 deletions(-)\r
+\r
+diff --git a/crypto.c b/crypto.c\r
+index a6eb27d..1187ad7 100644\r
+--- a/crypto.c\r
++++ b/crypto.c\r
+@@ -22,14 +22,20 @@\r
+ \r
+ /* Create a GPG context (GMime 2.6) */\r
+ static notmuch_crypto_context_t *\r
+-create_gpg_context (const char *gpgpath)\r
++create_gpg_context (notmuch_crypto_t *crypto)\r
+ {\r
+     notmuch_crypto_context_t *gpgctx;\r
+ \r
++    if (crypto->gpgctx)\r
++      return crypto->gpgctx;\r
++\r
+     /* TODO: GMimePasswordRequestFunc */\r
+-    gpgctx = g_mime_gpg_context_new (NULL, gpgpath ? gpgpath : "gpg");\r
+-    if (! gpgctx)\r
++    gpgctx = g_mime_gpg_context_new (NULL, crypto->gpgpath ? crypto->gpgpath : "gpg");\r
++    if (! gpgctx) {\r
++      fprintf (stderr, "Failed to construct gpg context.\n");\r
+       return NULL;\r
++    }\r
++    crypto->gpgctx = gpgctx;\r
+ \r
+     g_mime_gpg_context_set_use_agent ((GMimeGpgContext *) gpgctx, TRUE);\r
+     g_mime_gpg_context_set_always_trust ((GMimeGpgContext *) gpgctx, FALSE);\r
+@@ -57,12 +63,7 @@ notmuch_crypto_get_context (notmuch_crypto_t *crypto, const char *protocol)\r
+      */\r
+     if (strcasecmp (protocol, "application/pgp-signature") == 0 ||\r
+       strcasecmp (protocol, "application/pgp-encrypted") == 0) {\r
+-      if (! crypto->gpgctx) {\r
+-          crypto->gpgctx = create_gpg_context (crypto->gpgpath);\r
+-          if (! crypto->gpgctx)\r
+-              fprintf (stderr, "Failed to construct gpg context.\n");\r
+-      }\r
+-      cryptoctx = crypto->gpgctx;\r
++      cryptoctx = create_gpg_context (crypto);\r
+     } else {\r
+       fprintf (stderr, "Unknown or unsupported cryptographic protocol.\n");\r
+     }\r
+-- \r
+2.6.2\r
+\r