[PATCH 1/2] Add 'cat' subcommand

[Michal Sojka]

This command dumps a raw message identified by a filename to the
standard output. It allows MUAs to access the messages for piping,
attachment manipulation, etc. in the same way as it is done in
notmuch-show-mode (through notmuch show subcommand). This will simplify
the MUAs when they need to operate with a remote database.

Signed-off-by: Michal Sojka <sojkam1 at fel.cvut.cz>
---
 NEWS             |    3 +++
 notmuch-client.h |    3 +++
 notmuch-show.c   |   39 +++++++++++++++++++++++++++++++++++++++
 notmuch.c        |    4 ++++
 4 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/NEWS b/NEWS
index eba0fd5..1a81e64 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+A new subcommand 'cat' was added, which simplifies use of Emacs
+interface with remote database (accessed over SSH).
+
 Notmuch 0.2 (2010-04-16)
 ========================
 This is the second release of the notmuch mail system, with actual
diff --git a/notmuch-client.h b/notmuch-client.h
index d36b9ec..0efc41c 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -111,6 +111,9 @@ int
 notmuch_search_tags_command (void *ctx, int argc, char *argv[]);
 
 int
+notmuch_cat_command (void *ctx, int argc, char *argv[]);
+
+int
 notmuch_part_command (void *ctx, int argc, char *argv[]);
 
 const char *
diff --git a/notmuch-show.c b/notmuch-show.c
index 76873a1..bade9bb 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -504,6 +504,45 @@ notmuch_show_command (void *ctx, unused (int argc), unused (char *argv[]))
 }
 
 int
+notmuch_cat_command (void *ctx, unused (int argc), unused (char *argv[]))
+{
+    int i;
+    FILE *file;
+    const char *filename;
+    size_t size;
+    char buf[4096];
+
+    (void)ctx;
+
+    for (i = 0; i < argc && argv[i][0] == '-'; i++) {
+	fprintf (stderr, "Unrecognized option: %s\n", argv[i]);
+	return 1;
+    }
+
+    argc -= i;
+    argv += i;
+
+    if (argc == 0) {
+	fprintf (stderr, "Error: No filename given\n");
+	return 1;
+    }
+    filename = argv[0];
+
+    file = fopen (filename, "r");
+    if (file == NULL) {
+	fprintf (stderr, "Error: Cannot open %s: %s\n", filename, strerror (errno));
+	return 1;
+    }
+    while  (!feof (file)) {
+	size = fread(buf, 1, sizeof(buf), file);
+	fwrite (buf, size, 1, stdout);
+    }
+    fclose (file);
+
+    return 0;
+}
+
+int
 notmuch_part_command (void *ctx, unused (int argc), unused (char *argv[]))
 {
 	notmuch_config_t *config;
diff --git a/notmuch.c b/notmuch.c
index 0eea5e1..477d746 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -296,6 +296,10 @@ command_t commands[] = {
       "\tcontain tags only from messages that match the search-term(s).\n"
       "\n"
       "\tIn both cases the list will be alphabetically sorted." },
+    { "cat", notmuch_cat_command,
+      "<path>",
+      "Dump raw message identified by path to standard output.",
+      "" },
     { "part", notmuch_part_command,
       "--part=<num> <search-terms>",
       "Output a single MIME part of a message.",
-- 
1.7.0.4