[Patch v2 09/17] tag-util.[ch]: New files for common tagging routines
Mark Walters
markwalters1009 at gmail.com
Sun Nov 25 14:19:57 PST 2012
This looks good. A couple of typos and a small queries (and I
agree with Tomi but I think you have already included that).
On Sat, 24 Nov 2012, david at tethera.net wrote:
> From: David Bremner <bremner at debian.org>
>
> These are meant to be shared between notmuch-tag and notmuch-restore.
>
> The bulk of the routines implement a "tag operation list" abstract
> data type act as a structured representation of a set of tag
> operations (typically coming from a single tag command or line of
> input).
> ---
> Makefile.local | 1 +
> tag-util.c | 264 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> tag-util.h | 120 ++++++++++++++++++++++++++
> 3 files changed, 385 insertions(+)
> create mode 100644 tag-util.c
> create mode 100644 tag-util.h
>
> diff --git a/Makefile.local b/Makefile.local
> index 2b91946..854867d 100644
> --- a/Makefile.local
> +++ b/Makefile.local
> @@ -274,6 +274,7 @@ notmuch_client_srcs = \
> query-string.c \
> mime-node.c \
> crypto.c \
> + tag-util.c
>
> notmuch_client_modules = $(notmuch_client_srcs:.c=.o)
>
> diff --git a/tag-util.c b/tag-util.c
> new file mode 100644
> index 0000000..287cc67
> --- /dev/null
> +++ b/tag-util.c
> @@ -0,0 +1,264 @@
> +#include "string-util.h"
> +#include "tag-util.h"
> +#include "hex-escape.h"
> +
> +struct _tag_operation_t {
> + const char *tag;
> + notmuch_bool_t remove;
> +};
> +
> +struct _tag_op_list_t {
> + tag_operation_t *ops;
> + int count;
> + int size;
> +};
> +
> +int
> +parse_tag_line (void *ctx, char *line,
> + tag_op_flag_t flags,
> + char **query_string,
> + tag_op_list_t *tag_ops)
> +{
> + char *tok = line;
> + size_t tok_len = 0;
> +
> + chomp_newline (line);
> +
> + /* remove leading space */
> + while (*tok == ' ' || *tok == '\t')
> + tok++;
> +
> + /* Skip empty and comment lines. */
> + if (*tok == '\0' || *tok == '#')
> + return 1;
> +
> + tag_op_list_reset (tag_ops);
> +
> + /* Parse tags. */
> + while ((tok = strtok_len (tok + tok_len, " ", &tok_len)) != NULL) {
> + notmuch_bool_t remove;
> + char *tag;
> +
> + /* Optional explicit end of tags marker. */
> + if (strncmp (tok, "--", tok_len) == 0) {
> + tok = strtok_len (tok + tok_len, " ", &tok_len);
> + break;
> + }
> +
> + /* Implicit end of tags. */
> + if (*tok != '-' && *tok != '+')
> + break;
> +
> + /* If tag is terminated by NUL, there's no query string. */
> + if (*(tok + tok_len) == '\0') {
> + tok = NULL;
> + break;
> + }
> +
> + /* Terminate, and start next token after terminator. */
> + *(tok + tok_len++) = '\0';
> +
> + remove = (*tok == '-');
> + tag = tok + 1;
> +
> + /* Maybe refuse empty tags. */
> + if (!(flags & TAG_FLAG_BE_GENEROUS) && *tag == '\0') {
> + tok = NULL;
> + break;
> + }
> +
> + /* Decode tag. */
> + if (hex_decode_inplace (tag) != HEX_SUCCESS) {
> + tok = NULL;
> + break;
> + }
> +
> + if (tag_op_list_append (ctx, tag_ops, tag, remove))
> + return -1;
> + }
> +
> + if (tok == NULL || tag_ops->count == 0) {
> + /* FIXME: line has been modified! */
> + fprintf (stderr, "Warning: Ignoring invalid input line: %s\n",
> + line);
> + return 1;
> + }
> +
> + /* tok now points to the query string */
> + if (hex_decode_inplace (tok) != HEX_SUCCESS) {
> + /* FIXME: line has been modified! */
> + fprintf (stderr, "Warning: Ignoring invalid input line: %s\n",
> + line);
> + return 1;
> + }
> +
> + *query_string = tok;
> +
> + return 0;
> +}
> +
> +static inline void
> +message_error (notmuch_message_t *message,
> + notmuch_status_t status,
> + const char *format, ...)
> +{
> + va_list va_args;
> +
> + va_start (va_args, format);
> +
> + vfprintf (stderr, format, va_args);
> + fprintf (stderr, "Message-ID: %s\n", notmuch_message_get_message_id (message));
> + fprintf (stderr, "Status: %s\n", notmuch_status_to_string (status));
> +}
> +
> +notmuch_status_t
> +tag_op_list_apply (notmuch_message_t *message,
> + tag_op_list_t *list,
> + tag_op_flag_t flags)
> +{
> + int i;
> +
> + notmuch_status_t status = 0;
> + tag_operation_t *tag_ops = list->ops;
> +
> + status = notmuch_message_freeze (message);
> + if (status) {
> + message_error (message, status, "freezing message");
> + return status;
> + }
> +
> + if (flags & TAG_FLAG_REMOVE_ALL) {
> + status = notmuch_message_remove_all_tags (message);
> + if (status) {
> + message_error (message, status, "removing all tags" );
> + return status;
> + }
> + }
> +
> + for (i = 0; i < list->count; i++) {
> + if (tag_ops[i].remove) {
> + status = notmuch_message_remove_tag (message, tag_ops[i].tag);
> + if (status) {
> + message_error (message, status, "removing tag %s", tag_ops[i].tag);
> + return status;
> + }
> + } else {
> + status = notmuch_message_add_tag (message, tag_ops[i].tag);
> + if (status) {
> + message_error (message, status, "adding tag %s", tag_ops[i].tag);
> + return status;
> + }
> +
> + }
> + }
> +
> + status = notmuch_message_thaw (message);
I don't know how freeze/thaw work but does it matter that you don't thaw
when there is an error?
> + if (status) {
> + message_error (message, status, "thawing message");
> + return status;
> + }
> +
> +
> + if (flags & TAG_FLAG_MAILDIR_SYNC) {
> + status = notmuch_message_tags_to_maildir_flags (message);
> + if (status) {
> + message_error (message, status, "synching tags to maildir");
> + return status;
> + }
> + }
> +
> + return NOTMUCH_STATUS_SUCCESS;
> +
> +}
> +
> +
> +/* Array of tagging operations (add or remove), terminated with an
> + * empty element. Size will be increased as necessary. */
> +
> +tag_op_list_t *
> +tag_op_list_create (void *ctx)
> +{
> + tag_op_list_t *list;
> +
> + list = talloc (ctx, tag_op_list_t);
> + if (list == NULL)
> + return NULL;
> +
> + list->size = TAG_OP_LIST_INITIAL_SIZE;
> + list->count = 0;
> +
> + list->ops = talloc_array (ctx, tag_operation_t, list->size);
> + if (list->ops == NULL)
> + return NULL;
> +
> + return list;
> +}
> +
> +
> +int
> +tag_op_list_append (void *ctx,
> + tag_op_list_t *list,
> + const char *tag,
> + notmuch_bool_t remove)
> +{
> + /* Make room if current array is full. This should be a fairly
> + * rare case, considering the initial array size.
> + */
> +
> + if (list->count == list->size) {
> + list->size *= 2;
> + list->ops = talloc_realloc (ctx, list->ops, tag_operation_t,
> + list->size);
> + if (list->ops == NULL) {
> + fprintf (stderr, "Out of memory.\n");
> + return 1;
> + }
> + }
> +
> + /* add the new operation */
> +
> + list->ops[list->count].tag = tag;
> + list->ops[list->count].remove = remove;
> + list->count++;
> + return 0;
> +}
> +
> +/*
> + * Is the i'th tag operation a remove?
> + */
> +
> +notmuch_bool_t
> +tag_op_list_isremove (const tag_op_list_t *list, size_t i)
> +{
> + return list->ops[i].remove;
> +}
> +
> +/*
> + * Reset a list to contain no operations
> + */
> +
> +void
> +tag_op_list_reset (tag_op_list_t *list)
> +{
> + list->count = 0;
> +}
> +
> +/*
> + * Return the number of operations in a list
> + */
> +
> +size_t
> +tag_op_list_size (const tag_op_list_t *list)
> +{
> + return list->count;
> +}
> +
> +/*
> + * return the i'th tag in the list
> + */
> +
> +const char *
> +tag_op_list_tag (const tag_op_list_t *list, size_t i)
> +{
> + return list->ops[i].tag;
> +}
> diff --git a/tag-util.h b/tag-util.h
> new file mode 100644
> index 0000000..508806f
> --- /dev/null
> +++ b/tag-util.h
> @@ -0,0 +1,120 @@
> +#ifndef _TAG_UTIL_H
> +#define _TAG_UTIL_H
> +
> +#include "notmuch-client.h"
> +
> +typedef struct _tag_operation_t tag_operation_t;
> +typedef struct _tag_op_list_t tag_op_list_t;
> +
> +#define TAG_OP_LIST_INITIAL_SIZE 10
> +
> +/* Use powers of 2 */
> +typedef enum { TAG_FLAG_NONE = 0,
> + /* Operations are synced to maildir, if possible */
> +
> + TAG_FLAG_MAILDIR_SYNC = 1,
> +
> + /* Remove all tags from message before applying
> + * list */
> +
> + TAG_FLAG_REMOVE_ALL = 2,
> +
> + /* Don't try to avoid database operations. Useful
> + * when we know that message passed needs these
> + * operations. */
> +
> + TAG_FLAG_PRE_OPTIMIZED = 4,
> +
> + /* Accept strange tags that might be user error;
> + intended for use by notmuch-restore.
> + */
> +
> + TAG_FLAG_BE_GENEROUS = 8} tag_op_flag_t;
> +
> +/* Parse a string of the following format:
> + *
> + * +<tag>|-<tag> [...] [--] <search-terms>
> + *
> + * Each line is interpreted similarly to "notmuch tag" command line
> + * arguments. The delimiter is one or more spaces ' '. Any characters
> + * in <tag> and <search-terms> MAY be hex encoded with %NN where NN is
> + * the hexadecimal value of the character. Any ' ' and '%' characters
> + * in <tag> and <search-terms> MUST be hex encoded (using %20 and %25,
> + * respectively). Any characters that are not part of <tag> or
> + * <search-terms> MUST NOT be hex encoded.
> + *
> + * Leading and trailing space ' ' is ignored. Empty lines and lines
> + * beginning with '#' are ignored.
> + *
> + * Returns: 0 for OK, 1 for skipped line, -1 for fatal(ish) error.
> + *
> + * Output Parameters:
> + * ops contains a list of tag operations
> + * query_str the search terms.
> + */
> +int
> +parse_tag_line (void *ctx, char *line,
> + tag_op_flag_t flags,
> + char **query_str, tag_op_list_t *ops);
> +
> +/*
> + * Create an empty list of tag operations
> + *
> + * ctx is passed to talloc
> + */
> +
> +tag_op_list_t
> +*tag_op_list_create (void *ctx);
> +
> +/*
> + * Add a tag operation (delete iff remote == TRUE) to a list.
> + * The list is expanded as necessary.
> + */
Typo s/remote/remove/
> +int
> +tag_op_list_append (void *ctx,
> + tag_op_list_t *list,
> + const char *tag,
> + notmuch_bool_t remove);
> +
> +/*
> + * Apply a list of tag operations, in order to a message.
I found the comment awkward to parse: as "in order to <do something>"
Best wishes
Mark
> + *
> + * Flags can be bitwise ORed; see enum above for possibilies.
> + */
> +
> +notmuch_status_t
> +tag_op_list_apply (notmuch_message_t *message,
> + tag_op_list_t *tag_ops,
> + tag_op_flag_t flags);
> +
> +/*
> + * Return the number of operations in a list
> + */
> +
> +size_t
> +tag_op_list_size (const tag_op_list_t *list);
> +
> +/*
> + * Reset a list to contain no operations
> + */
> +
> +void
> +tag_op_list_reset (tag_op_list_t *list);
> +
> +
> + /*
> + * return the i'th tag in the list
> + */
> +
> +const char *
> +tag_op_list_tag (const tag_op_list_t *list, size_t i);
> +
> +/*
> + * Is the i'th tag operation a remove?
> + */
> +
> +notmuch_bool_t
> +tag_op_list_isremove (const tag_op_list_t *list, size_t i);
> +
> +#endif
> --
> 1.7.10.4
>
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