Hi Mark,

I mostly agree with your points mentioned in this and other your emails.
I'll prepare v4 based on that.

On Wed, Oct 22 2014, Mark Walters wrote:
> On Sun, 12 Oct 2014, Michal Sojka <sojk...@fel.cvut.cz> wrote:
>> The new outputs allow printing senders, recipients or both of matching
>> messages. The --output option is converted from "keyword" argument to
>> "flags" argument, which means that the user can use --output=sender and
>> --output=recipients simultaneously, to print both. Other combinations
>> produce an error.
>>
>> This code based on a patch from Jani Nikula.
>> ---
>>  completion/notmuch-completion.bash |   2 +-
>>  completion/notmuch-completion.zsh  |   3 +-
>>  doc/man1/notmuch-search.rst        |  22 +++++++-
>>  notmuch-search.c                   | 110 
>> ++++++++++++++++++++++++++++++++++---
>>  test/T090-search-output.sh         |  64 +++++++++++++++++++++
>>  5 files changed, 189 insertions(+), 12 deletions(-)
>>
>> diff --git a/completion/notmuch-completion.bash 
>> b/completion/notmuch-completion.bash
>> index 0571dc9..cfbd389 100644
>> --- a/completion/notmuch-completion.bash
>> +++ b/completion/notmuch-completion.bash
>> @@ -294,7 +294,7 @@ _notmuch_search()
>>          return
>>          ;;
>>      --output)
>> -        COMPREPLY=( $( compgen -W "summary threads messages files tags" -- 
>> "${cur}" ) )
>> +        COMPREPLY=( $( compgen -W "summary threads messages files tags 
>> sender recipients" -- "${cur}" ) )
>>          return
>>          ;;
>>      --sort)
>> diff --git a/completion/notmuch-completion.zsh 
>> b/completion/notmuch-completion.zsh
>> index 67a9aba..3e52a00 100644
>> --- a/completion/notmuch-completion.zsh
>> +++ b/completion/notmuch-completion.zsh
>> @@ -52,7 +52,8 @@ _notmuch_search()
>>    _arguments -s : \
>>      '--max-threads=[display only the first x threads from the search 
>> results]:number of threads to show: ' \
>>      '--first=[omit the first x threads from the search results]:number of 
>> threads to omit: ' \
>> -    '--sort=[sort results]:sorting:((newest-first\:"reverse chronological 
>> order" oldest-first\:"chronological order"))'
>> +    '--sort=[sort results]:sorting:((newest-first\:"reverse chronological 
>> order" oldest-first\:"chronological order"))' \
>> +    '--output=[select what to output]:output:((summary threads messages 
>> files tags sender recipients))'
>>  }
>>
>>  _notmuch()
>> diff --git a/doc/man1/notmuch-search.rst b/doc/man1/notmuch-search.rst
>> index 90160f2..c9d38b1 100644
>> --- a/doc/man1/notmuch-search.rst
>> +++ b/doc/man1/notmuch-search.rst
>> @@ -35,7 +35,7 @@ Supported options for **search** include
>>          intended for programs that invoke **notmuch(1)** internally. If
>>          omitted, the latest supported version will be used.
>>
>> -    ``--output=(summary|threads|messages|files|tags)``
>> +    ``--output=(summary|threads|messages|files|tags|sender|recipients)``
>>
>>          **summary**
>>              Output a summary of each thread with any message matching
>> @@ -78,6 +78,26 @@ Supported options for **search** include
>>              by null characters (--format=text0), as a JSON array
>>              (--format=json), or as an S-Expression list (--format=sexp).
>>
>> +    **sender**
>> +            Output all addresses from the *From* header that appear on
>> +            any message matching the search terms, either one per line
>> +            (--format=text), separated by null characters
>> +            (--format=text0), as a JSON array (--format=json), or as
>> +            an S-Expression list (--format=sexp).
>> +
>> +        Note: Searching for **sender** should be much faster than
>> +        searching for **recipients**, because sender addresses are
>> +        cached directly in the database whereas other addresses
>> +        need to be fetched from message files.
>> +
>> +    **recipients**
>> +            Like **sender** but for addresses from *To*, *Cc* and
>> +        *Bcc* headers.
>> +
>> +    This option can be given multiple times to combine different
>> +    outputs. Curently, this is only supported for **sender** and
>> +    **recipients** outputs.
>> +
>>      ``--sort=``\ (**newest-first**\ \|\ **oldest-first**)
>>          This option can be used to present results in either
>>          chronological order (**oldest-first**) or reverse chronological
>> diff --git a/notmuch-search.c b/notmuch-search.c
>> index 5ac2a26..74588f8 100644
>> --- a/notmuch-search.c
>> +++ b/notmuch-search.c
>> @@ -23,11 +23,14 @@
>>  #include "string-util.h"
>>
>>  typedef enum {
>> -    OUTPUT_SUMMARY,
>> -    OUTPUT_THREADS,
>> -    OUTPUT_MESSAGES,
>> -    OUTPUT_FILES,
>> -    OUTPUT_TAGS
>> +    OUTPUT_SUMMARY  = 1 << 0,
>> +    OUTPUT_THREADS  = 1 << 1,
>> +    OUTPUT_MESSAGES = 1 << 2,
>> +    OUTPUT_FILES    = 1 << 3,
>> +    OUTPUT_TAGS             = 1 << 4,
>> +    OUTPUT_SENDER   = 1 << 5,
>> +    OUTPUT_RECIPIENTS       = 1 << 6,
>> +    OUTPUT_ADDRESSES        = OUTPUT_SENDER | OUTPUT_RECIPIENTS,
>
> I think I would drop the OUTPUT_ADDRESSES enum as the parser no longer
> uses it (and replace the one use by OUTPUT_SENDER | OUTPUT_RECIPIENTS
> below).

As mentioned elsewhere, this is required to suppress the following warning.

notmuch-search.c:634:5: warning: case value ‘96’ not in enumerated type 
‘output_t’ [-Wswitch]

>
>>  } output_t;
>>
>>  typedef struct {
>> @@ -220,6 +223,67 @@ do_search_threads (search_options_t *o)
>>      return 0;
>>  }
>>
>> +static void
>> +print_address_list (const search_options_t *o, InternetAddressList *list)
>> +{
>> +    InternetAddress *address;
>> +    int i;
>> +
>> +    for (i = 0; i < internet_address_list_length (list); i++) {
>> +    address = internet_address_list_get_address (list, i);
>> +    if (INTERNET_ADDRESS_IS_GROUP (address)) {
>> +        InternetAddressGroup *group;
>> +        InternetAddressList *group_list;
>> +
>> +        group = INTERNET_ADDRESS_GROUP (address);
>> +        group_list = internet_address_group_get_members (group);
>> +        if (group_list == NULL)
>> +            continue;
>> +
>> +        print_address_list (o, group_list);
>> +    } else {
>> +        InternetAddressMailbox *mailbox;
>> +        const char *name;
>> +        const char *addr;
>> +        char *full_address;
>> +
>> +        mailbox = INTERNET_ADDRESS_MAILBOX (address);
>> +
>> +        name = internet_address_get_name (address);
>> +        addr = internet_address_mailbox_get_addr (mailbox);
>> +
>> +        if (name && *name)
>> +            full_address = talloc_asprintf (o->format, "%s <%s>", name, 
>> addr);
>> +        else
>> +            full_address = talloc_strdup (o->format, addr);
>> +
>> +        if (!full_address) {
>> +            fprintf (stderr, "Error: out of memory\n");
>> +            break;
>> +        }
>> +        o->format->string (o->format, full_address);
>> +        o->format->separator (o->format);
>> +
>> +        talloc_free (full_address);
>> +    }
>> +    }
>> +}
>> +
>> +static void
>> +print_address_string (const search_options_t *o, const char *recipients)
>> +{
>> +    InternetAddressList *list;
>> +
>> +    if (recipients == NULL)
>> +    return;
>> +
>> +    list = internet_address_list_parse_string (recipients);
>> +    if (list == NULL)
>> +    return;
>> +
>> +    print_address_list (o, list);
>> +}
>> +
>>  static int
>>  do_search_messages (search_options_t *o)
>>  {
>> @@ -266,11 +330,29 @@ do_search_messages (search_options_t *o)
>>
>>          notmuch_filenames_destroy( filenames );
>>
>> -    } else { /* output == OUTPUT_MESSAGES */
>> +    } else if (o->output == OUTPUT_MESSAGES) {
>>          format->set_prefix (format, "id");
>>          format->string (format,
>>                          notmuch_message_get_message_id (message));
>>          format->separator (format);
>> +    } else {
>> +        if (o->output & OUTPUT_SENDER) {
>> +            const char *addrs;
>> +
>> +            addrs = notmuch_message_get_header (message, "from");
>> +            print_address_string (o, addrs);
>> +        }
>> +
>> +        if (o->output & OUTPUT_RECIPIENTS) {
>> +            const char *hdrs[] = { "to", "cc", "bcc" };
>> +            const char *addrs;
>> +            size_t j;
>> +
>> +            for (j = 0; j < ARRAY_SIZE (hdrs); j++) {
>> +                addrs = notmuch_message_get_header (message, hdrs[j]);
>> +                print_address_string (o, addrs);
>> +            }
>> +        }
>>      }
>>
>>      notmuch_message_destroy (message);
>> @@ -337,7 +419,7 @@ notmuch_search_command (notmuch_config_t *config, int 
>> argc, char *argv[])
>>      notmuch_database_t *notmuch;
>>      search_options_t o = {
>>      .sort = NOTMUCH_SORT_NEWEST_FIRST,
>> -    .output = OUTPUT_SUMMARY,
>> +    .output = 0,
>>      .offset = 0,
>>      .limit = -1, /* unlimited */
>>      .dupe = -1,
>
> It is slightly unfortunate that all the other defaults are defined here
> but the default output is after the option parsing but I can't see a
> nice way round that. I only mention it in case you (or anyone else) can
> see a nice way round this.

Solution would to have --output as NOTMUCH_OPT_KEYWORD rather than
NOTMUCH_OPT_KEYWORD_FLAGS as it was in v2.

>
>> @@ -366,10 +448,12 @@ notmuch_search_command (notmuch_config_t *config, int 
>> argc, char *argv[])
>>                                { "text0", NOTMUCH_FORMAT_TEXT0 },
>>                                { 0, 0 } } },
>>      { NOTMUCH_OPT_INT, &notmuch_format_version, "format-version", 0, 0 },
>> -    { NOTMUCH_OPT_KEYWORD, &o.output, "output", 'o',
>> +    { NOTMUCH_OPT_KEYWORD_FLAGS, &o.output, "output", 'o',
>>        (notmuch_keyword_t []){ { "summary", OUTPUT_SUMMARY },
>>                                { "threads", OUTPUT_THREADS },
>>                                { "messages", OUTPUT_MESSAGES },
>> +                              { "sender", OUTPUT_SENDER },
>> +                              { "recipients", OUTPUT_RECIPIENTS },
>>                                { "files", OUTPUT_FILES },
>>                                { "tags", OUTPUT_TAGS },
>>                                { 0, 0 } } },
>> @@ -389,6 +473,9 @@ notmuch_search_command (notmuch_config_t *config, int 
>> argc, char *argv[])
>>      if (opt_index < 0)
>>      return EXIT_FAILURE;
>>
>> +    if (! o.output)
>> +    o.output = OUTPUT_SUMMARY;
>> +
>>      switch (format_sel) {
>>      case NOTMUCH_FORMAT_TEXT:
>>      o.format = sprinter_text_create (config, stdout);
>> @@ -455,18 +542,23 @@ notmuch_search_command (notmuch_config_t *config, int 
>> argc, char *argv[])
>>      }
>>
>>      switch (o.output) {
>> -    default:
>>      case OUTPUT_SUMMARY:
>>      case OUTPUT_THREADS:
>>      ret = do_search_threads (&o);
>>      break;
>>      case OUTPUT_MESSAGES:
>> +    case OUTPUT_SENDER:
>> +    case OUTPUT_RECIPIENTS:
>> +    case OUTPUT_ADDRESSES:
>
> This is the one use of OUTPUT_ADDRESSES that I would replace with
> OUTPUT_SENDER | OUTPUT_RECIPIENTS

See above.

-Michal
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