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https://git.notmuchmail.org/git/notmuch
synced 2024-11-22 02:48:08 +01:00
Add structured output formatter for JSON and plain text (but don't use them yet).
Using the new structured printer support in sprinter.h, implement sprinter_json_create, which returns a new JSON structured output formatter. The formatter prints output similar to the existing JSON, but with differences in whitespace (mostly newlines, --output=summary prints the entire message summary on one line, not split across multiple lines). Also implement a "structured" formatter for plain text that prints prefixed strings, to be used with notmuch-search.c plain text output.
This commit is contained in:
craven@gmx.net
David Bremner
parent
41becc0c9d
commit
36522fca1c
4 changed files with 325 additions and 0 deletions
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@ -290,6 +290,8 @@ notmuch_client_srcs = \
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notmuch-show.c \
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notmuch-tag.c \
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notmuch-time.c \
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sprinter-json.c \
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sprinter-text.c \
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query-string.c \
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mime-node.c \
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crypto.c \
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187
sprinter-json.c
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187
sprinter-json.c
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@ -0,0 +1,187 @@
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#include <stdbool.h>
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#include <stdio.h>
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#include <talloc.h>
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#include "sprinter.h"
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struct sprinter_json {
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struct sprinter vtable;
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FILE *stream;
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/* Top of the state stack, or NULL if the printer is not currently
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* inside any aggregate types. */
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struct json_state *state;
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/* A flag to signify that a separator should be inserted in the
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* output as soon as possible.
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*/
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notmuch_bool_t insert_separator;
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};
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struct json_state {
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struct json_state *parent;
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/* True if nothing has been printed in this aggregate yet.
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* Suppresses the comma before a value. */
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notmuch_bool_t first;
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/* The character that closes the current aggregate. */
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char close;
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};
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/* Helper function to set up the stream to print a value. If this
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* value follows another value, prints a comma. */
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static struct sprinter_json *
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json_begin_value (struct sprinter *sp)
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{
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struct sprinter_json *spj = (struct sprinter_json *) sp;
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if (spj->state) {
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if (! spj->state->first) {
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fputc (',', spj->stream);
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if (spj->insert_separator) {
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fputc ('\n', spj->stream);
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spj->insert_separator = FALSE;
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} else {
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fputc (' ', spj->stream);
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}
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} else {
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spj->state->first = FALSE;
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}
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}
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return spj;
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}
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/* Helper function to begin an aggregate type. Prints the open
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* character and pushes a new state frame. */
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static void
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json_begin_aggregate (struct sprinter *sp, char open, char close)
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{
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struct sprinter_json *spj = json_begin_value (sp);
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struct json_state *state = talloc (spj, struct json_state);
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fputc (open, spj->stream);
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state->parent = spj->state;
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state->first = TRUE;
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state->close = close;
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spj->state = state;
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}
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static void
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json_begin_map (struct sprinter *sp)
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{
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json_begin_aggregate (sp, '{', '}');
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}
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static void
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json_begin_list (struct sprinter *sp)
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{
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json_begin_aggregate (sp, '[', ']');
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}
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static void
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json_end (struct sprinter *sp)
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{
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struct sprinter_json *spj = (struct sprinter_json *) sp;
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struct json_state *state = spj->state;
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fputc (spj->state->close, spj->stream);
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spj->state = state->parent;
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talloc_free (state);
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if (spj->state == NULL)
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fputc ('\n', spj->stream);
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}
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static void
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json_string (struct sprinter *sp, const char *val)
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{
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static const char *const escapes[] = {
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['\"'] = "\\\"", ['\\'] = "\\\\", ['\b'] = "\\b",
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['\f'] = "\\f", ['\n'] = "\\n", ['\t'] = "\\t"
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};
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struct sprinter_json *spj = json_begin_value (sp);
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fputc ('"', spj->stream);
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for (; *val; ++val) {
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unsigned char ch = *val;
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if (ch < ARRAY_SIZE (escapes) && escapes[ch])
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fputs (escapes[ch], spj->stream);
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else if (ch >= 32)
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fputc (ch, spj->stream);
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else
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fprintf (spj->stream, "\\u%04x", ch);
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}
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fputc ('"', spj->stream);
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}
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static void
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json_integer (struct sprinter *sp, int val)
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{
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struct sprinter_json *spj = json_begin_value (sp);
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fprintf (spj->stream, "%d", val);
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}
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static void
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json_boolean (struct sprinter *sp, notmuch_bool_t val)
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{
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struct sprinter_json *spj = json_begin_value (sp);
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fputs (val ? "true" : "false", spj->stream);
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}
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static void
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json_null (struct sprinter *sp)
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{
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struct sprinter_json *spj = json_begin_value (sp);
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fputs ("null", spj->stream);
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}
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static void
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json_map_key (struct sprinter *sp, const char *key)
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{
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struct sprinter_json *spj = (struct sprinter_json *) sp;
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json_string (sp, key);
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fputs (": ", spj->stream);
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spj->state->first = TRUE;
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}
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static void
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json_set_prefix (unused (struct sprinter *sp), unused (const char *name))
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{
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}
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static void
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json_separator (struct sprinter *sp)
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{
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struct sprinter_json *spj = (struct sprinter_json *) sp;
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spj->insert_separator = TRUE;
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}
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struct sprinter *
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sprinter_json_create (const void *ctx, FILE *stream)
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{
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static const struct sprinter_json template = {
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.vtable = {
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.begin_map = json_begin_map,
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.begin_list = json_begin_list,
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.end = json_end,
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.string = json_string,
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.integer = json_integer,
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.boolean = json_boolean,
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.null = json_null,
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.map_key = json_map_key,
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.separator = json_separator,
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.set_prefix = json_set_prefix,
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.is_text_printer = FALSE,
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}
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};
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struct sprinter_json *res;
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res = talloc (ctx, struct sprinter_json);
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if (! res)
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return NULL;
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*res = template;
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res->stream = stream;
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return &res->vtable;
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}
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126
sprinter-text.c
Normal file
126
sprinter-text.c
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@ -0,0 +1,126 @@
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#include <stdbool.h>
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#include <stdio.h>
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#include <talloc.h>
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#include "sprinter.h"
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/* "Structured printer" interface for unstructured text printing.
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* Note that --output=summary is dispatched and formatted in
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* notmuch-search.c, the code in this file is only used for all other
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* output types.
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*/
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struct sprinter_text {
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struct sprinter vtable;
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FILE *stream;
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/* The current prefix to be printed with string/integer/boolean
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* data.
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*/
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const char *current_prefix;
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/* A flag to indicate if this is the first tag. Used in list of tags
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* for summary.
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*/
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notmuch_bool_t first_tag;
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};
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static void
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text_string (struct sprinter *sp, const char *val)
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{
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struct sprinter_text *sptxt = (struct sprinter_text *) sp;
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if (sptxt->current_prefix != NULL)
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fprintf (sptxt->stream, "%s:", sptxt->current_prefix);
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fputs(val, sptxt->stream);
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}
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static void
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text_integer (struct sprinter *sp, int val)
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{
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struct sprinter_text *sptxt = (struct sprinter_text *) sp;
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fprintf (sptxt->stream, "%d", val);
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}
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static void
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text_boolean (struct sprinter *sp, notmuch_bool_t val)
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{
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struct sprinter_text *sptxt = (struct sprinter_text *) sp;
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fputs (val ? "true" : "false", sptxt->stream);
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}
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static void
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text_separator (struct sprinter *sp)
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{
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struct sprinter_text *sptxt = (struct sprinter_text *) sp;
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fputc ('\n', sptxt->stream);
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}
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static void
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text_set_prefix (struct sprinter *sp, const char *prefix)
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{
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struct sprinter_text *sptxt = (struct sprinter_text *) sp;
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sptxt->current_prefix = prefix;
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}
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/* The structure functions begin_map, begin_list, end and map_key
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* don't do anything in the text formatter.
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*/
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static void
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text_begin_map (unused (struct sprinter *sp))
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{
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}
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static void
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text_begin_list (unused (struct sprinter *sp))
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{
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}
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static void
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text_end (unused (struct sprinter *sp))
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{
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}
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static void
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text_null (unused (struct sprinter *sp))
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{
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}
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static void
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text_map_key (unused (struct sprinter *sp), unused (const char *key))
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{
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}
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struct sprinter *
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sprinter_text_create (const void *ctx, FILE *stream)
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{
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static const struct sprinter_text template = {
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.vtable = {
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.begin_map = text_begin_map,
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.begin_list = text_begin_list,
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.end = text_end,
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.string = text_string,
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.integer = text_integer,
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.boolean = text_boolean,
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.null = text_null,
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.map_key = text_map_key,
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.separator = text_separator,
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.set_prefix = text_set_prefix,
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.is_text_printer = TRUE,
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},
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};
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struct sprinter_text *res;
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res = talloc (ctx, struct sprinter_text);
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if (! res)
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return NULL;
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*res = template;
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res->stream = stream;
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return &res->vtable;
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}
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10
sprinter.h
10
sprinter.h
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@ -55,4 +55,14 @@ typedef struct sprinter {
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notmuch_bool_t is_text_printer;
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} sprinter_t;
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/* Create a new unstructured printer that emits the default text format
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* for "notmuch search". */
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struct sprinter *
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sprinter_text_create (const void *ctx, FILE *stream);
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/* Create a new structure printer that emits JSON. */
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struct sprinter *
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sprinter_json_create (const void *ctx, FILE *stream);
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#endif // NOTMUCH_SPRINTER_H
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