stamail

commit c12a9d015ed92c1b16b6e8ffaef2f0cd132860bc
parent cf1a6751aaca3dbb6c8acd16c3d24e917788ee5c
Author: Nathaniel Chappelle <nathaniel@chappelle.dev>
Date:   Sat, 24 Jan 2026 14:47:57 -0800

made parser into callback machine

Diffstat:
M
Makefile
 | 
3
+++
M
json.c
 | 
33
+++++++++++++++++++++------------
M
json.h
 | 
13
++++++++++++-
M
stamail.c
 | 
16
+++++++++++++++-

4 files changed, 51 insertions(+), 14 deletions(-)
diff --git a/Makefile b/Makefile
@@ -17,5 +17,8 @@ json.o: json.c json.h jsmn.h
 clean:
 	rm -f $(OBJ) $(BIN)
 
+messages: 
+	notmuch show --format=json '*' | ./stamail
+
 .PHONY: all clean
 
diff --git a/json.c b/json.c
@@ -9,7 +9,8 @@ static int tok_streq(const char *js, jsmntok_t *t, const char *s) {
             strncmp(js + t->start, s, t->end - t->start) == 0);
 }
 
-static void scan(const char *js, jsmntok_t *t, int *i, int ntok) {
+static void scan(const char *js, jsmntok_t *t, int *i, int ntok,
+                 message_cb cb, void *ud) {
     if (*i >= ntok) return;
 
     if (t[*i].type == JSMN_OBJECT) {
@@ -95,14 +96,22 @@ static void scan(const char *js, jsmntok_t *t, int *i, int ntok) {
 
         /* If this object looks like a message, print it */
         if (id && subject && from && date) {
-            printf("Message-ID: %.*s\n", id_len, id);
-            printf("From:       %.*s\n", from_len, from);
-            printf("Subject:    %.*s\n", subject_len, subject);
-            printf("Date:       %.*s\n", date_len, date);
-            if (body) {
-                printf("Body:\n%.*s\n", body_len, body);
-            }
-            printf("--------------------------------------------------\n");
+            struct message m = {
+                .id = id, .id_len = id_len,
+                .from = from, .from_len = from_len,
+                .subject = subject, .subject_len = subject_len,
+                .date = date, .date_len = date_len,
+                .body = body, .body_len = body_len
+            };
+            cb(&m, ud);
+            // printf("Message-ID: %.*s\n", id_len, id);
+            // printf("From:       %.*s\n", from_len, from);
+            // printf("Subject:    %.*s\n", subject_len, subject);
+            // printf("Date:       %.*s\n", date_len, date);
+            // if (body) {
+            //     printf("Body:\n%.*s\n", body_len, body);
+            // }
+            // printf("--------------------------------------------------\n");
         }
         return;
     }
@@ -112,7 +121,7 @@ static void scan(const char *js, jsmntok_t *t, int *i, int ntok) {
         int n = t[*i].size;
         (*i)++;
         for (int k = 0; k < n; k++) {
-            scan(js, t, i, ntok);
+            scan(js, t, i, ntok, cb, ud);
         }
         return;
     }
@@ -120,7 +129,7 @@ static void scan(const char *js, jsmntok_t *t, int *i, int ntok) {
     (*i)++;
 }
 
-void parse_mail_json(const char *json, int len) {
+void parse_mail_json(const char *json, int len, message_cb cb, void* userdata) {
     jsmn_parser p;
     jsmn_init(&p);
 
@@ -132,6 +141,6 @@ void parse_mail_json(const char *json, int len) {
     }
 
     int i = 0;
-    scan(json, tokens, &i, ntok);
+    scan(json, tokens, &i, ntok, cb, userdata);
 }
 
diff --git a/json.h b/json.h
@@ -1,8 +1,19 @@
 #ifndef JSON_H
 #define JSON_H
 
+struct message {
+    const char *id;     int id_len;
+    const char *from;   int from_len;
+    const char *subject;int subject_len;
+    const char *date;   int date_len;
+    const char *body;   int body_len;
+};
+
+/* Called for every message found */
+typedef void (*message_cb)(struct message *m, void *userdata);
+
 /* Parse JSON buffer and print extracted mail fields */
-void parse_mail_json(const char *json, int len);
+void parse_mail_json(const char *json, int len, message_cb cb, void *userdata);
 
 #endif
 
diff --git a/stamail.c b/stamail.c
@@ -2,6 +2,20 @@
 #include <stdlib.h>
 #include "json.h"
 
+/* Current callback handler */
+static void print_message(struct message *m, void *ud) {
+    (void)ud;
+
+    printf("Message-ID: %.*s\n", m->id_len, m->id);
+    printf("From:       %.*s\n", m->from_len, m->from);
+    printf("Subject:    %.*s\n", m->subject_len, m->subject);
+    printf("Date:       %.*s\n", m->date_len, m->date);
+    if (m->body) {
+        printf("Body:\n%.*s\n", m->body_len, m->body);
+    }
+    printf("--------------------------------------------------\n");
+}
+
 int main(void) {
     /* Slurp stdin */
     char *buf = NULL;
@@ -22,7 +36,7 @@ int main(void) {
 
     if (!buf) return 0;
 
-    parse_mail_json(buf, len);
+    parse_mail_json(buf, len, print_message, NULL);
 
     free(buf);
     return 0;