From 792ac4ec66dd098109a88065420ef95c1a78624f Mon Sep 17 00:00:00 2001
From: "Rafael G. Martins" <rafael@rafaelmartins.eng.br>
Date: Sat, 27 Apr 2019 04:22:56 +0200
Subject: make: support posts autoloading

---
 src/blogc-make/ctx.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 104 insertions(+), 4 deletions(-)

(limited to 'src/blogc-make/ctx.c')

diff --git a/src/blogc-make/ctx.c b/src/blogc-make/ctx.c
index 423b334..d7a503d 100644
--- a/src/blogc-make/ctx.c
+++ b/src/blogc-make/ctx.c
@@ -13,6 +13,7 @@
 #include <libgen.h>
 #include <limits.h>
 #include <time.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
@@ -267,7 +268,11 @@ bm_ctx_new(bm_ctx_t *base, const char *settings_file, const char *argv0,
     }
 
     rv->posts_fctx = NULL;
-    if (settings->posts != NULL) {
+    rv->posts_deleted = false;
+    if (bc_str_to_bool(bc_trie_lookup(settings->settings, "posts_autoload"))) {
+        bm_ctx_autoload_posts(rv);
+    }
+    else if (settings->posts != NULL) {
         for (size_t i = 0; settings->posts[i] != NULL; i++) {
             char *f = bm_generate_filename(content_dir, post_prefix,
                 settings->posts[i], source_ext);
@@ -306,7 +311,7 @@ bm_ctx_reload(bm_ctx_t **ctx)
     if (*ctx == NULL || (*ctx)->settings_fctx == NULL)
         return false;
 
-    if (bm_filectx_changed((*ctx)->settings_fctx, NULL, NULL)) {
+    if ((*ctx)->posts_deleted || bm_filectx_changed((*ctx)->settings_fctx, NULL, NULL)) {
         // reload everything! we could just reload settings_fctx, as this
         // would force rebuilding everything, but we need to know new/deleted
         // files
@@ -328,8 +333,13 @@ bm_ctx_reload(bm_ctx_t **ctx)
     bm_filectx_reload((*ctx)->atom_template_fctx);
     bm_filectx_reload((*ctx)->listing_entry_fctx);
 
-    for (bc_slist_t *tmp = (*ctx)->posts_fctx; tmp != NULL; tmp = tmp->next)
-        bm_filectx_reload((bm_filectx_t*) tmp->data);
+    if (bc_str_to_bool(bm_ctx_settings_lookup(*ctx, "posts_autoload"))) {
+        bm_ctx_autoload_posts(*ctx);
+    }
+    else {
+        for (bc_slist_t *tmp = (*ctx)->posts_fctx; tmp != NULL; tmp = tmp->next)
+            bm_filectx_reload((bm_filectx_t*) tmp->data);
+    }
 
     for (bc_slist_t *tmp = (*ctx)->pages_fctx; tmp != NULL; tmp = tmp->next)
         bm_filectx_reload((bm_filectx_t*) tmp->data);
@@ -341,6 +351,96 @@ bm_ctx_reload(bm_ctx_t **ctx)
 }
 
 
+void
+bm_ctx_autoload_posts(bm_ctx_t *ctx)
+{
+    if (ctx == NULL)
+        return;
+
+    const char *content_dir = bm_ctx_settings_lookup(ctx, "content_dir");
+    const char *post_prefix = bm_ctx_settings_lookup(ctx, "post_prefix");
+    const char *source_ext = bm_ctx_settings_lookup(ctx, "source_ext");
+
+    char *posts_dir = bm_generate_filename(content_dir, post_prefix, NULL, NULL);
+    char *abs_posts_dir = bc_strdup_printf("%s/%s", ctx->root_dir, posts_dir);
+    DIR *dir = opendir(abs_posts_dir);
+    if (dir == NULL) {
+        fprintf(stderr,
+            "blogc-make: warning: failed to open directory for posts autoload "
+            "(%s): %s\n", abs_posts_dir, strerror(errno));
+        free(posts_dir);
+        free(abs_posts_dir);
+        return;
+    }
+    free(abs_posts_dir);
+
+    // trick 0: avoid additional loops if we are not reloading
+    bool reloading = ctx->posts_fctx != NULL;
+
+    // trick 1: set all the post file contexts as unreadable, so we can detect
+    // which ones were deleted.
+    for (bc_slist_t *tmp = ctx->posts_fctx; tmp != NULL; tmp = tmp->next) {
+        bm_filectx_t *fc = tmp->data;
+        if (fc->readable) {
+            fc->readable = false;
+        }
+    }
+
+    struct dirent *e;
+    while (NULL != (e = readdir(dir))) {
+        if ((0 == strcmp(e->d_name, ".")) || (0 == strcmp(e->d_name, "..")))
+            continue;
+        if (!bc_str_ends_with(e->d_name, source_ext))
+            continue;
+        char *tmp = bc_strdup_printf("%s/%s", posts_dir, e->d_name);
+
+        // trick 2: if the file context exists in the index, just set it as
+        // readable
+        bm_filectx_t *fc = NULL;
+        if (reloading) {
+            for (bc_slist_t *t = ctx->posts_fctx; t != NULL; t = t->next) {
+                bm_filectx_t *fct = t->data;
+                if (0 == strcmp(fct->short_path, tmp)) {
+                    fc = fct;
+                    break;
+                }
+            }
+        }
+        if (fc != NULL) {
+            fc->readable = true;
+            bm_filectx_reload(fc);
+        }
+        else {
+            e->d_name[strlen(e->d_name) - strlen(source_ext)] = 0;
+            fc = bm_filectx_new(ctx, tmp, e->d_name, NULL);
+            ctx->posts_fctx = bc_slist_append(ctx->posts_fctx, fc);
+        }
+        free(tmp);
+    }
+
+    // trick 3: delete the unreadable file contexts
+    ctx->posts_deleted = false;
+    if (reloading) {
+        for (bc_slist_t *tmp = ctx->posts_fctx; tmp != NULL;) {
+            bm_filectx_t *fc = tmp->data;
+            if (!fc->readable) {
+                bc_slist_t *next = tmp->next;
+                ctx->posts_fctx = bc_slist_remove(ctx->posts_fctx, tmp,
+                    (bc_free_func_t) bm_filectx_free);
+                tmp = next;
+                ctx->posts_deleted = true;
+            }
+            else {
+                tmp = tmp->next;
+            }
+        }
+    }
+
+    closedir(dir);
+    free(posts_dir);
+}
+
+
 void
 bm_ctx_free_internal(bm_ctx_t *ctx)
 {
-- 
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