Implement file previews

When using HTTP "Content-Disposition: attachment;", users are forced to
download files in order to use them, whereas others might prefer to open
them in the browser.

Therefore, now that URL parameters are supported by http.h, previews can
be forced by adding "preview=1" or "preview=true" (case-insensitive) as
a URL parameters. Any other parameters are ignored by slcl.

For users, a "Preview" link has been added next to the "Share" button
for each file.

1 files changed, 13 insertions, 7 deletions

diff --git a/main.c b/main.c
index 66328a8..7fca16d 100644
--- a/main.c
+++ b/main.c
@@ -700,14 +700,20 @@ static int getnode(const struct http_payload *const p,
         goto end;
     }
 
-    const struct page_quota *const ppq = available ?
-        &(const struct page_quota)
-        {
-            .cur = cur,
-            .max = max
-        } : NULL;
+    const struct page_resource pr =
+    {
+        .r = r,
+        .args = p->args,
+        .n_args = p->n_args,
+        .dir = dir.str,
+        .root = root.str,
+        .res = d.str,
+        .q = available ?
+            &(const struct page_quota) {.cur = cur, .max = max }
+            : NULL
+    };
 
-    ret = page_resource(r, dir.str, root.str, d.str, ppq);
+    ret = page_resource(&pr);
 
 end:
     dynstr_free(&dir);