vim-patch:8.0.1398: :packadd does not load packages from the "start" directory (#8762)

Problem:    :packadd does not load packages from the "start" directory.
            (Alejandro Hernandez)
Solution:   Make :packadd look in the "start" directory if those packages were
            not loaded on startup.
https://github.com/vim/vim/commit/9e1d399e63903c6f84d7888ad8d84ebf4e29d8a1

1 files changed, 21 insertions, 8 deletions

diff --git a/src/nvim/ex_cmds2.c b/src/nvim/ex_cmds2.c
index f07bc0e137..120278d3fb 100644
--- a/src/nvim/ex_cmds2.c
+++ b/src/nvim/ex_cmds2.c
@@ -2693,14 +2693,27 @@ void ex_packloadall(exarg_T *eap)
 /// ":packadd[!] {name}"
 void ex_packadd(exarg_T *eap)
 {
-  static const char *plugpat = "pack/*/opt/%s";  // NOLINT
-
-  size_t len = STRLEN(plugpat) + STRLEN(eap->arg);
-  char *pat = (char *)xmallocz(len);
-  vim_snprintf(pat, len, plugpat, eap->arg);
-  do_in_path(p_pp, (char_u *)pat, DIP_ALL + DIP_DIR + DIP_ERR, add_pack_plugin,
-             eap->forceit ? &APP_ADD_DIR : &APP_BOTH);
-  xfree(pat);
+  static const char *plugpat = "pack/*/%s/%s";    // NOLINT
+  int res = OK;
+
+  // Round 1: use "start", round 2: use "opt".
+  for (int round = 1; round <= 2; round++) {
+    // Only look under "start" when loading packages wasn't done yet.
+    if (round == 1 && did_source_packages) {
+      continue;
+    }
+
+    const size_t len = STRLEN(plugpat) + STRLEN(eap->arg) + 5;
+    char *pat = xmallocz(len);
+    vim_snprintf(pat, len, plugpat, round == 1 ? "start" : "opt", eap->arg);
+    // The first round don't give a "not found" error, in the second round
+    // only when nothing was found in the first round.
+    res = do_in_path(p_pp, (char_u *)pat,
+                     DIP_ALL + DIP_DIR
+                     + (round == 2 && res == FAIL ? DIP_ERR : 0),
+                     add_pack_plugin, eap->forceit ? &APP_ADD_DIR : &APP_BOTH);
+    xfree(pat);
+  }
 }
 
 /// ":options"