From cab498199e1faa29416aa5b13a0294a67f19fbf8 Mon Sep 17 00:00:00 2001
From: Squibid <me@zacharyscheiman.com>
Date: Sat, 21 Dec 2024 21:35:07 -0500
Subject: optimizations :) instead of initializing libgit2 and then looking for
 a repo, we do a naive check to see if one exists and then if so initialize
 libgit2

---
 XD.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 62 insertions(+), 8 deletions(-)

(limited to 'XD.c')

diff --git a/XD.c b/XD.c
index 20add73..c44fe3f 100644
--- a/XD.c
+++ b/XD.c
@@ -6,6 +6,8 @@
 #endif
 
 #ifdef GIT
+#include <sys/stat.h>
+#include <dirent.h>
 #include <git2.h>
 #endif
 
@@ -34,6 +36,45 @@ l(const char *fmt, ...)
 #endif
 
 #ifdef GIT
+/**
+ * @brief search all parent directories for a git repo
+ *
+ * @return absolute path to git repo
+ */
+char
+*find_git_repo()
+{
+  char path[PATH_MAX] = ".", *rpath;
+  struct stat s;
+  int i, c;
+
+
+  /* find the number of jumps to the root of the fs */
+  rpath = realpath(path, NULL);
+  for (i = c = 0; i < strlen(rpath); i++) {
+    if (rpath[i] == '/') {
+      c++;
+    }
+  }
+  free(rpath);
+
+  /* start searching */
+  for (i = c; i > 0; i--) {
+    strcat(path, "/.git");
+
+    /* if there seems to be a git directory return the directory it was found in */
+    if (stat(path, &s) == 0 && S_ISDIR(s.st_mode)) {
+      return realpath(path, NULL);
+    }
+
+    /* reset contents of gpath, and go up a directory */
+    memset(&path[strlen(path) - 4], '.', 2);
+    memset(&path[strlen(path) - 2], 0, 2);
+  }
+
+  return NULL;
+}
+
 /**
  * @brief open git repo if one is available at the current path
  *
@@ -42,27 +83,40 @@ l(const char *fmt, ...)
 git_repository
 *init_git()
 {
-  git_buf buf = GIT_BUF_INIT_CONST(NULL, 0);
+  char *buf;
   git_repository *repo;
 
-  if (git_libgit2_init() < 0) {
-    L("Failed to initalize libgit2, proceeding without git functionality enabled.");
+  /* check for a repo before loading libgit2 */
+  if ((buf = find_git_repo()) == NULL) {
     return NULL;
   }
 
-  if (git_repository_discover(&buf, ".", 0, NULL) < 0) {
-    L("Failed to discover git repo: %s", git_error_last()->message);
+  /* disable a bunch of git options to hopefully speed things up */
+  git_libgit2_opts(GIT_OPT_ENABLE_CACHING, 0);
+  git_libgit2_opts(GIT_OPT_SET_MWINDOW_SIZE, 0);
+  git_libgit2_opts(GIT_OPT_SET_MWINDOW_MAPPED_LIMIT, 0);
+
+  git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, "");
+  git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_XDG, "");
+  git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_SYSTEM, "");
+  git_libgit2_opts(GIT_OPT_SET_TEMPLATE_PATH, "");
+
+  git_libgit2_opts(GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS, 1);
+
+  /* initialize the git library and repository */
+  if (git_libgit2_init() < 0) {
+    L("Failed to initalize libgit2, proceeding without git functionality enabled.");
     return NULL;
   }
 
-  if (git_repository_open(&repo, buf.ptr) < 0) {
+  if (git_repository_open(&repo, buf) < 0) {
     L("Failed to open git repo: %s", git_error_last()->message);
-    git_buf_dispose(&buf);
+    free(buf);
     return NULL;
   }
 
   /* get rid of object containing git repo path and return the repo */
-  git_buf_dispose(&buf);
+  free(buf);
   return repo;
 }
 
-- 
cgit v1.2.1