feat(cargo): Use the CARGO_HOME environment variable to locate the configuration file.

Author: AnonTokio

src/recipe/lang/Rust/Cargo.c

@@ -78,12 +78,33 @@ pl_rust_cargo_note_get_src_mirror (char *url, bool sparse)
   say (xy_2strcat (url, sparse ? " (sparse)" : ""));
 }
 
+static char *
+pl_rust_cargo_config_file (void)
+{
+  char *file = xy_normalize_path ("~/.cargo/config.toml");
+  char *cargo_home = getenv ("CARGO_HOME");
+  if (cargo_home && *cargo_home)
+    {
+      char *dir = xy_normalize_path(cargo_home);
+      if (!xy_str_end_with (dir, "/") && !xy_str_end_with (dir, "\\"))
+        {
+          char *tmp = xy.on_windows ? xy_2strcat (dir, "\\") : xy_2strcat (dir, "/");
+          free(dir);
+          dir = tmp;
+        }
+      file = xy_2strcat (dir, "config.toml");
+      free(dir);
+    }
+  return file;
+}
+
 void
 pl_rust_cargo_getsrc (char *option)
 {
-  char *cargo_config_file = xy_normalize_path ("~/.cargo/config.toml");
+  char *cargo_config_file = pl_rust_cargo_config_file ();
 
   char *raw_content = xy_file_read (cargo_config_file);
+  free (cargo_config_file);
   char *formatted_content = xy_str_gsub (raw_content, " ", "");
   formatted_content = xy_str_gsub (formatted_content, "'", "\"");
 
@@ -136,12 +157,7 @@ pl_rust_cargo_setsrc (char *option)
   chsrc_use_this_source (pl_rust_cargo);
 
   char *default_content = RAWSTR_pl_rust_cargo_config;
-  char *cargo_config_dir = "~/.cargo/";
-  char *cargo_config_file = xy_2strcat (cargo_config_dir, "config.toml");
-
-  chsrc_ensure_dir (cargo_config_dir);
-
-  cargo_config_file = xy_normalize_path (cargo_config_file);
+  char *cargo_config_file = pl_rust_cargo_config_file ();
 
   if (xy_file_exist (cargo_config_file))
     {
@@ -188,6 +204,7 @@ pl_rust_cargo_setsrc (char *option)
     goto finish;
 
 finish:
+  free (cargo_config_file);
   chsrc_determine_chgtype (ChgType_Auto);
   chsrc_conclude (&source);
 }