fix: warn for inapplicable git commands

lua/git/cmd.lua

@@ -465,7 +465,7 @@ end
 function M.run(args, opts)
     local r = repo.resolve()
     if not r then
-        util.error("not in a git repository")
+        util.warning("not in a git repository")
         return
     end
 

lua/git/commit.lua

@@ -8,7 +8,7 @@ local M = {}
 function M.commit(opts)
     local r = repo.resolve()
     if not r then
-        util.error("not in a git repository")
+        util.warning("not in a git repository")
         return
     end
 

lua/git/diffsplit.lua

@@ -172,7 +172,7 @@ function M.open(opts)
         other, err = infer_other(cur_buf)
     end
     if not other then
-        util.error("%s", err or "no diff side")
+        util.warning("%s", err or "no diff side")
         return
     end
     local mods = layout_mods(opts.mods, opts.layout)
@@ -197,12 +197,12 @@ function M.open_pair(old, new, opts)
     local cur_buf = vim.api.nvim_get_current_buf()
     local new_buf, err = buf_for_side(new, cur_buf)
     if not new_buf then
-        util.error("%s", err or "no new diff side")
+        util.warning("%s", err or "no new diff side")
         return
     end
     local old_name, _, old_err = resolve_side(old, cur_buf)
     if not old_name then
-        util.error("%s", old_err or "no old diff side")
+        util.warning("%s", old_err or "no old diff side")
         return
     end
 

lua/git/log_view.lua

@@ -81,7 +81,7 @@ function M.open(opts)
     opts = opts or {}
     local r = repo.resolve()
     if not r then
-        util.error("not in a git repository")
+        util.warning("not in a git repository")
         return
     end
 

lua/git/status_view.lua

@@ -685,7 +685,7 @@ function M.open(opts)
     end
     local r = repo.resolve()
     if not r then
-        util.error("not in a git repository")
+        util.warning("not in a git repository")
         return
     end