A path typed with a leading ~ is the home directory, at every entry point that takes one, through one helper

Only DumpDir (dump.zig) and ShaderBuild expanded `~/`, each its own way.
So a look at `~/notes.txt`, `name ~/x`, `Save ~/x`, ThemeFile, Restore and
a quoted `pardes '~/x'` all took `~` as a directory of that name under the
pane's. There is now one rule, filesystem.expandHome. A leading `~`,
alone or before `/` or `:`, is $HOME, else the passwd entry's home;
`~user` is that user's (getpwnam). As in a shell, it applies even beside a
file named `~`, and `./~` names that file. Every entry point runs its
typed path through it:
- look, B3 and 9P, before any parsing, so `~/x:12`, `~/x:12:3` and
  `~/x:/re/` all work;
- name, and a tag's rename;
- Save <path>;
- ThemeFile, DumpDir, Restore and ShaderBuild's shader files;
- the forwarding launch.
Recent rows are not shown with `~` and need nothing. How names are shown
is unchanged.

Tests: expandHome's cases, and HOME unset (passwd), with HOME passed in
rather than set, since setenv moves the environ a spawned child reads.
fs.py covers Save into missing directories under `~`, `name ~/x`, a look
at `~/x:3`, and a forwarded `pardes '~/x'`.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 2 insertions, 5 deletions

diff --git a/src/dump.zig b/src/dump.zig
index 1cc115be..8e767240 100644
--- a/src/dump.zig
+++ b/src/dump.zig
@@ -100,13 +100,10 @@ fn hostEnv(name: [*:0]const u8) ?[*:0]u8 {
 /// setting when set (a leading `~/` is the home directory), else the default.
 pub fn directory(buf: []u8, dir_setting: []const u8) ?[]const u8 {
     if (dir_setting.len == 0) return defaultDirectory(buf);
-    var joined: [2048]u8 = undefined;
+    var joined: [4096]u8 = undefined;
     // `~/x`, else a relative one from the directory pardes started in: the
     // same place however it was written, and shown so.
-    const raw = if (std.mem.startsWith(u8, dir_setting, "~/")) (if (hostEnv("HOME")) |h|
-        std.fmt.bufPrint(&joined, "{s}/{s}", .{ std.mem.span(h), dir_setting[2..] }) catch return null
-    else
-        dir_setting) else dir_setting;
+    const raw = pardes.filesystem.expandHome(dir_setting, &joined);
     var fba_buf: [4096]u8 = undefined;
     var fba = std.heap.FixedBufferAllocator.init(&fba_buf);
     var cwd_buf: [1024]u8 = undefined;