Port fish.cpp to Rust #9962

henrikhorluck · 2023-08-18T07:33:51Z

This is based on #9950 to have CARGO_MANIFEST_DIR == CMAKE_SOURCE_DIR

Fix clippy lint in widestring-suffix
Use a cargo workspace
Make CI use the workspace, so we format/check all
Use the workspace from CMake
Specify default-members as fish-rust
Move edition and MSRV to workspace

Changes in this PR are:

Make CARGO_MANIFEST_DIR for fish-rust equal to src
Forward CMake configs to Cargo
Make PROGRAM_NAME safe
Port history::start_private_mode to Rust
Make ParsedSource::new pub
Make methods in path not unnecessairly take &mut
Port MISSING_HELP and MISSING (arg)
Add various FFI-interop-functions
Make ConfigPaths store as PathBuf
Port more of env_init to Rust
Port and adopt main written in Rust

Main now uses wgetoptr_t instead of getopt.

Typing-wise I attempted to prefer PathBuf over WString since we are operating on paths.

I encountered a couple issues: fwprintf! appears to not do anything? FLOGF! does not format

henrikhorluck · 2023-08-18T17:30:33Z

This appears to have introduced flakiness to test_convert_ascii, I am not sure why?

EDIT: likely some race-condition, does not fail when run by itself with cargo t test_convert_ascii_specific

Specifically this test case sometimes fails locally and in CI on macOS

#[test]
fn test_convert_ascii_specific() {
    const FAILURE: &[u8] = &[
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        56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49,
        50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53,
        54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
        48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51,
        52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55,
        56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49,
        50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53,
        54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
        48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51,
        52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55,
        56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49,
        50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53,
        54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
        48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51,
        52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55,
        56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49,
        50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53,
        54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
        48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51,
        52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55,
        56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53,
    ];
    let tc = FAILURE.to_vec();
    assert_eq!(wcs2string(&str2wcstring(&tc)), tc)
}

Example output

failures:

---- tests::string_escape::test_convert_ascii_specific stdout ----
thread 'tests::string_escape::test_convert_ascii_specific' panicked at 'assertion failed: `(left == right)`
  left: `[48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 195, 131, 194, 183, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 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54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 49, 50, 51, 52, 53]`', fish-rust/src/tests/string_escape.rs:386:5

EDIT: a couple pexpect tests are also failing in my fork I don't recall if they are known flaky

Failure in exit_nohang

Link to the run

209/233 Test #209: exit_nohang.py ...........................***Failed    9.11 sec
Testing file pexpects/exit_nohang.py:Test failed: Test failed: outer fish 17950 did not transfer tty owner to fish_test_helper
Trying pexpects/exit_nohang.py for a second time
Testing file pexpects/exit_nohang.py:Test failed: Test failed: outer fish 17981 did not transfer tty owner to fish_test_helper
1 test failed

Failure in wildcard_tab.py

Link to run

232/233 Test #232: wildcard_tab.py ..........................***Failed   13.35 sec
Testing file pexpects/wildcard_tab.py:Failed to match pattern: prompt 1
wildcard_tab.py:15: timeout from expect_prompt()


Escaped buffer:


When written to the tty, this looks like:
<-------

------->

Last 10 messages:

Trying pexpects/wildcard_tab.py for a second time
Testing file pexpects/wildcard_tab.py:Failed to match pattern: prompt 1
wildcard_tab.py:15: timeout from expect_prompt()


Escaped buffer:


When written to the tty, this looks like:
<-------

------->

Last 10 messages:

1 test failed

faho · 2023-08-18T18:52:37Z

fish-rust/build.rs

@@ -103,6 +126,25 @@ fn main() {
    rsconf::rebuild_if_paths_changed(&source_files);
 }

+fn find_version() -> Result<String, Box<dyn std::error::Error>> {


This appears to me to be what https://crates.io/crates/git-version says it does.

It just runs git itself, which I would find preferable over depending on the entirety of the git reimplementation that is libgit2.

That's also basically what we do now

We could also use the script directly (with --stdout). I don't know how the envisioned full replacement of CMake with Cargo will look like, and I wanted this change to be somewhat independent of that

I ended up just using the script directly

Contra-message: To avoid change-detection issues, I re-added git_version, see 0ea11f5

Cargo.toml

fish-rust/src/common.rs

fish-rust/src/history.rs

src/parse_util.cpp

fish-rust/src/env/environment.rs

krobelus · 2023-08-19T14:25:18Z

fish-rust/src/env/environment.rs

+    // (See issue #2784).
+    // PORTING: this should behave like in C++ in regards to the above comment, but that might be
+    // with assumptions on the standard library's behavior.
+    for (key, val) in env_iter.into_iter().rev() {


right. Maybe we should call environ() ourselves

probably we should keep walking environ backwards, unless we know that there is no security issue here

This is walking backwards, it calls .rev(), the std-implementation walks forwards, as in https://github.com/rust-lang/rust/blob/2ceed0b6cb9e9866225d7cfcfcbb4a62db047163/library/std/src/sys/unix/os.rs#L560, and AFAIK this did not fix any known vulnerabilities when it was added, ref. #2784

fish-rust/src/env/environment.rs

src/env.cpp

fish-rust/src/fish.rs

krobelus · 2023-08-19T15:09:16Z

fish-rust/src/fish.rs

+    if let Ok(exec_path) = exec_path.canonicalize() {
+        FLOGF!(
+            config,
+            format!("exec_path: {:?}, argv[0]: {:?}", exec_path, argv0)


should remove the separate format call -- FLOGF already does that (soon) --
unless we really need the Debug representations? Is Display not enough?

I think this needs Debug. PathBuf/Path has a .display() method that performs lossy conversion. While Debug escapes

The Cpp code here used std::string with as far as I can understand potentially invalid UTF8.

fish-shell/src/fish.cpp

Line 152 in 0f19d71

FLOGF(config, L"exec_path: '%s', argv[0]: '%s'", exec_path.c_str(), argv0);

This is messy in terms of handling lossy vs escaped aka Debug vs print it raw (which I don't think we ever should?)

The Cpp code here used std::string with as far as I can understand potentially invalid UTF8.

std::string is basically a resizable array/vector of arbitrary bytes, yes.

C++ basically... punts on encoding almost entirely.

This does print it with quotes now:
config: exec_path: "/ABSOLUTE_PATH/fish-shell/build/fish", argv[0]: "./build/fish"
We probably want to specify when we want to print it in debug vs lossy, but since this is meant for debugging I think Debug is appropriate.

The error/warning-ones uses lossy currently (and have tests that require no quoting)

fish-rust/src/fish.rs

krobelus · 2023-08-19T15:51:45Z

fish-rust/src/fish.rs

+
+    // Direct any debug output right away.
+    // --debug-output takes precedence, otherwise $FISH_DEBUG_OUTPUT is used.
+    // PORTING: this is a slight difference from C++, we now skip reading the env var if the argument is an empty string


the behavior change seems acceptable

fish-rust/src/fish.rs

Cargo.toml

krobelus · 2023-08-19T16:01:43Z

I ran ninja test 10 times and could not reproduce a failure.

henrikhorluck · 2023-08-20T14:26:03Z

I can no longer reproduce the failure in test_convert_ascii locally, I still have no clue what caused it, here is a CI run where it occurred: https://github.com/henrikhorluck/fish-shell/actions/runs/5905056592/job/16018406020

Seeing as it can no longer be reproduced I see no reason to block merging on it

krobelus · 2023-08-20T17:48:33Z

I'll merge tomorrow. We're getting close, only the reader and its dependencies are missing

tests/checks/default-setup-path.fish

fish-rust/src/fish.rs

henrikhorluck · 2023-08-25T21:58:56Z

The test_convert_ascii flakiness has returned (in the CI in my fork) https://github.com/henrikhorluck/fish-shell/actions/runs/5980653829/job/16227194870#step:7:705

It has not returned locally.

- It is currently never set, but will be set once `main` is ported - `should_suppress_stderr_for_tests` used to be PROGRAM_NAME != TESTS_PROGRAM_NAME, but the equivalent C++ code was `!std::wcscmp(program_name, TESTS_PROGRAM_NAME)`, and `wcsmp` returns zero if they are equal, thus is equivalent to `==` in Rust

It will be used from main

C++ main used getopt (no w!), which appears to internally print error-messages. The Rust version will use `wgetopter_t`, and therefore needs to print this itself.

- It does not need to require the default to be valid UTF8

- `libc::setlinebuf` is not available through Rust's libc it appears. - autocxx fails to generate bindings using `*mut FILE`, instead go through `void*` - rust_main needs `parse_util_detect_errors_in_ast`, which is _partially_ ported, instead add FFI interop for C++. - We need to set the filename if we are sourcing a file

- These are paths, we can just store them raw.

In CMake this used a `version` file in the CARGO_MANIFEST_DIR, but relying on that is problematic due to change-detection, as if we add `cargo-rerun-if-changed:version`, cargo would rerun every time if the file does not exist, since cargo would expect the file to be generated by the build-script. We could generate it, but that relies on the output of `git describe`, whose dependencies we can only limit to anything in the `.git`-folder, again causing unnecessary build-script runs. Instead, this reads the `FISH_BUILD_VERSION`-env-variable at compile time instead of the `version`-file, and falls back to calling git-describe through the `git_version`-proc-macro. We thus do not need to deal with extraneous build-script running.

- This does not adopt it.

We don't change anything about compilation-setup, we just immediately jump to Rust, making the eventual final swap to a Rust entrypoint very easy. There are some string-usage and format-string differences that are generally quite messy.

This is in regards to a comment on 290d07a, which resulted in 46c9679. Those commits handled the default path when it is unset on startup. DEFAULT_PATH is used when PATH is unset at runtime as far as I can tell. As far as I can tell this has had the non-overidding ordering behavior since inception (or at least 17 years ago ea998b0).

- No need to hard-code a different default

henrikhorluck · 2023-09-04T21:35:49Z

tests/checks/default-setup-path.fish

@@ -0,0 +1,12 @@
+#RUN: %fish -C 'set -g fish %fish' %s
+
+# FIXME: Rationalize behavior when PATH is explicitly unset, should this not behave like PATH=""?


Answering #9990 (comment) by @faho

It is very unlikely that that's what people would expect, and a $PATH of "." is basically unusable. If that's explicitly set, sure, whatever - but an unset $PATH can also be caused by misconfiguration or e.g. a thing that just clears the environment.

$PATH is also something where we should act like other things because it's a system-wide config knob, and other tools also fall back to their default paths - try env -u PATH $shell -c 'echo $PATH', which will print some default for bash, dash and zsh.

IMO: This discussion does not need to be answered now, it is more important to finish the port. I don't think this should block merging this PR, and I don't know why it hasn't been merged yet. If there are any unresolved questions regarding my changes post the initial review I would love to know.

I can open a separate issue and update the comment to link to that. Is that a satisfactionary interim solution?

I think it would make sense to mark the comment I am answering as off-topic, as the change would be introduced by this PR, and not the one that was commented on.

Would love to hear if you have a specific example of a situation where you would (un)intentionally unset PATH. I am not familiar enough with this situation to determine what is the expected behaviour — hence the comment. ksh and tcsh appears to not set a default PATH, not that those are very relevant.

If this only happens due to misconfigurations, or using fish in non-recommended situations, I think it would be in the spirit of the fi in fish to still have a default but also print a warning message.

If unsetting PATH is done as a way to reset the environment, shouldn't we then nudge the user in the direction of --no-config + PATH=(getconf PATH)?

IMO: This discussion does not need to be answered now, it is more important to finish the port. I don't think this should block merging this PR

Just to be clear: It doesn't block the PR. It's a note about a misunderstanding I've seen.

I'm not sure why this isn't merged, I think @krobelus, who intended to merge, was just busy.

Or possibly he's just merged it to riir-parser, which I feel woefully unqualified to do anything about. Truth be told I would not have expected it to get that big or be that long-lived.

If unsetting PATH is done as a way to reset the environment, shouldn't we then nudge the user in the direction of --no-config + PATH=(getconf PATH)?

Not something that people do for a specific shell. You might have a process unset $PATH that's three processes up the chain and doesn't know anything about fish.

Fundamentally the PATH="" case is a consequence of what an empty PATH component means, which is the current directory - if you set PATH "" /usr/bin, that is exported as PATH=:/usr/bin, and any empty component is understood to be the current directory. It's not a "default" in any sense, it's just an alternative way to spell PATH=".".

It would be a bad default for an unset PATH with very little use. And since the convention is to use some "proper" default, and we already do, I don't think that a change is helpful.

If this only happens due to misconfigurations, or using fish in non-recommended situations, I think it would be in the spirit of the fi in fish to still have a default but also print a warning message.

We have, over time, moved away from printing a lot of warnings. We used to print a warning in case someone added a $PATH component that didn't exist. Only it turns out that people like adding $PATH components unconditionally (this was before fish_add_path), and people like using ssh and scp - and scp (the old-school version, don't know about the new sftp-based thing) will launch an actual shell and if that prints anything will abort the transfer.

It would even be possible that some ssh implementation unsets PATH and expects the shell to come up with a good default. We would be throwing quite annoying warnings in that case that our users couldn't do anything about.

faho · 2023-09-05T09:39:19Z

Alright I've merged it now, thank you very much!

branchvincent · 2023-09-06T06:18:17Z

fyi, after eacbd61 I'm seeing a garbage __fish_data_dir (causing fish to skip its initialization in share/config.fish):

$ git checkout eacbd6156
$ sudo make install
$ fish_trace=1 /usr/local/bin/fish -c 'set --show __fish_data_dir __fish_sysconf_dir'
> source /Users/branch/.config/fish/config.fish
--> status is-login
--> exit
> set --show __fish_data_dir __fish_sysconf_dir
$__fish_data_dir: set in global scope, unexported, with 1 elements
$__fish_data_dir[1]: |fish|
$__fish_sysconf_dir: set in global scope, unexported, with 1 elements
$__fish_sysconf_dir[1]: |fish|

Note the actual binary seems fine until you mv it somewhere else:

$ fish_trace=1 ./build/fish -c 'set --show __fish_data_dir __fish_sysconf_dir'
> source /Users/branch/.cache/brew/fish--git/share/config.fish
--> set -g IFS \n\ \t
--> ... 
--> ... all expected initialization here
--> ...
> set --show __fish_data_dir __fish_sysconf_dir
$__fish_data_dir: set in global scope, unexported, with 1 elements
$__fish_data_dir[1]: |/Users/branch/.cache/brew/fish--git/share|
$__fish_sysconf_dir: set in global scope, unexported, with 1 elements
$__fish_sysconf_dir[1]: |/Users/branch/.cache/brew/fish--git/etc|

faho · 2023-09-06T06:26:50Z

@branchvincent Have you cleaned your build directory? That was the issue for me.

Just remove it and start anew.

branchvincent · 2023-09-06T07:07:49Z

Hmm, not sure why but still seeing the same even with a fresh clone

$ git clone --depth=1 https://github.com/fish-shell/fish-shell /tmp/fish
$ sudo make -C /tmp/fish install
$ /usr/local/bin/fish -c 'set --show __fish_data_dir'
$__fish_data_dir: set in global scope, unexported, with 1 elements
$__fish_data_dir[1]: |fish|

faho · 2023-09-06T07:52:24Z

Ah, okay, it only happens on install.

Alright, seems we don't set these hard enough. Try d6a6d77.

(also gosh I always forget about our awkward wrapper makefile)

branchvincent · 2023-09-07T01:22:29Z

thanks a lot @faho, looks good now!

henrikhorluck force-pushed the feat/main-in-rust branch 2 times, most recently from 773beaa to 603c5b7 Compare August 18, 2023 15:59

henrikhorluck marked this pull request as ready for review August 18, 2023 16:47

henrikhorluck force-pushed the feat/main-in-rust branch from 9261f13 to 421ad21 Compare August 18, 2023 16:48

henrikhorluck force-pushed the feat/main-in-rust branch from 678fd9f to e3e3cdf Compare August 18, 2023 17:43

faho reviewed Aug 18, 2023

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henrikhorluck force-pushed the feat/main-in-rust branch 2 times, most recently from e0d0ecb to 531da87 Compare August 18, 2023 19:16

faho mentioned this pull request Aug 19, 2023

Implement FLOGF formatting #9966

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henrikhorluck force-pushed the feat/main-in-rust branch 2 times, most recently from 847b3a8 to 285df93 Compare August 20, 2023 14:10

henrikhorluck force-pushed the feat/main-in-rust branch from 285df93 to a5f4a4c Compare August 20, 2023 15:06

henrikhorluck force-pushed the feat/main-in-rust branch 2 times, most recently from a44a6d5 to 45c811c Compare August 21, 2023 07:37

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tests/checks/default-setup-path.fish Outdated Show resolved Hide resolved

henrikhorluck force-pushed the feat/main-in-rust branch 2 times, most recently from 3bbcc02 to bf3b9af Compare August 22, 2023 16:26

henrikhorluck commented Aug 22, 2023

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fish-rust/src/fish.rs Show resolved Hide resolved

henrikhorluck force-pushed the feat/main-in-rust branch from bf3b9af to 7635955 Compare August 25, 2023 21:37

henrikhorluck added 2 commits August 28, 2023 20:24

Make CARGO_MANIFEST_DIR for fish-rust equal to src

9deba62

Forward CMake configs to Cargo

e610843

henrikhorluck added 17 commits August 28, 2023 20:24

Port history::start_private_mode to Rust

435df1e

Make ParsedSource::new pub

235ed04

It will be used from main

Make methods in path not unnecessairly take &mut

7c204d4

Port MISSING_HELP and MISSING (arg)

6e11a36

C++ main used getopt (no w!), which appears to internally print error-messages. The Rust version will use `wgetopter_t`, and therefore needs to print this itself.

Make get_current_exe use impl AsRef<Path>

00badde

- It does not need to require the default to be valid UTF8

Make ConfigPaths store as PathBuf

f6b4a68

- These are paths, we can just store them raw.

Port env_init to Rust

e41ff1e

- This does not adopt it.

Port and adopt main written in Rust

7632dec

We don't change anything about compilation-setup, we just immediately jump to Rust, making the eventual final swap to a Rust entrypoint very easy. There are some string-usage and format-string differences that are generally quite messy.

Remove now unused in C++ hacks

c9ec497

Fully migrate to Rust env_init

833b877

Remove C++ version of start_private_mode

a6b7de2

Add test that confirms behavior when PATH is unset

45be134

Re-use DEFAULT_PATH in setup_path

63bfd1f

- No need to hard-code a different default

henrikhorluck force-pushed the feat/main-in-rust branch from 7635955 to 63bfd1f Compare August 28, 2023 18:24

henrikhorluck commented Sep 4, 2023

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faho merged commit 676c3c9 into fish-shell:master Sep 5, 2023

henrikhorluck deleted the feat/main-in-rust branch September 5, 2023 18:38

zanchey added the rust label Dec 29, 2023

zanchey added this to the fish next-3.x milestone Dec 29, 2023

github-actions bot locked as resolved and limited conversation to collaborators Dec 30, 2024

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Port fish.cpp to Rust #9962

Port fish.cpp to Rust #9962

henrikhorluck commented Aug 18, 2023 •

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henrikhorluck Sep 4, 2023

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branchvincent commented Sep 6, 2023

faho commented Sep 6, 2023

branchvincent commented Sep 6, 2023

faho commented Sep 6, 2023

branchvincent commented Sep 7, 2023

		@@ -0,0 +1,12 @@
		#RUN: %fish -C 'set -g fish %fish' %s

		# FIXME: Rationalize behavior when PATH is explicitly unset, should this not behave like PATH=""?

Port fish.cpp to Rust #9962

Port fish.cpp to Rust #9962

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