Crate sley_submodule 

sley-submodule — shared submodule engine for sley.

Centralizes two pieces of submodule logic that git keeps in submodule-config.c and submodule.c, and that sley previously scattered across the 1850-line submodule CLI command and ~14 ad-hoc .gitmodules walks:

• config — typed .gitmodules parsing (submodule-config.c): a config::SubmoduleConfigSet of typed config::Submodule entries, plus the check_submodule_name / check_submodule_url security checks and the recurse-mode / update-strategy enums.
• [relative_url] — the .gitmodules-url → concrete-url resolution (remote.c::relative_url + submodule--helper.c::resolve_relative_url). submodule init / sync / add all route their relative-url math through this one primitive so every git URL form (ssh, scp-style, file://, helper, relative local path) resolves byte-for-byte the way upstream does.
• update_strategy — the submodule update mode resolver (submodule--helper.c::determine_submodule_update_strategy): picks ONE of checkout/merge/rebase/command/none from the CLI-flag → .git/config → .gitmodules → default-checkout precedence, with the just_cloned downgrade. submodule update routes every mode through this one resolver.
• move_head — the move-head / verify-clean primitives (submodule.c::submodule_move_head dry-run path + the unpack-trees.c wrappers check_submodule_move_head / verify_clean_submodule). These are the hooks the tree-switch (unpack-trees) engine calls to decide whether a HEAD move would lose submodule work.

The two halves are paired on purpose: a tree-switch needs the typed config (to know which paths are submodules and their bindings) AND the move-head check (to know whether moving each one is safe).

Re-exports

pub use config::ParseWarning;

pub use config::RecurseMode;

pub use config::Submodule;

pub use config::SubmoduleConfigSet;

pub use config::UpdateStrategy;

pub use config::UpdateType;

pub use config::check_submodule_name;

pub use config::check_submodule_url;

pub use config::looks_like_command_line_option;

pub use config::parse_fetch_recurse;

pub use config::parse_update_strategy;

pub use config::parse_update_type;

pub use config::update_type_to_string;

pub use move_head::MoveHeadContext;

pub use move_head::MoveHeadFlags;

pub use move_head::MoveHeadVerdict;

pub use move_head::check_move_head;

pub use move_head::check_submodule_move_head;

pub use move_head::verify_clean_submodule;

pub use relative_url::relative_url;

pub use relative_url::resolve_relative_url;

pub use update_strategy::determine_update_strategy;

Modules

config

Typed .gitmodules configuration — a Rust port of git’s submodule-config.c.

move_head

Submodule move-head / verify-clean primitives — a Rust port of the verification half of git’s submodule.c::submodule_move_head plus the unpack-trees.c wrappers check_submodule_move_head and verify_clean_submodule.

relative_url

Relative submodule URL resolution — a Rust port of git’s remote.c relative_url and its helpers (chop_last_dir, url_is_local_not_ssh, is_absolute_path).

update_strategy

Submodule update-strategy resolution — a Rust port of git’s builtin/submodule--helper.c::determine_submodule_update_strategy plus the per-strategy execution dispatch (run_update_command).