Module announced_query 

The four top-level spellings after which the wrapper announces itself, and the text it prints once Git has answered. What: Recognize the four top-level spellings after which the wrapper says it is not plain Git (--version, -v, --help, -h), and build the text it prints once Git has answered. Why: A caller who types git --version should be able to tell that a policy wrapper sits in front of Git, without the wrapper changing a single byte of what Git itself printed. Every other query (--exec-path, --html-path, …) stays an exact process replacement.

In TS you’d write (pseudocode):

// const query = announcedQuery(args, globalLayout(args));
// after the child exits: if (outcome === { exited: 0 }) process.stdout.write(announcement(query, version, realGit));

Enums

AnnouncedQuery

Which announced query an invocation is.

Constants

WRAPPER_VERSION

What: The crate version printed in the banner. env! reads a Cargo-provided environment variable while compiling. Why: The banner must name the wrapper build that answered, and the manifest is the one place that version lives.

Functions

announced_query

What: Say whether the query token of an invocation is one of the four announced spellings. Option<AnnouncedQuery> is “the query, or nothing”. Why: The layout already told the caller this is a query and where it sits; only the exact token separates --version from --exec-path. Nothing else is read, so commands that are not queries pay one comparison.

announcement

What: Build the text printed after Git’s own answer. &str borrows the version; &Path borrows the resolved real Git path; the result is owned, line-terminated text. Why: The banner states which wrapper build and which Git answered; the help section also says what the wrapper adds. Building it from plain values keeps it testable without a process. A path that is not UTF-8 prints with replacement characters, because the text is for people.

printable_after

What: The part of the announcement to print for a finished child. The result borrows from text. Why: Git that failed or was killed did not answer, so the caller sees Git’s status and Git’s own diagnostics unchanged.