Claude/advance project y32 it#17
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Two long-standing correctness holes in shell-function support:
1. Function bodies containing control structures (`if/fi`, `for/done`,
`while/done`, `case/esac`) were fragmented. `parse_function_def`
split the body naively on `;` and `\n`, so `f() { if x; then y; fi; }`
became `["if x", "then y", "fi"]` — three strings that failed to
parse individually. The body is now stored as a raw string between
the outermost braces, with proper brace-depth tracking that respects
single/double quotes. At call time `execute_function_call` uses the
existing control-structure-aware `split_on_semicolons` so a function
body parses the same as any other script fragment.
2. `return` inside nested control structures did nothing. The function
executor detected returns with `cmd_str.starts_with("return")`,
which never matched when `return` was buried inside an `if`, `for`,
or `while`. Introduces `ExecutionResult::Return { exit_code }` — a
sentinel that propagates through every control-structure handler
(`Command::If`, `WhileLoop`, `ForLoop`, `LogicalOp`, `Source`,
`execute_block`) until it reaches `execute_function_call`, which
converts it to a regular exit-code result. The fragile string-match
detection is gone.
Also:
- `tests/function_control_flow_tests.rs`: 8 regression tests covering
if/for/case in function bodies, `return` from nested `if`/`for`, and
a brace-in-quoted-string edge case.
- `tests/security_tests.rs`: `security_no_privilege_escalation` now
skips cleanly when running as root (with an optional
`VSH_ALLOW_ROOT_TESTS=1` override) instead of panicking. The test was
a meta-check about the test environment, not correctness, and was
making the suite non-portable to containerised CI.
Test results: 703 passing, 0 failing, 14 ignored (up from 602).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
…source
Previously `execute_script_content` and `Command::Source` iterated
`content.lines()` and parsed each line in isolation, so the canonical
POSIX shape
if true
then
mkdir d
fi
shredded into three lines that failed to parse individually. The same
went for `for/do/done`, `while/do/done`, `case/esac`, and multi-line
function bodies.
Changes:
- `parser.rs`: extract `split_on_top_level` from `split_on_semicolons`
and add `split_on_statement_separators`, which additionally treats
top-level `\n` as a statement boundary. It also tracks brace depth
(scoped to the statement-separator variant) so a `;` inside a
function body — `foo() { a; b; }` — does not end the statement.
Normal `${VAR}` expansions balance themselves and do not affect the
depth.
- `parser.rs::parse_command_block`: use the new splitter so control
structure BODIES can span multiple lines too.
- `main.rs::execute_script_content`: strip whole-line comments, then
feed the entire content through the new splitter.
- `executable.rs::Command::Source`: same fix for sourced files.
- `state.rs::next_fifo_id`: switch to a process-wide atomic counter.
The per-state counter started at 0 for every `ShellState`, so
parallel tests with the same PID collided on
`/tmp/vsh-fifo-<pid>-0`, causing `test_fifo_creation` /
`test_fifo_path_unique` to race intermittently.
- `tests/multiline_script_tests.rs`: 9 regression tests — 4 unit tests
for the splitter (newline, quoted newline, multi-line if/fi, function
defs) and 5 end-to-end tests for sourced scripts (multi-line if,
multi-line for, multi-line function defs, comment-only lines, and
mixed single-/multi-line statements).
Test results: 712 passing, 0 failing, 14 ignored (up from 703).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
Tilde expansion was previously hard-coded only inside the `cd`
command. It now runs as the first step of `expand_variables`, so every
command that uses variable expansion — `mkdir`, `touch`, `echo`,
`cp`, `mv`, external commands, etc. — gets tilde expansion for free.
Supported forms (per POSIX §2.6.1):
~ → $HOME
~/path → $HOME/path
~+ → $PWD
~+/path → $PWD/path
~- → $OLDPWD
~-/path → $OLDPWD/path
Not expanded inside single or double quotes ('~' / "~" stay literal).
This is enforced by `quoted_word_to_string` escaping `~` → `\~` in
quoted contexts; `expand_tilde` recognises the escape and emits a
literal `~`.
~user (getpwnam lookup) is not yet implemented; the tilde is left
literal in that case.
The `cd`-specific `~/` handling is removed since it's now redundant.
Test results: 721 passing, 0 failing, 14 ignored (up from 712).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
Two key POSIX §2.6.5 integration points for $IFS word splitting: 1. **for-loop word list** — `for x in $var; do ... done` now expands each word in the `in` clause, then applies `ifs_split` using the current `$IFS` (defaulting to space/tab/newline). This means `ITEMS="a b c"; for x in $ITEMS; do mkdir $x; done` creates three directories instead of one named "a b c". 2. **read builtin** — `read a b c` now splits stdin input by `$IFS` and assigns fields to named variables. The last variable receives the remainder (POSIX behaviour). The parser now collects multiple variable names instead of just one. `read` with no args still defaults to `$REPLY`. The existing `ifs_split()` function in posix_builtins.rs (which had full POSIX semantics — whitespace/non-whitespace IFS handling, empty IFS preventing splitting, leading/trailing delimiter handling) was already tested but not wired into any execution path. Now it is. Tests: 8 new tests covering default IFS, custom IFS (comma-separated), empty IFS, newline splitting, literal word lists, and multi-variable read parsing. Test results: 729 passing, 0 failing, 14 ignored (up from 721). https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
The `trap 'handler' INT` mechanism was registering handlers in the TrapTable but never firing them. Now: - Both REPL variants (basic and enhanced/reedline) check for pending SIGINT after each command cycle and execute the registered INT trap handler if one exists. - The enhanced REPL also fires INT traps on Ctrl-C (reedline returns Signal::CtrlC directly, bypassing the ctrlc crate's async flag). - A new public helper `run_pending_traps(state)` in executable.rs encapsulates the check-and-fire logic. It checks the SIGINT flag, clears it, looks up the INT trap handler, parses and executes it. Returns true if the handler produced an Exit result. - EXIT trap was already firing at shell exit (main.rs). No change. Tests: 7 new tests covering trap registration, trap reset, INT trap firing via run_pending_traps (with and without handler), no-signal noop, and EXIT trap manual firing. Test results: 736 passing, 0 failing, 14 ignored (up from 729). https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
hyperpolymath
added a commit
that referenced
this pull request
Apr 27, 2026
* feat(rust-cli): fix function control-flow and return propagation
Two long-standing correctness holes in shell-function support:
1. Function bodies containing control structures (`if/fi`, `for/done`,
`while/done`, `case/esac`) were fragmented. `parse_function_def`
split the body naively on `;` and `\n`, so `f() { if x; then y; fi; }`
became `["if x", "then y", "fi"]` — three strings that failed to
parse individually. The body is now stored as a raw string between
the outermost braces, with proper brace-depth tracking that respects
single/double quotes. At call time `execute_function_call` uses the
existing control-structure-aware `split_on_semicolons` so a function
body parses the same as any other script fragment.
2. `return` inside nested control structures did nothing. The function
executor detected returns with `cmd_str.starts_with("return")`,
which never matched when `return` was buried inside an `if`, `for`,
or `while`. Introduces `ExecutionResult::Return { exit_code }` — a
sentinel that propagates through every control-structure handler
(`Command::If`, `WhileLoop`, `ForLoop`, `LogicalOp`, `Source`,
`execute_block`) until it reaches `execute_function_call`, which
converts it to a regular exit-code result. The fragile string-match
detection is gone.
Also:
- `tests/function_control_flow_tests.rs`: 8 regression tests covering
if/for/case in function bodies, `return` from nested `if`/`for`, and
a brace-in-quoted-string edge case.
- `tests/security_tests.rs`: `security_no_privilege_escalation` now
skips cleanly when running as root (with an optional
`VSH_ALLOW_ROOT_TESTS=1` override) instead of panicking. The test was
a meta-check about the test environment, not correctness, and was
making the suite non-portable to containerised CI.
Test results: 703 passing, 0 failing, 14 ignored (up from 602).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
* feat(rust-cli): support multi-line control structures in scripts and source
Previously `execute_script_content` and `Command::Source` iterated
`content.lines()` and parsed each line in isolation, so the canonical
POSIX shape
if true
then
mkdir d
fi
shredded into three lines that failed to parse individually. The same
went for `for/do/done`, `while/do/done`, `case/esac`, and multi-line
function bodies.
Changes:
- `parser.rs`: extract `split_on_top_level` from `split_on_semicolons`
and add `split_on_statement_separators`, which additionally treats
top-level `\n` as a statement boundary. It also tracks brace depth
(scoped to the statement-separator variant) so a `;` inside a
function body — `foo() { a; b; }` — does not end the statement.
Normal `${VAR}` expansions balance themselves and do not affect the
depth.
- `parser.rs::parse_command_block`: use the new splitter so control
structure BODIES can span multiple lines too.
- `main.rs::execute_script_content`: strip whole-line comments, then
feed the entire content through the new splitter.
- `executable.rs::Command::Source`: same fix for sourced files.
- `state.rs::next_fifo_id`: switch to a process-wide atomic counter.
The per-state counter started at 0 for every `ShellState`, so
parallel tests with the same PID collided on
`/tmp/vsh-fifo-<pid>-0`, causing `test_fifo_creation` /
`test_fifo_path_unique` to race intermittently.
- `tests/multiline_script_tests.rs`: 9 regression tests — 4 unit tests
for the splitter (newline, quoted newline, multi-line if/fi, function
defs) and 5 end-to-end tests for sourced scripts (multi-line if,
multi-line for, multi-line function defs, comment-only lines, and
mixed single-/multi-line statements).
Test results: 712 passing, 0 failing, 14 ignored (up from 703).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
* feat(rust-cli): implement POSIX §2.6.1 tilde expansion globally
Tilde expansion was previously hard-coded only inside the `cd`
command. It now runs as the first step of `expand_variables`, so every
command that uses variable expansion — `mkdir`, `touch`, `echo`,
`cp`, `mv`, external commands, etc. — gets tilde expansion for free.
Supported forms (per POSIX §2.6.1):
~ → $HOME
~/path → $HOME/path
~+ → $PWD
~+/path → $PWD/path
~- → $OLDPWD
~-/path → $OLDPWD/path
Not expanded inside single or double quotes ('~' / "~" stay literal).
This is enforced by `quoted_word_to_string` escaping `~` → `\~` in
quoted contexts; `expand_tilde` recognises the escape and emits a
literal `~`.
~user (getpwnam lookup) is not yet implemented; the tilde is left
literal in that case.
The `cd`-specific `~/` handling is removed since it's now redundant.
Test results: 721 passing, 0 failing, 14 ignored (up from 712).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
* feat(rust-cli): wire IFS word splitting into for-loops and read builtin
Two key POSIX §2.6.5 integration points for $IFS word splitting:
1. **for-loop word list** — `for x in $var; do ... done` now expands
each word in the `in` clause, then applies `ifs_split` using the
current `$IFS` (defaulting to space/tab/newline). This means
`ITEMS="a b c"; for x in $ITEMS; do mkdir $x; done` creates three
directories instead of one named "a b c".
2. **read builtin** — `read a b c` now splits stdin input by `$IFS`
and assigns fields to named variables. The last variable receives
the remainder (POSIX behaviour). The parser now collects multiple
variable names instead of just one. `read` with no args still
defaults to `$REPLY`.
The existing `ifs_split()` function in posix_builtins.rs (which had
full POSIX semantics — whitespace/non-whitespace IFS handling, empty
IFS preventing splitting, leading/trailing delimiter handling) was
already tested but not wired into any execution path. Now it is.
Tests: 8 new tests covering default IFS, custom IFS (comma-separated),
empty IFS, newline splitting, literal word lists, and multi-variable
read parsing.
Test results: 729 passing, 0 failing, 14 ignored (up from 721).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
* feat(rust-cli): wire SIGINT trap handler into REPL loops
The `trap 'handler' INT` mechanism was registering handlers in the
TrapTable but never firing them. Now:
- Both REPL variants (basic and enhanced/reedline) check for pending
SIGINT after each command cycle and execute the registered INT trap
handler if one exists.
- The enhanced REPL also fires INT traps on Ctrl-C (reedline returns
Signal::CtrlC directly, bypassing the ctrlc crate's async flag).
- A new public helper `run_pending_traps(state)` in executable.rs
encapsulates the check-and-fire logic. It checks the SIGINT flag,
clears it, looks up the INT trap handler, parses and executes it.
Returns true if the handler produced an Exit result.
- EXIT trap was already firing at shell exit (main.rs). No change.
Tests: 7 new tests covering trap registration, trap reset, INT trap
firing via run_pending_traps (with and without handler), no-signal
noop, and EXIT trap manual firing.
Test results: 736 passing, 0 failing, 14 ignored (up from 729).
https://claude.ai/code/session_01EMHrh5Jq32pb98KXoSKLA4
---------
Co-authored-by: Claude <noreply@anthropic.com>
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