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run_command_substitution

zsh::ported::exec

Function run_command_substitution 

Source 
pub fn run_command_substitution(cmd: &str) -> String
Expand description

!!! WARNING: RUST-ONLY HELPER !!!

No function of this name exists in Src/exec.c. This helper stands in for running a $(...) body in-process on the live fusevm executor. C forks and calls entersubsh(ESUB_PGRP|ESUB_NOMONITOR, NULL) inside getoutput (c:4713); the in-process form applies that subshell state with a guard instead. Run a $(...) command substitution on the live executor, returning captured stdout. Empty string when no executor is in scope.

The body runs IN-PROCESS (no fork), so the subshell state that Src/exec.c:4781’s entersubsh(ESUB_PGRP|ESUB_NOMONITOR, NULL) would have installed in the forked child is applied here by SubshStateGuard and unwound when the substitution returns. Every caller of this funnel — getoutput above and the p10k custom-segment renderer (extensions/p10k/segments_core.rs:917, which is content="$(eval $command)") — is a genuine command substitution and wants it.