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fix(bash): Count jobs with for loop to fix MacOS count issue (#2250)

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In #1897 we replaced a 'wc -l' with a bash-native job counter, but
subsequently discovered that bash on MacOS folds '<<<' output into
a single line, preventing line counting.

A for loop works around that problem, is still bash-native, and works
on Linux as well.

While we're at it, also removed the need for command substitution and
an echo by doing the work directly on NUM_JOBS.

Fixes #2241.
This commit is contained in:
Rich Lafferty 2021-01-31 16:56:06 -05:00 committed by GitHub
parent 383d2df580
commit 3127a9aa87
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1 changed files with 3 additions and 3 deletions
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6
src/init/starship.bash
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@ -31,11 +31,11 @@ starship_precmd() {
# Save the status, because commands in this pipeline will change $?
STARSHIP_CMD_STATUS=$?
local NUM_JOBS
local NUM_JOBS=0
# Evaluate the number of jobs before running the preseved prompt command, so that tools
# like z/autojump, which background certain jobs, do not cause spurious background jobs
# to be displayed by starship. Also avoids forking to run `wc`, slightly improving perf
NUM_JOBS=$(n=0; while read line; do [[ $line ]] && n=$((n+1));done <<< $(jobs -p) ; echo $n)
# to be displayed by starship. Also avoids forking to run `wc`, slightly improving perf.
for job in $(jobs -p); do [[ $job ]] && ((NUM_JOBS++)); done
# Run the bash precmd function, if it's set. If not set, evaluates to no-op
"${starship_precmd_user_func-:}"