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rc/sh/stfu

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#!/usr/bin/env sh
# YES_ZSH
#. ~/sh/echo2 # FIXME
#. ~/sh/note # FIXME
stfu() { ### @-
### invoke a command, silencing stdout and stderr *unless* the command fails.
###
### **NOTE:** don't use `stfu` for handling sensitive data or commands!
### use it for 7zip.
###
### ```
### $ touch butts
### $ stfu 7z a butts.7z butts
### $ stfu 7z a butts.7z asses
### command failed with exit status 1:
### 7z a butts.7z asses
###
### $ tail -n 20 /tmp/stfu/out_1627834220
### Solid = -
### Blocks = 0
###
### Scanning the drive:
### 0 files, 0 bytes
###
### Updating archive: butts.7z
###
### Keep old data in archive: 1 file, 0 bytes
### Add new data to archive: 0 files, 0 bytes
###
###
### Files read from disk: 0
### Archive size: 82 bytes (1 KiB)
###
### Scan WARNINGS for files and folders:
###
### asses : The system cannot find the file specified.
### ----------------
### Scan WARNINGS: 1
###
### $ tail -n 20 /tmp/stfu/err_1627834220
###
### WARNING: The system cannot find the file specified.
### asses
### ```
[ $# -gt 0 ] || { printf "%s\n" "$0: too few arguments" >&2; return 1; }
local temp="${TMP:-/tmp}/stfu"
local time="$(date -u '+%s')"
[ $? -eq 0 ] || { printf "%s\n" "$0: failed to get current time" >&2; return 1; }
mkdir -p "$temp" || { printf "%s\n" "$0: failed to create temp directory" >&2; return 1; }
while [ -e "$temp/out_$time" -o -e "$temp/err_$time" ]; do time=$((time+1)); done
local out="$temp/out_$time"
local err="$temp/err_$time"
#local out="$(mktemp -t -p "$temp" out_XXXXXX)"
#[ $? -eq 0 ] || { printf "%s\n" "$0: failed to create temp file" >&2; return 1; }
#local err="$(mktemp -t -p "$temp" err_XXXXXX)"
#[ $? -eq 0 ] || { printf "%s\n" "$0: failed to create temp file" >&2; return 1; }
local ret=0
"$@" > "$out" 2> "$err" || ret=$?
if [ $ret -ne 0 ]; then
printf "command failed with exit status %s:\n" $ret >&2
echo2 "$@"
echo2
note '$ tail -n 20' "$out"
tail -n 20 "$out" >&2
echo2
note '$ tail -n 20' "$err"
tail -n 20 "$err" >&2
fi
return $ret
}
[ "${SOURCING:-0}" -gt 0 ] || stfu "$@"