diff options
| -rw-r--r-- | sh/profile.d/bc.sh | 22 | ||||
| -rw-r--r-- | sh/shrc.d/bc.sh | 15 |
2 files changed, 33 insertions, 4 deletions
diff --git a/sh/profile.d/bc.sh b/sh/profile.d/bc.sh new file mode 100644 index 00000000..16200b33 --- /dev/null +++ b/sh/profile.d/bc.sh @@ -0,0 +1,22 @@ +# Test that we have metadata about what options this system's bc(1) supports, +# and try to create it if not +( + # Create a directory to hold metadata about bc + bcd=$HOME/.cache/bc + if ! [ -d "$bcd" ] ; then + mkdir -p -- "$bcd" || exit + fi + + # Write bc(1)'s --help output to a file, even if it's empty + if ! [ -f "$bcd"/help ] ; then + bc --help </dev/null >"$bcd"/help 2>/dev/null || exit + + # Iterate through some useful options and create files to show they're + # available + set -- quiet + for opt ; do + grep -q -- --"$opt" "$bcd"/help || continue + touch -- "$bcd"/"$opt" || exit + done + fi +) diff --git a/sh/shrc.d/bc.sh b/sh/shrc.d/bc.sh index 643678ac..41331ff9 100644 --- a/sh/shrc.d/bc.sh +++ b/sh/shrc.d/bc.sh @@ -1,7 +1,14 @@ -# This function is only applicable if bc(1) has the non-POSIX -q option -command bc -q </dev/null >&0 2>&0 || return +# Our ~/.profile should already have made a directory with the supported +# options for us; if not, we won't be wrapping bc(1) with a function at all +[ -d "$HOME"/.cache/bc ] || return -# Don't print the bc(1) welcome message +# Define function proper bc() { - command bc -q "$@" + + # Add --quiet to stop the annoying welcome banner + [ -e "$HOME"/.cache/bc/quiet ] && + set -- --quiet "$@" + + # Run bc(1) with the concluded arguments + command bc "$@" } |