Apply runtime shebanging to POSIX shell

1 files changed, 33 insertions, 0 deletions

diff --git a/bin/ap.sh b/bin/ap.sh
new file mode 100644
index 00000000..1d6376cc
--- /dev/null
+++ b/bin/ap.sh
@@ -0,0 +1,33 @@
+# Run a program with args read from standard input, prompted if from term
+if [ "$#" -eq 0 ] ; then
+    printf >&2 'ap: Need at least one argument (command name)\n'
+    exit 2
+fi
+
+# Get the command name and shift it off
+cmd=$1
+shift
+
+# Iterate through the remaining args; it's legal for there to be none, but in
+# that case the user may as well just have invoked the command directly
+for arg ; do
+
+    # If this is the first iteration, clear the params away (we grabbed them in
+    # the for statement)
+    if [ -z "$reset" ] ; then
+        set --
+        reset=1
+    fi
+
+    # If stdin is a terminal, prompt with the name of the argument
+    if [ -t 0 ] ; then
+        printf '%s: ' "$arg"
+    fi
+
+    # Note that a whitespace or even empty argument is allowed
+    IFS= read -r val
+    set -- "$@" "$val"
+done
+
+# Execute the command with the given parameters
+exec "$cmd" "$@"