Add newsh script

newsh

@@ -0,0 +1,140 @@
+#!/bin/bash
+# Script to create a new shell script and open it for editing
+
+APP=$(basename $0)
+
+#######################################################################
+# Set default options
+#######################################################################
+NEWSH_SCRIPT_TYPE=bash
+NEWSH_USE_ABS_PATH=0
+NEWSH_NO_EXEC_FLAG=0
+NEWSH_TRUNC_SCRIPT=0
+NEWSH_SCRIPT_FILE=
+
+#######################################################################
+# Usage information
+#######################################################################
+usage()
+{
+    cat <<-EOM
+Usage: $APP OPTIONS <new-shell-script-filename>
+
+OPTIONS
+    -t <type>       Type of script to create (bash/python/ruby/expect)
+    -a              Use absolute path to binary instead of the env wrapper
+    -x              Don't make the file executable
+    -f              Overwrite the script file if it already exists
+    -h              Display this help message
+
+$APP will abort if the specified filename already exists
+EOM
+}
+
+#######################################################################
+# Get path to binary
+#######################################################################
+get_binary_path()
+{
+    local binary=$1
+    local env_path=$(which env)
+    local bin_path=$(which $binary)
+
+    if [[ -z "$bin_path" ]]
+    then
+        echo "$APP: fatal: Cannot find $binary" >&2
+        exit 1
+    fi
+
+    case "$NEWSH_USE_ABS_PATH" in
+    0)
+        # Use env as the path specifier
+        NEWSH_BINARY_PATH="$env_path $binary"
+        ;;
+
+    1)
+        # Use absolute path to the binary as the path specifier
+        NEWSH_BINARY_PATH="$bin_path"
+        ;;
+
+    *)
+        echo "$APP: fatal: Corrupted internal state!" >&2
+        echo "$APP: USE_ABS_PATH=$NEWSH_USE_ABS_PATH" >&2
+        exit 2
+        ;;
+    esac
+}
+
+
+#######################################################################
+# Verify command line switches
+#######################################################################
+while getopts "t:axfh" OPTION
+do
+    case "$OPTION" in
+    h)
+        usage
+        exit 0
+        ;;
+
+    t)
+        NEWSH_SCRIPT_TYPE=$OPTARG
+        ;;
+
+    a)
+        NEWSH_USE_ABS_PATH=1
+        ;;
+
+    x)
+        NEWSH_NO_EXEC_FLAG=1
+        ;;
+
+    f)
+        NEWSH_TRUNC_SCRIPT=1
+        ;;
+
+    \?)
+        exit 1
+        ;;
+
+    :)
+        echo "$APP: Option -$OPTARG requires an argument" >&2
+        exit 1
+        ;;
+    esac
+done
+
+shift $((OPTIND - 1))
+NEWSH_SCRIPT_FILE=$1
+
+if [[ -z "$NEWSH_SCRIPT_FILE" ]]
+then
+    echo "$APP: fatal: Missing script file!" >&2
+    exit 1
+fi
+
+if [[ -e "$NEWSH_SCRIPT_FILE" ]]
+then
+    if [[ "$NEWSH_TRUNC_SCRIPT" == "0" ]]
+    then
+        echo "$APP: fatal: Existing script file $NEWSH_SCRIPT_FILE" >&2
+        exit 1
+    elif [[ "$NEWSH_TRUNC_SCRIPT" == "1" ]]
+    then
+        echo "$APP: overwriting existing script file $NEWSH_SCRIPT_FILE" >&2
+    fi
+fi
+
+get_binary_path $NEWSH_SCRIPT_TYPE
+(cat <<-EOF
+#!$NEWSH_BINARY_PATH
+# Autogenerated by $APP on $(date +%F) at $(date +%T%z)
+
+EOF
+) > "$NEWSH_SCRIPT_FILE"
+
+# Check and make file executable
+if [[ "$NEWSH_NO_EXEC_FLAG" == "0" ]]
+then
+    chmod +x "$NEWSH_SCRIPT_FILE"
+fi