[Xen-devel] [PATCH 1/8] Add core.sh and wrapper function

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

Add core functionality and an executable to run it

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
CC: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
 lib/core.sh | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 raise       |  16 +++++++
 2 files changed, 163 insertions(+)
 create mode 100644 lib/core.sh
 create mode 100755 raise

diff --git a/lib/core.sh b/lib/core.sh
new file mode 100644
index 0000000..46b02e0
--- /dev/null
+++ b/lib/core.sh
@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+
+RAISIN_HELP=()
+
+# Core calling convention functionality
+# 
+# $arg_parse
+#
+#   Parse $@.  Begin with every element that a '=' in it being treated
+#   as a variable assignment: declare the LHS a local variable and set
+#   it to the RHS.  Once you reach an element without a '=' in it, or
+#   a '--', put all further elements into the array args.
+# 
+# $requireargs VARNAME1 [VARNAME2, ...]
+#
+#   Check to see that VARNAME1 is defined, and throw an error if not.
+#
+# default VARNAME "VALUE" ; $default_post
+#
+#   Check to see is VARNAME is defined; if not, declare it a local
+#   variable and set it to VALUE.
+#
+# Example usage:
+#
+#   function log()
+#   {
+#       local i;
+#
+#       $arg_parse
+#
+#       default tmpdir "/tmp"; $default_post
+#
+#       $requireargs filename
+#
+#       for $i in ${args[@]} ; do
+#           echo "$i" > $tmpdir/$filename
+#       done
+#
+#       [[ -n "$flower" ] && echo $flower
+#   }
+
+arg_parse_cmd=\
+"local -a args;
+local _a;
+local _vn;
+local _m;
+
+_m=true;
+
+for _a in \"\$@\" ; do
+    false && echo \"Evaluating \${_a} [[ \"\${_a/=}\" = \"\${_a}\" ]]\";
+    if \$_m && [[ \"\${_a/=}\" != \"\${_a}\" ]] ; then
+        false && echo Parameter;
+        _vn=\${_a%%=*};
+        eval \"local \$_vn\";
+        eval \"\$_a\";
+    elif \$_m && [[ \"\${_a}\" == \"--\" ]] ; then
+        false && echo Separator;
+        _m=false;
+    else
+        false && echo Argument;
+        _m=false;
+        args+=(\"\$_a\");
+    fi;
+done"
+
+arg_parse="eval $arg_parse_cmd"
+
+# Pass in either the current function name, or the name of the script
+requireargs="eval _func=\"\$FUNCNAME\" ; eval [[ -n \\\"\$_func\\\" ]] || 
_func=\$0 ; eval _require-args \$_func"
+
+function _require-args()
+{
+    local _arg
+    local _args
+
+    _args=($@)
+
+    for _arg in ${_args[@]:1} ; do
+       eval "[[ -n \"\${$_arg}\" ]] || fail \"${_args[0]}: Missing $_arg\""
+    done
+}
+
+function default()
+{
+    # l0: eval i="5"
+    # l1: default_post="eval $1=\"$2\""
+    # l3: eval "if [[ -z \"\$$1\" ]] ; then default_post=\"eval 
\$1=\\\"$2\\\"\" ; fi"
+    eval "if [[ -z \"\$$1\" ]] ; then default_post=\"eval local 
\$1=\\\"$2\\\"\" ; else unset default_post ; fi"
+}
+
+function fail()
+{
+   echo FATAL "$@" 1>&2
+   [[ -n "$fail_cleanup" ]] && $fail_cleanup
+   exit 1
+}
+
+function info()
+{
+   echo INFO "$@" 1>&2
+}
+
+function error()
+{
+   echo ERROR "$@" 1>&2
+}
+
+RAISIN_HELP+=("help            List available commands")
+function help()
+{
+    echo "Usage: $0 command [arguments...]"
+    echo "  Run '$0 help' for a list of commands, or '$0 command-help' for"
+    echo "  help on a particular command."
+    echo
+
+    for i in "${RAISIN_HELP[@]}" ; do
+       echo "$i"
+    done
+
+    echo
+
+    exit 0
+}
+
+function cmdline()
+{
+    local cmd;
+
+    [[ "$#" -eq "0" ]] && help
+
+    $arg_parse
+
+    # If the command is not defined, then print help and exit
+    if ! type "${args[0]}" 2>/dev/null | grep -q 'function' ; then
+       echo "Unknown function: ${args[0]}"
+       echo
+       help
+    fi
+
+    info Running "${args[0]}"
+    "${args[0]}" "${args[@]:1}" || exit 1
+
+    if ! [[ -z "$RET" ]] ; then
+       echo $RET
+    fi
+}
diff --git a/raise b/raise
new file mode 100755
index 0000000..7f3faae
--- /dev/null
+++ b/raise
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# Include your defaults
+if [[ -e "./config" ]] ; then
+    . ./config
+fi
+
+# To use this as a library, set RAISIN_PATH appropriately
+[[ -z "$RAISIN_PATH" ]] && RAISIN_PATH="$PWD/lib"
+
+# Then as many as the sub-libraries as you need
+. ${RAISIN_PATH}/core.sh
+
+# And do your own thing rather than running commands
+# I suggest defining a "main" function of your own and running it like this.
+cmdline "$@"
-- 
1.9.1


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