Add FFOO_PRETTY_USAGE mode 'subcommand'

src/include/pretty.sh

@@ -12,6 +12,11 @@ ffoo import exit
 #
 FFOO_PRETTY=${FFOO_PRETTY:-plain}
 
+#
+# Usage mode -- set to 'subcommand' to remove first dash
+#
+FFOO_PRETTY_USAGE=${FFOO_PRETTY_USAGE:-}
+
 
 __ffoo_pretty__init() {
     #
@@ -104,6 +109,12 @@ usage_is() {
     #
     # Use "--" to delimit end of arguments processed by usage_is.
     #
+    # Setting FFOO_PRETTY_USAGE to 'subcommand' has effect that
+    # in each call, first hyphen in the script's "own" name is
+    # replaced by space; this is used for git-like sub-commands,
+    # where the actual binary name is e.g. "git-add" for
+    # "git add".
+    #
     # Recommended usage is to define usage() in your script and
     # use this in its body.  That way you only need to define
     # usage patterns once and skip to them from any place where
@@ -313,9 +324,14 @@ __echo_usage() {
     #
     # Print each argument as usage pattern
     #
+    local self
+    case "$FFOO_PRETTY_USAGE" in
+        subcommand) self="${caller/-/ }" ;;
+        *)          self="$caller" ;;
+    esac
     local u
     for u in "$@";
-    do echo "usage: $caller $u"
+    do echo "usage: $self $u"
     done
 }