Allow empty string as flag argument

Author: wolfgang42

examples/commands/test.sh

@@ -17,3 +17,4 @@ bashly generate
 ./cli upload --help
 ./cli upload sourcefile
 ./cli upload sourcefile -u username
+./cli upload sourcefile -u username -p ''

lib/bashly/views/flag/case.erb

@@ -1,7 +1,7 @@
 # :flag.case
 <%= aliases.join " | " %> )
 % if arg
-  if [[ $2 ]]; then
+  if [[ -n ${2+x} ]]; then
     args[<%= name %>]="$2"
     shift
     shift

spec/approvals/examples/commands

@@ -116,3 +116,11 @@ missing required flag: --user, -u USER
 args:
 - ${args[source]} = sourcefile
 - ${args[--user]} = username
++ ./cli upload sourcefile -u username -p ''
+# this file is located in 'src/upload_command.sh'
+# code for 'cli upload' goes here
+# you can edit it freely and regenerate (it will not be overwritten)
+args:
+- ${args[--password]} = 
+- ${args[source]} = sourcefile
+- ${args[--user]} = username

spec/fixtures/workspaces/flag-args-with-dash/argflag

@@ -142,7 +142,7 @@ parse_requirements() {
 
     # :flag.case
     --options | -o )
-      if [[ $2 ]]; then
+      if [[ -n ${2+x} ]]; then
         args[--options]="$2"
         shift
         shift