Add support for backquoated commands as command arguments

1 files changed, 44 insertions, 0 deletions

diff --git a/apps/nshlib/Kconfig b/apps/nshlib/Kconfig
index 2a96b851b..7d12d4d65 100644
--- a/apps/nshlib/Kconfig
+++ b/apps/nshlib/Kconfig
@@ -277,6 +277,34 @@ config NSH_DISABLE_SEMICOLON
 		command separated by a semicolon.  You can disable this feature to
 		save a little memory on FLASH challenged platforms.
 
+config NSH_FUNCPARMS
+	bool "Enable function parameters"
+	default n
+	---help---
+		If selected, then the output from cmds, from file applications, and
+		from NSH built-in commands can be used as arguments to other
+		commands.  The entity to be executed is identified by enclosing the
+		command line in back quotes.  For example,
+
+			set FOO `myprogram $BAR`
+
+		Will execute the program named myprogram passing it the value of the
+		environment variable BAR.  The value of the environment variable FOO
+		is then set output of myprogram on stdout.
+
+		This feature is disabled by default.
+
+config NSH_TMPDIR
+	string "Temporary file directory"
+	default "/tmp"
+	depends on NSH_FUNCPARMS
+		---help---
+		If NSH_FUNCPARMS is selected, then function output will be retained
+		in a temporary file.  In that case, this string must be provided to
+		specify the full path to a directory where temporary files can be
+		created.  This would be a good application of RAM disk: To provide
+		temporary storage for function output.
+
 config NSH_MAXARGUMENTS
 	int "Maximum number of command arguments"
 	default 6
@@ -284,6 +312,22 @@ config NSH_MAXARGUMENTS
 		The maximum number of NSH command arguments.
 		Default: 6
 
+config NSH_ENVCAT
+	bool "Concatenation of environment variables"
+	default n
+	---help---
+		Support concatenation of strings with environment variables.  For
+		example:
+
+			set FOO XYZ
+			set BAR 123
+			set FOOBAR ABC_${FOO}_${BAR}
+
+		would set the environment variable FOO to XYZ, BAR to 123 and FOOBAR
+		to ABC_XYZ_123.  If NSH_ENV, then a slightly small FLASH footprint
+		results but then also only simple environment variables like $FOO
+		can be used on the command line.
+
 config NSH_NESTDEPTH
 	int "Maximum command nesting"
 	default 3