Before this patch, let only shows string and array variables, whilst
all mapping types are not shown. In addition, string and array variables
are separated from each other by comments.
This patch implements a new function on shell::Variables that returns
all the variables in scope and then modifies Shell::list_vars to print
all the variables. The syntax returned is equivalent to the method of
declaring the variables themselves, however this still results in
mapping types being indistinguishable from each other by looking at the
output of let (both HashMap and BTreeMap look the same).
Example
Current
# String Variables
HISTORY_SIZE = 1000
HISTFILE_SIZE = 100000
HISTORY_TIMESTAMP = 0
PID = 35715
CMD_DURATION = 91827
UID = 501
? = 0
EUID = 501
HISTFILE_ENABLED = 1
# Array Variables
HISTORY_IGNORE = [ 'no_such_command' , 'whitespace' , 'duplicates' ]
args = [ '-ion' ]
CDPATH = [ ]New
HISTFILE_SIZE = 100000
HISTORY_IGNORE = [ 'no_such_command', 'whitespace', 'duplicates' ]
args = [ 'target/debug/ion' ]
CDPATH = [ ]
? = 0
PID = 50741
UID = 501
HISTORY_SIZE = 1000
EUID = 501
HISTORY_TIMESTAMP = 0
HISTFILE_ENABLED = 1
CMD_DURATION = 0
icon = [ 'c'='d', 'a'='b', 'b'='c' ]