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Ideas for internal structure doc
* Overview of Lmod structure.
** The work of main() in lmod (or lmod.in.lua in source tree) breaks into 3 parts
*** Process command line and options
**** commands are read in an evaluated. Command can be abbreviated.
So the avail command can be any number of character with a
minimum of 2. So "av" or "ava" will work as avail but "avi" will
not because it doesn't match "avail". See the array lmodCmdA for
details.
**** Some options like --version, --dumpversion and --help
require no command processing so they are evaluated immediately
and Lmod exits.
**** unknown commands output the usage printout to stderr
*** Evaluate module command
The actions of load, unloading etc are collected in the VarT
table. The individual statements like setenv etc produce no
output at this stage.
*** Output the results or error out.
The output of all the changes to the environment, stored in VarT, are written to
stdout in alphabetical order.
Or lmod errors out.
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