Parse the executed command, assessing all variables set via -v or --assign, adding the key/values to an array

get_cli_awk_vars.awk

#!/usr/bin/env awk -f 

#
# THIS IS CURRENTLY BROKEN - im working on it.
#

# Description:  Grabs the fully executed command by using the ps command to find the "args" data
#               for the pid PROCINFO["pid"], then parses it by looking for any awk variables set 
#               using -v or --assign via the execution.
#
# Example Command:
#   awk -v foo=bar --assign baz=quux -f ./get_vars-2.awk
#
# Expected Output:
#   foo = bar
#   baz = qux
#
# Example Command:
#   awk \
#     -v var_1=val_1 \
#     -vvar_2=val_2 \
#     --assign var_3=val_3 \
#     --assign var_4=val_4 \
#     -f ./get_vars-2.awk \
#     -v var_5=val_5 \
#     -vvar_6=val_6 \
#     --assign var_7=val_7 \
#     --assign var_8=val_8 \
#     - \
#     -v var_9=val_9 \
#     -vvar_10=val_10 \
#     --assign var_11=val_11 \
#     --assign var_12=val_12
# 
# Or:
#   awk   -v var_1=val_1   -vvar_2=val_2   --assign var_3=val_3   --assign var_4=val_4   -f ./get_vars-2.awk   -v var_5=val_5   -vvar_6=val_6   --assign var_7=val_7   --assign var_8=val_8   -   -v var_9=val_9   -vvar_10=val_10   --assign var_11=val_11   --assign var_12=val_12
# 
# Expected Output:
#   var_1 = val_1
#   var_2 = val_2
#   var_3 = val_3
#   var_4 = val_4
#   var_5 = val_5
#   var_6 = val_6
#   var_7 = val_7
#   var_8 = val_8
#   var_9 = val_9
#   var_10 = val_10
#   var_11 = val_11
#   var_12 = val_12
#

function getexecuted(){
  ("ps -p " PROCINFO["pid"] " -o args=") | getline exec_command
  return exec_command
}

function list2assoc( arr ){
  for ( a_idx in arr ){ 
    arr[arr[a_idx]] = arr[a_idx]
    delete arr[a_idx]
  }  
}
function _d(msg){
  printf("[DEBUG] %s\n", msg)
}
BEGIN {
  cfg["var_prefixes"] = "-v --assign"

  cli = getexecuted()

  _d("Command Executed: "cli)

  split( cli, cli_segs, " " )
  split( cfg["var_prefixes"], var_prefixes, " " )
  list2assoc( var_prefixes )

  for ( vp in var_prefixes) _d("var prefix: "vp)

  argvars[""] = ""

  last_seg = ""

  for ( cs in cli_segs ) _d("[Pre-loop loop] cli_segs["cs"] = "cli_segs[cs])
  
  # Iterate over cli segments
  for ( cs in cli_segs ){
    _d("--------")
    _d("# NEW CLI SEG ITERATION (#"cs") ")
    _d("===> A cli_segs["cs"] = "cli_segs[cs])
    _d("===> A last_seg = "last_seg)
    _d("Processing segment #"cs" - "cli_segs[cs]" (last_seg = "last_seg")")

    # If the "this=that" segment is found, then redefine varval_combo to said value
    # to later be checked and parsed (reset to "" each time)
    varval_combo = ""

    # If the last seg was a var switch, then set varval_combo
    if ( last_seg in var_prefixes ){
      _d("The last_seg ("last_seg") WAS found to be in var_prefixes - Setting varval_combo to "cli_segs[cs])
      varval_combo = cli_segs[cs]
      _d("===> B cli_segs["cs"] = "cli_segs[cs])
    _d("===> B last_seg = "last_seg)
    }

    
    # Otherwise, see if the current segment has a switch set without a space (EG: -vfoo=bar)
    else {

    _d("===> C cli_segs["cs"] = "cli_segs[cs])
    _d("===> C last_seg = "last_seg)
      _d("The last_seg ("last_seg") was NOT found to be in var_prefixes")
      for ( vpfx in var_prefixes ){

    _d("===> D cli_segs["cs"] = "cli_segs[cs])
    _d("===> D last_seg = "last_seg)
        # Modify the key, prepending a ^
        _p = sprintf( "^%s", var_prefixes[vpfx] )

        # If regex matches, then THIS is a var/key with the switch also
        if ( cli_segs[cs] ~ _p ) 
          # If so, then set varval_combo
          varval_combo = gsub( _p, "", cli_segs[cs] )
        
      }

    _d("===> E cli_segs["cs"] = "cli_segs[cs])
    _d("===> E last_seg = "last_seg)
    }

    _d("Redefining last_seg from "last_seg" to "cli_segs[cs])
    last_seg = cli_segs[cs]
    _d("last_seg: "last_seg)

    if ( varval_combo != "" ){
      _d("varval_combo set to "varval_combo)

      split( varval_combo, var_segs, "=" )

      _d("KEY: "var_segs[1])
      _d("VAL: "var_segs[2])
      argvars[ var_segs[1] ] = var_segs[2]
    }
    
    #_d("Redefining last_seg from "last_seg" to "cli_segs[cs])
    #last_seg = cli_segs[cs]
  }
  for ( av in argvars ){
    if ( av != "" )
      printf("argvar %s was %s\n", av, argvars[av])
  }
}