awk/topgit_branches.awk

   1 #!/usr/bin/awk -f
   2
   3 # topgit_branches - TopGit awk utility script used by tg--awksome
   4 # Copyright (C) 2017 Kyle J. McKay <mackyle@gmail.com>
   5 # All rights reserved.
   6 # License GPLv2
   7
   8 # topgit_branches
   9 #
  10 # variable arguments (-v):
  11 #
  12 #   brfile  if non-empty, the named file gets a copy of the output stream
  13 #   anfile  if non-empty, annihilated branch names are written here
  14 #   noann   if true, omit annihilated branches from output (and brfile)
  15 #   exclbr  whitespace separated list of names to exclude (only from stdout)
  16 #   inclbr  whitespace separated list of names to include (only for stdout)
  17 #
  18 # note that the "noann" variable affects both stdout and, if given, brfile
  19 # but not anfile.
  20 #
  21 # if inclbr is non-empty a branch name must be listed to appear on stdout
  22 # (but brfile, if given, is not affected)
  23 #
  24 # if a branch name appears in exclbr it is omitted from stdout trumping inclbr
  25 # (but brfile, if given, is not affected)
  26 #
  27 # input must be output from awk_ref_prepare (depsblob and msgblob may have any
  28 # setting) after feeding through the correct git --batch-check command
  29 #
  30 # output is one TopGit branch name per line omitting annihilated ones if noann
  31 #
  32 # note that brfile and anfile are both fully written and closed before the
  33 # first line of stdout is written and will be truncated to empty even if there
  34 # are no lines directed to them
  35 #
  36
  37 BEGIN { exitcode = "" }
  38 function exitnow(e) { exitcode=e; exit e }
  39 END { if (exitcode != "") exit exitcode }
  40
  41 BEGIN {
  42         delay = 0
  43         if (anfile != "") {
  44                 printf "" >anfile
  45                 delay=1
  46         }
  47         if (brfile != "") {
  48                 printf "" >brfile
  49                 delay=1
  50         }
  51         inconly = 0
  52         cnt = split(inclbr, scratch, " ")
  53         if (cnt) {
  54                 inconly = 1
  55                 for (i = 1; i <= cnt; ++i) incnames[scratch[i]] = 1
  56         }
  57         cnt = split(exclbr, scratch, " ")
  58         for (i = 1; i <= cnt; ++i) excnames[scratch[i]] = 1
  59         FS = " "
  60         cnt = 0
  61 }
  62
  63 NF == 4 && $4 == ":" && $3 != "" && $2 != "missing" && $1 != "" {
  64         if ((getline bc  + getline hc + \
  65              getline bct + getline hct) != 4) exitnow(2)
  66         split(bc, abc)
  67         split(hc, ahc)
  68         split(bct, abct)
  69         split(hct, ahct)
  70         if (abc[2] != "commit" || ahc[2] != "commit" ||
  71             abct[2] != "tree"  || ahct[2] != "tree") next
  72         if (abct[1] == ahct[1]) {
  73                 if (anfile) print $3 >anfile
  74                 if (noann) next
  75         }
  76         if (brfile) print $3 >brfile
  77         if ((!inconly || incnames[$3]) && !excnames[$3]) {
  78                 if (delay)
  79                         items[++cnt] = $3
  80                 else
  81                         print $3
  82         }
  83 }
  84
  85 END {
  86         if (anfile) close(anfile)
  87         if (brfile) close(brfile)
  88         for (i = 1; i <= cnt; ++i) print items[i]
  89 }