
Description="Bash"

Categories = {"script", "shell"}

Identifiers=[[ [a-zA-Z_][\w\-]*(?!\w*\/) ]]

Keywords={
  { Id=1,
    List={"case", "in", "esac", "for", "do", "done", "function", "if", "then",
        "fi", "elif", "else", "select", "time", "until", "while"},
  },
  { Id=2,
    List={"source", "alias", "bind", "break", "builtin", "command", "continue",
        "declare", "dirs", "disown", "enable", "export", "fc", "fg", "getopts",
        "hash", "help", "history", "jobs",  "let", "local", "logout", "popd", "printf",
        "pushd", "pwd", "read", "readonly", "return", "set",  "shift", "shopt",
        "suspend", "test", "times", "trap", "type", "ulimit", "umask", "unalias",
        "unset", "wait", "eval", "bg", "cd", "echo", "exec", "exit", "kill"},
  },
  { Id=3,
    List={"ls", "cat", "tac", "rev", "cp", "mv", "rm", "rmdir", "chmod", "mkdir", "ls", "ll",
        "chattr", "ln", "find", "xargs", "expr", "date", "zdump", "time", "touch", "at",
        "batch", "cal", "sleep", "usleep", "hwclock", "clock", "sort", "tsort", "diff",
        "patch", "diff3", "sdiff", "cmp", "comm", "uniq", "expand", "unexpand", "cat",
        "paste", "join", "head", "tail", "grep", "egrep", "zgrep", "look", "sed", "awk",
        "wc", "tr", "fold", "fmt", "ptx", "col", "column", "colrm", "nl", "pr",
        "gettext", "iconv", "recode", "groff", "lex", "yacc", "tar", "shar", "ar",
        "cpio", "gzip", "bzip2", "compress", "uncompress", "zip", "unzip", "sq", "file",
        "which", "whereis", "whatis", "vdir", "shred", "locate", "slocate", "strings",
        "basename", "dirname", "split", "sum", "cksum", "md5sum", "sha1sum", "uuencode",
        "uudecode", "crypt", "make", "install", "more", "less", "host", "vrfy",
        "nslookup", "dig", "traceroute", "ping", "whois", "finger", "ftp", "uucp",
        "telnet", "rlogin", "rsh", "rcp", "ssh", "write", "mail", "vacation", "tput",
        "reset", "clear", "script", "factor", "bc", "dc", "jot", "seq", "yes", "banner",
        "printenv", "lp", "tee", "mkfifo", "pathchk", "dd", "od", "hexdump", "m4"},
  },

  -- fixes issue with expressions like ${SHELL="${CONFIG_SHELL-/bin/sh}"}
  -- the [^\}]+ part fixes issue with "s#@PATH@#/opt/${pkgname}/bin/# ${pkgdir}/etc/profile.d/${pkgname}.sh"
  { Id=4,
    Regex=[[\$\{[^\}]+\$\{.+?\}.+?\}|\$\{.+?\} ]],
  },
  { Id=4,
    Regex=[[ \$[\w\#]+ ]],
  },
  { Id=2,
    Regex=[[ \s(\-\-?[\w\-]+) ]],
  },

  --see OnStateChange
  { Id=5,
    Regex=[[ \*\[.*?\]\* ]],
  }
}

-- hereDoc opening delimiter, see OnStateChange to handle end of string
Strings={
  Delimiter=[[<<[\-]?\s*["']?\s*[A-Za-z_]+["']?|"|`|']],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[#]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-|\|]]

-- state vars for nested command substitution tracking
cmdSubStack = {}

function OnStateChange(oldState, newState, token, kwClass)

  if oldState == HL_STRING and token == hereDoc then
    hereDoc = nil
    return HL_STRING_END
  end

  --handling for nested command substitution within strings

  if oldState == HL_STRING then

    cmdSubStart = string.find(token, "%$%(")
    if cmdSubStart and cmdSubStack ~= nil then
      table.insert(cmdSubStack, {depth = #cmdSubStack + 1, inString = true})
      return HL_STRING
    end

    cmdSubEnd = string.find(token, "%)")
    if cmdSubEnd and cmdSubStack ~= nil and #cmdSubStack > 0  then
      table.remove(cmdSubStack)
      return HL_STRING
    end

    if cmdSubStack ~= nil and #cmdSubStack > 0  then
      quoteStart = string.find(token, '["\']')
      if quoteStart then
        return HL_STRING
      end
    end

  end

  if oldState == HL_STRING and newState ~= HL_STRING then
    if cmdSubStack ~= nil and #cmdSubStack > 0 and string.find(token, "%)") then
      table.remove(cmdSubStack)
      return HL_STRING
    end
  end

  if (string.sub(token,1,1) == "$" )  and oldState == HL_STRING and newState == HL_KEYWORD then
    return HL_INTERPOLATION
  end

  -- fix of code like case $1 in  *[\\\`\"\$]*)
  if  kwClass==5 then
    return HL_OPERATOR
  end

  if hereDoc~=nil then
    return HL_STRING
  end

  --recognize hereDoc multine strings
  if oldState==HL_STANDARD and newState==HL_STRING  then
    hereDoc = string.match(token, "<<%-?%s*%'?([%-%a%d_]+)" )
  end

  return newState
end
