Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.

1 files changed, 0 insertions, 443 deletions

diff --git a/lexers/systemd.lua b/lexers/systemd.lua
deleted file mode 100644
index 5f9e618..0000000
--- a/lexers/systemd.lua
+++ /dev/null
@@ -1,443 +0,0 @@
--- Copyright 2016 Christian Hesse
--- systemd unit file LPeg lexer.
-
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
-
-local M = {_NAME = 'systemd'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, l.starts_line(S(';#')) * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local section_word = word_match{
-  'Automount',
-  'BusName',
-  'Install',
-  'Mount',
-  'Path',
-  'Service',
-  'Service',
-  'Socket',
-  'Timer',
-  'Unit'
-}
-local string = token(l.STRING, sq_str + dq_str + '[' * section_word * ']')
-
--- Numbers.
-local dec = l.digit^1 * ('_' * l.digit^1)^0
-local oct_num = '0' * S('01234567_')^1
-local integer = S('+-')^-1 * (l.hex_num + oct_num + dec)
-local number = token(l.NUMBER, (l.float + integer))
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  -- boolean values
-  'true',
-  'false',
-  'on',
-  'off',
-  'yes',
-  'no',
-
-  -- service types
-  'forking',
-  'simple',
-  'oneshot',
-  'dbus',
-  'notify',
-  'idle',
-
-  -- special system units
-  'basic.target',
-  'ctrl-alt-del.target',
-  'cryptsetup.target',
-  'dbus.service',
-  'dbus.socket',
-  'default.target',
-  'display-manager.service',
-  'emergency.target',
-  'exit.target',
-  'final.target',
-  'getty.target',
-  'graphical.target',
-  'hibernate.target',
-  'hybrid-sleep.target',
-  'halt.target',
-  'initrd-fs.target',
-  'kbrequest.target',
-  'kexec.target',
-  'local-fs.target',
-  'multi-user.target',
-  'network-online.target',
-  'paths.target',
-  'poweroff.target',
-  'reboot.target',
-  'remote-fs.target',
-  'rescue.target',
-  'initrd-root-fs.target',
-  'runlevel2.target',
-  'runlevel3.target',
-  'runlevel4.target',
-  'runlevel5.target',
-  'shutdown.target',
-  'sigpwr.target',
-  'sleep.target',
-  'slices.target',
-  'sockets.target',
-  'suspend.target',
-  'swap.target',
-  'sysinit.target',
-  'syslog.socket',
-  'system-update.target',
-  'timers.target',
-  'umount.target',
-
-  -- special system units for devices
-  'bluetooth.target',
-  'printer.target',
-  'smartcard.target',
-  'sound.target',
-
-  -- special passive system units
-  'cryptsetup-pre.target',
-  'local-fs-pre.target',
-  'network.target',
-  'network-pre.target',
-  'nss-lookup.target',
-  'nss-user-lookup.target',
-  'remote-fs-pre.target',
-  'rpcbind.target',
-  'time-sync.target',
-
-  -- specail slice units
-  '-.slice',
-  'system.slice',
-  'user.slice',
-  'machine.slice',
-
-  -- environment variables
-  'PATH',
-  'LANG',
-  'USER',
-  'LOGNAME',
-  'HOME',
-  'SHELL',
-  'XDG_RUNTIME_DIR',
-  'XDG_SESSION_ID',
-  'XDG_SEAT',
-  'XDG_VTNR',
-  'MAINPID',
-  'MANAGERPID',
-  'LISTEN_FDS',
-  'LISTEN_PID',
-  'LISTEN_FDNAMES',
-  'NOTIFY_SOCKET',
-  'WATCHDOG_PID',
-  'WATCHDOG_USEC',
-  'TERM'
-}, '.-'))
-
--- Options.
-local option_word = word_match{
-  -- unit section options
-  'Description',
-  'Documentation',
-  'Requires',
-  'Requisite',
-  'Wants',
-  'BindsTo',
-  'PartOf',
-  'Conflicts',
-  'Before',
-  'After',
-  'OnFailure',
-  'PropagatesReloadTo',
-  'ReloadPropagatedFrom',
-  'JoinsNamespaceOf',
-  'RequiresMountsFor',
-  'OnFailureJobMode',
-  'IgnoreOnIsolate',
-  'StopWhenUnneeded',
-  'RefuseManualStart',
-  'RefuseManualStop',
-  'AllowIsolate',
-  'DefaultDependencies',
-  'JobTimeoutSec',
-  'JobTimeoutAction',
-  'JobTimeoutRebootArgument',
-  'StartLimitInterval',
-  'StartLimitBurst',
-  'StartLimitAction',
-  'RebootArgument',
-  'ConditionArchitecture',
-  'ConditionVirtualization',
-  'ConditionHost',
-  'ConditionKernelCommandLine',
-  'ConditionSecurity',
-  'ConditionCapability',
-  'ConditionACPower',
-  'ConditionNeedsUpdate',
-  'ConditionFirstBoot',
-  'ConditionPathExists',
-  'ConditionPathExistsGlob',
-  'ConditionPathIsDirectory',
-  'ConditionPathIsSymbolicLink',
-  'ConditionPathIsMountPoint',
-  'ConditionPathIsReadWrite',
-  'ConditionDirectoryNotEmpty',
-  'ConditionFileNotEmpty',
-  'ConditionFileIsExecutable',
-  'AssertArchitecture',
-  'AssertVirtualization',
-  'AssertHost',
-  'AssertKernelCommandLine',
-  'AssertSecurity',
-  'AssertCapability',
-  'AssertACPower',
-  'AssertNeedsUpdate',
-  'AssertFirstBoot',
-  'AssertPathExists',
-  'AssertPathExistsGlob',
-  'AssertPathIsDirectory',
-  'AssertPathIsSymbolicLink',
-  'AssertPathIsMountPoint',
-  'AssertPathIsReadWrite',
-  'AssertDirectoryNotEmpty',
-  'AssertFileNotEmpty',
-  'AssertFileIsExecutable',
-  'SourcePath',
-
-  -- install section options
-  'Alias',
-  'WantedBy',
-  'RequiredBy',
-  'Also',
-  'DefaultInstance',
-
-  -- service section options
-  'Type',
-  'RemainAfterExit',
-  'GuessMainPID',
-  'PIDFile',
-  'BusName',
-  'BusPolicy',
-  'ExecStart',
-  'ExecStartPre',
-  'ExecStartPost',
-  'ExecReload',
-  'ExecStop',
-  'ExecStopPost',
-  'RestartSec',
-  'TimeoutStartSec',
-  'TimeoutStopSec',
-  'TimeoutSec',
-  'RuntimeMaxSec',
-  'WatchdogSec',
-  'Restart',
-  'SuccessExitStatus',
-  'RestartPreventExitStatus',
-  'RestartForceExitStatus',
-  'PermissionsStartOnly',
-  'RootDirectoryStartOnly',
-  'NonBlocking',
-  'NotifyAccess',
-  'Sockets',
-  'FailureAction',
-  'FileDescriptorStoreMax',
-  'USBFunctionDescriptors',
-  'USBFunctionStrings',
-
-  -- socket section options
-  'ListenStream',
-  'ListenDatagram',
-  'ListenSequentialPacket',
-  'ListenFIFO',
-  'ListenSpecial',
-  'ListenNetlink',
-  'ListenMessageQueue',
-  'ListenUSBFunction',
-  'SocketProtocol',
-  'BindIPv6Only',
-  'Backlog',
-  'BindToDevice',
-  'SocketUser',
-  'SocketGroup',
-  'SocketMode',
-  'DirectoryMode',
-  'Accept',
-  'Writable',
-  'MaxConnections',
-  'KeepAlive',
-  'KeepAliveTimeSec',
-  'KeepAliveIntervalSec',
-  'KeepAliveProbes',
-  'NoDelay',
-  'Priority',
-  'DeferAcceptSec',
-  'ReceiveBuffer',
-  'SendBuffer',
-  'IPTOS',
-  'IPTTL',
-  'Mark',
-  'ReusePort',
-  'SmackLabel',
-  'SmackLabelIPIn',
-  'SmackLabelIPOut',
-  'SELinuxContextFromNet',
-  'PipeSize',
-  'MessageQueueMaxMessages',
-  'MessageQueueMessageSize',
-  'FreeBind',
-  'Transparent',
-  'Broadcast',
-  'PassCredentials',
-  'PassSecurity',
-  'TCPCongestion',
-  'ExecStartPre',
-  'ExecStartPost',
-  'ExecStopPre',
-  'ExecStopPost',
-  'TimeoutSec',
-  'Service',
-  'RemoveOnStop',
-  'Symlinks',
-  'FileDescriptorName',
-
-  -- mount section options
-  'What',
-  'Where',
-  'Type',
-  'Options',
-  'SloppyOptions',
-  'DirectoryMode',
-  'TimeoutSec',
-
-  -- path section options
-  'PathExists',
-  'PathExistsGlob',
-  'PathChanged',
-  'PathModified',
-  'DirectoryNotEmpty',
-  'Unit',
-  'MakeDirectory',
-  'DirectoryMode',
-
-  -- timer section options
-  'OnActiveSec',
-  'OnBootSec',
-  'OnStartupSec',
-  'OnUnitActiveSec',
-  'OnUnitInactiveSec',
-  'OnCalendar',
-  'AccuracySec',
-  'RandomizedDelaySec',
-  'Unit',
-  'Persistent',
-  'WakeSystem',
-  'RemainAfterElapse',
-
-  -- exec section options
-  'WorkingDirectory',
-  'RootDirectory',
-  'User',
-  'Group',
-  'SupplementaryGroups',
-  'Nice',
-  'OOMScoreAdjust',
-  'IOSchedulingClass',
-  'IOSchedulingPriority',
-  'CPUSchedulingPolicy',
-  'CPUSchedulingPriority',
-  'CPUSchedulingResetOnFork',
-  'CPUAffinity',
-  'UMask',
-  'Environment',
-  'EnvironmentFile',
-  'PassEnvironment',
-  'StandardInput',
-  'StandardOutput',
-  'StandardError',
-  'TTYPath',
-  'TTYReset',
-  'TTYVHangup',
-  'TTYVTDisallocate',
-  'SyslogIdentifier',
-  'SyslogFacility',
-  'SyslogLevel',
-  'SyslogLevelPrefix',
-  'TimerSlackNSec',
-  'LimitCPU',
-  'LimitFSIZE',
-  'LimitDATA',
-  'LimitSTACK',
-  'LimitCORE',
-  'LimitRSS',
-  'LimitNOFILE',
-  'LimitAS',
-  'LimitNPROC',
-  'LimitMEMLOCK',
-  'LimitLOCKS',
-  'LimitSIGPENDING',
-  'LimitMSGQUEUE',
-  'LimitNICE',
-  'LimitRTPRIO',
-  'LimitRTTIME',
-  'PAMName',
-  'CapabilityBoundingSet',
-  'AmbientCapabilities',
-  'SecureBits',
-  'Capabilities',
-  'ReadWriteDirectories',
-  'ReadOnlyDirectories',
-  'InaccessibleDirectories',
-  'PrivateTmp',
-  'PrivateDevices',
-  'PrivateNetwork',
-  'ProtectSystem',
-  'ProtectHome',
-  'MountFlags',
-  'UtmpIdentifier',
-  'UtmpMode',
-  'SELinuxContext',
-  'AppArmorProfile',
-  'SmackProcessLabel',
-  'IgnoreSIGPIPE',
-  'NoNewPrivileges',
-  'SystemCallFilter',
-  'SystemCallErrorNumber',
-  'SystemCallArchitectures',
-  'RestrictAddressFamilies',
-  'Personality',
-  'RuntimeDirectory',
-  'RuntimeDirectoryMode'
-}
-local preproc = token(l.PREPROCESSOR, option_word)
-
--- Identifiers.
-local word = (l.alpha + '_') * (l.alnum + S('_.'))^0
-local identifier = token(l.IDENTIFIER, word)
-
--- Operators.
-local operator = token(l.OPERATOR, '=')
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'string', string},
-  {'preproc', preproc},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-M._LEXBYLINE = true
-
-return M