ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/civetweb/resources/complete.lua

   1 #!/usr/bin/lua5.2
   2
   3 -- CivetWeb command line completion for bash
   4
   5 --[[ INSTALLING:
   6
   7 To use auto-completion for bash, you need to define a command for the bash built-in
   8 [*complete*](https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion-Builtins.html).
   9
  10 Create a file called "civetweb" in the completion folder.
  11 Depending on Linux distribution and version, this might be
  12 /usr/share/bash-completion/completions/, /etc/bash_completion or another folder.
  13
  14 The file has to contain just one line:
  15 complete -C /path/to/civetweb/resources/complete.lua civetweb
  16
  17 The complete command script is implemented in this file.
  18 It needs Lua 5.2 to be installed (for Debian based systems: "sudo apt-get install lua5.2").
  19 In case lua5.2 is not located in /usr/bin/lua5.2 (see "which lua5.2"),
  20 the first line (#!) needs to be adapted accordingly.
  21
  22 --]]
  23
  24 ---------------------------------------------------------------------------------------------------
  25
  26 -- The bash "complete -C" has an awkward interface:
  27 -- see https://unix.stackexchange.com/questions/250262/how-to-use-bashs-complete-or-compgen-c-command-option
  28 -- Command line arguments
  29 cmd = arg[1] -- typically "./civetweb" or whatever path was used
  30 this = arg[2] -- characters already typed for the next options
  31 last = arg[3] -- option before this one
  32 -- Environment variables
  33 comp_line = os.getenv("COMP_LINE") -- entire command line
  34 comp_point = os.getenv("COMP_POINT") -- position of cursor (index)
  35 comp_type = os.getenv("COMP_TYPE") -- type:
  36 -- 9 for normal completion
  37 -- 33 when listing alternatives on ambiguous completions
  38 -- 37 for menu completion
  39 -- 63 when tabbing between ambiguous completions
  40 -- 64 to list completions after a partial completion
  41
  42
  43 -- Debug-Print function (must use absolute path for log file)
  44 function dp(txt)
  45   --[[ comment / uncomment to enable debugging
  46   local f = io.open("/tmp/complete.log", "a");
  47   f:write(txt .. "\n")
  48   f:close()
  49   --]]
  50 end
  51
  52 -- Helper function: Check if files exist
  53 function fileexists(name)
  54   local f = io.open(name, "r")
  55   if f then
  56     f:close()
  57     return true
  58   end
  59   return false
  60 end
  61
  62
  63 -- Debug logging
  64 dp("complete: cmd=" .. cmd .. ", this=" .. this .. ", last=" .. last .. ", type=" .. comp_type)
  65
  66
  67 -- Trim command line (remove spaces)
  68 trim_comp_line = string.match(comp_line, "^%s*(.-)%s*$")
  69
  70 if (trim_comp_line == cmd) then
  71   -- this is the first option
  72   dp("Suggest --help argument")
  73   print("--help ")
  74   os.exit(0)
  75 end
  76
  77 is_h = string.find(comp_line, "^%s*" .. cmd .. "%s+%-h%s")
  78 is_h = is_h or string.find(comp_line, "^%s*" .. cmd .. "%s+%--help%s")
  79 is_h = is_h or string.find(comp_line, "^%s*" .. cmd .. "%s+%-H%s")
  80
  81 if (is_h) then
  82   dp("If --help is used, no additional argument is allowed")
  83   os.exit(0)
  84 end
  85
  86 is_a = string.find(comp_line, "^%s*" .. cmd .. "%s+%-A%s")
  87 is_c = string.find(comp_line, "^%s*" .. cmd .. "%s+%-C%s")
  88 is_i = string.find(comp_line, "^%s*" .. cmd .. "%s+%-I%s")
  89 is_r = string.find(comp_line, "^%s*" .. cmd .. "%s+%-R%s")
  90
  91 if (is_i) then
  92   dp("If --I is used, no additional argument is allowed")
  93   os.exit(0)
  94 end
  95
  96 -- -A and -R require the password file as second argument
  97 htpasswd_r = ".htpasswd <mydomain.com> <username>"
  98 htpasswd_a = htpasswd_r .. " <password>"
  99 if (last == "-A") and (this == htpasswd_a:sub(1,#this)) then
 100   dp("Fill with option template for -A")
 101   print(htpasswd_a)
 102   os.exit(0)
 103 end
 104 if (last == "-R") and (this == htpasswd_r:sub(1,#this)) then
 105   dp("Fill with option template for -R")
 106   print(htpasswd_r)
 107   os.exit(0)
 108 end
 109 if (is_a or is_r) then
 110   dp("Options -A and -R have a fixed number of arguments")
 111   os.exit(0)
 112 end
 113
 114 -- -C requires an URL, usually starting with http:// or https://
 115 http = "http://"
 116 if (last == "-C") and (this == http:sub(1,#this)) then
 117   print(http)
 118   print(http.. "localhost/")
 119   os.exit(0)
 120 end
 121 http = "https://"
 122 if (last == "-C") and (this == http:sub(1,#this)) then
 123   print(http)
 124   print(http.. "localhost/")
 125   os.exit(0)
 126 end
 127 if (is_c) then
 128   dp("Option -C has just one argument")
 129   os.exit(0)
 130 end
 131
 132
 133 -- Take options directly from "--help" output of executable
 134 optfile = "/tmp/civetweb.options"
 135 if not fileexists(optfile) then
 136   dp("options file " .. optfile .. " missing")
 137   os.execute(cmd .. " --help > " .. optfile .. " 2>&1")
 138 else
 139   dp("options file " .. optfile .. " found")
 140 end
 141
 142 for l in io.lines(optfile) do
 143   local lkey, lval = l:match("^%s+(%-[^%s]*)%s*([^%s]*)%s*$")
 144   if lkey then
 145     local thislen = string.len(this)
 146     if (thislen>0) and (this == lkey:sub(1,thislen)) then
 147       print(lkey)
 148       dp("match: " .. lkey)
 149       keymatch = true
 150     end
 151     if last == lkey then
 152       valmatch = lval
 153     end
 154   end
 155 end
 156
 157 if keymatch then
 158   -- at least one options matches
 159   os.exit(0)
 160 end
 161
 162 if valmatch then
 163   -- suggest the default value
 164   print(valmatch)
 165   os.exit(0)
 166 end
 167
 168 -- No context to determine next argument
 169 dp("no specific option")
 170 os.exit(0)
 171