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util/argparse.lua

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util/argparse.lua @ 13270:14bbfb2cc8dd default tip

lint: Teach luacheck about module:once Silence warning for using this introduced in 9c62ffbdf2ae
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 16:43:14 +0200
parent 13160:4ee9a912ceea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1196f1e8d178 util.startup: Break out command line argument parsing into util.argparse
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1 local function parse(arg, config)
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2 local short_params = config and config.short_params or {};
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3 local value_params = config and config.value_params or {};
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4 local array_params = config and config.array_params or {};
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5
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6 local parsed_opts = {};
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7
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8 if #arg == 0 then
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9 return parsed_opts;
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10 end
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11 while true do
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12 local raw_param = arg[1];
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13 if not raw_param then
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14 break;
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15 end
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16
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17 local prefix = raw_param:match("^%-%-?");
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18 if not prefix then
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19 break;
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20 elseif prefix == "--" and raw_param == "--" then
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21 table.remove(arg, 1);
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22 break;
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23 end
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24 local param = table.remove(arg, 1):sub(#prefix+1);
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25 if #param == 1 and short_params then
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26 param = short_params[param];
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27 end
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28
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29 if not param then
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30 return nil, "param-not-found", raw_param;
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31 end
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32
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33 local param_k, param_v;
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34 if value_params[param] or array_params[param] then
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35 param_k, param_v = param, table.remove(arg, 1);
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36 if not param_v then
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37 return nil, "missing-value", raw_param;
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38 end
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39 else
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40 param_k, param_v = param:match("^([^=]+)=(.+)$");
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41 if not param_k then
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42 if param:match("^no%-") then
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43 param_k, param_v = param:sub(4), false;
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44 else
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45 param_k, param_v = param, true;
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46 end
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47 end
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48 param_k = param_k:gsub("%-", "_");
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49 end
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50 if array_params[param] then
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51 if parsed_opts[param_k] then
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52 table.insert(parsed_opts[param_k], param_v);
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53 else
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54 parsed_opts[param_k] = { param_v };
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55 end
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56 else
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57 parsed_opts[param_k] = param_v;
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58 end
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59 end
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60 for i = 1, #arg do
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61 parsed_opts[i] = arg[i];
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62 end
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63 return parsed_opts;
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64 end
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65
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66 return {
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67 parse = parse;
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68 }