prosody
3af3354366eb
util/human/io.lua

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util/human/io.lua @ 10909:3af3354366eb

util.human.io: Use literal ellipsis instead of \u escape For compat with Lua 5.2 and before
author Kim Alvefur <zash@zash.se>
date Thu, 04 Jun 2020 18:36:47 +0200
parent 10908:18dc4639442e
child 10910:e890b83f08cf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10894
d15a4284fdf8 util.human.io: table: Return title row when no row data passed
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1 local array = require "util.array";
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2
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3 local function getchar(n)
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4 local stty_ret = os.execute("stty raw -echo 2>/dev/null");
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5 local ok, char;
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6 if stty_ret == true or stty_ret == 0 then
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7 ok, char = pcall(io.read, n or 1);
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8 os.execute("stty sane");
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9 else
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10 ok, char = pcall(io.read, "*l");
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11 if ok then
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12 char = char:sub(1, n or 1);
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13 end
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14 end
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15 if ok then
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16 return char;
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17 end
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18 end
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19
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20 local function getline()
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21 local ok, line = pcall(io.read, "*l");
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22 if ok then
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23 return line;
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24 end
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25 end
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26
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27 local function getpass()
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28 local stty_ret, _, status_code = os.execute("stty -echo 2>/dev/null");
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29 if status_code then -- COMPAT w/ Lua 5.1
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30 stty_ret = status_code;
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31 end
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32 if stty_ret ~= 0 then
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33 io.write("\027[08m"); -- ANSI 'hidden' text attribute
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34 end
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35 local ok, pass = pcall(io.read, "*l");
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36 if stty_ret == 0 then
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37 os.execute("stty sane");
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38 else
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39 io.write("\027[00m");
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40 end
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41 io.write("\n");
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42 if ok then
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43 return pass;
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44 end
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45 end
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46
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47 local function show_yesno(prompt)
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48 io.write(prompt, " ");
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49 local choice = getchar():lower();
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50 io.write("\n");
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51 if not choice:match("%a") then
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52 choice = prompt:match("%[.-(%U).-%]$");
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53 if not choice then return nil; end
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54 end
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55 return (choice == "y");
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56 end
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57
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58 local function read_password()
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59 local password;
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60 while true do
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61 io.write("Enter new password: ");
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62 password = getpass();
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63 if not password then
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64 print("No password - cancelled");
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65 return;
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66 end
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67 io.write("Retype new password: ");
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68 if getpass() ~= password then
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69 if not show_yesno [=[Passwords did not match, try again? [Y/n]]=] then
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70 return;
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71 end
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72 else
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73 break;
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74 end
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75 end
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76 return password;
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77 end
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78
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79 local function show_prompt(prompt)
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80 io.write(prompt, " ");
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81 local line = getline();
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82 line = line and line:gsub("\n$","");
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83 return (line and #line > 0) and line or nil;
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84 end
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85
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86 local function printf(fmt, ...)
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87 print(fmt:format(...));
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88 end
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89
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90 local function padright(s, width)
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91 return s..string.rep(" ", width-#s);
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92 end
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93
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94 local function padleft(s, width)
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95 return string.rep(" ", width-#s)..s;
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96 end
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97
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98 local function new_table(col_specs, max_width)
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99 max_width = max_width or tonumber(os.getenv("COLUMNS")) or 80;
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100 local separator = " | ";
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101
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102 local widths = {};
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103 local total_width = max_width - #separator * (#col_specs-1);
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104 local free_width = total_width;
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105 -- Calculate width of fixed-size columns
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106 for i = 1, #col_specs do
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107 local width = col_specs[i].width or "0";
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108 if not(type(width) == "string" and width:sub(-1) == "%") then
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109 local title = col_specs[i].title;
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110 width = math.max(tonumber(width), title and (#title+1) or 0);
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111 widths[i] = width;
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112 free_width = free_width - width;
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113 end
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114 end
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115 -- Calculate width of %-based columns
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116 for i = 1, #col_specs do
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117 if not widths[i] then
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118 local pc_width = tonumber((col_specs[i].width:gsub("%%$", "")));
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119 widths[i] = math.floor(free_width*(pc_width/100));
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120 end
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121 end
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122
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123 return function (row)
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124 local titles;
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125 if not row then
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126 titles, row = true, array.pluck(col_specs, "title", "");
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127 end
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128 local output = {};
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129 for i, column in ipairs(col_specs) do
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130 local width = widths[i];
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131 local v = tostring(row[not titles and column.key or i] or "");
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132 if #v < width then
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133 if column.align == "right" then
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134 v = padleft(v, width-1).." ";
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135 else
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136 v = padright(v, width);
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137 end
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138 elseif #v > width then
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139 v = v:sub(1, width-1) .. "…";
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140 end
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141 table.insert(output, v);
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142 end
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6af28c756752 util.human.io: Draw a separator between columns
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143 return table.concat(output, separator);
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144 end;
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145 end
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146
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147 return {
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148 getchar = getchar;
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149 getline = getline;
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150 getpass = getpass;
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151 show_yesno = show_yesno;
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152 read_password = read_password;
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153 show_prompt = show_prompt;
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154 printf = printf;
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155 padleft = padleft;
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156 padright = padright;
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157 table = new_table;
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158 };