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doc (components): update doc to show headers support: fix 451
author Goffi <goffi@goffi.org>
date Sat, 28 Sep 2024 16:00:16 +0200
parents c80a0f864b5d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ================================================
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2 input: automatise commands using external inputs
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3 ================================================
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4
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5 ``input`` is a way to use external data (like file in a specific format) as input
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6 arguments. It may be seen as a something similar to ``--output`` but for inputs.
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7
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8
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9 csv
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10 ===
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11
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12 CSV (for Comma-Separated Values) is a common format for tabular data. It is widely used in
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13 spreadsheet software (at least at en export format). With ``csv`` command, you can use
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14 columns a CSV file as arguments to li commands.
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15
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16 To set the command, you'll write in sequence what to do with each column of your data.
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17 For each column you can:
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18
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19 - specify a short option name using ``-s ARGUMENTS, --short ARGUMENTS`` (short options are
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20 the ones with a single ``-``)
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21 - specify a long option name using ``-l ARGUMENTS, --long ARGUMENTS`` (long options are
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22 the ones with two ``-``)
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23 - specify a positional argument using ``-p ARGUMENTS, --positional ARGUMENTS``
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24 - indicate to use the column data with ``stdin`` using ``-i, --stdin``
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25 - ignore the column if it's not used in the li command, using ``-x, --ignore``
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27 After each column specification, you may use a filter to manage the value. So far the
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28 following filters are available:
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29
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30 ``-S, --split``
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31 This will split the value (on any whitespace character, discarding empty values) and
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32 repeat the option which each item. This is useful when you are using an option which can
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33 be repeated (like ``-t TAG, --tag TAG`` with ``li blog set``).
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34
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35 ``-E ARGUMENTS, --empty ARGUMENTS``
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36 Indicate what to do if the column value is empty (by default en empty string is used).
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37 You can use either ``skip`` to skip the whole row, or ``ignore`` so the option will not
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38 be set at all (which is different from the default which will still set the option but
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39 with an empty string).
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41 CSV file is read from stdin, and by default unicode is expected. You may force an encoding
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42 by using ``--encoding ENCODING``.
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43
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44 By default all the rows are read, but you may want to ignore first rows (if they are used
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45 for columns title, or if you have already handled part of the list). To do that, use the
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46 ``-r ROW, --row ROW`` option.
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47
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48 When you test your command, it is better to do a dry run to see what will happen. The
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49 ``-D, --debug`` option is here for that: if you set it, the commands won't be actually
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50 run, but the exact command which would be executed will be printed on screen. You should
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51 always use this option first until you're sure that what you want will be executed.
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52
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53 You may add verbosity level to help debugging. With a verbosity level of 2 (i.e. ``-vv``)
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54 the value read from CSV will be printed.
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55
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56 By default stdout and stderr of each launched command is ignored, but you can log them to
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57 files using respectively ``--log LOG`` and ``--log-err LOG_ERR`` where ``LOG`` and
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58 ``LOG_ERR`` are paths to a log file to create.
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59
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60 Once all the sequence and options are set, you write the li command that you want to use,
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61 with all the needed static option (i.e. options which must be used each time).
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62
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63
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64 example
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65 -------
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66
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67 Louise as a spreadsheet with a table like this:
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68
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69 ============================ ============ ============= ===============
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70 title body internal data tags
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71 ============================ ============ ============= ===============
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72 Some title a body ABC li demo
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73 Something else another body XYZ li demo
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74 Third one third body VWZ special_tag li
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75 This one doesn't have a body 123 li demo numbers
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76 last one last body 456 li demo numbers
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77 ============================ ============ ============= ===============
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78
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79 She wants to use it as input data to create blog posts.
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80
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81 She first saves the file using CSV format, let's say to ``~/blog_input.csv``.
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82
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83 Then she checks ``li blog set --help`` to get name of options to use. She'll need to use
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84 ``--title`` for title, ``stdin`` for the body and ``-t`` for tags. Louise wants to
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85 activate comments, so she also wants to use ``-C`` for all posts, and a tag to says it's
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86 coming from the spreadsheet (using ``-t spreadsheet``) .
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87
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88 The first row of the table is used for columns headers, so she'll start at row 1 with ``-r
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89 1``.
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90
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91 There is one row without body, Louise want to skip any row without body so she'll use the
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92 ``-E skip`` filter, just after specifying the body row.
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93
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94 Reading column by column, the sequence is like this:
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95
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96 ``-l title``
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97 a title which goes to the ``--title`` long option of ``li blog``
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98 ``-i -E skip``
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99 a body which goes to the stdin of ``li blog``. If the body is empty, the ``-E skip``
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100 filter tells to skip the whole row.
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101 ``-x``
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102 the ``internal data`` column is not used, so it is ignored
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103 ``-s t -S``
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104 the last column are the tags, so the ``-t`` short option is used. There are several of
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105 them separated by spaces, so the ``-S`` filter is used to split the values.
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106
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107 First she'll use the ``-D, --debug`` to check that the commands which will be executed are
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108 the expected one::
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109
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110 $ li input csv -D -r 1 -l title -i -E skip -x -s t -S blog set -C -t spreadsheet < ~/blog_input.csv
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111
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112 Everything seems fine, so she'll actually launch the command by running the same command
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113 line but without the ``-D`` option::
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114
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115 $ li input csv -r 1 -l title -i -E skip -x -s t -S blog set -C -t spreadsheet < ~/blog_input.csv
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116
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117 She could also have used ``--log`` and ``--log-err`` to check the logs of each command::
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118
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119 $ li input csv -r 1 -l title -i -E skip -x -s t -S --log /tmp/jp_blog_stdout.log --log-err /tmp/jp_blog_stderr.log blog set -C -t spreadsheet < ~/blog_input.csv