Add docs from nexB/aboutcode

Migrate all scancode-toolkit documentation from aboutcode till this commit -
aboutcode-org/aboutcode@faea9fc
Last pull request adding scancode docs was aboutcode-org/aboutcode#33

Signed-off-by: Ayan Sinha Mahapatra <[email protected]>

Author: AyanSinhaMahapatra

docs/source/cli-reference/basic-options.rst

@@ -0,0 +1,239 @@
+`Basic` Options
+===============
+
+.. include::  /scancode-toolkit/rst_snippets/basic_options.rst
+
+----
+
+.. include::  /scancode-toolkit/rst_snippets/note_snippets/synopsis_install_quickstart.rst
+
+----
+
+``--generated`` Options
+-----------------------
+
+    The ``--generated`` option classifies automatically generated code files with a flag.
+
+    An example of using ``--generated`` in a scan::
+
+        scancode -clpieu --json-pp output.json samples --generated
+
+    In the results, for each file the following attribute is added with it's corresponding
+    ``true``/``false`` value ::
+
+        "is_generated": true
+
+    In the samples folder, the following files have a true value for their is_generated attribute::
+
+        "samples/zlib/dotzlib/LICENSE_1_0.txt"
+        "samples/JGroups/licenses/apache-2.0.txt"
+
+    ..
+        [ToDo] Research and Write Better
+
+----
+
+``--max-email`` Options
+-----------------------
+
+    .. admonition:: Dependency
+
+        The option ``--max-email`` is a sub-option of and requires the option ``--email``.
+
+    If in the files that are scanned, in individual files, there are a lot of emails (i.e lists) which
+    are unnecessary and clutter the scan results, ``--max-email`` option can be used to report emails
+    only up to a limit in individual files.
+
+    Some important INTEGER values of the ``--max-email INTEGER`` option:
+
+    - 0  - No limit, include all emails.
+    - 50 - Default.
+
+    An example usage::
+
+        scancode -clpieu --json-pp output.json samples --max-email 5
+
+    This only reports 5 email addresses per file and ignores the rest.
+
+----
+
+``--max-url`` Options
+---------------------
+
+    .. admonition:: Dependency
+
+        The option ``--max-url`` is a sub-option of and requires the option ``--url``.
+
+    If in the files that are scanned, in individual files, there are a lot of links to other websites
+    (i.e url lists) which are unnecessary and clutter the scan results, ``--max-url`` option can be
+    used to report urls only up to a limit in individual files.
+
+    Some important INTEGER values of the ``--max-url INTEGER`` option:
+
+    - 0  - No limit, include all urls.
+    - 50 - Default.
+
+    An example usage::
+
+        scancode -clpieu --json-pp output.json samples --max-url 10
+
+    This only reports 10 urls per file and ignores the rest.
+
+----
+
+``--license-score`` Options
+---------------------------
+
+    .. admonition:: Dependency
+
+        The option ``--license-score`` is a sub-option of and requires the option ``--license``.
+
+    ..
+        [ToDo] Research and Write License Matching Better
+
+    License matching strictness, i.e. How closely matched licenses are detected in a scan, can be
+    modified by using this ``--license-score`` option.
+
+    Some important INTEGER values of the ``--license-score INTEGER`` option:
+
+    - **0**     - Default and Lowest Value, All matches are reported.
+    - **100**    - Highest Value, Only licenses with a much better match are reported
+
+    Here, a bigger number means a better match, i.e. Setting a higher license score translates to a
+    higher threshold for matching licenses (with equal or less number of license matches).
+
+    An example usage::
+
+        scancode -clpieu --json-pp output.json samples --license-score 70
+
+    Here's the license results on setting the integer value to 100, Vs. the default value 0. This is
+    visualized using ScanCode workbench in the License Info Dashboard.
+
+    .. list-table:: License scan results of Samples Directory.
+
+        * - .. figure:: data/core_lic_score_0.png
+
+               License Score 0 (Default).
+
+          - .. figure:: data/core_lic_score_100.png
+
+               License Score 100.
+
+----
+
+``--license-text`` Options
+--------------------------
+
+    .. admonition:: Dependency
+
+        The option ``--license-text`` is a sub-option of and requires the option ``--license``.
+
+    .. admonition:: Sub-Option
+
+        The option ``--license-text-diagnostics`` and ``--is-license-text`` are sub-options of
+        ``--license-text``. ``--is-license-text`` is a Post-Scan Option.
+
+    With the ``--license-text`` option, the scan results attribute "matched text" includes the matched text
+    for the detected license.
+
+    An example Scan::
+
+        scancode -cplieu --json-pp output.json samples --license-text
+
+    An example matched text included in the results is as follows::
+
+        "matched_text":
+         "  This software is provided 'as-is', without any express or implied
+         warranty.  In no event will the authors be held liable for any damages
+         arising from the use of this software.
+         Permission is granted to anyone to use this software for any purpose,
+         including commercial applications, and to alter it and redistribute it
+         freely, subject to the following restrictions:
+         1. The origin of this software must not be misrepresented; you must not
+         claim that you wrote the original software. If you use this software
+         in a product, an acknowledgment in the product documentation would be
+         appreciated but is not required.
+         2. Altered source versions must be plainly marked as such, and must not be
+         misrepresented as being the original software.
+         3. This notice may not be removed or altered from any source distribution.
+
+         Jean-loup Gailly        Mark Adler
+         [email protected]          [email protected]"
+
+    - The file in which this license was detected: ``samples/arch/zlib.tar.gz-extract/zlib-1.2.8/zlib.h``
+    - License name: "ZLIB License"
+
+----
+
+``--license-url-template`` Options
+----------------------------------
+
+    .. admonition:: Dependency
+
+        The option ``--license-url-template`` is a sub-option of and requires the option
+        ``--license``.
+
+    The ``--license-url-template`` option sets the template URL used for the license reference URLs.
+
+    The default template URL is : [https://enterprise.dejacode.com/urn/urn:dje:license:{}]
+    In a template URL, curly braces ({}) are replaced by the license key.
+
+    So, by default the license reference URL points to the dejacode page for that license.
+
+    A scan example using the ``--license-url-template TEXT`` option ::
+
+        scancode -clpieu --json-pp output.json samples --license-url-template https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/licenses/{}.yml
+
+    In a normal scan, reference url for "ZLIB License" is as follows::
+
+        "reference_url": "https://enterprise.dejacode.com/urn/urn:dje:license:zlib",
+
+    After using the option in the following manner::
+
+        ``--license-url-template https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/licenses/{}``
+
+    the reference URL changes to this `zlib.yml file <https://github.com/nexB/scancode-toolkit/blob/develop/src/licensedcode/data/licenses/zlib.yml>`_::
+
+        "reference_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/licenses/zlib.yml",
+
+    The reference URL changes for all detected licenses in the scan, across the scan result file.
+
+----
+
+``--license-text-diagnostics`` Options
+--------------------------------------
+
+    .. admonition:: Dependency
+
+        The option ``--license-text-diagnostics`` is a sub-option of and requires the options
+        ``--license`` and ``--license-text``.
+
+    In the matched license text, include diagnostic highlights surrounding with square brackets []
+    words that are not matched.
+
+    In a normal scan, whole lines of text are included in the matched license text, including parts
+    that are possibly unmatched.
+
+    An example Scan::
+
+        scancode -cplieu --json-pp output.json samples --license-text --license-text-diagnostics
+
+    Running a scan on the samples directory with ``--license-text --license-text-diagnostics`` options,
+    causes the following difference in the scan result of the file
+    ``samples/JGroups/licenses/bouncycastle.txt``.
+
+    Without Diagnostics::
+
+        "matched_text":
+        "License Copyright (c) 2000 - 2006 The Legion Of The Bouncy Castle
+        (http://www.bouncycastle.org) Permission is hereby granted, free of charge, to any person
+        obtaining a copy of this software and associated documentation files (the \"Software\"),
+        to deal in the Software without restriction
+
+    With Diagnostics on::
+
+        "matched_text":
+        "License [Copyright] ([c]) [2000] - [2006] [The] [Legion] [Of] [The] [Bouncy] [Castle]
+        ([http]://[www].[bouncycastle].[org]) Permission is hereby granted, free of charge, to any person
+        obtaining a copy of this software and associated documentation files (the \"Software\"),
+        to deal in the Software without restriction,

docs/source/cli-reference/core-options.rst

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+`Core` Options
+==============
+
+.. _cli_core:
+
+.. include::  /scancode-toolkit/rst_snippets/core_options.rst
+
+----
+
+.. include::  /scancode-toolkit/rst_snippets/note_snippets/synopsis_install_quickstart.rst
+
+----
+
+Comparing Progress Message Options
+----------------------------------
+
+    **Default Progress Message**::
+
+        Scanning files for: infos, licenses, copyrights, packages, emails, urls with 1 process(es)...
+        Building license detection index...Done.
+        Scanning files...
+        [####################] 43
+        Scanning done.
+        Scan statistics: 43 files scanned in 33s.
+        Scan options:    infos, licenses, copyrights, packages, emails, urls with 1 process(es).
+        Scanning speed:  1.4 files per sec.
+        Scanning time:   30s.
+        Indexing time:   2s.
+        Saving results.
+
+    **Progress Message with ``--verbose``**::
+
+        Scanning files for: infos, licenses, copyrights, packages, emails, urls with 1 process(es)...
+        Building license detection index...Done.
+        Scanning files...
+        Scanned: screenshot.png
+        Scanned: README
+        ...
+        Scanned: zlib/dotzlib/ChecksumImpl.cs
+        Scanned: zlib/dotzlib/readme.txt
+        Scanned: zlib/gcc_gvmat64/gvmat64.S
+        Scanned: zlib/ada/zlib.ads
+        Scanned: zlib/infback9/infback9.c
+        Scanned: zlib/infback9/infback9.h
+        Scanned: arch/zlib.tar.gz
+        Scanning done.
+        Scan statistics: 43 files scanned in 29s.
+        Scan options:    infos, licenses, copyrights, packages, emails, urls with 1 process(es).
+        Scanning speed:  1.58 files per sec.
+        Scanning time:   27s.
+        Indexing time:   2s.
+        Saving results.
+
+    So, with ``--verbose`` enables, progress messages for individual files are shown.
+
+    **With the ``--quiet`` option enabled**, nothing is printed on the Command Line.
+
+----
+
+``--timeout`` Option
+--------------------
+
+    This option sets scan timeout for **each file** (and not the entire scan). If some file scan
+    exceeds the specified timeout, that file isn't scanned anymore and the next file scanning
+    starts. This helps avoiding very large/long files, and saves time.
+
+    Also the number (timeout in seconds) to be followed by this option can be a
+    floating point number, i.e. 1.5467.
+
+----
+
+``--reindex-licenses`` Option
+-----------------------------
+
+    ScanCode maintains a license index to search for and detect licenses. When Scancode is
+    configured for the first time, a license index is built and used in every scan thereafter.
+
+    This ``--reindex-licenses`` option rebuilds the license index. Running a scan with this option
+    displays the following message to the terminal in addition to what it normally shows::
+
+        Checking and rebuilding the license index...
+
+    ..
+        [ToDo] Research and Write Better
+
+----
+
+``--from-json`` Option
+----------------------
+
+    If you want to input scan results from a .json file, and run a scan again on those same files,
+    with some other options/output format, you can do so using the ``--from-json`` option.
+
+    An example scan command using ``--from-json``::
+
+        scancode --from-json sample.json --json-pp sample_2.json --classify
+
+    This inputs the scan results from ``sample.json``, runs the post-scan plugin ``--classify`` and
+    outputs the results for this scan to ``sample_2.json``.
+
+----
+
+``--max-in-memory`` Option
+----------------------------------
+
+    During a scan, as individual files are scanned, the scan details for those files are kept on
+    memory till the scan is completed. Then after the scan is completed, they are written in the
+    specified output format.
+
+    Now, if the scan involves a very large number of files, they might not fit in the memory during
+    the scan. For this reason, disk-caching can be used for some/all of the files.
+
+    Some important INTEGER values of the ``--max-in-memory INTEGER`` option:
+
+    - **0**     - Unlimited Memory, store all the file/directory scan results on memory
+    - **-1**    - Use only Disk-Caching, store all the file/directory scan results on disk
+    - **10000** - Default, store 10,000 file/directory scan results on memory and the rest on disk
+
+    An example usage::
+
+        scancode -clieu --json-pp sample.json samples --max-in-memory -1