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hb-view --help-all

u01@vm01:~$ hb-view --help-all
Usage:
  hb-view [OPTION...] [FONT-FILE] [TEXT]
Help Options:
  -h, --help                            Show help options
  --help-all                            Show all help options
  --help-font                           Options controlling the font
  --help-text                           Options controlling the input text
  --help-shape                          Options controlling the shaping process
  --help-features                       Options controlling font features used
  --help-output                         Options controlling the destination and form of the output
  --help-view                           Options controlling output rendering
Font options:
  --font-file=filename                  Set font file-name
  --face-index=index                    Set face index (default: 0)
  --font-size=1/2 numbers or 'upem'     Font size (default: 256)
  --font-funcs=impl                     Set font functions implementation to use (default: ft)

    Supported font function implementations are: ft/ot
Text options:
  --text=string                         Set input text
  --text-file=filename                  Set input text file-name

    If no text is provided, standard input is used for input.

  --text-before=string                  Set text context before each line
  --text-after=string                   Set text context after each line
Shape options:
  --list-shapers                        List available shapers and quit
  --shapers=list                        Set comma-separated list of shapers to try
  --direction=ltr/rtl/ttb/btt           Set text direction (default: auto)
  --language=langstr                    Set text language (default: $LANG)
  --script=ISO-15924 tag                Set text script (default: auto)
  --bot                                 Treat text as beginning-of-paragraph
  --eot                                 Treat text as end-of-paragraph
  --preserve-default-ignorables         Preserve Default-Ignorable characters
  --utf8-clusters                       Use UTF8 byte indices, not char indices
  --cluster-level=0/1/2                 Cluster merging level (default: 0)
  --normalize-glyphs                    Rearrange glyph clusters in nominal order
  --num-iterations=N                    Run shaper N times (default: 1)
Features options:
  --features=list                       Comma-separated list of font features

    Features can be enabled or disabled, either globally or limited to
    specific character ranges.  The format for specifying feature settings
    follows.  All valid CSS font-feature-settings values other than 'normal'
    and 'inherited' are also accepted, though, not documented below.

    The range indices refer to the positions between Unicode characters,
    unless the --utf8-clusters is provided, in which case range indices
    refer to UTF-8 byte indices. The position before the first character
    is always 0.

    The format is Python-esque.  Here is how it all works:

      Syntax:       Value:    Start:    End:

    Setting value:
      "kern"        1         0         ∞         # Turn feature on
      "+kern"       1         0         ∞         # Turn feature on
      "-kern"       0         0         ∞         # Turn feature off
      "kern=0"      0         0         ∞         # Turn feature off
      "kern=1"      1         0         ∞         # Turn feature on
      "aalt=2"      2         0         ∞         # Choose 2nd alternate

    Setting index:
      "kern[]"      1         0         ∞         # Turn feature on
      "kern[:]"     1         0         ∞         # Turn feature on
      "kern[5:]"    1         5         ∞         # Turn feature on, partial
      "kern[:5]"    1         0         5         # Turn feature on, partial
      "kern[3:5]"   1         3         5         # Turn feature on, range
      "kern[3]"     1         3         3+1       # Turn feature on, single char

    Mixing it all:

      "aalt[3:5]=2" 2         3         5         # Turn 2nd alternate on for range
Output destination & format options:
  --output-file=filename                Set output file-name (default: stdout)
  --output-format=format                Set output format

    Supported output formats are: ansi/png/svg/pdf/ps/eps
View options:
  --annotate                            Annotate output rendering
  --background=rrggbb/rrggbbaa          Set background color (default: #FFFFFF)
  --foreground=rrggbb/rrggbbaa          Set foreground color (default: #000000)
  --line-space=units                    Set space between lines (default: 0)
  --margin=one to four numbers          Margin around output (default: 16)
Application Options:
  --version                             Show version numbers
  --debug                               Free all resources before exit

u01@vm01:~$