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;doc:journal: move complex discussion of commodity styles later

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@ -664,9 +664,8 @@ This option can repeated to set the display style for multiple
commodities/currencies. Its argument is as described in
the [commodity directive](#commodity-directive).
hledger will occasionally make some additional adjustments to number formatting,
eg adding a trailing decimal mark to disambiguate numbers with digit group marks;
for details, see [Amount formatting, parseability](#amount-formatting-parseability).
In some cases hledger will adjust number formatting to improve their parseability
(such as adding [trailing decimal marks](#trailing-decimal-marks) when needed).
## Colour
@ -1228,7 +1227,7 @@ Or you can declare it per commodity with [`commodity`](#commodity-directive) dir
hledger also accepts numbers like `10.` with no digits after the decimal mark
(and will sometimes display numbers that way to disambiguate them - see
[Amount formatting, parseability](#amount-formatting-parseability)).
[Trailing decimal marks](#trailing-decimal-marks)).
### Digit group marks
@ -1275,58 +1274,8 @@ output; you can't write them directly in the journal file.
<!-- (Though an omitted balancing amount can be multi-commodity.) -->
<!-- (If you are writing scripts or working with hledger's internals, this is the `MixedAmount` type.) -->
<a name="amount-display-style"></a>
### Commodity display style
For the amounts in each commodity, hledger chooses a consistent display style
(symbol placement, decimal mark and digit group marks, number of decimal digits)
to use in most reports. This is inferred as follows:
First, if there's a [`D` directive](#d-directive) declaring a default commodity,
that commodity symbol and amount format is applied to all no-symbol amounts in the journal.
Then each commodity's display style is determined from its
[`commodity` directive](#commodity-directive). We recommend always
declaring commodities with `commodity` directives, since they help
ensure consistent display styles and precisions, and bring other
benefits such as error checking for commodity symbols.
Here's an example:
```journal
# Set display styles (and decimal marks, for parsing, if there is no decimal-mark directive)
# for the $, EUR, INR and no-symbol commodities:
commodity $1,000.00
commodity EUR 1.000,00
commodity INR 9,99,99,999.00
commodity 1 000 000.9455
```
But for convenience, if a `commodity` directive is not present,
hledger infers a commodity's display styles from its amounts as they are written in the journal
(excluding cost amounts and amounts in periodic transaction rules or auto posting rules).
It uses
- the symbol placement and decimal mark of the first amount seen
- the digit group marks of the first amount with digit group marks
- and the maximum number of decimal digits seen across all amounts.
And as fallback if no applicable amounts are found, it would use a
default style, like `$1000.00` (symbol on the left with no space,
period as decimal mark, and two decimal digits).
Finally, commodity styles can be [overridden](#commodity-styles) by
the `-c/--commodity-style` command line option.
### Rounding
Amounts are stored internally as decimal numbers with up to 255 decimal places.
They are displayed
with their original journal precisions by print and print-like reports,
and rounded to their display precision (the number of decimal digits specified by the commodity display style)
by other reports.
When rounding, hledger uses [banker's rounding](https://en.wikipedia.org/wiki/Bankers_rounding)
(it rounds to the nearest even digit). So eg 0.5 displayed with zero decimal digits appears as "0".
By default, the format of amounts in the journal influences how hledger displays them in output.
This is explained in [Commodity display style](#commodity-display-style) below.
<a name="transaction-prices"></a>
@ -4521,14 +4470,68 @@ per:admin ....
# PART 3: REPORTING CONCEPTS
# Amount formatting
# Amount formatting, parseability
<a name="amount-display-style"></a>
## Commodity display style
For the amounts in each commodity, hledger chooses a consistent display style
(symbol placement, decimal mark and digit group marks, number of decimal digits)
to use in most reports. This is inferred as follows:
First, if there's a [`D` directive](#d-directive) declaring a default commodity,
that commodity symbol and amount format is applied to all no-symbol amounts in the journal.
Then each commodity's display style is determined from its
[`commodity` directive](#commodity-directive). We recommend always
declaring commodities with `commodity` directives, since they help
ensure consistent display styles and precisions, and bring other
benefits such as error checking for commodity symbols.
Here's an example:
```journal
# Set display styles (and decimal marks, for parsing, if there is no decimal-mark directive)
# for the $, EUR, INR and no-symbol commodities:
commodity $1,000.00
commodity EUR 1.000,00
commodity INR 9,99,99,999.00
commodity 1 000 000.9455
```
But for convenience, if a `commodity` directive is not present,
hledger infers a commodity's display styles from its amounts as they are written in the journal
(excluding cost amounts and amounts in periodic transaction rules or auto posting rules).
It uses
- the symbol placement and decimal mark of the first amount seen
- the digit group marks of the first amount with digit group marks
- and the maximum number of decimal digits seen across all amounts.
And as fallback if no applicable amounts are found, it would use a
default style, like `$1000.00` (symbol on the left with no space,
period as decimal mark, and two decimal digits).
Finally, commodity styles can be [overridden](#commodity-styles) by
the `-c/--commodity-style` command line option.
## Rounding
Amounts are stored internally as decimal numbers with up to 255 decimal places.
They are displayed
with their original journal precisions by print and print-like reports,
and rounded to their display precision (the number of decimal digits specified by the commodity display style)
by other reports.
When rounding, hledger uses [banker's rounding](https://en.wikipedia.org/wiki/Bankers_rounding)
(it rounds to the nearest even digit). So eg 0.5 displayed with zero decimal digits appears as "0".
## Trailing decimal marks
If you're wondering why your [`print`](#print) report sometimes shows
trailing decimal marks, with no decimal digits; it does this when
showing amounts that have digit group marks but no decimal digits,
to disambiguate them and allow them to be re-parsed reliably
(see also [Decimal marks](#decimal-marks).
(see [Decimal marks](#decimal-marks)).
Eg:
```journal
@ -4565,7 +4568,9 @@ $ hledger print -c '$1,000.00' --round=soft
```
More generally: hledger output falls into three rough categories, which
## Amount parseability
More generally, hledger output falls into three rough categories, which
format amounts a little bit differently to suit different consumers:
**1. "hledger-readable output" - should be readable by hledger (and by humans)**