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doc: try to clarify multi-weekday syntax more (#1632)

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Simon Michael 2021-08-20 17:02:34 -10:00
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hledger/hledger.m4.md
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@ -698,26 +698,6 @@ Examples:
| `-p "every 5th November"` | same |
| `-p "every Nov 5th"` | same |
Intervals beginning on multiple days of the week can be specified by combining
`WEEKDAYNAME`s with commas. For example, an expression that starts a new period
on every standard weekday would be `mon,tue,wed,thu,fri`. For convenience, the
special period expressions `weekday` and `weekendday` are effectively
`mon|tue|wed|thu|fri` and `sat|sun` respectively.
Note that this will generate adjacent but uneven periods so the periods may not
be as directly comparable. This is probably most useful as a periodic
transaction (#periodic-transactions).
Examples:
| | |
|------------------------------|-------------------------------------------------------------|
| `-p "every mon,fri"` | periods will be `[Mon, Fri), [Fri, Mon)...` |
| `-p "every mon,wed,fri"` | periods will be `[Mon, Wed), [Wed, Fri), [Fri, Mon)...` |
| `-p "every weekday"` | periods will be `[Mon], [Tue], [Wed], [Thu], [Fri, Mon)...` |
| `-p "every weekendday"` | periods will be `[Sat], [Sun, Sat)...` |
Show historical balances at end of the 15th day of each month (N is an end date, exclusive as always):
```shell
@ -730,6 +710,39 @@ Group postings from the start of wednesday to end of the following tuesday (N is
$ hledger register checking -p "every 3rd day of week"
```
### Periods or dates ?
Report intervals like the above are most often used with `-p|--period`,
to divide reports into multiple subperiods -
each generated date marks a subperiod boundary.
Here, the periods between the dates are what's important.
But report intervals can also be used
with `--forecast` to generate future transactions,
or with `balance --budget` to generate budget goal-setting transactions.
For these, the dates themselves are what matters.
### Events on multiple weekdays
The `every WEEKDAYNAME` form has a special variant with multiple day names, comma-separated.
Eg: `every mon,thu,sat`.
Also, `weekday` and `weekendday` are shorthand for `mon,tue,wed,thu,fri` and `sat,sun`
respectively.
This form is mainly intended for use with `--forecast`, to generate
[periodic transactions](#periodic-transactions) on arbitrary days of the week.
It may be less useful with `-p`, since it divides each week into subperiods
of unequal length. (Because gaps between periods are not allowed;
if you'd like to change this, see [#1632](https://github.com/simonmichael/hledger/pull/1632).)
Examples:
| | |
|------------------------------|----------------------------------------------------------------------------------------|
| `-p "every mon,wed,fri"` | dates will be Mon, Wed, Fri; <br>periods will be Mon-Tue, Wed-Thu, Fri-Sun |
| `-p "every weekday"` | dates will be Mon, Tue, Wed, Thu, Fri; <br>periods will be Mon, Tue, Wed, Thu, Fri-Sun |
| `-p "every weekendday"` | dates will be Sat, Sun; <br>periods will be Sat, Sun-Fri |
# DEPTH
With the `--depth NUM` option (short form: `-NUM`),