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add ->>as-> function for use with ->> #411

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add ->>as-> function for use with ->> #411

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9424dd8
Add: ->>as-> for use with ->>.
zardoz03 Dec 5, 2023
5461233
test: ->>as->
zardoz03 Dec 5, 2023
daa8d55
README: add ->>as-> to readme
zardoz03 Dec 5, 2023
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12 changes: 12 additions & 0 deletions README.md
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Note that this file is auto-generated from the docstrings in dash.el and the first three examples in dev/examples.el.

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So i'd have to rewrite the tests in order for it to work?
I didn't notice that when I was writing sorry.

Also I forgot to email FSF because other things cropped up -- shall have to ask about anonymous assignments + maybe PO boxes.

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So i'd have to rewrite the tests in order for it to work?

The first three tests in dev/examples.el should be self-contained and representative, then make docs regenerates both README.md and dash.texi accordingly.

If you have any difficulties or would rather avoid running make docs on your end, that's no problem, one of the maintainers or I can do so on the PR branch before merging.

I didn't notice that when I was writing sorry.

No problem at all.

Also I forgot to email FSF because other things cropped up -- shall have to ask about anonymous assignments + maybe PO boxes.

Good luck! Keep us posted.

Expand Up @@ -319,6 +319,7 @@ or readability.
* [`->>`](#--x-optional-form-rest-more) `(x &optional form &rest more)`
* [`-->`](#---x-rest-forms) `(x &rest forms)`
* [`-as->`](#-as--value-variable-rest-forms) `(value variable &rest forms)`
* [`->>as->`](#->>as->variable-rest-forms-value) `(value forms ... value)`
* [`-some->`](#-some--x-optional-form-rest-more) `(x &optional form &rest more)`
* [`-some->>`](#-some--x-optional-form-rest-more) `(x &optional form &rest more)`
* [`-some-->`](#-some---expr-rest-forms) `(expr &rest forms)`
Expand Down Expand Up @@ -2528,6 +2529,17 @@ In the first form, bind `variable` to `value`. In the second form, bind
(-as-> 3 my-var) ;; => 3
```

#### ->>as-> (variable forms ... value)
Ending with VALUE, thread VARIABLE through all the other FORMS.
Variant of `-as->` but intended for use with `->>`.

```el
(->>as-> i (+ i 1) 1) ;; => 2
;; ^ unintuitive on its own.
(->> 1 (->>as-> i (+ i 1))) ;; => 2
(->> "def" (->>as-> string (concat "abc" string "ghi"))) ;; => "abcdefghi"
```

#### -some-> `(x &optional form &rest more)`

When expr is non-`nil`, thread it through the first form (via [`->`](#--x-optional-form-rest-more)),
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13 changes: 13 additions & 0 deletions dash.el
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Expand Up @@ -2127,6 +2127,19 @@ VARIABLE to the result of the first form, and so forth."
,variable
,@(cdr forms)))))

(defmacro ->>as-> (variable &rest forms)
"Ending with VALUE, thread VARIABLE through all the other FORMS.
Variant of `-as->' but intended for use with `->>'.

\(fn VARIABLE FORMS ... VALUE)"
(if (null forms)
(error "No Value nor Forms given!")
(let ((val (car (last forms)))
(args (-butlast forms)))
(if (null args)
`,val
`(-as-> ,val ,variable ,@args)))))

(defmacro -some-> (x &optional form &rest more)
"When expr is non-nil, thread it through the first form (via `->'),
and when that result is non-nil, through the next form, etc."
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8 changes: 8 additions & 0 deletions dev/examples.el
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Expand Up @@ -2064,6 +2064,14 @@ or readability."
(-as-> "def" string (concat "abc" string "ghi") upcase) => "ABCDEFGHI"
(-as-> "def" string (concat "abc" string "ghi") (upcase string)) => "ABCDEFGHI")

(defexamples ->>as->
(->>as-> i 1) => 1
(->>as-> i (+ i 1) 1) => 2
(->> 1 (->>as-> i (+ i 1))) => 2
(->> "def" (->>as-> string (concat "abc" string "ghi"))) => "abcdefghi"
(->> "def" (->>as-> string (concat "abc" string "ghi")) upcase) => "ABCDEFGHI"
(->> "def" (->>as-> string (concat "abc" string "ghi") (upcase string))) => "ABCDEFGHI")

(defexamples -some->
(-some-> '(2 3 5)) => '(2 3 5)
(-some-> 5 square) => 25
Expand Down