Tools for those working heavily with strings

Tools for those working heavily with strings

[carlmarcos--- via Users list for the GNU Emacs text editor]

If one works heavily with strings, it is often strongly recommend to use Magnar Sveen `s.el' string manipulation library.

Can emacs have its own string manipulation tools.  It would be much appreciated.

Re: Tools for those working heavily with strings

[Jean Louis]

* carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2022-07-24 08:06]:
> If one works heavily with strings, it is often strongly recommend to use Magnar Sveen `s.el' string manipulation library.
> 
> Can emacs have its own string manipulation tools.  It would be much
> appreciated.

74 possible completions for functions with prefix `string-':

string-add string-add-space string-as-multibyte string-as-unibyte
string-blank-if-nil string-blank-p string-bytes string-chop-newline
string-clean-whitespace string-collate-equalp string-collate-lessp
string-comma-space string-comma-space-cast-text
string-comma-space-list string-comma-space-quoted
string-comma-space-quoted-list string-cut-id string-cut-id-with-part
string-cut-right-square-bracket-reference string-distance string-edit
string-empty-p string-equal string-fill string-glyph-compose
string-glyph-decompose string-glyph-split string-greaterp
string-insert-rectangle string-is-number-p
string-is-positive-integer-p string-join string-last-part-after-space
string-lessp string-limit string-lines string-make-multibyte
string-make-unibyte string-match string-match-p
string-number-smaller-p string-or-empty-string string-or-null-p
string-pad string-pixel-width string-prefix-p string-rectangle
string-remove-prefix string-remove-suffix string-replace
string-replace-non-digits-for-spaces string-replace-shorten-spaces
string-reverse string-search string-slug string-slug-region
string-suffix-p string-to-char string-to-double-quotes
string-to-file-force string-to-list string-to-multibyte
string-to-number string-to-single-quotes string-to-syntax
string-to-unibyte string-to-vector string-trim string-trim-left
string-trim-right string-truncate-left string-version-lessp
string-width string-words-to-double-quotes

-- 
Jean

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Re: Tools for those working heavily with strings

[carlmarcos--- via Users list for the GNU Emacs text editor]

Jul 24, 2022, 05:11 by bugs@gnu.support:

> * carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2022-07-24 08:06]:
>
>> If one works heavily with strings, it is often strongly recommend to use Magnar Sveen `s.el' string manipulation library.
>>
>> Can emacs have its own string manipulation tools.  It would be much
>> appreciated.
>>
>
> 74 possible completions for functions with prefix `string-':
>
Why the popular recommendation for `s.el` then?


> string-add string-add-space string-as-multibyte string-as-unibyte
> string-blank-if-nil string-blank-p string-bytes string-chop-newline
> string-clean-whitespace string-collate-equalp string-collate-lessp
> string-comma-space string-comma-space-cast-text
> string-comma-space-list string-comma-space-quoted
> string-comma-space-quoted-list string-cut-id string-cut-id-with-part
> string-cut-right-square-bracket-reference string-distance string-edit
> string-empty-p string-equal string-fill string-glyph-compose
> string-glyph-decompose string-glyph-split string-greaterp
> string-insert-rectangle string-is-number-p
> string-is-positive-integer-p string-join string-last-part-after-space
> string-lessp string-limit string-lines string-make-multibyte
> string-make-unibyte string-match string-match-p
> string-number-smaller-p string-or-empty-string string-or-null-p
> string-pad string-pixel-width string-prefix-p string-rectangle
> string-remove-prefix string-remove-suffix string-replace
> string-replace-non-digits-for-spaces string-replace-shorten-spaces
> string-reverse string-search string-slug string-slug-region
> string-suffix-p string-to-char string-to-double-quotes
> string-to-file-force string-to-list string-to-multibyte
> string-to-number string-to-single-quotes string-to-syntax
> string-to-unibyte string-to-vector string-trim string-trim-left
> string-trim-right string-truncate-left string-version-lessp
> string-width string-words-to-double-quotes
>
> -- 
> Jean
>
> Take action in Free Software Foundation campaigns:
> https://www.fsf.org/campaigns
>
> In support of Richard M. Stallman
> https://stallmansupport.org/
>

Re: Tools for those working heavily with strings

[Jean Louis]

But look, you don't take a library because of library, but you take it easy it is practically useful for your purpose.


Jean

Re: Tools for those working heavily with strings

[Jean Louis]

Sorry, many of those functions were not from Emacs, but mine.

However, I manipulate strings and I don't reneger ever using s.el

Jean

Re: Tools for those working heavily with strings

[carlmarcos--- via Users list for the GNU Emacs text editor]

Jul 24, 2022, 08:44 by bugs@gnu.support:

> Sorry, many of those functions were not from Emacs, but mine.
>
> However, I manipulate strings and I don't reneger ever using s.el
>
> Jean
>
I'd appreciate if emacs could provide a minimum set of functions to manipulate list,
as string manipulations are of good use.

What can be introduced, you think?

Re: Tools for those working heavily with strings

[tomas]

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On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users list for the GNU Emacs text editor wrote:

[...]

> I'd appreciate if emacs could provide a minimum set of functions to manipulate list,
> as string manipulations are of good use.

Why do you always refuse to read the docs?

> What can be introduced, you think?

What is missing, from your point of view?

cheers
-- 
t

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Re: Tools for those working heavily with strings

[carlmarcos--- via Users list for the GNU Emacs text editor]

Jul 24, 2022, 11:26 by tomas@tuxteam.de:

> On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users list for the GNU Emacs text editor wrote:
>
> [...]
>
>> I'd appreciate if emacs could provide a minimum set of functions to manipulate list,
>> as string manipulations are of good use.
>>
>
> Why do you always refuse to read the docs?
>
>> What can be introduced, you think?
>>
>
> What is missing, from your point of view?
>
What can I use to test whether a string in composed of whitespace or is empty?



> cheers
> -- 
> t
>

Re: Tools for those working heavily with strings

[Arash Esbati]

carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:

> What can I use to test whether a string in composed of whitespace or
> is empty?

I'm not sure if I understand the "composed of whitespace" part
correctly, but you can try:

(let ((s "With space"))
  (and (string-match " " s)
       (message "With space")))

(let ((s "    "))
  (and (string-match "\\`[[:space:]]*\\'" s)
       (message "Only spaces")))

(let ((s ""))
  (and (string= s "")
       (message "Empty string")))

(let ((s ""))
  (and (= (length s) 0)
       (message "Empty string")))

Best, Arash

Re: Tools for those working heavily with strings

[tomas]

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On Sun, Jul 24, 2022 at 01:42:14PM +0200, carlmarcos@tutanota.com wrote:
> Jul 24, 2022, 11:26 by tomas@tuxteam.de:
> 
> > On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users list for the GNU Emacs text editor wrote:
> >
> > [...]
> >
> >> I'd appreciate if emacs could provide a minimum set of functions to manipulate list,
> >> as string manipulations are of good use.
> >>
> >
> > Why do you always refuse to read the docs?
> >
> >> What can be introduced, you think?
> >>
> >
> > What is missing, from your point of view?
> >
> What can I use to test whether a string in composed of whitespace or is empty?

Try (string-match-p "^[[:space:]]*$" your-string-here)

If you want it to only match "horizontal white space" (i.e. no newlines,
no vertical tabs), try :blank: instead.

Cheers
-- 
t

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Re: Tools for those working heavily with strings

[Philip Kaludercic]

tomas@tuxteam.de writes:

> On Sun, Jul 24, 2022 at 01:42:14PM +0200, carlmarcos@tutanota.com wrote:
>> Jul 24, 2022, 11:26 by tomas@tuxteam.de:
>> 
>> > On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users
>> > list for the GNU Emacs text editor wrote:
>> >
>> > [...]
>> >
>> >> I'd appreciate if emacs could provide a minimum set of functions
>> >> to manipulate list,
>> >> as string manipulations are of good use.
>> >>
>> >
>> > Why do you always refuse to read the docs?
>> >
>> >> What can be introduced, you think?
>> >>
>> >
>> > What is missing, from your point of view?
>> >
>> What can I use to test whether a string in composed of whitespace or is empty?
>
> Try (string-match-p "^[[:space:]]*$" your-string-here)

Or `string-empty-p'.

> If you want it to only match "horizontal white space" (i.e. no newlines,
> no vertical tabs), try :blank: instead.
>
> Cheers

Re: Tools for those working heavily with strings

[tomas]

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On Sun, Jul 24, 2022 at 01:20:47PM +0000, Philip Kaludercic wrote:
> tomas@tuxteam.de writes:
> 
> > On Sun, Jul 24, 2022 at 01:42:14PM +0200, carlmarcos@tutanota.com wrote:
> >> Jul 24, 2022, 11:26 by tomas@tuxteam.de:
> >> 
> >> > On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users
> >> > list for the GNU Emacs text editor wrote:
> >> >
> >> > [...]
> >> >
> >> >> I'd appreciate if emacs could provide a minimum set of functions
> >> >> to manipulate list,
> >> >> as string manipulations are of good use.
> >> >>
> >> >
> >> > Why do you always refuse to read the docs?
> >> >
> >> >> What can be introduced, you think?
> >> >>
> >> >
> >> > What is missing, from your point of view?
> >> >
> >> What can I use to test whether a string in composed of whitespace or is empty?
> >
> > Try (string-match-p "^[[:space:]]*$" your-string-here)
> 
> Or `string-empty-p'.

But this is only good for "", not for whitespace, right?

Cheers
-- 

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Re: Tools for those working heavily with strings

[Philip Kaludercic]

tomas@tuxteam.de writes:

> On Sun, Jul 24, 2022 at 01:20:47PM +0000, Philip Kaludercic wrote:
>> tomas@tuxteam.de writes:
>> 
>> > On Sun, Jul 24, 2022 at 01:42:14PM +0200, carlmarcos@tutanota.com wrote:
>> >> Jul 24, 2022, 11:26 by tomas@tuxteam.de:
>> >> 
>> >> > On Sun, Jul 24, 2022 at 01:12:39PM +0200, carlmarcos--- via Users
>> >> > list for the GNU Emacs text editor wrote:
>> >> >
>> >> > [...]
>> >> >
>> >> >> I'd appreciate if emacs could provide a minimum set of functions
>> >> >> to manipulate list,
>> >> >> as string manipulations are of good use.
>> >> >>
>> >> >
>> >> > Why do you always refuse to read the docs?
>> >> >
>> >> >> What can be introduced, you think?
>> >> >>
>> >> >
>> >> > What is missing, from your point of view?
>> >> >
>> >> What can I use to test whether a string in composed of whitespace
>> >> or is empty?
>> >
>> > Try (string-match-p "^[[:space:]]*$" your-string-here)
>> 
>> Or `string-empty-p'.
>
> But this is only good for "", not for whitespace, right?

Yes, my bad I always mix it up with string-blank-p from subr-x.

Re: Tools for those working heavily with strings

[Jean Louis]

* carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2022-07-24 14:43]:
> What can I use to test whether a string in composed of whitespace or is empty?

string-empty-p is a byte-compiled Lisp function in ‘simple.el’.

(string-empty-p STRING)

(string-empty-p "") ⇒ t

But for my understanding string may be considered empty if it has
white space only, thus:

(string-blank-p "         ") ⇒ 0

string-blank-p is a byte-compiled Lisp function in ‘subr-x.el’.

(string-blank-p STRING)

Check whether STRING is either empty or only whitespace.
The following characters count as whitespace here: space, tab, newline and
carriage return.

-- 
Jean

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Re: Tools for those working heavily with strings

[Jean Louis]

* carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2022-07-24 14:13]:
> I'd appreciate if emacs could provide a minimum set of functions to manipulate list,
> as string manipulations are of good use.

It is there.

Do following: {M-x shortdoc-display-group RET list RET} for lists or
{M-x shortdoc-display-group RET string RET} for strings.

The above information within curly brackets are Hyperbole links, you
can activate them with packag Hyperbole by using M-RET

I can see that s.el has functions like `s-trim-left' and such
functions are in Emacs as `string-trim' and `string-trim-left' and so
on.

Function `s-collapse-whitespace' from s.el is in Emacs
`string-clean-whitespace'.

Function `s-split' is `split-string' in Emacs.

Function `s-lines' is `string-lines' in Emacs.

And so on, there are various functions that already exist in Emacs.

Just browse the `list' and `string' groups as above explained.

-- 
Jean

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