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Add hyperlink support #61

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joshtriplett
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Some terminals support hyperlinks to URLs as a text style, defined at
https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda .

Add support for these escape sequences to ansi_term, storing the
hyperlink target as an Option<Rc>. This avoids copying URLs when
modifying styles.

This makes Style no longer Copy, so Style now requires .clone() when
duplicating it.

Note that this intentionally omits support for the id attribute, used
by screen-oriented applications to group separated links together as
"the same link". This arises when splitting links across lines within a
windowing or window-splitting mechanism. Applications with such use
cases will need other screen-oriented escape sequences that ansi_term
doesn't cover, as well.

Some terminals support hyperlinks to URLs as a text style, defined at
https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda .

Add support for these escape sequences to ansi_term, storing the
hyperlink target as an Option<Rc<str>>. This avoids copying URLs when
modifying styles.

This makes Style no longer Copy, so Style now requires .clone() when
duplicating it.

Note that this intentionally omits support for the `id` attribute, used
by screen-oriented applications to group separated links together as
"the same link". This arises when splitting links across lines within a
windowing or window-splitting mechanism. Applications with such use
cases will need other screen-oriented escape sequences that ansi_term
doesn't cover, as well.
@joshtriplett
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The implementation as written uses Option::as_deref, which was stabilized in Rust 1.40. If that's a problem, I can avoid it.

@valpackett
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Other than Copy, another breaking change here is that the Rc makes it non-Sync. (And this is kind of a bad situation… e.g. exa needs it to be Sync, but anyone else who's not using threads might not want the overhead of having an Arc in there)

mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 7, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 7, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 7, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 7, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 7, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 8, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects
(e.g. Starship).

Also, I would argue that these features aren't really
about styling text so much as adding more information for
the terminal emulator to present to the user outside of
the typical area for rendered terminal output.

So this change takes a different approach. An enum
describing the supported OSC codes, which is not exposed
outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.
So Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports and keeps the prefix
and suffix handling neatly adjacent to the Color and Style
prefixes.

--

Sorry if that's a bit verbose. I'm used to carefully
describing even small changes.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 30, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request May 30, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request Jun 1, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request Jun 1, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request Jun 1, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request Jun 2, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
mhelsley pushed a commit to mhelsley/nu-ansi-term that referenced this pull request Jun 2, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.
fdncred pushed a commit to nushell/nu-ansi-term that referenced this pull request Jun 2, 2023
Add support for producing colorized/stylized hyperlinks,
among a selection of other OS Control (OSC) codes such
as setting the window title, application/window icon,
and notifying the terminal about the  current working
directory.

There has already been some discussion and a change proposed
for handling hyperlinks in the dormant rust-ansi-term repo:
(See: ogham#61)
The above proposed change breaks the Copy trait for Style
and would require changing downstream projects that rely on
it.

These features aren't really about styling text so much as
adding more information for the terminal emulator to present
to the user outside of the typical area for rendered terminal
output.

So this change takes a different approach than taken
in the referenced pull request.

An enum describing the supported OSC codes, which is not
exposed outside the crate, is used to indicate that a Style
has additional terminal prefix and suffix output control
codes to take care of for hyperlinks, titles, etc. These
let us keep the prefix/suffix handling consistent.

However rather than library users using these enums
directly or calling externally visible functions on Style
or Color struct, AnsiGenericString uses them to implement
its hyperlink(), title(), etc. functions. These store the
hyperlink "src" string, title, etc. within the
AnsiGenericString rather than in the Style.

Style remains Copy-able, and, since it already stores
strings, AnsiGenericString traits are consistent with this
choice. The locations of the functions better reflect
what's happening because the supplied strings are not meant
to be rendered inline with the ANSI-styled output.

The OSControl enum also nicely describes the subset of OSC
codes the package currently supports.

Co-authored-by: Matt Helsley <matt.helsley+oss@gmail.com>
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