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65
docs/sequences.md
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# Control and Escape Sequences
⚠️ **This is super out of date. Ghostty's support is much better
⚠️ **This is super out of date. Ghostty's support is much better
than this document seems. TODO to update this.** ⚠️
This is the list of control and escape sequences known in the ecosystem
of terminal emulators and their implementation status in ghostty. Note that
some control sequences may never be implemented in ghostty. In these scenarios,
@@ -11,35 +10,35 @@ it is noted why.
Status meanings:
* ✅ - Implementation is complete and considered 100% accurate.
* ⚠️ - Implementation works, but may be missing some functionality. The
details of how well it works or doesn't are in the linked page. In many
cases, the missing functionality is very specific or esoteric. Regardless,
we don't consider a sequence a green checkmark until all known feature
interactions are complete.
* ❌ - Implementation is effectively non-functional, but ghostty continues
in the face of it (probably in some broken state).
* 💥 - Ghostty crashes if this control sequence is sent.
- ✅ - Implementation is complete and considered 100% accurate.
- ⚠️ - Implementation works, but may be missing some functionality. The
details of how well it works or doesn't are in the linked page. In many
cases, the missing functionality is very specific or esoteric. Regardless,
we don't consider a sequence a green checkmark until all known feature
interactions are complete.
- ❌ - Implementation is effectively non-functional, but ghostty continues
in the face of it (probably in some broken state).
- 💥 - Ghostty crashes if this control sequence is sent.
| ID | ASCII | Name | Status |
|:---:|:-----:|:-----|:------:|
| `ENQ` | `0x05` | [Enquiry](sequences/enq.md) | ✅ |
| `BEL` | `0x07` | [Bell](sequences/bel.md) | ❌ |
| `BS` | `0x08` | [Backspace](sequences/bs.md) | ⚠️ |
| `TAB` | `0x09` | [Tab](sequences/tab.md) | ⚠️ |
| `LF` | `0x0A` | [Linefeed](sequences/lf.md) | ⚠️ |
| `VT` | `0x0B` | [Vertical Tab](sequences/vt.md) | ✅ |
| `FF` | `0x0C` | [Form Feed](sequences/ff.md) | ✅ |
| `CR` | `0x0D` | [Carriage Return](sequences/cr.md) | ⚠️ |
| `SO` | `0x0E` | [Shift Out](#) | ❌ |
| `SI` | `0x0F` | [Shift In](#) | ❌ |
| `CAN` | `0x18` | [Cancel Parsing](sequences/can.md) | ✅ |
| `SUB` | `0x1A` | [Cancel Parsing (Alias)](sequences/can.md) | ✅ |
| `IND` | `ESC D` | [Index](sequences/ind.md) | ✅ |
| `NEL` | `ESC E` | [Next Line](sequences/nel.md) | ✅ |
| `HTS` | `ESC H` | [Horizontal Tab Set](sequences/hts.md) | ✅ |
| `RI` | `ESC M` | [Reverse Index](sequences/ri.md) | ⚠️ |
| `SS2` | `ESC N` | [Single Shift 2](#) | ❌ |
| `SS3` | `ESC O` | [Single Shift 3](#) | ❌ |
| `SPA` | `ESC V` | [Start Protected Area](#) | ❌ |
| `EPA` | `ESC W` | [End Protected Area](#) | ❌ |
| ID | ASCII | Name | Status |
| :---: | :-----: | :----------------------------------------- | :----: |
| `ENQ` | `0x05` | [Enquiry](sequences/enq.md) | ✅ |
| `BEL` | `0x07` | [Bell](sequences/bel.md) | ❌ |
| `BS` | `0x08` | [Backspace](sequences/bs.md) | ⚠️ |
| `TAB` | `0x09` | [Tab](sequences/tab.md) | ⚠️ |
| `LF` | `0x0A` | [Linefeed](sequences/lf.md) | ⚠️ |
| `VT` | `0x0B` | [Vertical Tab](sequences/vt.md) | ✅ |
| `FF` | `0x0C` | [Form Feed](sequences/ff.md) | ✅ |
| `CR` | `0x0D` | [Carriage Return](sequences/cr.md) | ⚠️ |
| `SO` | `0x0E` | [Shift Out](#) | ❌ |
| `SI` | `0x0F` | [Shift In](#) | ❌ |
| `CAN` | `0x18` | [Cancel Parsing](sequences/can.md) | ✅ |
| `SUB` | `0x1A` | [Cancel Parsing (Alias)](sequences/can.md) | ✅ |
| `IND` | `ESC D` | [Index](sequences/ind.md) | ✅ |
| `NEL` | `ESC E` | [Next Line](sequences/nel.md) | ✅ |
| `HTS` | `ESC H` | [Horizontal Tab Set](sequences/hts.md) | ✅ |
| `RI` | `ESC M` | [Reverse Index](sequences/ri.md) | ⚠️ |
| `SS2` | `ESC N` | [Single Shift 2](#) | ❌ |
| `SS3` | `ESC O` | [Single Shift 3](#) | ❌ |
| `SPA` | `ESC V` | [Start Protected Area](#) | ❌ |
| `EPA` | `ESC W` | [End Protected Area](#) | ❌ |

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docs/sequences/bel.md
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# Bell
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x07` |
| Hex | `0x07` |
Rings a "bell" to alert the operator to some condition.
## Implementation Details
* ghostty logs "BELL"
- ghostty logs "BELL"
## TODO
* Add a configurable visual bell -- common in most terminal emulators --
to flash the border.
* Mark the window as requesting attention, most operating systems support
this. For example, Windows windows will flash in the toolbar.
* Support an audible bell.
- Add a configurable visual bell -- common in most terminal emulators --
to flash the border.
- Mark the window as requesting attention, most operating systems support
this. For example, Windows windows will flash in the toolbar.
- Support an audible bell.
## References
* https://vt100.net/docs/vt100-ug/chapter3.html
- https://vt100.net/docs/vt100-ug/chapter3.html

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docs/sequences/bs.md
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# Backspace
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x08` |
| Hex | `0x08` |
Move the cursor left one cell.
@@ -11,9 +11,9 @@ TODO: Details about how this interacts with soft wrapping.
## Implementation Details
* ghostty implements this naively as `cursor.x -|= 1` (`-|=` being a
saturating subtraction).
- ghostty implements this naively as `cursor.x -|= 1` (`-|=` being a
saturating subtraction).
## TODO
* Soft wrap integration
- Soft wrap integration

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docs/sequences/can.md
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# Cancel Parsing
| | |
| --- | --- |
| Text | |
| Hex | `0x18` or `0x1A` |
| | |
| ---- | ---------------- |
| Text | |
| Hex | `0x18` or `0x1A` |
Cancels sequence parsing. Any partially completed sequence such as `ESC`
can send `0x18` and revert back to an unparsed state. The sequence characters

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docs/sequences/cr.md
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# Carriage Return
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x0D` |
| Hex | `0x0D` |
Moves the cursor to the left-most column and resets any pending wrap flags.
## TODO
* Integration with left/right scrolling margins
* Integration with origin mode
- Integration with left/right scrolling margins
- Integration with origin mode

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docs/sequences/enq.md
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# Enquiry (Answerback)
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x05` |
| Hex | `0x05` |
Sends an answerback string. In the VT100, this was configurable by the
operator.
## Implementation Details
* ghostty always sends `""`
- ghostty always sends `""`
## TODO
* Make the answerback configurable
- Make the answerback configurable
## References
* https://vt100.net/docs/vt100-ug/chapter3.html
- https://vt100.net/docs/vt100-ug/chapter3.html

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docs/sequences/ff.md
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# Form Feed
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x0C` |
| Hex | `0x0C` |
Equivalent to [linefeed](lf.md).

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docs/sequences/hts.md
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# Horizontal Tab Set
| | |
| --- | --- |
| | |
| ---- | ----------- |
| Text | `ESC H` |
| Hex | `0x18 0x48` |

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docs/sequences/ind.md
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# Index
| | |
| --- | --- |
| | |
| ---- | ----------- |
| Text | `ESC D` |
| Hex | `0x18 0x44` |
@@ -10,10 +10,10 @@ if necessary. This always unsets the pending wrap state.
If the cursor is currently outside the scrolling region:
* move the cursor down one line if it is not on bottom line of the screen.
- move the cursor down one line if it is not on bottom line of the screen.
If the cursor is inside the scrolling region:
* If the cursor is on the bottom-most line of the screen: invoke
[scroll up](su.md) with the value `1`.
* Else: move the cursor one line down.
- If the cursor is on the bottom-most line of the screen: invoke
[scroll up](su.md) with the value `1`.
- Else: move the cursor one line down.

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docs/sequences/lf.md
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# Linefeed
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x0A` |
| Hex | `0x0A` |
Invoke [Index](ind.md).
## TODO
* Linefeed mode (mode 20)
- Linefeed mode (mode 20)

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docs/sequences/nel.md
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# Index
| | |
| --- | --- |
| | |
| ---- | ----------- |
| Text | `ESC E` |
| Hex | `0x18 0x45` |

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docs/sequences/ri.md
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# Reverse Index
| | |
| --- | --- |
| | |
| ---- | ----------- |
| Text | `ESC M` |
| Hex | `0x18 0x4D` |
@@ -9,13 +9,13 @@ Reverse [index](ind.md). This unsets the pending wrap state.
If the cursor is outside of the scrolling region:
* move the cursor one line up unless it is the top-most line of the screen.
- move the cursor one line up unless it is the top-most line of the screen.
If the cursor is inside the scrolling region:
* If the cursor is on the top-most line: invoke [scroll down](#) with value `1`
* Else: move the cursor one line up.
- If the cursor is on the top-most line: invoke [scroll down](#) with value `1`
- Else: move the cursor one line up.
## TODO
* Scroll region edge cases
- Scroll region edge cases

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docs/sequences/tab.md
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# Tab
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x09` |
| Hex | `0x09` |
Move the cursor right to the next tab stop.
@@ -17,5 +17,5 @@ Initially, tab stops are set on every 8th column.
## TODO
* Integration with left/right margins of the scrolling region.
* How does horizontal tab interact with the pending wrap state?
- Integration with left/right margins of the scrolling region.
- How does horizontal tab interact with the pending wrap state?

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docs/sequences/vt.md
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# Vertical Tab
| | |
| --- | --- |
| | |
| ---- | ------ |
| Text | |
| Hex | `0x0B` |
| Hex | `0x0B` |
Equivalent to [linefeed](lf.md).