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104 lines
1.9 KiB
Plaintext
104 lines
1.9 KiB
Plaintext
import VTSequence from "@/components/VTSequence";
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# Insert Character (ICH)
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<VTSequence sequence={["CSI", "Pn", "@"]} />
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Insert `n` blank characters at the current cursor position and shift
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existing cell contents right.
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The parameter `n` must be an integer greater than or equal to 1. If `n` is less than
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or equal to 0, adjust `n` to be 1. If `n` is omitted, `n` defaults to 1.
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This sequence always unsets the pending wrap state.
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If the cursor position is outside of the [left and right margins](#TODO),
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this sequence does not change the screen, but the pending wrap state is
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still reset.
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Existing cells shifted beyond the right margin are deleted. Inserted cells
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are blank with the background color colored according to the current SGR state.
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## Validation
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### ICH V-1: No Scroll Region, Fits on Screen
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```bash
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printf "ABC"
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printf "\033[1G"
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printf "\033[2@"
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```
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```
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|XcABC_____|
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```
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### ICH V-2: SGR State
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```bash
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printf "ABC"
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printf "\033[1G"
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printf "\033[41m"
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printf "\033[2@"
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printf "X"
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```
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```
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|c_ABC_____|
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```
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The `c_` cells should both have a red background. The `ABC` cells should
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remain unchanged in style.
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### ICH V-3: Shifting Content Off the Screen
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```bash
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cols=$(tput cols)
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printf "\033[${cols}G"
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printf "\033[2D"
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printf "ABC"
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printf "\033[2D"
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printf "\033[2@"
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printf "X"
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```
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```
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|_______XcA|
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```
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### ICH V-4: Inside Left/Right Scroll Region
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```bash
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printf "\033[1;1H" # move to top-left
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printf "\033[0J" # clear screen
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printf "\033[?69h" # enable left/right margins
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printf "\033[3;5s" # scroll region left/right
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printf "\033[3G"
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printf "ABC"
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printf "\033[3G"
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printf "\033[2@"
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printf "X"
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```
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```
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|__XcA_____|
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```
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### ICH V-5: Outside Left/Right Scroll Region
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```bash
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printf "\033[1;1H" # move to top-left
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printf "\033[0J" # clear screen
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printf "\033[?69h" # enable left/right margins
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printf "\033[3;5s" # scroll region left/right
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printf "\033[3G"
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printf "ABC"
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printf "\033[1G"
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printf "\033[2@"
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printf "X"
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```
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```
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|XcABC_____|
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```
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