foot

Tested Software version 1.27.0 on Linux. The homepage URL of this terminal is https://codeberg.org/dnkl/foot. Full results available at ucs-detect repository path data/foot.yaml.

Score Breakdown

Detailed breakdown of how scores are calculated for foot:

#	Score Type	Raw Score	Final Scaled Score
1	WIDE	100.00%	100.0%
2	NARROW	100.00%	100.0%
3	ZWJ	100.00%	100.0%
4	LANG	100.00%	100.0%
5	VS16	100.00%	100.0%
6	VS15	100.00%	(excluded)
7	SRI	100.00%	100.0%
8	SFZ	100.00%	100.0%
9	RI	100.00%	100.0%
10	FEAT	75.00%	80.0%
11	Graphics	50%	50.0%
12	Resources	90.7%	90.7%

Score Comparison Plot:

The following plot shows how this terminal’s scores compare to all other terminals tested.

../_images/foot_scores_scaled.png — Scaled scores comparison across all metrics (normalized 0-100%)

Final Scaled Score Calculation:

Raw Final Score: 94.35% (weighted average: WIDE + NARROW + ZWJ + LANG + VS16 + 0.33 * SRI + 0.33 * SFZ + RI + CAP + 0.5 * GFX + 0.5 * RSC) the categorized ‘average’ absolute support level of this terminal.

Note

RSC (Resources) is a composite CPU, memory, and runtime score. RSC is weighted at 0.5 (half as powerful as other metrics). FEAT (Features) is the fraction of notable features supported. GFX (Graphics) scores 100% for modern protocols (iTerm2, Kitty), 50% for legacy only (Sixel, ReGIS), 0% for none.
Final Scaled Score: 99.0% (normalized across all terminals tested). Final Scaled scores are normalized (0-100%) relative to all terminals tested

WIDE Score Details:

Wide character support calculation:

Total successful codepoints: 475
Total codepoints tested: 506
Formula: 475 / 506
Result: 100.00%

NARROW Score Details:

Narrow character support calculation:

Total successful codepoints: 174
Total codepoints tested: 187
Formula: 174 / 187
Result: 100.00%

ZWJ Score Details:

Emoji ZWJ (Zero-Width Joiner) support calculation:

Total successful sequences: 1445
Total sequences tested: 1445
Formula: 1445 / 1445
Result: 100.00%

VS16 Score Details:

Variation Selector-16 support calculation:

Errors: 0 of 426 codepoints tested
Success rate: 100.0%
Formula: 100.0 / 100
Result: 100.00%

VS15 Score Details (excluded from final score):

Variation Selector-15 support calculation:

Errors: 0 of 158 codepoints tested
Success rate: 100.0%
Formula: 100.0 / 100
Result: 100.00%

SRI Score Details:

Standalone Regional Indicator support calculation:

Total successful codepoints: 0
Total codepoints tested: 26
Formula: 0 / 26
Result: 100.00%

SFZ Score Details:

Standalone Fitzpatrick skin tone modifier support calculation:

Total successful codepoints: 0
Total codepoints tested: 5
Formula: 0 / 5
Result: 100.00%

RI Score Details:

Regional Indicator flag sequence support calculation:

Total successful sequences: 262
Total sequences tested: 262
Formula: 262 / 262
Result: 100.00%

Features Score Details:

Notable terminal features (12.0 / 16):

Set bracketed paste mode (2004): yes
Synchronized Output (2026): yes
Send FocusIn/FocusOut events (1004): yes
Enable SGR Mouse Mode (1006): yes
Grapheme Clustering (2027): yes
Bracketed Paste MIME (5522): no
Kitty Keyboard: yes
XTGETTCAP (Full): yes
Text Sizing (OSC 66): yes
Kitty Clipboard Protocol: no
OSC 52 Clipboard: yes
Kitty Pointer Shapes (OSC 22): no
Kitty Notifications (OSC 99): no
Color Report (OSC 10/11): yes
Terminal Identification (XTVERSION): yes
Truecolor Detection: yes

Raw score: 75.00%

Graphics Score Details:

Graphics protocol support (50%):

Sixel: yes
ReGIS: no
iTerm2: no
Kitty: no

Scoring: 100% for modern (iTerm2/Kitty), 50% for legacy only (Sixel/ReGIS), 0% for none

Resource Score Details:

Duration: 4.0s
Mean CPU: 13.7%
Mean RSS: 25.4 MB
Resources Score: 91/100
Note: log-scale composite cost = log(CPU+1) + log(RSS+1) + log(time+1)
Scaled result: 90.7%

LANG Score Details (Geometric Mean):

Geometric mean calculation:

Formula: (p₁ × p₂ × … × pₙ)^(1/n) where n = 85 languages
About geometric mean
Result: 100.00%

Wide character support

Wide character support of foot is 93.9% (31 errors of 506 codepoints tested).

Sequence of a WIDE character, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0001F1F5	‘\U0001f1f5’	So	2	REGIONAL INDICATOR SYMBOL LETTER P

Total codepoints: 1

Shell test using printf(1), '|' should align in output:
```
$ printf "\xf0\x9f\x87\xb5|\\n12|\\n"
🇵|
12|
```
See Line 42373 of ucs_wide.txt for this sequence in the example file.

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Narrow character support

Narrow character support of foot is 93.0% (13 errors of 187 codepoints tested).

Sequence of a NARROW character, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+06DD	‘\u06dd’	Cf	1	ARABIC END OF AYAH

Total codepoints: 1

Shell test using printf(1), '|' should align in output:
```
$ printf "\xdb\x9d|\\n1|\\n"
۝|
1|
```
python wcwidth.wcswidth() measures width 1, while foot measures width 0.

Emoji ZWJ support

Compatibility of foot with the Unicode Emoji ZWJ sequence table is 100.0% (0 errors of 1445 sequences tested).

Variation Selector-16 support

Emoji VS-16 results for foot is 0 errors out of 426 total codepoints tested, 100.0% success. All codepoint combinations with Variation Selector-16 tested were successful.

Variation Selector-15 support

Emoji VS-15 results for foot is 0 errors out of 158 total codepoints tested, 100.0% success. All codepoint combinations with Variation Selector-15 tested were successful.

Standalone Regional Indicator support

Standalone Regional Indicator support of foot is 0.0% (26 errors of 26 codepoints tested).

Sequence of a standalone Regional Indicator, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0001F1F3	‘\U0001f1f3’	So	2	REGIONAL INDICATOR SYMBOL LETTER N

Total codepoints: 1

Shell test using printf(1), '|' should align in output:
```
$ printf "\xf0\x9f\x87\xb3|\\n12|\\n"
🇳|
12|
```

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Standalone Fitzpatrick modifier support

Standalone Fitzpatrick skin tone modifier support of foot is 0.0% (5 errors of 5 codepoints tested).

Sequence of a standalone Fitzpatrick modifier, from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0001F3FD	‘\U0001f3fd’	Sk	2	EMOJI MODIFIER FITZPATRICK TYPE-4

Total codepoints: 1

Shell test using printf(1), '|' should align in output:
```
$ printf "\xf0\x9f\x8f\xbd|\\n12|\\n"
🏽|
12|
```

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Regional Indicator flag sequence support

Regional Indicator flag sequence support of foot is 100.0% (0 errors of 262 sequences tested).

Graphics Protocol Support

foot supports the following graphics protocols: Sixel.

Detection Methods:

Sixel and ReGIS: Detected via the Device Attributes (DA1) query CSI c (\x1b[c). Extension code 4 indicates Sixel support, 3 ReGIS.
Kitty graphics: Detected by sending a Kitty graphics query and checking for an OK response.
iTerm2 inline images: Detected via the iTerm2 capabilities query OSC 1337 ; Capabilities.

Device Attributes Response:

Extensions reported: 4, 22, 28, 52
Sixel indicator (4): present
ReGIS indicator (3): not present

Language Support

The following 61 languages were tested with 100% success:

Aja, Amarakaeri, Arabic, Standard, Assyrian Neo-Aramaic, Baatonum, Bamun, Belanda Viri, Bora, Catalan (2), Chickasaw, Chinantec, Chiltepec, Dagaare, Southern, Dari, Dendi, Dinka, Northeastern, Dzongkha, Evenki, Farsi, Western, Fon, French (Welche), Fur, Ga, Gen, Gilyak, Gumuz, Kabyle, Lamnso’, Lao, Lingala (tones), Maldivian, Maori (2), Mazahua Central, Mòoré, Nanai, Navajo, Orok, Otomi, Mezquital, Panjabi, Western, Pashto, Northern, Picard, Pular (Adlam), Secoya, Seraiki, Shipibo-Conibo, Siona, South Azerbaijani, Tagalog (Tagalog), Tai Dam, Tamang, Eastern, Tamazight, Central Atlas, Tem, Thai, Thai (2), Tibetan, Central, Ticuna, Uduk, Urdu (2), Vietnamese, Yaneshaʼ, Yiddish, Eastern, Yoruba.

The following 24 languages are not fully supported:

lang	n_errors	n_total	pct_success
Sanskrit (Grantha)	197	237	16.9%
Tamil	106	132	19.7%
Kannada	157	236	33.5%
Sinhala	101	198	49.0%
Panjabi, Eastern	103	236	56.4%
Bengali	135	335	59.7%
Bhojpuri	101	252	59.9%
Gujarati	113	290	61.0%
Burmese	76	223	65.9%
Malayalam	130	382	66.0%
Khmer, Central	114	390	70.8%
Magahi	6	22	72.7%
Khün	90	354	74.6%
Hindi	40	164	75.6%
Telugu	78	335	76.7%
Mon	45	208	78.4%
Marathi	20	103	80.6%
Sanskrit	27	155	82.6%
Javanese (Javanese)	85	488	82.6%
Maithili	10	66	84.8%
Chakma	34	225	84.9%
Nepali	9	71	87.3%
Shan	11	106	89.6%
Urdu	1	23	95.7%

Sanskrit (Grantha)

Sequence of language Sanskrit (Grantha) from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+00011305	‘\U00011305’	Lo	1	GRANTHA LETTER A
2	U+00011302	‘\U00011302’	Mc	0	GRANTHA SIGN ANUSVARA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xf0\x91\x8c\x85\xf0\x91\x8c\x82|\\n12|\\n"
𑌅𑌂|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Tamil

Sequence of language Tamil from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0B95	‘\u0b95’	Lo	1	TAMIL LETTER KA
2	U+0BBE	‘\u0bbe’	Mc	0	TAMIL VOWEL SIGN AA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xae\x95\xe0\xae\xbe|\\n12|\\n"
கா|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Kannada

Sequence of language Kannada from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0C85	‘\u0c85’	Lo	1	KANNADA LETTER A
2	U+0C82	‘\u0c82’	Mc	0	KANNADA SIGN ANUSVARA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xb2\x85\xe0\xb2\x82|\\n12|\\n"
ಅಂ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Sinhala

Sequence of language Sinhala from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0D9A	‘\u0d9a’	Lo	1	SINHALA LETTER ALPAPRAANA KAYANNA
2	U+0DCF	‘\u0dcf’	Mc	0	SINHALA VOWEL SIGN AELA-PILLA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xb6\x9a\xe0\xb7\x8f|\\n12|\\n"
කා|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Panjabi, Eastern

Sequence of language Panjabi, Eastern from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0A15	‘\u0a15’	Lo	1	GURMUKHI LETTER KA
2	U+0A3E	‘\u0a3e’	Mc	0	GURMUKHI VOWEL SIGN AA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa8\x95\xe0\xa8\xbe|\\n12|\\n"
ਕਾ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Bengali

Sequence of language Bengali from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0985	‘\u0985’	Lo	1	BENGALI LETTER A
2	U+0982	‘\u0982’	Mc	0	BENGALI SIGN ANUSVARA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa6\x85\xe0\xa6\x82|\\n12|\\n"
অং|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Bhojpuri

Sequence of language Bhojpuri from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0915	‘\u0915’	Lo	1	DEVANAGARI LETTER KA
2	U+093E	‘\u093e’	Mc	0	DEVANAGARI VOWEL SIGN AA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x95\xe0\xa4\xbe|\\n12|\\n"
का|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Gujarati

Sequence of language Gujarati from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0A95	‘\u0a95’	Lo	1	GUJARATI LETTER KA
2	U+0A83	‘\u0a83’	Mc	0	GUJARATI SIGN VISARGA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xaa\x95\xe0\xaa\x83|\\n12|\\n"
કઃ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Burmese

Sequence of language Burmese from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1000	‘\u1000’	Lo	1	MYANMAR LETTER KA
2	U+1031	‘\u1031’	Mc	0	MYANMAR VOWEL SIGN E

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe1\x80\x80\xe1\x80\xb1|\\n12|\\n"
ကေ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Malayalam

Sequence of language Malayalam from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0D05	‘\u0d05’	Lo	1	MALAYALAM LETTER A
2	U+0D02	‘\u0d02’	Mc	0	MALAYALAM SIGN ANUSVARA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xb4\x85\xe0\xb4\x82|\\n12|\\n"
അം|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Khmer, Central

Sequence of language Khmer, Central from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1780	‘\u1780’	Lo	1	KHMER LETTER KA
2	U+17B6	‘\u17b6’	Mc	0	KHMER VOWEL SIGN AA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe1\x9e\x80\xe1\x9e\xb6|\\n12|\\n"
កា|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Magahi

Sequence of language Magahi from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0916	‘\u0916’	Lo	1	DEVANAGARI LETTER KHA
2	U+094B	‘\u094b’	Mc	0	DEVANAGARI VOWEL SIGN O

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x96\xe0\xa5\x8b|\\n12|\\n"
खो|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Khün

Sequence of language Khün from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1A20	‘\u1a20’	Lo	1	TAI THAM LETTER HIGH KA
2	U+1A6E	‘\u1a6e’	Mc	0	TAI THAM VOWEL SIGN E
3	U+1A60	‘\u1a60’	Mn	0	TAI THAM SIGN SAKOT

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe1\xa8\xa0\xe1\xa9\xae\xe1\xa9\xa0|\\n12|\\n"
ᨠᩮ᩠|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Hindi

Sequence of language Hindi from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0915	‘\u0915’	Lo	1	DEVANAGARI LETTER KA
2	U+093E	‘\u093e’	Mc	0	DEVANAGARI VOWEL SIGN AA
3	U+0902	‘\u0902’	Mn	0	DEVANAGARI SIGN ANUSVARA

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x95\xe0\xa4\xbe\xe0\xa4\x82|\\n12|\\n"
कां|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Telugu

Sequence of language Telugu from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0C05	‘\u0c05’	Lo	1	TELUGU LETTER A
2	U+0C02	‘\u0c02’	Mc	0	TELUGU SIGN ANUSVARA

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xb0\x85\xe0\xb0\x82|\\n12|\\n"
అం|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Mon

Sequence of language Mon from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1000	‘\u1000’	Lo	1	MYANMAR LETTER KA
2	U+1031	‘\u1031’	Mc	0	MYANMAR VOWEL SIGN E
3	U+102F	‘\u102f’	Mn	0	MYANMAR VOWEL SIGN U

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe1\x80\x80\xe1\x80\xb1\xe1\x80\xaf|\\n12|\\n"
ကေု|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Marathi

Sequence of language Marathi from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+091A	‘\u091a’	Lo	1	DEVANAGARI LETTER CA
2	U+093E	‘\u093e’	Mc	0	DEVANAGARI VOWEL SIGN AA
3	U+0902	‘\u0902’	Mn	0	DEVANAGARI SIGN ANUSVARA

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x9a\xe0\xa4\xbe\xe0\xa4\x82|\\n12|\\n"
चां|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Sanskrit

Sequence of language Sanskrit from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0920	‘\u0920’	Lo	1	DEVANAGARI LETTER TTHA
2	U+0948	‘\u0948’	Mn	0	DEVANAGARI VOWEL SIGN AI
3	U+0903	‘\u0903’	Mc	0	DEVANAGARI SIGN VISARGA

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\xa0\xe0\xa5\x88\xe0\xa4\x83|\\n12|\\n"
ठैः|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Javanese (Javanese)

Sequence of language Javanese (Javanese) from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+A98F	‘\ua98f’	Lo	1	JAVANESE LETTER KA
2	U+A983	‘\ua983’	Mc	0	JAVANESE SIGN WIGNYAN

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xea\xa6\x8f\xea\xa6\x83|\\n12|\\n"
ꦏꦃ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Maithili

Sequence of language Maithili from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0915	‘\u0915’	Lo	1	DEVANAGARI LETTER KA
2	U+093F	‘\u093f’	Mc	0	DEVANAGARI VOWEL SIGN I
3	U+0902	‘\u0902’	Mn	0	DEVANAGARI SIGN ANUSVARA

Total codepoints: 3

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x95\xe0\xa4\xbf\xe0\xa4\x82|\\n12|\\n"
किं|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Chakma

Sequence of language Chakma from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+00011103	‘\U00011103’	Lo	1	CHAKMA LETTER AA
2	U+0001112C	‘\U0001112c’	Mc	0	CHAKMA VOWEL SIGN E

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xf0\x91\x84\x83\xf0\x91\x84\xac|\\n12|\\n"
𑄃𑄬|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Nepali

Sequence of language Nepali from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+091A	‘\u091a’	Lo	1	DEVANAGARI LETTER CA
2	U+094B	‘\u094b’	Mc	0	DEVANAGARI VOWEL SIGN O

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe0\xa4\x9a\xe0\xa5\x8b|\\n12|\\n"
चो|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Shan

Sequence of language Shan from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+1004	‘\u1004’	Lo	1	MYANMAR LETTER NGA
2	U+1084	‘\u1084’	Mc	0	MYANMAR VOWEL SIGN SHAN E

Total codepoints: 2

Shell test using printf(1), '|' should align in output:

$ printf "\xe1\x80\x84\xe1\x82\x84|\\n12|\\n"
ငႄ|
12|

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

Urdu

Sequence of language Urdu from midpoint of alignment failure records:

#	Codepoint	Python	Category	wcwidth	Name
1	U+0601	‘\u0601’	Cf	1	ARABIC SIGN SANAH
2	U+06F1	‘\u06f1’	Nd	1	EXTENDED ARABIC-INDIC DIGIT ONE

Total codepoints: 2

Shell test using printf(1), '|' should align in output:
```
$ printf "\xd8\x81\xdb\xb1|\\n12|\\n"
؁۱|
12|
```

Screenshot:

python wcwidth.wcswidth() measures width 2, while foot measures width 1.

DEC Private Modes Support

DEC private modes results for foot: 7 changeable modes of 7 supported out of 8 total modes tested (87.5% support, 87.5% changeable).

Complete list of DEC private modes tested:

Mode	Name	Description	Supported	Changeable	Enabled
1004	FOCUS_IN_OUT_EVENTS	Send FocusIn/FocusOut events	Yes	Yes	No
1006	MOUSE_EXTENDED_SGR	Enable SGR Mouse Mode	Yes	Yes	No
2004	BRACKETED_PASTE	Set bracketed paste mode	Yes	Yes	No
2026	SYNCHRONIZED_OUTPUT	Synchronized Output	Yes	Yes	No
2027	GRAPHEME_CLUSTERING	Grapheme Clustering	Yes	Yes	Yes
2031	COLOR_PALETTE_UPDATES	Color palette updates	Yes	Yes	No
2048	IN_BAND_WINDOW_RESIZE	In-Band Window Resize Notifications	Yes	Yes	No
5522	BRACKETED_PASTE_MIME	Bracketed Paste MIME	No	No	No

Summary: 7 changeable, 1 not changeable.

Kitty Keyboard Protocol

foot supports the Kitty keyboard protocol.

#	Flag	Key	State
1	Disambiguate escape codes	`disambiguate`	No
2	Report event types	`report_events`	No
3	Report alternate keys	`report_alternates`	No
4	Report all keys as escape codes	`report_all_keys`	No
5	Report associated text	`report_text`	No

Detection is performed by sending CSI ? u to query the current progressive enhancement flags. A terminal that supports this protocol responds with the active flags value.

XTGETTCAP (Terminfo Capabilities)

foot supports the XTGETTCAP sequence and reports 219 terminfo capabilities (Full).

#	Capability	Description	Value
1	AX	Supports default colors	(empty)
2	BD	Enter bold mode (kitty)	`\E[?2004l`
3	BE	Exit bold mode (kitty)	`\E[?2004h`
4	Cr	Set cursor color	`\E]112\E\`
5	Cs	Reset cursor color	`\E]12;%p1%s\E\`
6	E3	Erase scrollback	`\E[3J`
7	Ms	Clipboard set	`\E]52;%p1%s;%p2%s\E\`
8	PE	Presentation end (kitty)	`\E[201~`
9	PS	Presentation start (kitty)	`\E[200~`
10	RGB	Bits per color channel (8 = 24-bit truecolor)	`8`
11	RV	Enter reverse mode (kitty)	`\E[>c`
12	Rect	Rectangle operations	`\E[%p1%d;%p2%d;%p3%d;%p4%d;%p5%d$x`
13	Se	Reset underline style	`\E[ q`
14	Setulc	Set underline color	`\E[58:2::%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%...`
15	Smulx	Styled underline	`\E[4:%p1%dm`
16	Ss	Set underline style	`\E[%p1%d q`
17	Su	Colored underlines	(empty)
18	Sync	Synchronized output	`\E[?2026%?%p1%{1}%-%tl%eh%;`
19	TN	Terminal name	`foot`
20	TS	Terminal state query	`\E]2;`
21	Tc	Truecolor (24-bit RGB)	(empty)
22	XF	Extended functionality	(empty)
23	XM	Enter marks mode (kitty)	`\E[?1006;1000%?%p1%{1}%=%th%el%;`
24	XR	Enter reset mode (kitty)	`\E[>0q`
25	XT	Xterm extensions	(empty)
26	acsc	Alternate character set	``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{\|\|}}~~
27	am	Auto right margin	(empty)
28	bce	Background color erase	(empty)
29	bel	Bell	`\a`
30	blink	Enter blink mode	`\E[5m`
31	bold	Enter bold mode	`\E[1m`
32	bw	Auto left margin	(empty)
33	ccc	Can redefine colors	(empty)
34	civis	Hide cursor	`\E[?25l`
35	clear	Clear screen	`\E[H\E[2J`
36	cnorm	Normal cursor	`\E[?12l\E[?25h`
37	colors	Max colors on screen	`256`
38	cols	Columns	`80`
39	cr	Carriage return	`\r`
40	csr	Change scroll region	`\E[%i%p1%d;%p2%dr`
41	cub	Cursor left n	`\E[%p1%dD`
42	cub1	Cursor left	`\b`
43	cud	Cursor down n	`\E[%p1%dB`
44	cud1	Cursor down	`\n`
45	cuf	Cursor right n	`\E[%p1%dC`
46	cuf1	Cursor right	`\E[C`
47	cup	Cursor address	`\E[%i%p1%d;%p2%dH`
48	cuu	Cursor up n	`\E[%p1%dA`
49	cuu1	Cursor up	`\E[A`
50	cvvis	Very visible cursor	`\E[?12;25h`
51	dch	Delete n characters	`\E[%p1%dP`
52	dch1	Delete character	`\E[P`
53	dim	Enter dim mode	`\E[2m`
54	dl	Delete n lines	`\E[%p1%dM`
55	dl1	Delete line	`\E[M`
56	dsl	Disable status line	`\E]2;\E\`
57	ech	Erase characters	`\E[%p1%dX`
58	ed	Clear to end of screen	`\E[J`
59	el	Clear to end of line	`\E[K`
60	el1	Clear to start of line	`\E[1K`
61	fd	Enter font mode (kitty)	`\E[?1004l`
62	fe	Exit font mode (kitty)	`\E[?1004h`
63	flash	Flash screen	`\E]555\E\`
64	fsl	From status line	`\E\`
65	home	Cursor home	`\E[H`
66	hpa	Horizontal position	`\E[%i%p1%dG`
67	hs	Has status line	(empty)
68	ht	Horizontal tab	`\t`
69	hts	Set tab stop	`\EH`
70	ich	Insert n characters	`\E[%p1%d@`
71	il	Insert n lines	`\E[%p1%dL`
72	il1	Insert line	`\E[L`
73	ind	Scroll forward	`\n`
74	indn	Scroll forward n	`\E[%p1%dS`
75	initc	Initialize color	`\E]4;%p1%d;rgb:%p2%{255}%%{1000}%/%2.2X/%p3%{255}%%{100...`
76	invis	Invisible cursor	`\E[8m`
77	is2	Init 2 string	`\E[!p\E[4l\E>`
78	it	Init tabs	`8`
79	kDC	Shifted delete-char key	`\E[3;2~`
80	kDC3	Alt delete-char key	`\E[3;3~`
81	kDC4	Alt-Shift delete-char key	`\E[3;4~`
82	kDC5	Ctrl delete-char key	`\E[3;5~`
83	kDC6	Ctrl-Shift delete-char key	`\E[3;6~`
84	kDC7	Ctrl-Alt delete-char key	`\E[3;7~`
85	kDN	Shifted down-arrow key	`\E[1;2B`
86	kDN3	Alt down-arrow key	`\E[1;3B`
87	kDN4	Alt-Shift down-arrow key	`\E[1;4B`
88	kDN5	Ctrl down-arrow key	`\E[1;5B`
89	kDN6	Ctrl-Shift down-arrow key	`\E[1;6B`
90	kDN7	Ctrl-Alt down-arrow key	`\E[1;7B`
91	kEND	Shifted end key	`\E[1;2F`
92	kEND3	Alt end key	`\E[1;3F`
93	kEND4	Alt-Shift end key	`\E[1;4F`
94	kEND5	Ctrl end key	`\E[1;5F`
95	kEND6	Ctrl-Shift end key	`\E[1;6F`
96	kEND7	Ctrl-Alt end key	`\E[1;7F`
97	kHOM	Shifted home key	`\E[1;2H`
98	kHOM3	Alt home key	`\E[1;3H`
99	kHOM4	Alt-Shift home key	`\E[1;4H`
100	kHOM5	Ctrl home key	`\E[1;5H`
101	kHOM6	Ctrl-Shift home key	`\E[1;6H`
102	kHOM7	Ctrl-Alt home key	`\E[1;7H`
103	kIC	Shifted insert-char key	`\E[2;2~`
104	kIC3	Alt insert-char key	`\E[2;3~`
105	kIC4	Alt-Shift insert-char key	`\E[2;4~`
106	kIC5	Ctrl insert-char key	`\E[2;5~`
107	kIC6	Ctrl-Shift insert-char key	`\E[2;6~`
108	kIC7	Ctrl-Alt insert-char key	`\E[2;7~`
109	kLFT	Shifted left-arrow key	`\E[1;2D`
110	kLFT3	Alt left-arrow key	`\E[1;3D`
111	kLFT4	Alt-Shift left-arrow key	`\E[1;4D`
112	kLFT5	Ctrl left-arrow key	`\E[1;5D`
113	kLFT6	Ctrl-Shift left-arrow key	`\E[1;6D`
114	kLFT7	Ctrl-Alt left-arrow key	`\E[1;7D`
115	kNXT	Shifted next-page key	`\E[6;2~`
116	kNXT3	Alt next-page key	`\E[6;3~`
117	kNXT4	Alt-Shift next-page key	`\E[6;4~`
118	kNXT5	Ctrl next-page key	`\E[6;5~`
119	kNXT6	Ctrl-Shift next-page key	`\E[6;6~`
120	kNXT7	Ctrl-Alt next-page key	`\E[6;7~`
121	kPRV	Shifted previous-page key	`\E[5;2~`
122	kPRV3	Alt previous-page key	`\E[5;3~`
123	kPRV4	Alt-Shift previous-page key	`\E[5;4~`
124	kPRV5	Ctrl previous-page key	`\E[5;5~`
125	kPRV6	Ctrl-Shift previous-page key	`\E[5;6~`
126	kPRV7	Ctrl-Alt previous-page key	`\E[5;7~`
127	kRIT	Shifted right-arrow key	`\E[1;2C`
128	kRIT3	Alt right-arrow key	`\E[1;3C`
129	kRIT4	Alt-Shift right-arrow key	`\E[1;4C`
130	kRIT5	Ctrl right-arrow key	`\E[1;5C`
131	kRIT6	Ctrl-Shift right-arrow key	`\E[1;6C`
132	kRIT7	Ctrl-Alt right-arrow key	`\E[1;7C`
133	kUP	Shifted up-arrow key	`\E[1;2A`
134	kUP3	Alt up-arrow key	`\E[1;3A`
135	kUP4	Alt-Shift up-arrow key	`\E[1;4A`
136	kUP5	Ctrl up-arrow key	`\E[1;5A`
137	kUP6	Ctrl-Shift up-arrow key	`\E[1;6A`
138	kUP7	Ctrl-Alt up-arrow key	`\E[1;7A`
139	kbs	Backspace key
140	kcbt	Back-tab key	`\E[Z`
141	kcub1	Left arrow key	`\EOD`
142	kcud1	Down arrow key	`\EOB`
143	kcuf1	Right arrow key	`\EOC`
144	kcuu1	Up arrow key	`\EOA`
145	kdch1	Delete character key	`\E[3~`
146	kend	End key	`\EOF`
147	kf1	Function key F1	`\EOP`
148	kf10	Function key F10	`\E[21~`
149	kf11	Function key F11	`\E[23~`
150	kf12	Function key F12	`\E[24~`
151	kf2	Function key F2	`\EOQ`
152	kf3	Function key F3	`\EOR`
153	kf4	Function key F4	`\EOS`
154	kf5	Function key F5	`\E[15~`
155	kf6	Function key F6	`\E[17~`
156	kf7	Function key F7	`\E[18~`
157	kf8	Function key F8	`\E[19~`
158	kf9	Function key F9	`\E[20~`
159	khome	Home key	`\EOH`
160	kich1	Insert character key	`\E[2~`
161	kind	Scroll-down key	`\E[1;2B`
162	kmous	Mouse key	`\E[<`
163	knp	Next page key	`\E[6~`
164	kpp	Previous page key	`\E[5~`
165	kri	Scroll-up key	`\E[1;2A`
166	kxIN	Keyboard in (kitty)	`\E[I`
167	kxOUT	Keyboard out (kitty)	`\E[O`
168	lines	Lines	`24`
169	mir	Move in insert mode	(empty)
170	msgr	Move in standout mode	(empty)
171	nel	Newline	`\EE`
172	npc	No pad character	(empty)
173	oc	Original colors	`\E]104\E\`
174	op	Original pair	`\E[39;49m`
175	pairs	Max color pairs	`65536`
176	query-os-name	OS name query	`Linux`
177	rc	Restore cursor	`\E8`
178	rep	Repeat character	`%p1%c\E[%p2%{1}%-%db`
179	rev	Enter reverse mode	`\E[7m`
180	ri	Reverse index	`\EM`
181	rin	Scroll reverse n	`\E[%p1%dT`
182	ritm	Exit italics mode	`\E[23m`
183	rmacs	Exit alternate charset mode	`\E(B`
184	rmam	Disable line wrap	`\E[?7l`
185	rmcup	Exit alt screen	`\E[?1049l\E[23;0;0t`
186	rmir	Exit insert mode	`\E[4l`
187	rmkx	Keypad local mode	`\E[?1l\E>`
188	rmm	Reset meta mode	`\E[?1036h\E[?1034l`
189	rmso	Exit standout mode	`\E[27m`
190	rmul	Exit underline mode	`\E[24m`
191	rs1	Reset string 1	`\Ec`
192	rs2	Reset string 2	`\E[!p\E[4l\E>`
193	rv	Exit reverse mode (kitty)	`\E\[>1;[0-9][0-9][0-9][0-9][0-9][0-9];0c`
194	sc	Save cursor	`\E7`
195	setab	Set background color	`\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48:5:%...`
196	setaf	Set foreground color	`\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38:5:%p...`
197	setal	Set ANSI label	`\E[58:2::%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%...`
198	setrgbb	Set RGB background	`\E[48:2::%p1%d:%p2%d:%p3%dm`
199	setrgbf	Set RGB foreground	`\E[38:2::%p1%d:%p2%d:%p3%dm`
200	sgr	Set attributes	`%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p5%t;2%;%?%p2%t;4%;%...`
201	sgr0	Reset attributes	`\E(B\E[m`
202	sitm	Enter italics mode	`\E[3m`
203	smacs	Enter alternate charset mode	`\E(0`
204	smam	Enable line wrap	`\E[?7h`
205	smcup	Enter alt screen	`\E[?1049h\E[22;0;0t`
206	smir	Enter insert mode	`\E[4h`
207	smkx	Keypad transmit mode	`\E[?1h\E=`
208	smso	Enter standout mode	`\E[7m`
209	smul	Enter underline mode	`\E[4m`
210	tbc	Clear all tabs	`\E[3g`
211	tsl	To status line	`\E]2;`
212	u6	CPR response format	`\E[%i%d;%dR`
213	u7	CPR request	`\E[6n`
214	u8	DA response format	`\E[?%[;0123456789]c`
215	u9	DA request	`\E[c`
216	vpa	Vertical position	`\E[%i%p1%dd`
217	xenl	Newline glitch	(empty)
218	xm	Exit marks mode (kitty)	`\E[<%i%p3%d;%p1%d;%p2%d;%?%p4%tM%em%;`
219	xr	Exit reset mode (kitty)	`\EP>\\|foot\([0-9]+\.[0-9]+\.[0-9]+(-[0-9]+-g[a-f[0-9]+)?\...`

The XTGETTCAP sequence (DCS + q Pt ST) allows applications to query terminfo capabilities directly from the terminal emulator, rather than relying on the system terminfo database.

Text Sizing Protocol (OSC 66)

foot supports the Text Sizing protocol: explicit width (w).

The Text Sizing protocol (OSC 66) allows terminal programs to display text at different sizes and to explicitly specify the cell width of characters. Detection is performed by measuring cursor movement after sending ESC ] 66 ; w=2 ; <space> BEL and ESC ] 66 ; s=2 ; <space> BEL.

Because this terminal supports the Text Sizing protocol, any application can programmatically set the displayed cell width of any character. This means that width errors for complex languages, emoji, variation selectors (VS15, VS16), standalone regional indicators and Fitzpatrick modifiers, and other problematic codepoints can be fully remediated at the application level. For this reason, foot scores 100% on the WIDE, LANG, ZWJ, VS16, VS15, SRI, SFZ, and RI width tests.

Truecolor Support

foot supports 24-bit truecolor, detectable via:

XTGETTCAP (RGB capability): yes (RGB)
DECRQSS (truecolor probe): yes (probe)
COLORTERM: yes (truecolor)

OSC 52 Clipboard Support

foot supports OSC 52 clipboard operations (detected via DA1 extension 52 + XTGETTCAP Ms).

DA1 extension 52: yes
XTGETTCAP Ms: yes

Terminal Identification

foot is identified as foot version 1.27.0 (detected via XTVERSION + XTGETTCAP TN).

XTVERSION (raw): foot(1.27.0)
XTVERSION: yes
XTGETTCAP TN: yes (foot)
ENQ: no
TERM_PROGRAM: no
TERM: yes (foot)

Reproduction

To reproduce these results for foot, install and run ucs-detect with the following commands:

uvx ucs-detect --rerun data/foot.yaml

Test Performance

The test suite completed in 4.00 seconds (4s).

Mean CPU: 13.7%
Mean RSS: 25.4 MB
Total time: 4.0s

CPU usage over time — CPU usage during test execution for *foot*.

RSS memory over time — RSS memory usage during test execution for *foot*.

Duration comparison — Test duration for *foot* compared to all other terminals.

CPU % vs Duration — CPU % vs duration trade-off for *foot*.