Terminal control/Unicode output: Difference between revisions
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UTF supported: △
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=={{header|jq}}==
{{Works with |jq|>1.4}}
The jq "env" function is required to inspect environment variables. It is NOT available in jq version 1.4.
Note also that "The values of locale categories are determined by a precedence order ..."
-- http://pubs.opengroup.org/onlinepubs/007908799/xbd/envvar.html
"has_unicode_support" therefore cannot simply test whether one of the variables LC_ALL, LC_TYPE and LANG contains the string UTF.
<lang jq>def has_unicode_support:
def utf: if . == null then false else contains("UTF") or contains("utf") end;
env.LC_ALL
| if utf then true
elif . != null and . != "" then false
elif env.LC_CTYPE | utf then true
else env.LANG | utf
end ;
def task:
if has_unicode_support then "\u25b3"
else error("HW65001 This program requires a Unicode-compatible terminal")
end ;
task</lang>
{{Out}}
$ jq -M -r -n -f Terminal_control.jq
jq: error: HW65001 This program requires a Unicode-compatible terminal
# In a galaxy not far away:
$ jq -M -r -n -f Terminal_control.jq
△
=={{header|Lasso}}==
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