[Feature Request] urfave/cli command completion for fish

[dsluo]

urfave/cli seems to support command completion for fish since version 1.22.0. I'd be great to have this enabled.

[kucukaslan]

I missed it.
It seems fish's autocompletions need to be precomputed. So it might be trickier to support bucket name and key completions.

BTW when I tried called App.ToFishCompletion() I got:

function __fish_s5cmd_no_subcommand --description 'Test if there has been any subcommand yet'
    for i in (commandline -opc)
        if contains -- $i ls cp rm mv mb rb select csv json parquet du cat pipe run sync version bucket-version presign head
            return 1
        end
    end
    return 0
end

complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l json -d 'enable JSON formatted output'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l numworkers -r -d 'number of workers execute operation on each object'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l retry-count -s r -r -d 'number of times that a request will be retried for failures'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l endpoint-url -r -d 'override default S3 host for custom services'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l no-verify-ssl -d 'disable SSL certificate verification'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l log -r -d 'log level: (trace, debug, info, error)'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l install-completion -d 'get completion installation instructions for your shell (only available for bash, pwsh, and zsh)'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l dry-run -d 'fake run; show what commands will be executed without actually executing them'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l stat -d 'collect statistics of program execution and display it at the end'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l no-sign-request -d 'do not sign requests: credentials will not be loaded if --no-sign-request is provided'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l use-list-objects-v1 -d 'use ListObjectsV1 API for services that don\'t support ListObjectsV2'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l request-payer -r -d 'who pays for request (access requester pays buckets)'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l profile -r -d 'use the specified profile from the credentials file'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l credentials-file -r -d 'use the specified credentials file instead of the default credentials file'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l help -s h -d 'show help'
complete -c s5cmd -n '__fish_s5cmd_no_subcommand' -f -l version -s v -d 'print the version'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'ls' -d 'list buckets and objects'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l etag -s e -d 'show entity tag (ETag) in the output'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l humanize -s H -d 'human-readable output for object sizes'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l storage-class -s s -d 'display full name of the object class'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from ls' -f -l show-fullpath -d 'shows only the fullpath names of the object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'cp' -d 'copy objects'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l flatten -s f -d 'flatten directory structure of source, starting from the first wildcard'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l no-clobber -s n -d 'do not overwrite destination if already exists'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l if-size-differ -s s -d 'only overwrite destination if size differs'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l if-source-newer -s u -d 'only overwrite destination if source modtime is newer'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l show-progress -s sp -d 'show a progress bar'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l no-follow-symlinks -d 'do not follow symbolic links'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l storage-class -r -d 'set storage class for target (\'STANDARD\',\'REDUCED_REDUNDANCY\',\'GLACIER\',\'STANDARD_IA\',\'ONEZONE_IA\',\'INTELLIGENT_TIERING\',\'DEEP_ARCHIVE\')'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l concurrency -s c -r -d 'number of concurrent parts transferred between host and remote server'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l part-size -s p -r -d 'size of each part transferred between host and remote server, in MiB'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l metadata -r -d 'set arbitrary metadata for the object, e.g. --metadata \'foo=bar\' --metadata \'fizz=buzz\''
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l metadata-directive -r -d 'set metadata directive for the object: COPY or REPLACE'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l sse -r -d 'perform server side encryption of the data at its destination, e.g. aws:kms'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l sse-kms-key-id -r -d 'customer master key (CMK) id for SSE-KMS encryption; leave it out if server-side generated key is desired'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l acl -r -d 'set acl for target: defines granted accesses and their types on different accounts/groups, e.g. cp --acl \'public-read\''
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l cache-control -r -d 'set cache control for target: defines cache control header for object, e.g. cp --cache-control \'public, max-age=345600\''
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l expires -r -d 'set expires for target (uses RFC3339 format): defines expires header for object, e.g. cp  --expires \'2024-10-01T20:30:00Z\''
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during copying, downloading and moving glacier objects'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l source-region -r -d 'set the region of source bucket; the region of the source bucket will be automatically discovered if --source-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l destination-region -r -d 'set the region of destination bucket: the region of the destination bucket will be automatically discovered if --destination-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l include -r -d 'include objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l content-type -r -d 'set content type for target: defines content type header for object, e.g. --content-type text/plain'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l content-encoding -r -d 'set content encoding for target: defines content encoding header for object, e.g. --content-encoding gzip'
complete -c s5cmd -n '__fish_seen_subcommand_from cp' -f -l content-disposition -r -d 'set content disposition for target: defines content disposition header for object, e.g. --content-disposition \'attachment; filename="filename.jpg"\''
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'rm' -d 'remove objects'
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l include -r -d 'include objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from rm' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'mv' -d 'move/rename objects'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l flatten -s f -d 'flatten directory structure of source, starting from the first wildcard'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l no-clobber -s n -d 'do not overwrite destination if already exists'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l if-size-differ -s s -d 'only overwrite destination if size differs'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l if-source-newer -s u -d 'only overwrite destination if source modtime is newer'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l show-progress -s sp -d 'show a progress bar'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l no-follow-symlinks -d 'do not follow symbolic links'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l storage-class -r -d 'set storage class for target (\'STANDARD\',\'REDUCED_REDUNDANCY\',\'GLACIER\',\'STANDARD_IA\',\'ONEZONE_IA\',\'INTELLIGENT_TIERING\',\'DEEP_ARCHIVE\')'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l concurrency -s c -r -d 'number of concurrent parts transferred between host and remote server'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l part-size -s p -r -d 'size of each part transferred between host and remote server, in MiB'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l metadata -r -d 'set arbitrary metadata for the object, e.g. --metadata \'foo=bar\' --metadata \'fizz=buzz\''
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l metadata-directive -r -d 'set metadata directive for the object: COPY or REPLACE'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l sse -r -d 'perform server side encryption of the data at its destination, e.g. aws:kms'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l sse-kms-key-id -r -d 'customer master key (CMK) id for SSE-KMS encryption; leave it out if server-side generated key is desired'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l acl -r -d 'set acl for target: defines granted accesses and their types on different accounts/groups, e.g. cp --acl \'public-read\''
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l cache-control -r -d 'set cache control for target: defines cache control header for object, e.g. cp --cache-control \'public, max-age=345600\''
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l expires -r -d 'set expires for target (uses RFC3339 format): defines expires header for object, e.g. cp  --expires \'2024-10-01T20:30:00Z\''
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during copying, downloading and moving glacier objects'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l source-region -r -d 'set the region of source bucket; the region of the source bucket will be automatically discovered if --source-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l destination-region -r -d 'set the region of destination bucket: the region of the destination bucket will be automatically discovered if --destination-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l include -r -d 'include objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l content-type -r -d 'set content type for target: defines content type header for object, e.g. --content-type text/plain'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l content-encoding -r -d 'set content encoding for target: defines content encoding header for object, e.g. --content-encoding gzip'
complete -c s5cmd -n '__fish_seen_subcommand_from mv' -f -l content-disposition -r -d 'set content disposition for target: defines content disposition header for object, e.g. --content-disposition \'attachment; filename="filename.jpg"\''
complete -c s5cmd -n '__fish_seen_subcommand_from mb' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'mb' -d 'make bucket'
complete -c s5cmd -n '__fish_seen_subcommand_from rb' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'rb' -d 'remove bucket'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'select' -d 'run SQL queries on objects'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l compression -r -d 'input compression format (options for AWS: GZIP or BZIP2)'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l query -s e -r -d 'SQL expression to use to select from the objects'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l output-format -r -d 'output format of the result (options: json, csv)'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during selecting objects'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from select' -f -l version-id -r -d 'use the specified version of the object'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_seen_subcommand_from select' -a 'csv' -d 'run queries on csv files'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l delimiter -r -d 'delimiter of the csv file.'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l use-header -r -d 'use header of the csv file. (options for AWS: IGNORE, NONE, USE)'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l compression -r -d 'input compression format (options for AWS: GZIP or BZIP2)'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l query -s e -r -d 'SQL expression to use to select from the objects'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l output-format -r -d 'output format of the result (options: json, csv)'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during selecting objects'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from csv' -f -l version-id -r -d 'use the specified version of the object'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_seen_subcommand_from select' -a 'json' -d 'run queries on json files'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l structure -r -d 'how objects are aligned in the json file, options:(lines, document)'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l compression -r -d 'input compression format (options for AWS: GZIP or BZIP2)'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l query -s e -r -d 'SQL expression to use to select from the objects'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l output-format -r -d 'output format of the result (options: json, csv)'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during selecting objects'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from json' -f -l version-id -r -d 'use the specified version of the object'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_seen_subcommand_from select' -a 'parquet' -d 'run queries on parquet files'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l query -s e -r -d 'SQL expression to use to select from the objects'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l output-format -r -d 'output format of the result (options: json, csv)'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during selecting objects'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from parquet' -f -l version-id -r -d 'use the specified version of the object'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'du' -d 'show object size usage'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l group -s g -d 'group sizes by storage class'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l humanize -s H -d 'human-readable output for object sizes'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l all-versions -d 'list all versions of object(s)'
complete -c s5cmd -n '__fish_seen_subcommand_from du' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from cat' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'cat' -d 'print remote object content'
complete -c s5cmd -n '__fish_seen_subcommand_from cat' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from cat' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from cat' -f -l concurrency -s c -r -d 'number of concurrent parts transferred between host and remote server'
complete -c s5cmd -n '__fish_seen_subcommand_from cat' -f -l part-size -s p -r -d 'size of each part transferred between host and remote server, in MiB'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'pipe' -d 'stream to remote from stdin'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l storage-class -r -d 'set storage class for target (\'STANDARD\',\'REDUCED_REDUNDANCY\',\'GLACIER\',\'STANDARD_IA\',\'ONEZONE_IA\',\'INTELLIGENT_TIERING\',\'DEEP_ARCHIVE\')'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l concurrency -s c -r -d 'number of concurrent parts transferred between host and remote server'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l part-size -s p -r -d 'size of each part transferred between host and remote server, in MiB'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l metadata -r -d 'set arbitrary metadata for the object'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l sse -r -d 'perform server side encryption of the data at its destination, e.g. aws:kms'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l sse-kms-key-id -r -d 'customer master key (CMK) id for SSE-KMS encryption; leave it out if server-side generated key is desired'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l acl -r -d 'set acl for target: defines granted accesses and their types on different accounts/groups, e.g. pipe --acl \'public-read\''
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l cache-control -r -d 'set cache control for target: defines cache control header for object, e.g. pipe --cache-control \'public, max-age=345600\''
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l expires -r -d 'set expires for target (uses RFC3339 format): defines expires header for object, e.g. pipe  --expires \'2024-10-01T20:30:00Z\''
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l content-type -r -d 'set content type for target: defines content type header for object, e.g. --content-type text/plain'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l content-encoding -r -d 'set content encoding for target: defines content encoding header for object, e.g. --content-encoding gzip'
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l content-disposition -r -d 'set content disposition for target: defines content disposition header for object, e.g. --content-disposition \'attachment; filename="filename.jpg"\''
complete -c s5cmd -n '__fish_seen_subcommand_from pipe' -f -l no-clobber -s n -d 'do not overwrite destination if already exists'
complete -c s5cmd -n '__fish_seen_subcommand_from run' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'run' -d 'run commands in batch'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'sync' -d 'sync objects'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l delete -d 'delete objects in destination but not in source'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l size-only -d 'make size of object only criteria to decide whether an object should be synced'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l exit-on-error -d 'stops the sync process if an error is received'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l no-follow-symlinks -d 'do not follow symbolic links'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l storage-class -r -d 'set storage class for target (\'STANDARD\',\'REDUCED_REDUNDANCY\',\'GLACIER\',\'STANDARD_IA\',\'ONEZONE_IA\',\'INTELLIGENT_TIERING\',\'DEEP_ARCHIVE\')'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l concurrency -s c -r -d 'number of concurrent parts transferred between host and remote server'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l part-size -s p -r -d 'size of each part transferred between host and remote server, in MiB'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l metadata -r -d 'set arbitrary metadata for the object, e.g. --metadata \'foo=bar\' --metadata \'fizz=buzz\''
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l metadata-directive -r -d 'set metadata directive for the object: COPY or REPLACE'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l sse -r -d 'perform server side encryption of the data at its destination, e.g. aws:kms'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l sse-kms-key-id -r -d 'customer master key (CMK) id for SSE-KMS encryption; leave it out if server-side generated key is desired'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l acl -r -d 'set acl for target: defines granted accesses and their types on different accounts/groups, e.g. cp --acl \'public-read\''
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l cache-control -r -d 'set cache control for target: defines cache control header for object, e.g. cp --cache-control \'public, max-age=345600\''
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l expires -r -d 'set expires for target (uses RFC3339 format): defines expires header for object, e.g. cp  --expires \'2024-10-01T20:30:00Z\''
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l force-glacier-transfer -d 'force transfer of glacier objects whether they are restored or not'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l ignore-glacier-warnings -d 'turns off glacier warnings: ignore errors encountered during copying, downloading and moving glacier objects'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l source-region -r -d 'set the region of source bucket; the region of the source bucket will be automatically discovered if --source-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l destination-region -r -d 'set the region of destination bucket: the region of the destination bucket will be automatically discovered if --destination-region is not specified'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l exclude -r -d 'exclude objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l include -r -d 'include objects with given pattern'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l content-type -r -d 'set content type for target: defines content type header for object, e.g. --content-type text/plain'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l content-encoding -r -d 'set content encoding for target: defines content encoding header for object, e.g. --content-encoding gzip'
complete -c s5cmd -n '__fish_seen_subcommand_from sync' -f -l content-disposition -r -d 'set content disposition for target: defines content disposition header for object, e.g. --content-disposition \'attachment; filename="filename.jpg"\''
complete -c s5cmd -n '__fish_seen_subcommand_from version' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'version' -d 'print version'
complete -c s5cmd -n '__fish_seen_subcommand_from bucket-version' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'bucket-version' -d 'configure bucket versioning'
complete -c s5cmd -n '__fish_seen_subcommand_from bucket-version' -f -l set -r -d 'set versioning status of bucket: (Suspended, Enabled)'
complete -c s5cmd -n '__fish_seen_subcommand_from presign' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'presign' -d 'print remote object presign url'
complete -c s5cmd -n '__fish_seen_subcommand_from presign' -f -l expire -r -d 'url valid duration'
complete -c s5cmd -n '__fish_seen_subcommand_from presign' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from head' -f -l help -s h -d 'show help'
complete -r -c s5cmd -n '__fish_s5cmd_no_subcommand' -a 'head' -d 'print remote object metadata'
complete -c s5cmd -n '__fish_seen_subcommand_from head' -f -l version-id -r -d 'use the specified version of an object'
complete -c s5cmd -n '__fish_seen_subcommand_from head' -f -l raw -d 'disable the wildcard operations, useful with filenames that contains glob characters'

you may try "writing that to the fish complete".

ps. Adding fish to existing autocompletion flag may require a trick since it needs a reference to app to prepare completion string in runtime which printAutocompletionInstructions cannot access. To avoid impacting all executions one would need to expose/delegate that call to another function wrapper and call that in printAutocompletionInstructions

	fishfn = app.ToFishCompletion