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# shellcheck shell=bash
# Setup hook for the `installShellFiles` package.
#
# Example usage in a derivation:
#
# { …, installShellFiles, … }:
# stdenv.mkDerivation {
# …
# nativeBuildInputs = [ installShellFiles ];
# postInstall = ''
# installManPage share/doc/foobar.1
# installShellCompletion share/completions/foobar.{bash,fish,zsh}
# '';
# …
# }
#
# See comments on each function for more details.
# installManPage <path> [...<path>]
#
# Each argument is checked for its man section suffix and installed into the appropriate
# share/man/man<n>/ directory. The function returns an error if any paths don't have the man
# section suffix (with optional .gz compression).
installManPage() {
local path
for path in "$@"; do
if (( "${NIX_DEBUG:-0}" >= 1 )); then
echo "installManPage: installing $path"
fi
if test -z "$path"; then
echo "installManPage: error: path cannot be empty" >&2
return 1
fi
local basename
basename=$(stripHash "$path") # use stripHash in case it's a nix store path
local trimmed=${basename%.gz} # don't get fooled by compressed manpages
local suffix=${trimmed##*.}
if test -z "$suffix" -o "$suffix" = "$trimmed"; then
echo "installManPage: error: path missing manpage section suffix: $path" >&2
return 1
fi
local outRoot
if test "$suffix" = 3; then
outRoot=${!outputDevman:?}
else
outRoot=${!outputMan:?}
fi
install -Dm644 -T "$path" "${outRoot}/share/man/man$suffix/$basename" || return
done
}
# installShellCompletion [--cmd <name>] ([--bash|--fish|--zsh] [--name <name>] <path>)...
#
# Each path is installed into the appropriate directory for shell completions for the given shell.
# If one of `--bash`, `--fish`, or `--zsh` is given the path is assumed to belong to that shell.
# Otherwise the file extension will be examined to pick a shell. If the shell is unknown a warning
# will be logged and the command will return a non-zero status code after processing any remaining
# paths. Any of the shell flags will affect all subsequent paths (unless another shell flag is
# given).
#
# If the shell completion needs to be renamed before installing the optional `--name <name>` flag
# may be given. Any name provided with this flag only applies to the next path.
#
# If all shell completions need to be renamed before installing the optional `--cmd <name>` flag
# may be given. This will synthesize a name for each file, unless overridden with an explicit
# `--name` flag. For example, `--cmd foobar` will synthesize the name `_foobar` for zsh and
# `foobar.bash` for bash.
#
# For zsh completions, if the `--name` flag is not given, the path will be automatically renamed
# such that `foobar.zsh` becomes `_foobar`.
#
# A path may be a named fd, such as produced by the bash construct `<(cmd)`. When using a named fd,
# the shell type flag must be provided, and either the `--name` or `--cmd` flag must be provided.
# This might look something like:
#
# installShellCompletion --zsh --name _foobar <($out/bin/foobar --zsh-completion)
#
# This command accepts multiple shell flags in conjunction with multiple paths if you wish to
# install them all in one command:
#
# installShellCompletion share/completions/foobar.{bash,fish} --zsh share/completions/_foobar
#
# However it may be easier to read if each shell is split into its own invocation, especially when
# renaming is involved:
#
# installShellCompletion --bash --name foobar.bash share/completions.bash
# installShellCompletion --fish --name foobar.fish share/completions.fish
# installShellCompletion --zsh --name _foobar share/completions.zsh
#
# Or to use shell newline escaping to split a single invocation across multiple lines:
#
# installShellCompletion --cmd foobar \
# --bash <($out/bin/foobar --bash-completion) \
# --fish <($out/bin/foobar --fish-completion) \
# --zsh <($out/bin/foobar --zsh-completion)
#
# If any argument is `--` the remaining arguments will be treated as paths.
installShellCompletion() {
local shell='' name='' cmdname='' retval=0 parseArgs=1 arg
while { arg=$1; shift; }; do
# Parse arguments
if (( parseArgs )); then
case "$arg" in
--bash|--fish|--zsh)
shell=${arg#--}
continue;;
--name)
name=$1
shift || {
echo 'installShellCompletion: error: --name flag expected an argument' >&2
return 1
}
continue;;
--name=*)
# treat `--name=foo` the same as `--name foo`
name=${arg#--name=}
continue;;
--cmd)
cmdname=$1
shift || {
echo 'installShellCompletion: error: --cmd flag expected an argument' >&2
return 1
}
continue;;
--cmd=*)
# treat `--cmd=foo` the same as `--cmd foo`
cmdname=${arg#--cmd=}
continue;;
--?*)
echo "installShellCompletion: warning: unknown flag ${arg%%=*}" >&2
retval=2
continue;;
--)
# treat remaining args as paths
parseArgs=0
continue;;
esac
fi
if (( "${NIX_DEBUG:-0}" >= 1 )); then
echo "installShellCompletion: installing $arg${name:+ as $name}"
fi
# if we get here, this is a path or named pipe
# Identify shell and output name
local curShell=$shell
local outName=''
if [[ -z "$arg" ]]; then
echo "installShellCompletion: error: empty path is not allowed" >&2
return 1
elif [[ -p "$arg" ]]; then
# this is a named fd or fifo
if [[ -z "$curShell" ]]; then
echo "installShellCompletion: error: named pipe requires one of --bash, --fish, or --zsh" >&2
return 1
elif [[ -z "$name" && -z "$cmdname" ]]; then
echo "installShellCompletion: error: named pipe requires one of --cmd or --name" >&2
return 1
fi
else
# this is a path
local argbase
argbase=$(stripHash "$arg")
if [[ -z "$curShell" ]]; then
# auto-detect the shell
case "$argbase" in
?*.bash) curShell=bash;;
?*.fish) curShell=fish;;
?*.zsh) curShell=zsh;;
*)
if [[ "$argbase" = _* && "$argbase" != *.* ]]; then
# probably zsh
echo "installShellCompletion: warning: assuming path \`$arg' is zsh; please specify with --zsh" >&2
curShell=zsh
else
echo "installShellCompletion: warning: unknown shell for path: $arg" >&2
retval=2
continue
fi;;
esac
fi
outName=$argbase
fi
# Identify output path
if [[ -n "$name" ]]; then
outName=$name
elif [[ -n "$cmdname" ]]; then
case "$curShell" in
bash|fish) outName=$cmdname.$curShell;;
zsh) outName=_$cmdname;;
*)
# Our list of shells is out of sync with the flags we accept or extensions we detect.
echo 'installShellCompletion: internal error' >&2
return 1;;
esac
fi
local sharePath
case "$curShell" in
bash) sharePath=bash-completion/completions;;
fish) sharePath=fish/vendor_completions.d;;
zsh)
sharePath=zsh/site-functions
# only apply automatic renaming if we didn't have a manual rename
if [[ -z "$name" && -z "$cmdname" ]]; then
# convert a name like `foo.zsh` into `_foo`
outName=${outName%.zsh}
outName=_${outName#_}
fi;;
*)
# Our list of shells is out of sync with the flags we accept or extensions we detect.
echo 'installShellCompletion: internal error' >&2
return 1;;
esac
# Install file
local outDir="${!outputBin:?}/share/$sharePath"
local outPath="$outDir/$outName"
if [[ -p "$arg" ]]; then
# install handles named pipes on NixOS but not on macOS
mkdir -p "$outDir" \
&& cat "$arg" > "$outPath"
else
install -Dm644 -T "$arg" "$outPath"
fi || return
# Clear the per-path flags
name=
done
if [[ -n "$name" ]]; then
echo 'installShellCompletion: error: --name flag given with no path' >&2
return 1
fi
return $retval
}
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