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