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Shell: Implement program-aware autocompletion

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A program can either respond to `--complete -- some args to complete`
directly, or add a `_complete_<program name>` invokable (i.e. shell
function, or just a plain binary in PATH) that completes the given
command and lists the completions on stdout.
Should such a completion fail or yield no results, we'll fall back to
the previous completion algorithm.
This commit is contained in:
Ali Mohammad Pur 2022-03-23 01:14:48 +04:30 • committed by Ali Mohammad Pur
parent fc4d36ccd0
commit 7e4cc187d9
5 changed files with 315 additions and 47 deletions
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6
Userland/Shell/AST.h
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@ -217,6 +217,7 @@ struct HitTestResult {
class Value : public RefCounted<Value> {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) = 0;
virtual String resolve_as_string(RefPtr<Shell> shell);
virtual Vector<Command> resolve_as_commands(RefPtr<Shell>);
virtual NonnullRefPtr<Value> resolve_without_cast(RefPtr<Shell>) { return *this; }
virtual NonnullRefPtr<Value> clone() const = 0;
@ -279,6 +280,7 @@ private:
class JobValue final : public Value {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) override { VERIFY_NOT_REACHED(); }
virtual String resolve_as_string(RefPtr<Shell>) override { return String::formatted("%{}", m_job->job_id()); }
virtual Vector<Command> resolve_as_commands(RefPtr<Shell>) override { VERIFY_NOT_REACHED(); }
virtual NonnullRefPtr<Value> clone() const override { return make_ref_counted<JobValue>(m_job)->set_slices(m_slices); }
virtual ~JobValue();
@ -322,6 +324,7 @@ private:
class StringValue final : public Value {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) override;
virtual String resolve_as_string(RefPtr<Shell> shell) override;
virtual NonnullRefPtr<Value> clone() const override { return make_ref_counted<StringValue>(m_string, m_split, m_keep_empty)->set_slices(m_slices); }
virtual ~StringValue();
virtual bool is_string() const override { return m_split.is_null(); }
@ -360,6 +363,7 @@ private:
class SimpleVariableValue final : public Value {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) override;
virtual String resolve_as_string(RefPtr<Shell>) override;
virtual NonnullRefPtr<Value> resolve_without_cast(RefPtr<Shell>) override;
virtual NonnullRefPtr<Value> clone() const override { return make_ref_counted<SimpleVariableValue>(m_name)->set_slices(m_slices); }
virtual ~SimpleVariableValue();
@ -375,6 +379,7 @@ private:
class SpecialVariableValue final : public Value {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) override;
virtual String resolve_as_string(RefPtr<Shell>) override;
virtual NonnullRefPtr<Value> clone() const override { return make_ref_counted<SpecialVariableValue>(m_name)->set_slices(m_slices); }
virtual ~SpecialVariableValue();
SpecialVariableValue(char name)
@ -389,6 +394,7 @@ private:
class TildeValue final : public Value {
public:
virtual Vector<String> resolve_as_list(RefPtr<Shell>) override;
virtual String resolve_as_string(RefPtr<Shell>) override;
virtual NonnullRefPtr<Value> clone() const override { return make_ref_counted<TildeValue>(m_username)->set_slices(m_slices); }
virtual ~TildeValue();
virtual bool is_string() const override { return true; }