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LibLine: Allow suggestions to have trailing trivia strings

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These strings would be applied when inserted into the buffer, but are
not shown as part of the suggestion.

This commit also patches up Userland/js and Shell to use this
functionality
This commit is contained in:
AnotherTest 2020-04-19 18:32:28 +04:30 committed by Andreas Kling
parent 7ef48171ce
commit cb3cf589ed
Notes: sideshowbarker 2024-07-19 07:27:59 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/cb3cf589ed8
Pull-request: https://github.com/SerenityOS/serenity/pull/1868
4 changed files with 72 additions and 70 deletions
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31
Libraries/LibLine/Editor.cpp
View file

@ -299,17 +299,17 @@ String Editor::get_line(const String& prompt)
m_suggestions = on_tab_complete_other_token(token);
size_t common_suggestion_prefix { 0 };
if (m_suggestions.size() == 1) {
m_largest_common_suggestion_prefix_length = m_suggestions[0].length();
m_largest_common_suggestion_prefix_length = m_suggestions[0].text.length();
} else if (m_suggestions.size()) {
char last_valid_suggestion_char;
for (;; ++common_suggestion_prefix) {
if (m_suggestions[0].length() <= common_suggestion_prefix)
if (m_suggestions[0].text.length() <= common_suggestion_prefix)
goto no_more_commons;
last_valid_suggestion_char = m_suggestions[0][common_suggestion_prefix];
last_valid_suggestion_char = m_suggestions[0].text[common_suggestion_prefix];
for (const auto& suggestion : m_suggestions) {
if (suggestion.length() < common_suggestion_prefix || suggestion[common_suggestion_prefix] != last_valid_suggestion_char) {
if (suggestion.text.length() < common_suggestion_prefix || suggestion.text[common_suggestion_prefix] != last_valid_suggestion_char) {
goto no_more_commons;
}
}
@ -341,7 +341,7 @@ String Editor::get_line(const String& prompt)
auto current_suggestion_index = m_next_suggestion_index;
if (m_next_suggestion_index < m_suggestions.size()) {
auto can_complete = m_next_suggestion_invariant_offset < m_largest_common_suggestion_prefix_length;
if (!m_last_shown_suggestion.is_null()) {
if (!m_last_shown_suggestion.text.is_null()) {
size_t actual_offset;
size_t shown_length = m_last_shown_suggestion_display_length;
switch (m_times_tab_pressed) {
@ -367,17 +367,20 @@ String Editor::get_line(const String& prompt)
m_refresh_needed = true;
}
m_last_shown_suggestion = m_suggestions[m_next_suggestion_index];
m_last_shown_suggestion_display_length = m_last_shown_suggestion.length();
m_last_shown_suggestion_display_length = m_last_shown_suggestion.text.length();
m_last_shown_suggestion_was_complete = true;
if (m_times_tab_pressed == 1) {
// This is the first time, so only auto-complete *if possible*
if (can_complete) {
insert(m_last_shown_suggestion.substring_view(m_next_suggestion_invariant_offset, m_largest_common_suggestion_prefix_length - m_next_suggestion_invariant_offset));
insert(m_last_shown_suggestion.text.substring_view(m_next_suggestion_invariant_offset, m_largest_common_suggestion_prefix_length - m_next_suggestion_invariant_offset));
m_last_shown_suggestion_display_length = m_largest_common_suggestion_prefix_length;
// do not increment the suggestion index, as the first tab should only be a *peek*
if (m_suggestions.size() == 1) {
// if there's one suggestion, commit and forget
m_times_tab_pressed = 0;
// add in the trivia of the last selected suggestion
insert(m_last_shown_suggestion.trailing_trivia);
m_last_shown_suggestion_display_length += m_last_shown_suggestion.trailing_trivia.length();
}
} else {
m_last_shown_suggestion_display_length = 0;
@ -385,7 +388,9 @@ String Editor::get_line(const String& prompt)
++m_times_tab_pressed;
m_last_shown_suggestion_was_complete = false;
} else {
insert(m_last_shown_suggestion.substring_view(m_next_suggestion_invariant_offset, m_last_shown_suggestion.length() - m_next_suggestion_invariant_offset));
insert(m_last_shown_suggestion.text.substring_view(m_next_suggestion_invariant_offset, m_last_shown_suggestion.text.length() - m_next_suggestion_invariant_offset));
// add in the trivia of the last selected suggestion
insert(m_last_shown_suggestion.trailing_trivia);
if (m_tab_direction == TabDirection::Forward)
increment_suggestion_index();
else
@ -399,7 +404,7 @@ String Editor::get_line(const String& prompt)
size_t longest_suggestion_length = 0;
for (auto& suggestion : m_suggestions) {
longest_suggestion_length = max(longest_suggestion_length, suggestion.length());
longest_suggestion_length = max(longest_suggestion_length, suggestion.text.length());
}
size_t num_printed = 0;
@ -423,10 +428,10 @@ String Editor::get_line(const String& prompt)
}
vt_move_absolute(max_line_count + m_origin_x, 1);
for (auto& suggestion : m_suggestions) {
size_t next_column = num_printed + suggestion.length() + longest_suggestion_length + 2;
size_t next_column = num_printed + suggestion.text.length() + longest_suggestion_length + 2;
if (next_column > m_num_columns) {
auto lines = (suggestion.length() + m_num_columns - 1) / m_num_columns;
auto lines = (suggestion.text.length() + m_num_columns - 1) / m_num_columns;
lines_used += lines;
putchar('\n');
num_printed = 0;
@ -445,9 +450,9 @@ String Editor::get_line(const String& prompt)
if (spans_entire_line) {
num_printed += m_num_columns;
fprintf(stderr, "%s", suggestion.characters());
fprintf(stderr, "%s", suggestion.text.characters());
} else {
num_printed += fprintf(stderr, "%-*s", static_cast<int>(longest_suggestion_length) + 2, suggestion.characters());
num_printed += fprintf(stderr, "%-*s", static_cast<int>(longest_suggestion_length) + 2, suggestion.text.characters());
}
if (m_last_shown_suggestion_was_complete && index == current_suggestion_index) {

30
Libraries/LibLine/Editor.h
View file

@ -53,6 +53,28 @@ struct KeyCallback {
Function<bool(Editor&)> callback;
};
struct CompletionSuggestion {
// intentionally not explicit (allows suggesting bare strings)
CompletionSuggestion(const String& completion)
: text(completion)
, trailing_trivia("")
{
}
CompletionSuggestion(const StringView& completion, const StringView& trailing_trivia)
: text(completion)
, trailing_trivia(trailing_trivia)
{
}
bool operator==(const CompletionSuggestion& suggestion) const
{
return suggestion.text == text;
}
String text;
String trailing_trivia;
};
class Editor {
public:
Editor();
@ -79,8 +101,8 @@ public:
void register_character_input_callback(char ch, Function<bool(Editor&)> callback);
Function<Vector<String>(const String&)> on_tab_complete_first_token;
Function<Vector<String>(const String&)> on_tab_complete_other_token;
Function<Vector<CompletionSuggestion>(const String&)> on_tab_complete_first_token;
Function<Vector<CompletionSuggestion>(const String&)> on_tab_complete_other_token;
Function<void(Editor&)> on_display_refresh;
// FIXME: we will have to kindly ask our instantiators to set our signal handlers
@ -195,8 +217,8 @@ private:
size_t m_origin_y { 0 };
String m_new_prompt;
Vector<String> m_suggestions;
String m_last_shown_suggestion { String::empty() };
Vector<CompletionSuggestion> m_suggestions;
CompletionSuggestion m_last_shown_suggestion { String::empty() };
size_t m_last_shown_suggestion_display_length { 0 };
bool m_last_shown_suggestion_was_complete { false };
size_t m_next_suggestion_index { 0 };

63
Shell/main.cpp
View file

@ -1042,7 +1042,7 @@ int main(int argc, char** argv)
g.termios = editor.termios();
g.default_termios = editor.default_termios();
editor.on_tab_complete_first_token = [&](const String& token) -> Vector<String> {
editor.on_tab_complete_first_token = [&](const String& token) -> Vector<Line::CompletionSuggestion> {
auto match = binary_search(cached_path.data(), cached_path.size(), token, [](const String& token, const String& program) -> int {
return strncmp(token.characters(), program.characters(), token.length());
});
@ -1052,7 +1052,7 @@ int main(int argc, char** argv)
// Suggest local executables and directories
auto mut_token = token; // copy it :(
String path;
Vector<String> local_suggestions;
Vector<Line::CompletionSuggestion> local_suggestions;
bool suggest_executables = true;
ssize_t last_slash = token.length() - 1;
@ -1090,6 +1090,7 @@ int main(int argc, char** argv)
// manually skip `.' and `..'
if (file == "." || file == "..")
continue;
auto trivia = " ";
if (file.starts_with(mut_token)) {
String file_path = String::format("%s/%s", path.characters(), file.characters());
struct stat program_status;
@ -1098,25 +1099,14 @@ int main(int argc, char** argv)
continue;
if (!(program_status.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
continue;
if (!S_ISDIR(program_status.st_mode) && !suggest_executables)
if (S_ISDIR(program_status.st_mode)) {
if (suggest_executables)
continue;
local_suggestions.append(file);
}
else
trivia = "/";
}
// If we have a single match and it's a directory, we add a slash. If it's
// a regular file, we add a space, unless we already have one.
if (local_suggestions.size() == 1) {
auto& completion = local_suggestions[0];
String file_path = String::format("%s/%s", path.characters(), completion.characters());
struct stat program_status;
int stat_error = stat(file_path.characters(), &program_status);
if (!stat_error) {
if (S_ISDIR(program_status.st_mode))
completion = String::format("%s/", local_suggestions[0].characters());
else if (editor.cursor() == editor.buffer().size() || editor.buffer_at(editor.cursor()) != ' ')
completion = String::format("%s ", local_suggestions[0].characters());
local_suggestions.append({ file, trivia });
}
}
@ -1124,37 +1114,29 @@ int main(int argc, char** argv)
}
String completion = *match;
Vector<String> suggestions;
Vector<Line::CompletionSuggestion> suggestions;
// Now that we have a program name starting with our token, we look at
// other program names starting with our token and cut off any mismatching
// characters.
bool seen_others = false;
int index = match - cached_path.data();
for (int i = index - 1; i >= 0 && cached_path[i].starts_with(token); --i) {
suggestions.append(cached_path[i]);
seen_others = true;
suggestions.append({ cached_path[i], " " });
}
for (size_t i = index + 1; i < cached_path.size() && cached_path[i].starts_with(token); ++i) {
suggestions.append(cached_path[i]);
seen_others = true;
}
suggestions.append(cached_path[index]);
// If we have a single match, we add a space, unless we already have one.
if (!seen_others && (editor.cursor() == editor.buffer().size() || editor.buffer_at(editor.cursor()) != ' ')) {
suggestions[0] = String::format("%s ", suggestions[0].characters());
suggestions.append({ cached_path[i], " " });
}
suggestions.append({ cached_path[index], " " });
editor.suggest(token.length(), 0);
return suggestions;
};
editor.on_tab_complete_other_token = [&](const String& vtoken) -> Vector<String> {
editor.on_tab_complete_other_token = [&](const String& vtoken) -> Vector<Line::CompletionSuggestion> {
auto token = vtoken; // copy it :(
String path;
Vector<String> suggestions;
Vector<Line::CompletionSuggestion> suggestions;
ssize_t last_slash = token.length() - 1;
while (last_slash >= 0 && token[last_slash] != '/')
@ -1190,22 +1172,15 @@ int main(int argc, char** argv)
if (file == "." || file == "..")
continue;
if (file.starts_with(token)) {
suggestions.append(file);
}
}
// If we have a single match and it's a directory, we add a slash. If it's
// a regular file, we add a space, unless we already have one.
if (suggestions.size() == 1) {
auto& completion = suggestions[0];
String file_path = String::format("%s/%s", path.characters(), completion.characters());
struct stat program_status;
String file_path = String::format("%s/%s", path.characters(), file.characters());
int stat_error = stat(file_path.characters(), &program_status);
if (!stat_error) {
if (S_ISDIR(program_status.st_mode))
completion = String::format("%s/", suggestions[0].characters());
else if (editor.cursor() == editor.buffer().size() || editor.buffer_at(editor.cursor()) != ' ')
completion = String::format("%s ", suggestions[0].characters());
suggestions.append({ file, "/" });
else
suggestions.append({ file, " " });
}
}
}

6
Userland/js.cpp
View file

@ -553,7 +553,7 @@ int main(int argc, char** argv)
editor.set_prompt(prompt_for_level(open_indents));
};
auto complete = [&interpreter, &editor = *editor](const String& token) -> Vector<String> {
auto complete = [&interpreter, &editor = *editor](const String& token) -> Vector<Line::CompletionSuggestion> {
if (token.length() == 0)
return {}; // nyeh
@ -564,13 +564,13 @@ int main(int argc, char** argv)
// - <N>.<P>
// where N is the complete name of a variable and
// P is part of the name of one of its properties
Vector<String> results;
Vector<Line::CompletionSuggestion> results;
Function<void(const JS::Shape&, const StringView&)> list_all_properties = [&results, &list_all_properties](const JS::Shape& shape, auto& property_pattern) {
for (const auto& descriptor : shape.property_table()) {
if (descriptor.value.attributes & JS::Attribute::Enumerable) {
if (descriptor.key.view().starts_with(property_pattern)) {
auto completion = descriptor.key;
Line::CompletionSuggestion completion { descriptor.key };
if (!results.contains_slow(completion)) { // hide duplicates
results.append(completion);
}