fish_clipboard_paste: don't bypass pager search field.

To do so add an ad-hoc "commandline --search-field" to operate on pager
search field.

This is primarily motivated because a following commit reuses the
fish_clipboard_paste logic for bracketed paste. This avoids a regression.

doc_src/cmds/commandline.rst

@@ -70,6 +70,9 @@ The following options change what part of the commandline is printed or updated:
 **-t** or **--current-token**
     Selects the current token
 
+**--search-field**
+    Use the pager search field instead of the command line. Returns false is the search field is not shown.
+
 The following options change the way ``commandline`` prints the current commandline buffer:
 
 **-c** or **--cut-at-cursor**

share/completions/commandline.fish

@@ -22,6 +22,7 @@ complete -c commandline -s L -l line -d "Print the line that the cursor is on"
 complete -c commandline -s S -l search-mode -d "Return true if performing a history search"
 complete -c commandline -s P -l paging-mode -d "Return true if showing pager content"
 complete -c commandline -l paging-full-mode -d "Return true if pager is showing all content"
+complete -c commandline -l search-field -d "Operate on the pager search field"
 complete -c commandline -l is-valid -d "Return true if the command line is syntactically valid and complete"
 
 complete -c commandline -n '__fish_contains_opt -s f function' -a '(bind --function-names)' -d 'Function name' -x

share/functions/fish_clipboard_paste.fish

@@ -26,6 +26,11 @@ function fish_clipboard_paste
     # Also split on \r, otherwise it looks confusing
     set data (string split \r -- $data | string split \n)
 
+    if commandline --search-field >/dev/null
+        commandline --search-field -i -- $data
+        return
+    end
+
     # If the current token has an unmatched single-quote,
     # escape all single-quotes (and backslashes) in the paste,
     # in order to turn it into a single literal token.

src/builtins/commandline.rs

@@ -11,7 +11,9 @@ use crate::parse_util::{
     parse_util_token_extent,
 };
 use crate::proc::is_interactive_session;
-use crate::reader::{commandline_get_state, commandline_set_buffer, reader_queue_ch};
+use crate::reader::{
+    commandline_get_state, commandline_set_buffer, commandline_set_search_field, reader_queue_ch,
+};
 use crate::tokenizer::TOK_ACCEPT_UNFINISHED;
 use crate::tokenizer::{TokenType, Tokenizer};
 use crate::wchar::prelude::*;
@@ -57,6 +59,7 @@ fn replace_part(
     insert_mode: AppendMode,
     buff: &wstr,
     cursor_pos: usize,
+    search_field_mode: bool,
 ) {
     let mut out_pos = cursor_pos;
     let mut out = buff[..range.start].to_owned();
@@ -81,7 +84,11 @@ fn replace_part(
     }
 
     out.push_utfstr(&buff[range.end..]);
+    if search_field_mode {
+        commandline_set_search_field(out, Some(out_pos));
+    } else {
         commandline_set_buffer(out, Some(out_pos));
+    }
 }
 
 /// Output the specified selection.
@@ -191,6 +198,7 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
     let mut search_mode = false;
     let mut paging_mode = false;
     let mut paging_full_mode = false;
+    let mut search_field_mode = false;
     let mut is_valid = false;
 
     let mut range = 0..0;
@@ -224,6 +232,7 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
         wopt(L!("search-mode"), woption_argument_t::no_argument, 'S'),
         wopt(L!("paging-mode"), woption_argument_t::no_argument, 'P'),
         wopt(L!("paging-full-mode"), woption_argument_t::no_argument, 'F'),
+        wopt(L!("search-field"), woption_argument_t::no_argument, '\x03'),
         wopt(L!("is-valid"), woption_argument_t::no_argument, '\x01'),
     ];
 
@@ -269,6 +278,7 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
             's' => selection_mode = true,
             'P' => paging_mode = true,
             'F' => paging_full_mode = true,
+            '\x03' => search_field_mode = true,
             '\x01' => is_valid = true,
             'h' => {
                 builtin_print_help(parser, streams, cmd);
@@ -361,10 +371,10 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
         return STATUS_INVALID_ARGS;
     }
 
-    if (buffer_part.is_some() || token_mode.is_some() || cut_at_cursor)
+    if (buffer_part.is_some() || token_mode.is_some() || cut_at_cursor || search_field_mode)
         && (cursor_mode || line_mode || search_mode || paging_mode || paging_full_mode)
         // Special case - we allow to get/set cursor position relative to the process/job/token.
-        && (buffer_part.is_none() || !cursor_mode)
+        && ((buffer_part.is_none() && !search_field_mode) || !cursor_mode)
     {
         streams.err.append(wgettext_fmt!(BUILTIN_ERR_COMBO, cmd));
         builtin_print_error_trailer(parser, streams.err, cmd);
@@ -381,6 +391,12 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
         return STATUS_INVALID_ARGS;
     }
 
+    if search_field_mode && buffer_part.is_some() {
+        streams.err.append(wgettext_fmt!(BUILTIN_ERR_COMBO, cmd,));
+        builtin_print_error_trailer(parser, streams.err, cmd);
+        return STATUS_INVALID_ARGS;
+    }
+
     if append_mode.is_some() && positional_args == 0 {
         // No tokens in insert mode just means we do nothing.
         return STATUS_CMD_ERROR;
@@ -447,7 +463,15 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
     let current_buffer;
     let current_cursor_pos;
     let transient;
-    if let Some(override_buffer) = &override_buffer {
+
+    if search_field_mode {
+        let Some((search_field_text, cursor_pos)) = commandline_get_state().search_field else {
+            return STATUS_CMD_ERROR;
+        };
+        transient = search_field_text;
+        current_buffer = &transient;
+        current_cursor_pos = cursor_pos;
+    } else if let Some(override_buffer) = &override_buffer {
         current_buffer = override_buffer;
         current_cursor_pos = current_buffer.len();
     } else if !ld.transient_commandlines.is_empty() && !cursor_mode {
@@ -487,6 +511,9 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
         };
     }
 
+    if search_field_mode {
+        range = 0..current_buffer.len();
+    } else {
         match buffer_part {
             TextScope::String => {
                 range = 0..current_buffer.len();
@@ -501,6 +528,7 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
                 parse_util_token_extent(current_buffer, current_cursor_pos, &mut range, None);
             }
         }
+    }
 
     if cursor_mode {
         if positional_args != 0 {
@@ -546,10 +574,18 @@ pub fn commandline(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr])
             append_mode,
             current_buffer,
             current_cursor_pos,
+            search_field_mode,
         );
     } else {
         let sb = join_strings(&w.argv[w.woptind..], '\n');
-        replace_part(range, &sb, append_mode, current_buffer, current_cursor_pos);
+        replace_part(
+            range,
+            &sb,
+            append_mode,
+            current_buffer,
+            current_cursor_pos,
+            search_field_mode,
+        );
     }
 
     STATUS_CMD_OK

src/reader.rs

@@ -21,6 +21,7 @@ use nix::fcntl::OFlag;
 use nix::sys::stat::Mode;
 use once_cell::sync::Lazy;
 use std::cell::UnsafeCell;
+use std::cmp;
 use std::io::BufReader;
 use std::num::NonZeroUsize;
 use std::ops::Range;
@@ -305,6 +306,8 @@ pub struct CommandlineState {
     pub pager_mode: bool,
     /// pager already shows everything if possible
     pub pager_fully_disclosed: bool,
+    /// The search field, if shown.
+    pub search_field: Option<(WString, usize)>,
     /// pager is visible and search is active
     pub search_mode: bool,
     /// if false, the reader has not yet been entered
@@ -320,6 +323,7 @@ impl CommandlineState {
             history: None,
             pager_mode: false,
             pager_fully_disclosed: false,
+            search_field: None,
             search_mode: false,
             initialized: false,
         }
@@ -937,10 +941,17 @@ pub fn commandline_get_state() -> CommandlineState {
 /// will pick it up when it is done executing.
 pub fn commandline_set_buffer(text: WString, cursor_pos: Option<usize>) {
     let mut state = commandline_state_snapshot();
-    state.cursor_pos = std::cmp::min(cursor_pos.unwrap_or(usize::MAX), text.len());
+    state.cursor_pos = cmp::min(cursor_pos.unwrap_or(usize::MAX), text.len());
     state.text = text;
 }
 
+pub fn commandline_set_search_field(text: WString, cursor_pos: Option<usize>) {
+    let mut state = commandline_state_snapshot();
+    assert!(state.search_field.is_some());
+    let new_pos = cmp::min(cursor_pos.unwrap_or(usize::MAX), text.len());
+    state.search_field = Some((text, new_pos));
+}
+
 /// Return the current interactive reads loop count. Useful for determining how many commands have
 /// been executed between invocations of code.
 pub fn reader_run_count() -> u64 {
@@ -1163,6 +1174,12 @@ impl ReaderData {
         snapshot.selection = self.get_selection();
         snapshot.pager_mode = !self.pager.is_empty();
         snapshot.pager_fully_disclosed = self.current_page_rendering.remaining_to_disclose == 0;
+        snapshot.search_field = self.pager.search_field_shown.then(|| {
+            (
+                self.pager.search_field_line.text().to_owned(),
+                self.pager.search_field_line.position(),
+            )
+        });
         snapshot.search_mode = self.history_search.active();
         snapshot.initialized = true;
     }
@@ -1179,6 +1196,20 @@ impl ReaderData {
             self.clear_pager();
             self.set_buffer_maintaining_pager(&state.text, state.cursor_pos, false);
             self.reset_loop_state = true;
+        } else if let Some((new_search_field, new_cursor_pos)) = state.search_field {
+            if !self.pager.search_field_shown {
+                return; // Not yet supported.
+            }
+            if new_search_field == self.pager.search_field_line.text()
+                && new_cursor_pos == self.pager.search_field_line.position()
+            {
+                return;
+            }
+            self.push_edit(
+                EditableLineTag::SearchField,
+                Edit::new(0..self.pager.search_field_line.len(), new_search_field),
+            );
+            self.pager.search_field_line.set_position(new_cursor_pos);
         }
     }