terminal: move line searching here, unit test

src/Surface.zig

@@ -20,6 +20,7 @@ const builtin = @import("builtin");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
 const ArenaAllocator = std.heap.ArenaAllocator;
+const oni = @import("oniguruma");
 const ziglyph = @import("ziglyph");
 const main = @import("main.zig");
 const renderer = @import("renderer.zig");
@@ -165,12 +166,38 @@ const DerivedConfig = struct {
     window_padding_y: u32,
     window_padding_balance: bool,
     title: ?[:0]const u8,
+    links: []const Link,
+
+    const Link = struct {
+        regex: oni.Regex,
+        action: input.Link.Action,
+    };
 
     pub fn init(alloc_gpa: Allocator, config: *const configpkg.Config) !DerivedConfig {
         var arena = ArenaAllocator.init(alloc_gpa);
         errdefer arena.deinit();
         const alloc = arena.allocator();
 
+        // Build all of our links
+        const links = links: {
+            var links = std.ArrayList(Link).init(alloc);
+            defer links.deinit();
+            for (config.link.links.items) |link| {
+                var regex = try link.oniRegex();
+                errdefer regex.deinit();
+                try links.append(.{
+                    .regex = regex,
+                    .action = link.action,
+                });
+            }
+
+            break :links try links.toOwnedSlice();
+        };
+        errdefer {
+            for (links) |*link| link.regex.deinit();
+            alloc.free(links);
+        }
+
         return .{
             .original_font_size = config.@"font-size",
             .keybind = try config.keybind.clone(alloc),
@@ -192,6 +219,7 @@ const DerivedConfig = struct {
             .window_padding_y = config.@"window-padding-y",
             .window_padding_balance = config.@"window-padding-balance",
             .title = config.title,
+            .links = links,
 
             // Assignments happen sequentially so we have to do this last
             // so that the memory is captured from allocs above.
@@ -1842,6 +1870,14 @@ pub fn mouseButtonCallback(
         }
     }
 
+    // Handle link clicking. We want to do this before we do mouse
+    // reporting or any other mouse handling because a successfully
+    // clicked link will swallow the event.
+    if (button == .left and action == .release) {
+        const pos = try self.rt_surface.getCursorPos();
+        if (try self.processLinks(pos)) return;
+    }
+
     // Report mouse events if enabled
     {
         self.renderer_state.mutex.lock();
@@ -1970,6 +2006,28 @@ pub fn mouseButtonCallback(
     }
 }
 
+/// Attempt to invoke the action of any link that is under the
+/// given position.
+fn processLinks(self: *Surface, pos: apprt.CursorPos) !bool {
+    // If we have no configured links we can save a lot of work
+    if (self.config.links.len == 0) return false;
+
+    // Convert our cursor position to a screen point.
+    const screen_point = screen_point: {
+        const viewport_point = self.posToViewport(pos.x, pos.y);
+        break :screen_point viewport_point.toScreen(&self.io.terminal.screen);
+    };
+
+    // Get the line we're hovering over.
+    const line = self.io.terminal.screen.getLine(screen_point) orelse
+        return false;
+    const strmap = try line.stringMap(self.alloc);
+    defer strmap.deinit(self.alloc);
+
+    // TODO
+    return false;
+}
+
 pub fn cursorPosCallback(
     self: *Surface,
     pos: apprt.CursorPos,
@@ -2016,36 +2074,38 @@ pub fn cursorPosCallback(
         return;
     }
 
-    // If the cursor isn't clicked currently, it doesn't matter
-    if (self.mouse.click_state[@intFromEnum(input.MouseButton.left)] != .press) return;
+    // Handle cursor position for text selection
+    if (self.mouse.click_state[@intFromEnum(input.MouseButton.left)] == .press) {
+        // All roads lead to requiring a re-render at this point.
+        try self.queueRender();
 
-    // All roads lead to requiring a re-render at this point.
-    try self.queueRender();
+        // If our y is negative, we're above the window. In this case, we scroll
+        // up. The amount we scroll up is dependent on how negative we are.
+        // Note: one day, we can change this from distance to time based if we want.
+        //log.warn("CURSOR POS: {} {}", .{ pos, self.screen_size });
+        const max_y: f32 = @floatFromInt(self.screen_size.height);
+        if (pos.y < 0 or pos.y > max_y) {
+            const delta: isize = if (pos.y < 0) -1 else 1;
+            try self.io.terminal.scrollViewport(.{ .delta = delta });
 
-    // If our y is negative, we're above the window. In this case, we scroll
-    // up. The amount we scroll up is dependent on how negative we are.
-    // Note: one day, we can change this from distance to time based if we want.
-    //log.warn("CURSOR POS: {} {}", .{ pos, self.screen_size });
-    const max_y: f32 = @floatFromInt(self.screen_size.height);
-    if (pos.y < 0 or pos.y > max_y) {
-        const delta: isize = if (pos.y < 0) -1 else 1;
-        try self.io.terminal.scrollViewport(.{ .delta = delta });
+            // TODO: We want a timer or something to repeat while we're still
+            // at this cursor position. Right now, the user has to jiggle their
+            // mouse in order to scroll.
+        }
 
-        // TODO: We want a timer or something to repeat while we're still
-        // at this cursor position. Right now, the user has to jiggle their
-        // mouse in order to scroll.
-    }
+        // Convert to points
+        const viewport_point = self.posToViewport(pos.x, pos.y);
+        const screen_point = viewport_point.toScreen(&self.io.terminal.screen);
 
-    // Convert to points
-    const viewport_point = self.posToViewport(pos.x, pos.y);
-    const screen_point = viewport_point.toScreen(&self.io.terminal.screen);
+        // Handle dragging depending on click count
+        switch (self.mouse.left_click_count) {
+            1 => self.dragLeftClickSingle(screen_point, pos.x),
+            2 => self.dragLeftClickDouble(screen_point),
+            3 => self.dragLeftClickTriple(screen_point),
+            else => unreachable,
+        }
 
-    // Handle dragging depending on click count
-    switch (self.mouse.left_click_count) {
-        1 => self.dragLeftClickSingle(screen_point, pos.x),
-        2 => self.dragLeftClickDouble(screen_point),
-        3 => self.dragLeftClickTriple(screen_point),
-        else => unreachable,
+        return;
     }
 }
 

src/renderer/Metal.zig

@@ -1408,29 +1408,17 @@ fn rebuildCells(
         const strmap = line.stringMap(arena_alloc) catch continue;
         defer strmap.deinit(arena_alloc);
 
-        var offset: usize = 0;
+        var it = strmap.searchIterator(self.url_regex);
         while (true) {
-            var match = self.url_regex.search(strmap.string[offset..], .{}) catch |err| {
-                switch (err) {
-                    error.Mismatch => {},
-                    else => log.warn("failed to search for URLs err={}", .{err}),
-                }
-
+            const match_ = it.next() catch |err| {
+                log.warn("failed to search for URLs err={}", .{err});
                 break;
             };
+            var match = match_ orelse break;
             defer match.deinit();
 
-            // Determine the screen point for the match
-            const start_idx: usize = @intCast(match.starts()[0]);
-            const end_idx: usize = @intCast(match.ends()[0] - 1);
-            const start_pt = strmap.map[offset + start_idx];
-            const end_pt = strmap.map[offset + end_idx];
-
-            // Move our offset so we can continue searching
-            offset += end_idx;
-
             // Store our selection
-            try urls.append(.{ .start = start_pt, .end = end_pt });
+            try urls.append(match.selection());
         }
     }
 

src/terminal/Screen.zig

@@ -67,6 +67,7 @@ const kitty = @import("kitty.zig");
 const point = @import("point.zig");
 const CircBuf = @import("../circ_buf.zig").CircBuf;
 const Selection = @import("Selection.zig");
+const StringMap = @import("StringMap.zig");
 const fastmem = @import("../fastmem.zig");
 const charsets = @import("charsets.zig");
 
@@ -2228,18 +2229,6 @@ pub fn selectionString(
     return string;
 }
 
-/// A string along with the mapping of each individual byte in the string
-/// to the point in the screen.
-pub const StringMap = struct {
-    string: [:0]const u8,
-    map: []point.ScreenPoint,
-
-    pub fn deinit(self: StringMap, alloc: Allocator) void {
-        alloc.free(self.string);
-        alloc.free(self.map);
-    }
-};
-
 /// Returns the row text associated with a selection along with the
 /// mapping of each individual byte in the string to the point in the screen.
 fn selectionStringMap(

src/terminal/StringMap.zig

@@ -0,0 +1,124 @@
+/// A string along with the mapping of each individual byte in the string
+/// to the point in the screen.
+const StringMap = @This();
+
+const std = @import("std");
+const oni = @import("oniguruma");
+const point = @import("point.zig");
+const Selection = @import("Selection.zig");
+const Screen = @import("Screen.zig");
+const Allocator = std.mem.Allocator;
+
+string: [:0]const u8,
+map: []point.ScreenPoint,
+
+pub fn deinit(self: StringMap, alloc: Allocator) void {
+    alloc.free(self.string);
+    alloc.free(self.map);
+}
+
+/// Returns an iterator that yields the next match of the given regex.
+pub fn searchIterator(
+    self: StringMap,
+    regex: oni.Regex,
+) SearchIterator {
+    return .{ .map = self, .regex = regex };
+}
+
+/// Iterates over the regular expression matches of the string.
+pub const SearchIterator = struct {
+    map: StringMap,
+    regex: oni.Regex,
+    offset: usize = 0,
+
+    /// Returns the next regular expression match or null if there are
+    /// no more matches.
+    pub fn next(self: *SearchIterator) !?Match {
+        if (self.offset >= self.map.string.len) return null;
+
+        var region = self.regex.search(
+            self.map.string[self.offset..],
+            .{},
+        ) catch |err| switch (err) {
+            error.Mismatch => {
+                self.offset = self.map.string.len;
+                return null;
+            },
+
+            else => return err,
+        };
+        errdefer region.deinit();
+
+        // Increment our offset by the number of bytes in the match.
+        // We defer this so that we can return the match before
+        // modifying the offset.
+        const end_idx: usize = @intCast(region.ends()[0]);
+        defer self.offset += end_idx;
+
+        return .{
+            .map = self.map,
+            .offset = self.offset,
+            .region = region,
+        };
+    }
+};
+
+/// A single regular expression match.
+pub const Match = struct {
+    map: StringMap,
+    offset: usize,
+    region: oni.Region,
+
+    pub fn deinit(self: *Match) void {
+        self.region.deinit();
+    }
+
+    /// Returns the selection containing the full match.
+    pub fn selection(self: Match) Selection {
+        const start_idx: usize = @intCast(self.region.starts()[0]);
+        const end_idx: usize = @intCast(self.region.ends()[0] - 1);
+        const start_pt = self.map.map[self.offset + start_idx];
+        const end_pt = self.map.map[self.offset + end_idx];
+        return .{ .start = start_pt, .end = end_pt };
+    }
+};
+
+test "searchIterator" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    // Initialize our regex
+    try oni.testing.ensureInit();
+    var re = try oni.Regex.init(
+        "[A-B]{2}",
+        .{},
+        oni.Encoding.utf8,
+        oni.Syntax.default,
+        null,
+    );
+    defer re.deinit();
+
+    // Initialize our screen
+    var s = try Screen.init(alloc, 5, 5, 0);
+    defer s.deinit();
+    const str = "1ABCD2EFGH\n3IJKL";
+    try s.testWriteString(str);
+    const line = s.getLine(.{ .x = 2, .y = 1 }).?;
+    const map = try line.stringMap(alloc);
+    defer map.deinit(alloc);
+
+    // Get our iterator
+    var it = map.searchIterator(re);
+    {
+        var match = (try it.next()).?;
+        defer match.deinit();
+
+        const sel = match.selection();
+        try testing.expectEqual(Selection{
+            .start = .{ .x = 1, .y = 0 },
+            .end = .{ .x = 2, .y = 0 },
+        }, sel);
+    }
+
+    try testing.expect(try it.next() == null);
+}

src/terminal/main.zig

@@ -26,6 +26,7 @@ pub const Terminal = @import("Terminal.zig");
 pub const Parser = @import("Parser.zig");
 pub const Selection = @import("Selection.zig");
 pub const Screen = @import("Screen.zig");
+pub const StringMap = @import("StringMap.zig");
 pub const Stream = stream.Stream;
 pub const Cursor = Screen.Cursor;
 pub const CursorStyleReq = ansi.CursorStyle;