Implement resize command

1 files changed, 284 insertions, 0 deletions

diff --git a/sway/commands/resize.c b/sway/commands/resize.c
new file mode 100644
index 00000000..93c1fe7d
--- /dev/null
+++ b/sway/commands/resize.c
@@ -0,0 +1,284 @@
+#include <errno.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <wlr/util/log.h>
+#include "sway/commands.h"
+#include "sway/tree/layout.h"
+#include "log.h"
+
+static const int MIN_SANE_W = 100, MIN_SANE_H = 60;
+
+enum resize_unit {
+        RESIZE_UNIT_PX,
+        RESIZE_UNIT_PPT,
+        RESIZE_UNIT_DEFAULT,
+        RESIZE_UNIT_INVALID,
+};
+
+enum resize_axis {
+        RESIZE_AXIS_HORIZONTAL,
+        RESIZE_AXIS_VERTICAL,
+        RESIZE_AXIS_INVALID,
+};
+
+static enum resize_unit parse_resize_unit(const char *unit) {
+        if (strcasecmp(unit, "px") == 0) {
+                return RESIZE_UNIT_PX;
+        }
+        if (strcasecmp(unit, "ppt") == 0) {
+                return RESIZE_UNIT_PPT;
+        }
+        if (strcasecmp(unit, "default") == 0) {
+                return RESIZE_UNIT_DEFAULT;
+        }
+        return RESIZE_UNIT_INVALID;
+}
+
+static enum resize_axis parse_resize_axis(const char *axis) {
+        if (strcasecmp(axis, "width") == 0 || strcasecmp(axis, "horizontal") == 0) {
+                return RESIZE_AXIS_HORIZONTAL;
+        }
+        if (strcasecmp(axis, "height") == 0 || strcasecmp(axis, "vertical") == 0) {
+                return RESIZE_AXIS_VERTICAL;
+        }
+        return RESIZE_AXIS_INVALID;
+}
+
+static int parallel_coord(struct sway_container *c, enum resize_axis a) {
+        return a == RESIZE_AXIS_HORIZONTAL ? c->x : c->y;
+}
+
+static int parallel_size(struct sway_container *c, enum resize_axis a) {
+        return a == RESIZE_AXIS_HORIZONTAL ? c->width : c->height;
+}
+
+static void resize_tiled(int amount, enum resize_axis axis) {
+        struct sway_container *parent = config->handler_context.current_container;
+        struct sway_container *focused = parent;
+        if (!parent) {
+                return;
+        }
+
+        enum sway_container_layout parallel_layout =
+                axis == RESIZE_AXIS_HORIZONTAL ? L_HORIZ : L_VERT;
+        int minor_weight = 0;
+        int major_weight = 0;
+        while (parent->parent) {
+                struct sway_container *next = parent->parent;
+                if (next->layout == parallel_layout) {
+                        for (int i = 0; i < next->children->length; i++) {
+                                struct sway_container *sibling = next->children->items[i];
+
+                                int sibling_pos = parallel_coord(sibling, axis);
+                                int focused_pos = parallel_coord(focused, axis);
+                                int parent_pos = parallel_coord(parent, axis);
+
+                                if (sibling_pos != focused_pos) {
+                                        if (sibling_pos < parent_pos) {
+                                                minor_weight++;
+                                        } else if (sibling_pos > parent_pos) {
+                                                major_weight++;
+                                        }
+                                }
+                        }
+                        if (major_weight || minor_weight) {
+                                break;
+                        }
+                }
+                parent = next;
+        }
+
+        if (parent->type == C_ROOT) {
+                return;
+        }
+
+        wlr_log(L_DEBUG,
+                        "Found the proper parent: %p. It has %d l conts, and %d r conts",
+                        parent->parent, minor_weight, major_weight);
+
+        int min_sane = axis == RESIZE_AXIS_HORIZONTAL ? MIN_SANE_W : MIN_SANE_H;
+
+        //TODO: Ensure rounding is done in such a way that there are NO pixel leaks
+        // ^ ?????
+
+        for (int i = 0; i < parent->parent->children->length; i++) {
+                struct sway_container *sibling = parent->parent->children->items[i];
+
+                int sibling_pos = parallel_coord(sibling, axis);
+                int focused_pos = parallel_coord(focused, axis);
+                int parent_pos = parallel_coord(parent, axis);
+
+                int sibling_size = parallel_size(sibling, axis);
+                int parent_size = parallel_size(parent, axis);
+
+                if (sibling_pos != focused_pos) {
+                        if (sibling_pos < parent_pos) {
+                                double pixels = -amount / minor_weight;
+                                if (major_weight && (sibling_size + pixels / 2) < min_sane) {
+                                        return; // Too small
+                                } else if ((sibling_size + pixels) < min_sane) {
+                                        return; // Too small
+                                }
+                        } else if (sibling_pos > parent_pos) {
+                                double pixels = -amount / major_weight;
+                                if (minor_weight && (sibling_size + pixels / 2) < min_sane) {
+                                        return; // Too small
+                                } else if ((sibling_size + pixels) < min_sane) {
+                                        return; // Too small
+                                }
+                        }
+                } else {
+                        double pixels = amount;
+                        if (parent_size + pixels < min_sane) {
+                                return; // Too small
+                        }
+                }
+        }
+
+        enum resize_edge minor_edge = axis == RESIZE_AXIS_HORIZONTAL ?
+                RESIZE_EDGE_LEFT : RESIZE_EDGE_TOP;
+        enum resize_edge major_edge = axis == RESIZE_AXIS_HORIZONTAL ?
+                RESIZE_EDGE_RIGHT : RESIZE_EDGE_BOTTOM;
+
+        for (int i = 0; i < parent->parent->children->length; i++) {
+                struct sway_container *sibling = parent->parent->children->items[i];
+
+                int sibling_pos = parallel_coord(sibling, axis);
+                int focused_pos = parallel_coord(focused, axis);
+                int parent_pos = parallel_coord(parent, axis);
+
+                if (sibling_pos != focused_pos) {
+                        if (sibling_pos < parent_pos) {
+                                double pixels = -1 * amount;
+                                pixels /= minor_weight;
+                                if (major_weight) {
+                                        container_recursive_resize(sibling, pixels / 2, major_edge);
+                                } else {
+                                        container_recursive_resize(sibling, pixels, major_edge);
+                                }
+                        } else if (sibling_pos > parent_pos) {
+                                double pixels = -1 * amount;
+                                pixels /= major_weight;
+                                if (minor_weight) {
+                                        container_recursive_resize(sibling, pixels / 2, minor_edge);
+                                } else {
+                                        container_recursive_resize(sibling, pixels, minor_edge);
+                                }
+                        }
+                } else {
+                        if (major_weight != 0 && minor_weight != 0) {
+                                double pixels = amount;
+                                pixels /= 2;
+                                container_recursive_resize(parent, pixels, minor_edge);
+                                container_recursive_resize(parent, pixels, major_edge);
+                        } else if (major_weight) {
+                                container_recursive_resize(parent, amount, major_edge);
+                        } else if (minor_weight) {
+                                container_recursive_resize(parent, amount, minor_edge);
+                        }
+                }
+        }
+
+        arrange_windows(parent->parent, -1, -1);
+}
+
+static void resize(int amount, enum resize_axis axis, enum resize_unit unit) {
+        struct sway_container *current = config->handler_context.current_container;
+        if (unit == RESIZE_UNIT_DEFAULT) {
+                // Default for tiling; TODO floating should be px
+                unit = RESIZE_UNIT_PPT;
+        }
+
+        if (unit == RESIZE_UNIT_PPT) {
+                float pct = amount / 100.0f;
+                switch (axis) {
+                case RESIZE_AXIS_HORIZONTAL:
+                        amount = (float)current->width * pct;
+                        break;
+                case RESIZE_AXIS_VERTICAL:
+                        amount = (float)current->height * pct;
+                        break;
+                default:
+                        sway_assert(0, "invalid resize axis");
+                        return;
+                }
+        }
+
+        return resize_tiled(amount, axis);
+}
+
+struct cmd_results *cmd_resize(int argc, char **argv) {
+        struct sway_container *current = config->handler_context.current_container;
+        if (!current) {
+                return cmd_results_new(CMD_INVALID, "resize", "Cannot resize nothing");
+        }
+        if (current->type != C_VIEW && current->type != C_CONTAINER) {
+                return cmd_results_new(CMD_INVALID, "resize",
+                                "Can only resize views/containers");
+        }
+        if (strcasecmp(argv[0], "set") == 0) {
+                // TODO
+                //return cmd_resize_set(argc - 1, &argv[1]);
+                return cmd_results_new(CMD_INVALID, "resize", "resize set unimplemented");
+        }
+        struct cmd_results *error;
+        if ((error = checkarg(argc, "resize", EXPECTED_AT_LEAST, 2))) {
+                return error;
+        }
+
+        // TODO: resize grow|shrink left|right|up|down
+
+        const char *usage = "Expected 'resize <shrink|grow> "
+                "<width|height> [<amount>] [px|ppt]'";
+
+        int multiplier = 0;
+        if (strcasecmp(*argv, "grow") == 0) {
+                multiplier = 1;
+        } else if (strcasecmp(*argv, "shrink") == 0) {
+                multiplier = -1;
+        } else {
+                return cmd_results_new(CMD_INVALID, "resize", usage);
+        }
+        --argc; ++argv;
+
+        enum resize_axis axis = parse_resize_axis(*argv);
+        if (axis == RESIZE_AXIS_INVALID) {
+                return cmd_results_new(CMD_INVALID, "resize", usage);
+        }
+        --argc; ++argv;
+
+        int amount = 10; // Default amount
+        enum resize_unit unit = RESIZE_UNIT_DEFAULT;
+
+        if (argc) {
+                char *err;
+                amount = (int)strtol(*argv, &err, 10);
+                if (*err) {
+                        // e.g. `resize grow width 10px`
+                        unit = parse_resize_unit(err);
+                        if (unit == RESIZE_UNIT_INVALID) {
+                                return cmd_results_new(CMD_INVALID, "resize", usage);
+                        }
+                }
+                --argc; ++argv;
+        }
+
+        if (argc) {
+                unit = parse_resize_unit(*argv);
+                if (unit == RESIZE_UNIT_INVALID) {
+                        return cmd_results_new(CMD_INVALID, "resize", usage);
+                }
+                --argc; ++argv;
+        }
+
+        if (argc) {
+                // Provied too many args, the bastard
+                return cmd_results_new(CMD_INVALID, "resize", usage);
+        }
+
+        resize(amount * multiplier, axis, unit);
+        return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}