Replace wlr_log with sway_log

This commit mostly duplicates the wlr_log functions, although
with a sway_* prefix. (This is very similar to PR #2009.)
However, the logging function no longer needs to be replaceable,
so sway_log_init's second argument is used to set the exit
callback for sway_abort.

wlr_log_init is still invoked in sway/main.c

This commit makes it easier to remove the wlroots dependency for
the helper programs swaymsg, swaybg, swaybar, and swaynag.

6 files changed, 99 insertions, 18 deletions

diff --git a/common/background-image.c b/common/background-image.c
index 72f39a79..d15c2989 100644
--- a/common/background-image.c
+++ b/common/background-image.c
@@ -1,8 +1,8 @@
 #include <assert.h>
 #include <stdbool.h>
-#include <wlr/util/log.h>
 #include "background-image.h"
 #include "cairo.h"
+#include "log.h"
 
 enum background_mode parse_background_mode(const char *mode) {
         if (strcmp(mode, "stretch") == 0) {
@@ -18,7 +18,7 @@ enum background_mode parse_background_mode(const char *mode) {
         } else if (strcmp(mode, "solid_color") == 0) {
                 return BACKGROUND_MODE_SOLID_COLOR;
         }
-        wlr_log(WLR_ERROR, "Unsupported background mode: %s", mode);
+        sway_log(SWAY_ERROR, "Unsupported background mode: %s", mode);
         return BACKGROUND_MODE_INVALID;
 }
 
@@ -28,7 +28,7 @@ cairo_surface_t *load_background_image(const char *path) {
         GError *err = NULL;
         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &err);
         if (!pixbuf) {
-                wlr_log(WLR_ERROR, "Failed to load background image (%s).",
+                sway_log(SWAY_ERROR, "Failed to load background image (%s).",
                                 err->message);
                 return false;
         }
@@ -38,11 +38,11 @@ cairo_surface_t *load_background_image(const char *path) {
         image = cairo_image_surface_create_from_png(path);
 #endif // HAVE_GDK_PIXBUF
         if (!image) {
-                wlr_log(WLR_ERROR, "Failed to read background image.");
+                sway_log(SWAY_ERROR, "Failed to read background image.");
                 return NULL;
         }
         if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS) {
-                wlr_log(WLR_ERROR, "Failed to read background image: %s."
+                sway_log(SWAY_ERROR, "Failed to read background image: %s."
 #if !HAVE_GDK_PIXBUF
                                 "\nSway was compiled without gdk_pixbuf support, so only"
                                 "\nPNG images can be loaded. This is the likely cause."
diff --git a/common/ipc-client.c b/common/ipc-client.c
index 79ed3555..13e2dfa3 100644
--- a/common/ipc-client.c
+++ b/common/ipc-client.c
@@ -111,7 +111,7 @@ error_2:
         free(response);
         free(payload);
 error_1:
-        wlr_log(WLR_ERROR, "Unable to allocate memory for IPC response");
+        sway_log(SWAY_ERROR, "Unable to allocate memory for IPC response");
         return NULL;
 }
 
diff --git a/common/log.c b/common/log.c
index 847f3952..669fd360 100644
--- a/common/log.c
+++ b/common/log.c
@@ -1,16 +1,20 @@
+#define _POSIX_C_SOURCE 199506L
 #include <signal.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
 #include "log.h"
 
-void sway_terminate(int code);
+static terminate_callback_t log_terminate = exit;
 
 void _sway_abort(const char *format, ...) {
         va_list args;
         va_start(args, format);
-        _wlr_vlog(WLR_ERROR, format, args);
+        _sway_vlog(SWAY_ERROR, format, args);
         va_end(args);
-        sway_terminate(EXIT_FAILURE);
+        log_terminate(EXIT_FAILURE);
 }
 
 bool _sway_assert(bool condition, const char *format, ...) {
@@ -20,7 +24,7 @@ bool _sway_assert(bool condition, const char *format, ...) {
 
         va_list args;
         va_start(args, format);
-        _wlr_vlog(WLR_ERROR, format, args);
+        _sway_vlog(SWAY_ERROR, format, args);
         va_end(args);
 
 #ifndef NDEBUG
@@ -29,3 +33,80 @@ bool _sway_assert(bool condition, const char *format, ...) {
 
         return false;
 }
+
+static bool colored = true;
+static sway_log_importance_t log_importance = SWAY_ERROR;
+
+static const char *verbosity_colors[] = {
+        [SWAY_SILENT] = "",
+        [SWAY_ERROR ] = "\x1B[1;31m",
+        [SWAY_INFO  ] = "\x1B[1;34m",
+        [SWAY_DEBUG ] = "\x1B[1;30m",
+};
+
+static void sway_log_stderr(sway_log_importance_t verbosity, const char *fmt,
+                va_list args) {
+        if (verbosity > log_importance) {
+                return;
+        }
+        // prefix the time to the log message
+        struct tm result;
+        time_t t = time(NULL);
+        struct tm *tm_info = localtime_r(&t, &result);
+        char buffer[26];
+
+        // generate time prefix
+        strftime(buffer, sizeof(buffer), "%F %T - ", tm_info);
+        fprintf(stderr, "%s", buffer);
+
+        unsigned c = (verbosity < SWAY_LOG_IMPORTANCE_LAST) ? verbosity :
+                SWAY_LOG_IMPORTANCE_LAST - 1;
+
+        if (colored && isatty(STDERR_FILENO)) {
+                fprintf(stderr, "%s", verbosity_colors[c]);
+        }
+
+        vfprintf(stderr, fmt, args);
+
+        if (colored && isatty(STDERR_FILENO)) {
+                fprintf(stderr, "\x1B[0m");
+        }
+        fprintf(stderr, "\n");
+}
+
+void sway_log_init(sway_log_importance_t verbosity, terminate_callback_t callback) {
+        if (verbosity < SWAY_LOG_IMPORTANCE_LAST) {
+                log_importance = verbosity;
+        }
+        if (callback) {
+                log_terminate = callback;
+        }
+}
+
+void _sway_vlog(sway_log_importance_t verbosity, const char *fmt, va_list args) {
+        sway_log_stderr(verbosity, fmt, args);
+}
+
+void _sway_log(sway_log_importance_t verbosity, const char *fmt, ...) {
+        va_list args;
+        va_start(args, fmt);
+        sway_log_stderr(verbosity, fmt, args);
+        va_end(args);
+}
+
+// strips the path prefix from filepath
+// will try to strip SWAY_SRC_DIR as well as a relative src dir
+// e.g. '/src/build/sway/util/log.c' and
+// '../util/log.c' will both be stripped to
+// 'util/log.c'
+const char *_sway_strip_path(const char *filepath) {
+        static int srclen = sizeof(SWAY_SRC_DIR);
+        if (strstr(filepath, SWAY_SRC_DIR) == filepath) {
+                filepath += srclen;
+        } else if (*filepath == '.') {
+                while (*filepath == '.' || *filepath == '/') {
+                        ++filepath;
+                }
+        }
+        return filepath;
+}
diff --git a/common/loop.c b/common/loop.c
index 295f3a30..aecad2f3 100644
--- a/common/loop.c
+++ b/common/loop.c
@@ -34,7 +34,7 @@ struct loop {
 struct loop *loop_create(void) {
         struct loop *loop = calloc(1, sizeof(struct loop));
         if (!loop) {
-                wlr_log(WLR_ERROR, "Unable to allocate memory for loop");
+                sway_log(SWAY_ERROR, "Unable to allocate memory for loop");
                 return NULL;
         }
         loop->fd_capacity = 10;
@@ -107,7 +107,7 @@ void loop_add_fd(struct loop *loop, int fd, short mask,
                 void (*callback)(int fd, short mask, void *data), void *data) {
         struct loop_fd_event *event = calloc(1, sizeof(struct loop_fd_event));
         if (!event) {
-                wlr_log(WLR_ERROR, "Unable to allocate memory for event");
+                sway_log(SWAY_ERROR, "Unable to allocate memory for event");
                 return;
         }
         event->callback = callback;
@@ -129,7 +129,7 @@ struct loop_timer *loop_add_timer(struct loop *loop, int ms,
                 void (*callback)(void *data), void *data) {
         struct loop_timer *timer = calloc(1, sizeof(struct loop_timer));
         if (!timer) {
-                wlr_log(WLR_ERROR, "Unable to allocate memory for timer");
+                sway_log(SWAY_ERROR, "Unable to allocate memory for timer");
                 return NULL;
         }
         timer->callback = callback;
diff --git a/common/pango.c b/common/pango.c
index 7e164043..fc3d0688 100644
--- a/common/pango.c
+++ b/common/pango.c
@@ -61,7 +61,7 @@ PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
                         pango_layout_set_text(layout, buf, -1);
                         free(buf);
                 } else {
-                        wlr_log(WLR_ERROR, "pango_parse_markup '%s' -> error %s", text,
+                        sway_log(SWAY_ERROR, "pango_parse_markup '%s' -> error %s", text,
                                         error->message);
                         g_error_free(error);
                         markup = false; // fallback to plain text
@@ -92,7 +92,7 @@ void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
 
         char *buf = malloc(length);
         if (buf == NULL) {
-                wlr_log(WLR_ERROR, "Failed to allocate memory");
+                sway_log(SWAY_ERROR, "Failed to allocate memory");
                 return;
         }
         va_start(args, fmt);
@@ -119,7 +119,7 @@ void pango_printf(cairo_t *cairo, const char *font,
 
         char *buf = malloc(length);
         if (buf == NULL) {
-                wlr_log(WLR_ERROR, "Failed to allocate memory");
+                sway_log(SWAY_ERROR, "Failed to allocate memory");
                 return;
         }
         va_start(args, fmt);
diff --git a/common/util.c b/common/util.c
index d66058a6..27039dcb 100644
--- a/common/util.c
+++ b/common/util.c
@@ -116,7 +116,7 @@ uint32_t parse_color(const char *color) {
 
         int len = strlen(color);
         if (len != 6 && len != 8) {
-                wlr_log(WLR_DEBUG, "Invalid color %s, defaulting to color 0xFFFFFFFF", color);
+                sway_log(SWAY_DEBUG, "Invalid color %s, defaulting to color 0xFFFFFFFF", color);
                 return 0xFFFFFFFF;
         }
         uint32_t res = (uint32_t)strtoul(color, NULL, 16);
@@ -147,7 +147,7 @@ float parse_float(const char *value) {
         char *end;
         float flt = strtof(value, &end);
         if (*end || errno) {
-                wlr_log(WLR_DEBUG, "Invalid float value '%s', defaulting to NAN", value);
+                sway_log(SWAY_DEBUG, "Invalid float value '%s', defaulting to NAN", value);
                 return NAN;
         }
         return flt;