X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=i3bar%2Fsrc%2Fchild.c;h=aa9d65549ca7a5abd259ffbcb6e318b7406111c6;hb=39f15da82f69cd91d50c2d398d636e5efbd2d829;hp=4854118506a55695bbbac7f457efd241f19dab06;hpb=497a091fbbce5c93e5d2db75ddeb46d2131748ab;p=i3%2Fi3

diff --git a/i3bar/src/child.c b/i3bar/src/child.c
index 48541185..fd4185ee 100644
--- a/i3bar/src/child.c
+++ b/i3bar/src/child.c
@@ -1,87 +1,347 @@
 /*
- * i3bar - an xcb-based status- and ws-bar for i3
- *
- * © 2010 Axel Wagner and contributors
+ * vim:ts=4:sw=4:expandtab
  *
- * See file LICNSE for license information
+ * i3bar - an xcb-based status- and ws-bar for i3
+ * © 2010-2012 Axel Wagner and contributors (see also: LICENSE)
  *
- * src/child.c: Getting Input for the statusline
+ * child.c: Getting Input for the statusline
  *
  */
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <signal.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <string.h>
 #include <errno.h>
+#include <err.h>
 #include <ev.h>
+#include <yajl/yajl_common.h>
+#include <yajl/yajl_parse.h>
+#include <yajl/yajl_version.h>
+#include <yajl/yajl_gen.h>
+#include <paths.h>
 
 #include "common.h"
 
 /* Global variables for child_*() */
-pid_t child_pid;
+i3bar_child child = { 0 };
 
 /* stdin- and sigchild-watchers */
 ev_io    *stdin_io;
 ev_child *child_sig;
 
+/* JSON parser for stdin */
+yajl_callbacks callbacks;
+yajl_handle parser;
+
+/* JSON generator for stdout */
+yajl_gen gen;
+
+typedef struct parser_ctx {
+    /* True if one of the parsed blocks was urgent */
+    bool has_urgent;
+
+    /* A copy of the last JSON map key. */
+    char *last_map_key;
+
+    /* The current block. Will be filled, then copied and put into the list of
+     * blocks. */
+    struct status_block block;
+} parser_ctx;
+
+parser_ctx parser_context;
+
+/* The buffer statusline points to */
+struct statusline_head statusline_head = TAILQ_HEAD_INITIALIZER(statusline_head);
+char *statusline_buffer = NULL;
+
+int child_stdin;
+
 /*
  * Stop and free() the stdin- and sigchild-watchers
  *
  */
-void cleanup() {
-    ev_io_stop(main_loop, stdin_io);
-    ev_child_stop(main_loop, child_sig);
-    FREE(stdin_io);
-    FREE(child_sig);
-    FREE(statusline);
+void cleanup(void) {
+    if (stdin_io != NULL) {
+        ev_io_stop(main_loop, stdin_io);
+        FREE(stdin_io);
+        FREE(statusline_buffer);
+        /* statusline pointed to memory within statusline_buffer */
+        statusline = NULL;
+    }
+
+    if (child_sig != NULL) {
+        ev_child_stop(main_loop, child_sig);
+        FREE(child_sig);
+    }
+
+    memset(&child, 0, sizeof(i3bar_child));
 }
 
 /*
- * Callbalk for stdin. We read a line from stdin and store the result
- * in statusline
+ * The start of a new array is the start of a new status line, so we clear all
+ * previous entries.
  *
  */
-void stdin_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
+static int stdin_start_array(void *context) {
+    struct status_block *first;
+    while (!TAILQ_EMPTY(&statusline_head)) {
+        first = TAILQ_FIRST(&statusline_head);
+        I3STRING_FREE(first->full_text);
+        FREE(first->color);
+        FREE(first->name);
+        FREE(first->instance);
+        TAILQ_REMOVE(&statusline_head, first, blocks);
+        free(first);
+    }
+    return 1;
+}
+
+/*
+ * The start of a map is the start of a single block of the status line.
+ *
+ */
+static int stdin_start_map(void *context) {
+    parser_ctx *ctx = context;
+    memset(&(ctx->block), '\0', sizeof(struct status_block));
+
+    /* Default width of the separator block. */
+    ctx->block.sep_block_width = 9;
+
+    return 1;
+}
+
+#if YAJL_MAJOR >= 2
+static int stdin_map_key(void *context, const unsigned char *key, size_t len) {
+#else
+static int stdin_map_key(void *context, const unsigned char *key, unsigned int len) {
+#endif
+    parser_ctx *ctx = context;
+    FREE(ctx->last_map_key);
+    sasprintf(&(ctx->last_map_key), "%.*s", len, key);
+    return 1;
+}
+
+static int stdin_boolean(void *context, int val) {
+    parser_ctx *ctx = context;
+    if (strcasecmp(ctx->last_map_key, "urgent") == 0) {
+        ctx->block.urgent = val;
+    }
+    if (strcasecmp(ctx->last_map_key, "separator") == 0) {
+        ctx->block.no_separator = !val;
+    }
+    return 1;
+}
+
+#if YAJL_MAJOR >= 2
+static int stdin_string(void *context, const unsigned char *val, size_t len) {
+#else
+static int stdin_string(void *context, const unsigned char *val, unsigned int len) {
+#endif
+    parser_ctx *ctx = context;
+    if (strcasecmp(ctx->last_map_key, "full_text") == 0) {
+        ctx->block.full_text = i3string_from_utf8_with_length((const char *)val, len);
+    }
+    if (strcasecmp(ctx->last_map_key, "color") == 0) {
+        sasprintf(&(ctx->block.color), "%.*s", len, val);
+    }
+    if (strcasecmp(ctx->last_map_key, "align") == 0) {
+        if (len == strlen("left") && !strncmp((const char*)val, "left", strlen("left"))) {
+            ctx->block.align = ALIGN_LEFT;
+        } else if (len == strlen("right") && !strncmp((const char*)val, "right", strlen("right"))) {
+            ctx->block.align = ALIGN_RIGHT;
+        } else {
+            ctx->block.align = ALIGN_CENTER;
+        }
+    } else if (strcasecmp(ctx->last_map_key, "min_width") == 0) {
+        i3String *text = i3string_from_utf8_with_length((const char *)val, len);
+        ctx->block.min_width = (uint32_t)predict_text_width(text);
+        i3string_free(text);
+    }
+    if (strcasecmp(ctx->last_map_key, "name") == 0) {
+        char *copy = (char*)malloc(len+1);
+        strncpy(copy, (const char *)val, len);
+        copy[len] = 0;
+        ctx->block.name = copy;
+    }
+    if (strcasecmp(ctx->last_map_key, "instance") == 0) {
+        char *copy = (char*)malloc(len+1);
+        strncpy(copy, (const char *)val, len);
+        copy[len] = 0;
+        ctx->block.instance = copy;
+    }
+    return 1;
+}
+
+#if YAJL_MAJOR >= 2
+static int stdin_integer(void *context, long long val) {
+#else
+static int stdin_integer(void *context, long val) {
+#endif
+    parser_ctx *ctx = context;
+    if (strcasecmp(ctx->last_map_key, "min_width") == 0) {
+        ctx->block.min_width = (uint32_t)val;
+    }
+    if (strcasecmp(ctx->last_map_key, "separator_block_width") == 0) {
+        ctx->block.sep_block_width = (uint32_t)val;
+    }
+    return 1;
+}
+
+static int stdin_end_map(void *context) {
+    parser_ctx *ctx = context;
+    struct status_block *new_block = smalloc(sizeof(struct status_block));
+    memcpy(new_block, &(ctx->block), sizeof(struct status_block));
+    /* Ensure we have a full_text set, so that when it is missing (or null),
+     * i3bar doesn’t crash and the user gets an annoying message. */
+    if (!new_block->full_text)
+        new_block->full_text = i3string_from_utf8("SPEC VIOLATION (null)");
+    if (new_block->urgent)
+        ctx->has_urgent = true;
+    TAILQ_INSERT_TAIL(&statusline_head, new_block, blocks);
+    return 1;
+}
+
+static int stdin_end_array(void *context) {
+    DLOG("dumping statusline:\n");
+    struct status_block *current;
+    TAILQ_FOREACH(current, &statusline_head, blocks) {
+        DLOG("full_text = %s\n", i3string_as_utf8(current->full_text));
+        DLOG("color = %s\n", current->color);
+    }
+    DLOG("end of dump\n");
+    return 1;
+}
+
+/*
+ * Helper function to read stdin
+ *
+ */
+static unsigned char *get_buffer(ev_io *watcher, int *ret_buffer_len) {
     int fd = watcher->fd;
     int n = 0;
     int rec = 0;
     int buffer_len = STDIN_CHUNK_SIZE;
-    char *buffer = malloc(buffer_len);
-    memset(buffer, '\0', buffer_len);
+    unsigned char *buffer = smalloc(buffer_len+1);
+    buffer[0] = '\0';
     while(1) {
         n = read(fd, buffer + rec, buffer_len - rec);
         if (n == -1) {
             if (errno == EAGAIN) {
-                /* remove trailing newline and finish up */
-                buffer[rec-1] = '\0';
+                /* finish up */
                 break;
             }
             ELOG("read() failed!: %s\n", strerror(errno));
             exit(EXIT_FAILURE);
         }
         if (n == 0) {
-            if (rec == buffer_len) {
-                buffer_len += STDIN_CHUNK_SIZE;
-                buffer = realloc(buffer, buffer_len);
-            } else {
-                /* remove trailing newline and finish up */
-                buffer[rec-1] = '\0';
-                break;
-            }
+            /* end of file, kill the watcher */
+            ELOG("stdin: received EOF\n");
+            cleanup();
+            draw_bars(false);
+            *ret_buffer_len = -1;
+            return NULL;
         }
         rec += n;
+
+        if (rec == buffer_len) {
+            buffer_len += STDIN_CHUNK_SIZE;
+            buffer = srealloc(buffer, buffer_len);
+        }
     }
     if (*buffer == '\0') {
         FREE(buffer);
+        rec = -1;
+    }
+    *ret_buffer_len = rec;
+    return buffer;
+}
+
+static void read_flat_input(char *buffer, int length) {
+    struct status_block *first = TAILQ_FIRST(&statusline_head);
+    /* Clear the old buffer if any. */
+    I3STRING_FREE(first->full_text);
+    /* Remove the trailing newline and terminate the string at the same
+     * time. */
+    if (buffer[length-1] == '\n' || buffer[length-1] == '\r')
+        buffer[length-1] = '\0';
+    else buffer[length] = '\0';
+    first->full_text = i3string_from_utf8(buffer);
+}
+
+static bool read_json_input(unsigned char *input, int length) {
+    yajl_status status = yajl_parse(parser, input, length);
+    bool has_urgent = false;
+#if YAJL_MAJOR >= 2
+    if (status != yajl_status_ok) {
+#else
+    if (status != yajl_status_ok && status != yajl_status_insufficient_data) {
+#endif
+        fprintf(stderr, "[i3bar] Could not parse JSON input (code %d): %.*s\n",
+                status, length, input);
+    } else if (parser_context.has_urgent) {
+        has_urgent = true;
+    }
+    return has_urgent;
+}
+
+/*
+ * Callbalk for stdin. We read a line from stdin and store the result
+ * in statusline
+ *
+ */
+void stdin_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
+    int rec;
+    unsigned char *buffer = get_buffer(watcher, &rec);
+    if (buffer == NULL)
         return;
+    bool has_urgent = false;
+    if (child.version > 0) {
+        has_urgent = read_json_input(buffer, rec);
+    } else {
+        read_flat_input((char*)buffer, rec);
     }
-    FREE(statusline);
-    statusline = buffer;
-    DLOG("%s\n", buffer);
-    draw_bars();
+    free(buffer);
+    draw_bars(has_urgent);
+}
+
+/*
+ * Callbalk for stdin first line. We read the first line to detect
+ * whether this is JSON or plain text
+ *
+ */
+void stdin_io_first_line_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
+    int rec;
+    unsigned char *buffer = get_buffer(watcher, &rec);
+    if (buffer == NULL)
+        return;
+    DLOG("Detecting input type based on buffer *%.*s*\n", rec, buffer);
+    /* Detect whether this is JSON or plain text. */
+    unsigned int consumed = 0;
+    /* At the moment, we don’t care for the version. This might change
+     * in the future, but for now, we just discard it. */
+    parse_json_header(&child, buffer, rec, &consumed);
+    if (child.version > 0) {
+        /* If hide-on-modifier is set, we start of by sending the
+         * child a SIGSTOP, because the bars aren't mapped at start */
+        if (config.hide_on_modifier) {
+            stop_child();
+        }
+        read_json_input(buffer + consumed, rec - consumed);
+    } else {
+        /* In case of plaintext, we just add a single block and change its
+         * full_text pointer later. */
+        struct status_block *new_block = scalloc(sizeof(struct status_block));
+        TAILQ_INSERT_TAIL(&statusline_head, new_block, blocks);
+        read_flat_input((char*)buffer, rec);
+    }
+    free(buffer);
+    ev_io_stop(main_loop, stdin_io);
+    ev_io_init(stdin_io, &stdin_io_cb, STDIN_FILENO, EV_READ);
+    ev_io_start(main_loop, stdin_io);
 }
 
 /*
@@ -91,12 +351,27 @@ void stdin_io_cb(struct ev_loop *loop, ev_io *watcher, int revents) {
  *
  */
 void child_sig_cb(struct ev_loop *loop, ev_child *watcher, int revents) {
-    DLOG("Child (pid: %d) unexpectedly exited with status %d\n",
-           child_pid,
+    ELOG("Child (pid: %d) unexpectedly exited with status %d\n",
+           child.pid,
            watcher->rstatus);
     cleanup();
 }
 
+void child_write_output(void) {
+    if (child.click_events) {
+        const unsigned char *output;
+#if YAJL_MAJOR < 2
+        unsigned int size;
+#else
+        size_t size;
+#endif
+        yajl_gen_get_buf(gen, &output, &size);
+        write(child_stdin, output, size);
+        write(child_stdin, "\n", 1);
+        yajl_gen_clear(gen);
+    }
+}
+
 /*
  * Start a child-process with the specified command and reroute stdin.
  * We actually start a $SHELL to execute the command so we don't have to care
@@ -104,33 +379,62 @@ void child_sig_cb(struct ev_loop *loop, ev_child *watcher, int revents) {
  *
  */
 void start_child(char *command) {
-    child_pid = 0;
+    /* Allocate a yajl parser which will be used to parse stdin. */
+    memset(&callbacks, '\0', sizeof(yajl_callbacks));
+    callbacks.yajl_map_key = stdin_map_key;
+    callbacks.yajl_boolean = stdin_boolean;
+    callbacks.yajl_string = stdin_string;
+    callbacks.yajl_integer = stdin_integer;
+    callbacks.yajl_start_array = stdin_start_array;
+    callbacks.yajl_end_array = stdin_end_array;
+    callbacks.yajl_start_map = stdin_start_map;
+    callbacks.yajl_end_map = stdin_end_map;
+#if YAJL_MAJOR < 2
+    yajl_parser_config parse_conf = { 0, 0 };
+
+    parser = yajl_alloc(&callbacks, &parse_conf, NULL, (void*)&parser_context);
+
+    gen = yajl_gen_alloc(NULL, NULL);
+#else
+    parser = yajl_alloc(&callbacks, NULL, &parser_context);
+
+    gen = yajl_gen_alloc(NULL);
+#endif
+
     if (command != NULL) {
-        int fd[2];
-        pipe(fd);
-        child_pid = fork();
-        switch (child_pid) {
+        int pipe_in[2]; /* pipe we read from */
+        int pipe_out[2]; /* pipe we write to */
+
+        if (pipe(pipe_in) == -1)
+            err(EXIT_FAILURE, "pipe(pipe_in)");
+        if (pipe(pipe_out) == -1)
+            err(EXIT_FAILURE, "pipe(pipe_out)");
+
+        child.pid = fork();
+        switch (child.pid) {
             case -1:
                 ELOG("Couldn't fork(): %s\n", strerror(errno));
                 exit(EXIT_FAILURE);
             case 0:
-                /* Child-process. Reroute stdout and start shell */
-                close(fd[0]);
+                /* Child-process. Reroute streams and start shell */
 
-                dup2(fd[1], STDOUT_FILENO);
+                close(pipe_in[0]);
+                close(pipe_out[1]);
 
-                static const char *shell = NULL;
+                dup2(pipe_in[1], STDOUT_FILENO);
+                dup2(pipe_out[0], STDIN_FILENO);
 
-                if ((shell = getenv("SHELL")) == NULL)
-                    shell = "/bin/sh";
-
-                execl(shell, shell, "-c", command, (char*) NULL);
+                setpgid(child.pid, 0);
+                execl(_PATH_BSHELL, _PATH_BSHELL, "-c", command, (char*) NULL);
                 return;
             default:
-                /* Parent-process. Rerout stdin */
-                close(fd[1]);
+                /* Parent-process. Reroute streams */
+
+                close(pipe_in[1]);
+                close(pipe_out[0]);
 
-                dup2(fd[0], STDIN_FILENO);
+                dup2(pipe_in[0], STDIN_FILENO);
+                child_stdin = pipe_out[1];
 
                 break;
         }
@@ -139,15 +443,74 @@ void start_child(char *command) {
     /* We set O_NONBLOCK because blocking is evil in event-driven software */
     fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
 
-    stdin_io = malloc(sizeof(ev_io));
-    ev_io_init(stdin_io, &stdin_io_cb, STDIN_FILENO, EV_READ);
+    stdin_io = smalloc(sizeof(ev_io));
+    ev_io_init(stdin_io, &stdin_io_first_line_cb, STDIN_FILENO, EV_READ);
     ev_io_start(main_loop, stdin_io);
 
     /* We must cleanup, if the child unexpectedly terminates */
-    child_sig = malloc(sizeof(ev_child));
-    ev_child_init(child_sig, &child_sig_cb, child_pid, 0);
+    child_sig = smalloc(sizeof(ev_child));
+    ev_child_init(child_sig, &child_sig_cb, child.pid, 0);
     ev_child_start(main_loop, child_sig);
 
+    atexit(kill_child_at_exit);
+}
+
+void child_click_events_initialize(void) {
+    if (!child.click_events_init) {
+        yajl_gen_array_open(gen);
+        child_write_output();
+        child.click_events_init = true;
+    }
+}
+
+void child_click_events_key(const char *key) {
+    yajl_gen_string(gen, (const unsigned char *)key, strlen(key));
+}
+
+/*
+ * Generates a click event, if enabled.
+ *
+ */
+void send_block_clicked(int button, const char *name, const char *instance, int x, int y) {
+    if (child.click_events) {
+        child_click_events_initialize();
+
+        yajl_gen_map_open(gen);
+
+        if (name) {
+            child_click_events_key("name");
+            yajl_gen_string(gen, (const unsigned char *)name, strlen(name));
+        }
+
+        if (instance) {
+            child_click_events_key("instance");
+            yajl_gen_string(gen, (const unsigned char *)instance, strlen(instance));
+        }
+
+        child_click_events_key("button");
+        yajl_gen_integer(gen, button);
+
+        child_click_events_key("x");
+        yajl_gen_integer(gen, x);
+
+        child_click_events_key("y");
+        yajl_gen_integer(gen, y);
+
+        yajl_gen_map_close(gen);
+        child_write_output();
+    }
+}
+
+/*
+ * kill()s the child-process (if any). Called when exit()ing.
+ *
+ */
+void kill_child_at_exit(void) {
+    if (child.pid > 0) {
+        if (child.cont_signal > 0 && child.stopped)
+            killpg(child.pid, child.cont_signal);
+        killpg(child.pid, SIGTERM);
+    }
 }
 
 /*
@@ -155,21 +518,25 @@ void start_child(char *command) {
  * free()s the stdin- and sigchild-watchers
  *
  */
-void kill_child() {
-    if (child_pid != 0) {
-        kill(child_pid, SIGCONT);
-        kill(child_pid, SIGTERM);
+void kill_child(void) {
+    if (child.pid > 0) {
+        if (child.cont_signal > 0 && child.stopped)
+            killpg(child.pid, child.cont_signal);
+        killpg(child.pid, SIGTERM);
+        int status;
+        waitpid(child.pid, &status, 0);
+        cleanup();
     }
-    cleanup();
 }
 
 /*
  * Sends a SIGSTOP to the child-process (if existent)
  *
  */
-void stop_child() {
-    if (child_pid != 0) {
-        kill(child_pid, SIGSTOP);
+void stop_child(void) {
+    if (child.stop_signal > 0 && !child.stopped) {
+        child.stopped = true;
+        killpg(child.pid, child.stop_signal);
     }
 }
 
@@ -177,8 +544,9 @@ void stop_child() {
  * Sends a SIGCONT to the child-process (if existent)
  *
  */
-void cont_child() {
-    if (child_pid != 0) {
-        kill(child_pid, SIGCONT);
+void cont_child(void) {
+    if (child.cont_signal > 0 && child.stopped) {
+        child.stopped = false;
+        killpg(child.pid, child.cont_signal);
     }
 }