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Diffstat (limited to 'Build/source/utils/xpdfopen/pdfopen.c')
-rw-r--r-- | Build/source/utils/xpdfopen/pdfopen.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/Build/source/utils/xpdfopen/pdfopen.c b/Build/source/utils/xpdfopen/pdfopen.c new file mode 100644 index 00000000000..abee956964a --- /dev/null +++ b/Build/source/utils/xpdfopen/pdfopen.c @@ -0,0 +1,375 @@ +/* + * pdfopen.c. + * + * Heavily modified by Jim Diamond (jim.diamond@acadiau.ca) 2010/04/11 + * to work with AR 9 and xpdf. + * Also some mods by Peter Breitenlohner <tex-live@tug.org> from 2009 + * and suggestions from 2010. + * + * Note 1: the calling sequence was changed considerably to match what + * the program actually seemed to do as well as what made sense to me. + * + * Note 2: if there are two instances of acroread displaying that file, + * only one is reloaded. + * + * Further modified 2010/05/03 to work with ar5, and to include some code + * that does *not* work with okular (see note below). + * + * Note 3: Unlike xpdf and AR[5,7,8,9], okular will not accept X events + * from this program unless the okular window has focus. On my system + * (Slackware64 13.0, using fvwm2), the functions I added to sendx.c to try + * to change the focus to the okular window do not work. (See also the + * comments in sendx.c.) If anyone cares to contribute working code, + * please send it to me for inclusion. + */ + +#define VERSION "0.80" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/wait.h> + +#include "sendx.h" +#include "xpdfopen.h" +#include "utils.h" + +#define MAX_OPTIONS 10 +#define MAX_RELOAD_CMDS 10 + +/* A string unlikely to be used as a real command by a PDF viewer */ +#define FORK_EXEC_CMD "*FORK EXEC*" + + +/* Used in the pdf_viewer_t type... see comment below */ +typedef enum +{ + USE_SENDX, USE_FORK_EXEC +} reload_method_t; + + +/* + * This struct contains the information needed for both + * (a) initially starting up a PDF viewer, and + * (b) telling the viewer to reload the document. + * Of course, the viewer has to support that functionality. + * Two possible ways are supported. + * (a) Send the viewer's window (a) simulated keypress(ss) + * (b) fork()/exec() a second instance of the program which somehow signals + * the running instance. Note that this is problematical if the + * arguments for the "reload" case are different than the options + * for the "start up the viewer" case, because the command-line + * (and environment variable) syntax have to be extended. + * Arguably, if both the start-up and reload can be done with shell + * commands, the user should just write a shell script and be done with + * it. + * These could be extended with this as well: + * (c) send a Unix signal to the currently running viewer. + * This would require augmenting reload_method_t and pdf_viewer_t. + */ + +typedef struct +{ + const char * short_name; /* cmd line option name */ + const char * program_name; /* program to exec() */ + reload_method_t method; /* method to induce reload */ + const char * window_name; /* when no file is viewed */ + const char * window_name_fmt; /* fmt string for file viewed */ + const char * exec_pre_options[MAX_OPTIONS]; /* before filename in cmd */ + const char * exec_post_options[MAX_OPTIONS];/* after filename in cmd */ + const char * reload_cmds[MAX_RELOAD_CMDS]; /* cmds to reload a file */ +} pdf_viewer_t; + + +/* Reload commands (or prefixes thereof) */ +#define CTRL "Ctrl-" +#define ALT "Alt-" +#define CTRL_ALT "Ctrl-Alt-" +#define FN "Fn-" +#define FOCUS_IN "FOCUS-IN" +#define FOCUS_OUT "FOCUS-OUT" + + + +/* + * The first struct represents the default viewer with the default options. + */ +pdf_viewer_t pdf_viewers[] = +{ + {"ar9", "acroread", USE_SENDX, + AR9_WIN_NAME, AR9_WIN_NAME_FMT, + {"-openInNewWindow", NULL}, + {NULL}, + {"Ctrl-R", NULL}}, + {"ar9-tab", "acroread", USE_SENDX, + AR9_WIN_NAME, AR9_WIN_NAME_FMT, + {NULL}, + {NULL}, + {"Ctrl-R", NULL}}, + {"ar8", "acroread", USE_SENDX, + AR8_WIN_NAME, AR8_WIN_NAME_FMT, + {NULL}, + {NULL}, + {"Ctrl-W", FORK_EXEC_CMD, NULL}}, + {"ar7", "acroread", USE_SENDX, + AR7_WIN_NAME, AR7_WIN_NAME_FMT, + {NULL}, + {NULL}, + {"Ctrl-W", "Alt-Left", NULL}}, + {"ar5", "acroread", USE_SENDX, + AR5_WIN_NAME, AR5_WIN_NAME_FMT, + {NULL}, + {NULL}, + {"Ctrl-W", "Alt-Left", NULL}}, + /* + * xpdf also allows 'xpdf -remote tex -reload', but if that xpdf server + * is not running, rather than a failure return, a blank window is + * opened. This is not much good to us. + * Using "tex-server" as the server name is an arbitrary choice. + */ + {"xpdf", "xpdf", USE_SENDX, + XPDF_WIN_NAME, XPDF_WIN_NAME_FMT, + {"-remote", "tex-server", NULL}, + {NULL}, + {"r", NULL}}, +#ifdef TRY_OCULAR + {"okular", "okular", USE_SENDX, + OKULAR_WIN_NAME, OKULAR_WIN_NAME_FMT, + {NULL}, + {NULL}, + {FOCUS_IN, "Fn-F5", FOCUS_OUT, NULL}}, +#endif +}; + +char * progname; /* set in main(); NOT static! */ + +#define DEFAULT_VIEWER (pdf_viewers[0].short_name) + + + +static void +usage(void) +{ + int i; + int viewers = sizeof(pdf_viewers) / sizeof(pdf_viewers[0]); + + fprintf(stderr, "Usage: %s [-viewer <prog>] <file.pdf>\n", progname); + fprintf(stderr, "\tIf the PDF viewer <prog> is displaying <file.pdf>, " + "reload that file.\n"); + fprintf(stderr, "\tOtherwise call <prog> to display <file.pdf>.\n"); + fprintf(stderr, "\tThe default viewer program is %s.\n", DEFAULT_VIEWER); + fprintf(stderr, "\tImplemented viewers are"); + for (i = 0; i < viewers - 1; i++) + fprintf(stderr, " '%s'", pdf_viewers[i].short_name); + fprintf(stderr, " and '%s'.\n", pdf_viewers[viewers - 1].short_name); + fprintf(stderr, "\tThis is version %s of %s\n", VERSION, progname); +} + + + +/* + * Send one "command" to the given window. + * The command can be of these forms (for X an upper case letter or arrow + * key, such as "Left", and D one or more digits; see sendx.c): + * - Ctrl-X + * - Alt-X + * - Ctrl-Atl-X + * - Fn-FD + * - FOCUS-[IN|OUT] + * - <string> (not starting with any of the above prefixes) + * Allow other variations on the cases of "Ctrl" and "Alt". + * + * Return 0 on success, non-0 otherwise. + */ + +static int +send_command(const char * window_name, const char * reload_cmd) +{ + int alt_len, ctrl_len, ctrl_alt_len, fn_len, focus_len; + + if (!strcmp(reload_cmd, FORK_EXEC_CMD)) + return 999; + + ctrl_alt_len = strlen(CTRL_ALT); + if (!strncasecmp(CTRL_ALT, reload_cmd, ctrl_alt_len)) + return sendx_controlalt_token(reload_cmd + ctrl_alt_len, window_name); + + ctrl_len = strlen(CTRL); + if (!strncasecmp(CTRL, reload_cmd, ctrl_len)) + return sendx_control_token(reload_cmd + ctrl_len, window_name); + + alt_len = strlen(ALT); + if (!strncasecmp(ALT, reload_cmd, alt_len)) + return sendx_alt_token(reload_cmd + alt_len, window_name); + + fn_len = strlen(FN); + if (!strncasecmp(FN, reload_cmd, fn_len)) + return sendx_token(reload_cmd + fn_len, window_name); + + focus_len = strlen(FOCUS_IN); + if (!strncasecmp(FOCUS_IN, reload_cmd, focus_len)) + return set_focus(window_name); + + focus_len = strlen(FOCUS_OUT); + if (!strncasecmp(FOCUS_OUT, reload_cmd, focus_len)) + return reset_focus(); + + return sendx_string(reload_cmd, window_name); +} + + + +/* + * Try to reload the file, then if not successful to start up a new + * instance of the viewer program. + * Return 0 on success, non-0 otherwise. + */ + +static int +view_file(const char * filename, int viewer_index) +{ + char * window_name; + pid_t pid; + int success = 0; + pdf_viewer_t pdf_viewer = pdf_viewers[viewer_index]; + const char ** reload_cmds = pdf_viewer.reload_cmds; + + /* First try to reload the file */ + switch (pdf_viewers[viewer_index].method) + { + case USE_SENDX: + window_name = make_window_name(pdf_viewer.window_name_fmt, filename); + if (window_name == NULL) + return 99; + while (*reload_cmds) + { + /* + * Note: there is a race condition in the sendx.c code which + * can cause the program to crash and burn with a 'BadWindow' + * fault. This has been observed for AR8 (but not AR7, oddly) + * after the ^W causes AR8 to change the window name. It seems + * that Window_With_Name() tries to access a BadWindow within + * its recursive call. + * If this continues to be a problem, a usleep() may make the + * problem go away. + */ + success = ! send_command(window_name, *reload_cmds); + if (! success && reload_cmds != pdf_viewer.reload_cmds) + { + /* + * In some cases the window name might be changed because + * of the first command. + * For example, in AR7 the first command (^W) "closes" + * the document, and the window title changes to reflect + * the fact there is no document. So try that command with + * the "plain" window name. + */ + success = ! send_command(pdf_viewer.window_name, *reload_cmds); + } + if (! success) + break; + reload_cmds++; + } + break; + + case USE_FORK_EXEC: + return 2; /* TODO: someone who cares can put some code here */ + break; + + default: + fprintf(stderr, "%s: internal error: invalid reload_method. Sorry.\n", + progname); + return 99; + break; + } + + if (success) + return 0; + + /* + * No luck re-loading the file. + * (Try to) start a new instance of the viewer program. + */ + if ((pid = fork()) == 0) + { + const char * argv_list[2 * MAX_OPTIONS + 3]; + const char ** p; + int i = 0; + + argv_list[i++] = pdf_viewer.program_name; + for (p = pdf_viewer.exec_pre_options; *p;) + argv_list[i++] = *p++; + argv_list[i++] = filename; + for (p = pdf_viewer.exec_post_options; *p;) + argv_list[i++] = *p++; + argv_list[i++] = NULL; + if (execvp(pdf_viewer.program_name, (char **)argv_list)) + { + fprintf(stderr, "%s: %s startup failed\n", progname, + pdf_viewer.program_name); + return 5; + } + } + else if (pid < 0) + { + fprintf(stderr, "%s: fork() failed!?\n", progname); + return 10; + } + + return 0; +} + + + +int +main(int argc, char * argv[]) +{ + const char * viewer = pdf_viewers[0].short_name; + char * env_viewer; + int i; + int viewer_index = -1; + + progname = argv[0]; + + env_viewer = getenv("PDF_VIEWER"); + if (env_viewer != NULL) + viewer = env_viewer; + + if (argc == 4 && !strcmp(argv[1], "-viewer")) + { + viewer = argv[2]; + argc -= 2; + argv += 2; + } + + if (argc != 2) + { + fprintf(stderr, "%s: invalid number of arguments\n", progname); + usage(); + return EXIT_FAILURE; + } + + for (i = 0; i < sizeof(pdf_viewers) / sizeof(pdf_viewers[0]); i++) + { + if (!strcmp(pdf_viewers[i].short_name, viewer)) + { + viewer_index = i; + break; + } + } + + if (viewer_index < 0) + { + fprintf(stderr, "%s: Unknown PDF viewer '%s'\n", progname, viewer); + usage(); + + return EXIT_FAILURE; + } + + if (view_file(argv[1], viewer_index)) + return EXIT_FAILURE; + + return EXIT_SUCCESS; +} |