help: add "man.viewer" config var to use "woman" or "konqueror"

From

Christian Couder <chriscool@tuxfamily.org>

Date

Feb 26, 2008, 06:06 UTC

Message-ID

<20080226070648.5d799056.chriscool@tuxfamily.org>

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 help.c |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 79 insertions(+), 1 deletions(-)

	Junio wrote:
	> I have to wonder if it makes sense to just define the interface
	> to launch an external user-supplied command, and have that
	> command line determine what actually should happen, e.g. inspect
	> DISPLAY and check emacs version etc.

	There is some work on git-mergetool to do this. When it's integrated
	I will see if I can do something like that for git-help too.   

diff --git a/help.c b/help.c
index e57a50e..d700681 100644
--- a/help.c
+++ b/help.c
@@ -8,6 +8,9 @@
 #include "exec_cmd.h"
 #include "common-cmds.h"
 #include "parse-options.h"
+#include "run-command.h"
+
+static const char *man_viewer;
 
 enum help_format {
 	HELP_FORMAT_MAN,
@@ -50,6 +53,8 @@ static int git_help_config(const char *var, const char *value)
 		help_format = parse_help_format(value);
 		return 0;
 	}
+	if (!strcmp(var, "man.viewer"))
+		return git_config_string(&man_viewer, var, value);
 	return git_default_config(var, value);
 }
 
@@ -345,11 +350,84 @@ static void setup_man_path(void)
 	strbuf_release(&new_path);
 }
 
+static int check_emacsclient_version()
+{
+	struct strbuf buffer = STRBUF_INIT;
+	ssize_t size;
+	struct child_process ec_process;
+	const char *argv_ec[] = { "emacsclient", "--version", NULL };
+	int version;
+
+	/* emacsclient prints its version number on stderr */
+	memset(&ec_process, 0, sizeof(ec_process));
+	ec_process.argv = argv_ec;
+	ec_process.err = -1;
+	ec_process.stdout_to_stderr = 1;
+	if (start_command(&ec_process)) {
+		fprintf(stderr, "Failed to start emacsclient.\n");
+		return -1;
+	}
+	size = strbuf_read(&buffer, ec_process.err, 20);
+	close(ec_process.err);
+
+	/* Don't bother checking return value, because "emacsclient --version"
+	 * seems to always exits with code 1. */
+	finish_command(&ec_process);
+
+	if (prefixcmp(buffer.buf, "emacsclient")) {
+		fprintf(stderr, "Failed to parse emacsclient version.\n");
+		strbuf_release(&buffer);
+		return -1;
+	}
+
+	strbuf_remove(&buffer, 0, strlen("emacsclient"));
+	version = atoi(buffer.buf);
+
+	if (version < 22) {
+		fprintf(stderr,
+			"emacsclient version '%d' too old (< 22).\n",
+			version);
+		strbuf_release(&buffer);
+		return -1;
+	}
+
+	strbuf_release(&buffer);
+	return 0;
+}
+
+static void exec_woman_emacs(const char *page)
+{
+	if (!check_emacsclient_version()) {
+		/* This works only with emacsclient version >= 22. */
+		struct strbuf man_page = STRBUF_INIT;
+		strbuf_addf(&man_page, "(woman \"%s\")", page);
+		execlp("emacsclient", "emacsclient", "-e", man_page.buf, NULL);
+	} else
+		execlp("man", "man", page, NULL);
+}
+
+static void exec_man_konqueror(const char *page)
+{
+	const char *display = getenv("DISPLAY");
+	if (display && *display) {
+		struct strbuf man_page = STRBUF_INIT;
+		strbuf_addf(&man_page, "man:%s(1)", page);
+		execlp("kfmclient", "kfmclient", "newTab", man_page.buf, NULL);
+	} else
+		execlp("man", "man", page, NULL);
+}
+
 static void show_man_page(const char *git_cmd)
 {
 	const char *page = cmd_to_page(git_cmd);
 	setup_man_path();
-	execlp("man", "man", page, NULL);
+	if (!man_viewer || !strcmp(man_viewer, "man"))
+		execlp("man", "man", page, NULL);
+	if (!strcmp(man_viewer, "woman"))
+		exec_woman_emacs(page);
+	if (!strcmp(man_viewer, "konqueror"))
+		exec_man_konqueror(page);
+	die("'%s': unsupported man viewer.", man_viewer);
 }
 
 static void show_info_page(const char *git_cmd)

-- 
1.5.4.3.328.gcaed.dirty