term_columns() checks for terminal width via ioctl(2). After
redirecting, stdin is no longer terminal to get terminal width.
Check terminal width and save it before redirecting stdin in
setup_pager() by calling term_columns().
Move term_columns() to pager.c and export it in cache.h.
Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx>
---
cache.h | 1 +
help.c | 22 -------------------
pager.c | 45 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 46 insertions(+), 22 deletions(-)
This replaces cb0850f (Save terminal width before setting up pager -
2012-02-04) from Nguyễn Thái Ngọc Duy and my previous patch to export
term_columns().
This is directly on top of v1.7.9 as requested.
I removed Signed-off-by from Nguyễn and Junio because the patch is
substantially changed.
diff --git a/cache.h b/cache.h
index 10afd71..2f30b3a 100644
--- a/cache.h
+++ b/cache.h
@@ -1175,6 +1175,7 @@ extern void setup_pager(void);
extern const char *pager_program;
extern int pager_in_use(void);
extern int pager_use_color;
+extern int term_columns(void);
extern const char *editor_program;
extern const char *askpass_program;
diff --git a/help.c b/help.c
index cbbe966..14eefc9 100644
--- a/help.c
+++ b/help.c
@@ -5,28 +5,6 @@
#include "help.h"
#include "common-cmds.h"
-/* most GUI terminals set COLUMNS (although some don't export it) */
-static int term_columns(void)
-{
- char *col_string = getenv("COLUMNS");
- int n_cols;
-
- if (col_string && (n_cols = atoi(col_string)) > 0)
- return n_cols;
-
-#ifdef TIOCGWINSZ
- {
- struct winsize ws;
- if (!ioctl(1, TIOCGWINSZ, &ws)) {
- if (ws.ws_col)
- return ws.ws_col;
- }
- }
-#endif
-
- return 80;
-}
-
void add_cmdname(struct cmdnames *cmds, const char *name, int len)
{
struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);
diff --git a/pager.c b/pager.c
index 975955b..b8049a4 100644
--- a/pager.c
+++ b/pager.c
@@ -76,6 +76,10 @@ void setup_pager(void)
if (!pager)
return;
+ /* prime the term_columns() cache before it is too
+ * late and stdout is replaced */
+ (void) term_columns();
+
setenv("GIT_PAGER_IN_USE", "true", 1);
/* spawn the pager */
@@ -110,3 +114,44 @@ int pager_in_use(void)
env = getenv("GIT_PAGER_IN_USE");
return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
}
+
+/*
+ * Return cached value (if set) or $COLUMNS (if set and positive) or
+ * ioctl(1, TIOCGWINSZ).ws_col (if positive) or 80.
+ *
+ * $COLUMNS even if set, is usually not exported, so
+ * the variable can be used to override autodection.
+ * This behaviour conforms to The Single UNIX Specification, Version 2
+ * (http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html#tag_002_003).
+ */
+int term_columns(void)
+{
+ static int term_columns_cache;
+
+ char *col_string;
+ int n_cols;
+
+ if (term_columns_cache)
+ return term_columns_cache;
+
+ col_string = getenv("COLUMNS");
+ if (col_string && (n_cols = atoi(col_string)) > 0) {
+ term_columns_cache = n_cols;
+ return term_columns_cache;
+ }
+
+#ifdef TIOCGWINSZ
+ {
+ struct winsize ws;
+ if (!ioctl(1, TIOCGWINSZ, &ws)) {
+ if (ws.ws_col) {
+ term_columns_cache = ws.ws_col;
+ return term_columns_cache;
+ }
+ }
+ }
+#endif
+
+ term_columns_cache = 80;
+ return term_columns_cache;
+}
--
1.7.9.3.g2429d.dirty
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