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Provide default pagers

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Borrowed from systemd.
This commit is contained in:
Eelco Dolstra 2014-12-10 18:16:05 +01:00
parent 851b47bd7d
commit c56bfbe863
1 changed files with 8 additions and 3 deletions
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9
src/libmain/shared.cc
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@ -291,8 +291,9 @@ int handleExceptions(const string & programName, std::function<void()> fun)
RunPager::RunPager()
{
string pager = getEnv("PAGER");
if (!isatty(STDOUT_FILENO) || pager.empty()) return;
if (!isatty(STDOUT_FILENO)) return;
string pager = getEnv("PAGER", "default");
if (pager == "" || pager == "cat") return;
/* Ignore SIGINT. The pager will handle it (and we'll get
SIGPIPE). */
@ -312,7 +313,11 @@ RunPager::RunPager()
throw SysError("dupping stdin");
if (!getenv("LESS"))
setenv("LESS", "FRSXMK", 1);
if (pager != "default")
execl("/bin/sh", "sh", "-c", pager.c_str(), NULL);
execlp("pager", "pager", NULL);
execlp("less", "less", NULL);
execlp("more", "more", NULL);
throw SysError(format("executing ‘%1%’") % pager);
});