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Allow $NIX_PAGER to override $PAGER

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This commit is contained in:
Eelco Dolstra 2015-01-02 15:26:56 +01:00
parent 8b88d25cda
commit 8027083c3a
1 changed files with 5 additions and 4 deletions
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9
src/libmain/shared.cc
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@ -293,8 +293,9 @@ int handleExceptions(const string & programName, std::function<void()> fun)
RunPager::RunPager() RunPager::RunPager()
{ {
if (!isatty(STDOUT_FILENO)) return; if (!isatty(STDOUT_FILENO)) return;
string pager = getEnv("PAGER", "default"); char * pager = getenv("NIX_PAGER");
if (pager == "" || pager == "cat") return; if (!pager) pager = getenv("PAGER");
if (pager && ((string) pager == "" || (string) pager == "cat")) return;
/* Ignore SIGINT. The pager will handle it (and we'll get /* Ignore SIGINT. The pager will handle it (and we'll get
SIGPIPE). */ SIGPIPE). */
@ -314,8 +315,8 @@ RunPager::RunPager()
throw SysError("dupping stdin"); throw SysError("dupping stdin");
if (!getenv("LESS")) if (!getenv("LESS"))
setenv("LESS", "FRSXMK", 1); setenv("LESS", "FRSXMK", 1);
if (pager != "default") if (pager)
execl("/bin/sh", "sh", "-c", pager.c_str(), NULL); execl("/bin/sh", "sh", "-c", pager, NULL);
execlp("pager", "pager", NULL); execlp("pager", "pager", NULL);
execlp("less", "less", NULL); execlp("less", "less", NULL);
execlp("more", "more", NULL); execlp("more", "more", NULL);