markmental/evil-qemacs
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Shell: prevent man command from paging

Browse source 
- apply infinite-height prior to winsize initialization.
- use `LESS_LINES` environment variable.
- use `PAGER=less -F` to make less quit at the end of the man page
This commit is contained in:
huwwa 2026-05-17 12:46:28 +02:00 • committed by Charlie Gordon
commit cbeb5d4acd
1 changed files with 21 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

34
modes/shell.c
View file

@ -230,6 +230,10 @@ static int run_process(ShellState *s,
}
fcntl(pty_fd, F_SETFL, O_NONBLOCK);
if (shell_flags & SF_INFINITE) {
rows += QE_TERM_YSIZE_INFINITE;
}
/* set dummy screen size */
ws.ws_col = cols;
ws.ws_row = rows;
@ -284,20 +288,21 @@ static int run_process(ShellState *s,
#ifdef CONFIG_DARWIN
setsid();
#endif
if (shell_flags & SF_INFINITE) {
rows += QE_TERM_YSIZE_INFINITE;
}
snprintf(lines_string, sizeof lines_string, "%d", rows);
snprintf(columns_string, sizeof columns_string, "%d", cols);
// XXX: should prevent less from paging:
// update the terminal size because
// ioctl TIOCGWINSZ or WIOCGETD take precedence
// over LINES and COLUMNS in linux
// MANWIDTH overrides COLUMNS and ioctl stuff?
// MAN_KEEP_FORMATING count be used
// "PAGER=less -E -z1000" does not seem to work
// "LESS=-E -z1000" does not work either
// To prevent less from paging is somewhat difficult to achieve
// portably:
// * we set the `LINES` and `COLUMNS` environment variables
// * we update the pseudo-terminal size because ioctl TIOCGWINSZ
// or WIOCGETD take precedence over LINES and COLUMNS in linux
// Other methods have been tried but are not portable solutions:
// * MANWIDTH overrides COLUMNS and ioctl stuff?
// * MAN_KEEP_FORMATING count be used
// * "PAGER=less -E -z1000" does not seem to work
// * "LESS=-E -z1000" does not work either
// We set `LESS_LINES` and `MANPAGER` in the man command
setenv("LINES", lines_string, 1);
setenv("COLUMNS", columns_string, 1);
setenv("TERM", "xterm-256color", 1);
@ -2867,8 +2872,11 @@ static void do_man(EditState *s, const char *arg)
s->qs->active_window = s;
}
/* Assume standard man command */
snprintf(cmd, sizeof(cmd), "man %s", arg);
// LESS_LINES Sets the number of lines on the screen and takes
// precedence over the system's idea of the screen size.
// -F makes less quit automatically when output fits the screen.
snprintf(cmd, sizeof(cmd), "LESS_LINES='%d' MANPAGER='less -F' man %s",
QE_TERM_YSIZE_INFINITE, arg);
snprintf(bufname, sizeof(bufname), "*Man %s*", arg);
if (try_show_buffer(&s, bufname))