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less: optionally query terminal size via "ESC [ 6 n". Closes bug 2659.
+7 bytes is not selected, +100 if selected. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
be391e7596
commit
4e552a70ec
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@ -132,8 +132,8 @@
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//config: help
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//config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
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//config: this option makes vi perform a last-ditch effort to find it:
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//config: vi positions cursor to 999,999 and asks terminal to report real
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//config: cursor position using "ESC [ 6 n" escape sequence, then reads stdin.
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//config: position cursor to 999,999 and ask terminal to report real
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//config: cursor position using "ESC [ 6 n" escape sequence, then read stdin.
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//config:
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//config: This is not clean but helps a lot on serial lines and such.
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//config:
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@ -214,7 +214,10 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
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}
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n++;
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/* Try to decipher "ESC [ NNN ; NNN R" sequence */
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if ((ENABLE_FEATURE_EDITING_ASK_TERMINAL || ENABLE_FEATURE_VI_ASK_TERMINAL)
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if ((ENABLE_FEATURE_EDITING_ASK_TERMINAL
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|| ENABLE_FEATURE_VI_ASK_TERMINAL
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|| ENABLE_FEATURE_LESS_ASK_TERMINAL
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)
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&& n >= 5
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&& buffer[0] == '['
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&& buffer[n-1] == 'R'
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@ -360,72 +360,6 @@ config FEATURE_LAST_FANCY
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logged into the system (mimics sysvinit last). +900 bytes.
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endchoice
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config LESS
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bool "less"
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default y
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help
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'less' is a pager, meaning that it displays text files. It possesses
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a wide array of features, and is an improvement over 'more'.
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config FEATURE_LESS_MAXLINES
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int "Max number of input lines less will try to eat"
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default 9999999
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depends on LESS
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config FEATURE_LESS_BRACKETS
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bool "Enable bracket searching"
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default y
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depends on LESS
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help
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This option adds the capability to search for matching left and right
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brackets, facilitating programming.
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config FEATURE_LESS_FLAGS
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bool "Enable extra flags"
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default y
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depends on LESS
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help
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The extra flags provided do the following:
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The -M flag enables a more sophisticated status line.
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The -m flag enables a simpler status line with a percentage.
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config FEATURE_LESS_MARKS
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bool "Enable marks"
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default y
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depends on LESS
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help
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Marks enable positions in a file to be stored for easy reference.
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config FEATURE_LESS_REGEXP
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bool "Enable regular expressions"
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default y
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depends on LESS
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help
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Enable regular expressions, allowing complex file searches.
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config FEATURE_LESS_WINCH
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bool "Enable automatic resizing on window size changes"
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default y
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depends on LESS
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help
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Makes less track window size changes.
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config FEATURE_LESS_DASHCMD
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bool "Enable flag changes ('-' command)"
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default y
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depends on LESS
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help
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This enables the ability to change command-line flags within
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less itself ('-' keyboard command).
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config FEATURE_LESS_LINENUMS
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bool "Enable dynamic switching of line numbers"
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default y
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depends on FEATURE_LESS_DASHCMD
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help
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Enables "-N" command.
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config HDPARM
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bool "hdparm"
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default y
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132
miscutils/less.c
132
miscutils/less.c
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@ -21,6 +21,85 @@
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* redirected input has been read from stdin
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*/
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//config:config LESS
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//config: bool "less"
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//config: default y
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//config: help
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//config: 'less' is a pager, meaning that it displays text files. It possesses
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//config: a wide array of features, and is an improvement over 'more'.
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//config:
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//config:config FEATURE_LESS_MAXLINES
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//config: int "Max number of input lines less will try to eat"
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//config: default 9999999
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//config: depends on LESS
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//config:
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//config:config FEATURE_LESS_BRACKETS
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//config: bool "Enable bracket searching"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: This option adds the capability to search for matching left and right
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//config: brackets, facilitating programming.
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//config:
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//config:config FEATURE_LESS_FLAGS
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//config: bool "Enable extra flags"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: The extra flags provided do the following:
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//config:
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//config: The -M flag enables a more sophisticated status line.
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//config: The -m flag enables a simpler status line with a percentage.
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//config:
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//config:config FEATURE_LESS_MARKS
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//config: bool "Enable marks"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: Marks enable positions in a file to be stored for easy reference.
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//config:
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//config:config FEATURE_LESS_REGEXP
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//config: bool "Enable regular expressions"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: Enable regular expressions, allowing complex file searches.
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//config:
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//config:config FEATURE_LESS_WINCH
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//config: bool "Enable automatic resizing on window size changes"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: Makes less track window size changes.
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//config:
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//config:config FEATURE_LESS_ASK_TERMINAL
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//config: bool "Use 'tell me cursor position' ESC sequence to measure window"
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//config: default y
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//config: depends on FEATURE_LESS_WINCH
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//config: help
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//config: Makes less track window size changes.
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//config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
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//config: this option makes less perform a last-ditch effort to find it:
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//config: position cursor to 999,999 and ask terminal to report real
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//config: cursor position using "ESC [ 6 n" escape sequence, then read stdin.
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//config:
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//config: This is not clean but helps a lot on serial lines and such.
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//config:
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//config:config FEATURE_LESS_DASHCMD
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//config: bool "Enable flag changes ('-' command)"
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//config: default y
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//config: depends on LESS
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//config: help
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//config: This enables the ability to change command-line flags within
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//config: less itself ('-' keyboard command).
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//config:
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//config:config FEATURE_LESS_LINENUMS
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//config: bool "Enable dynamic switching of line numbers"
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//config: default y
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//config: depends on FEATURE_LESS_DASHCMD
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//config: help
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//config: Enables "-N" command.
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//usage:#define less_trivial_usage
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//usage: "[-EMNmh~I?] [FILE]..."
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//usage:#define less_full_usage "\n\n"
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@ -107,6 +186,9 @@ struct globals {
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int num_matches;
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regex_t pattern;
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smallint pattern_valid;
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#endif
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#if ENABLE_FEATURE_LESS_ASK_TERMINAL
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smallint winsize_err;
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#endif
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smallint terminated;
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struct termios term_orig, term_less;
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@ -815,12 +897,17 @@ static void reinitialize(void)
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cur_fline = 0;
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max_lineno = 0;
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open_file_and_read_lines();
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#if ENABLE_FEATURE_LESS_ASK_TERMINAL
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if (G.winsize_err)
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printf("\033[999;999H" "\033[6n");
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#endif
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buffer_fill_and_print();
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}
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static int getch_nowait(void)
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static int64_t getch_nowait(void)
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{
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int rd;
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int64_t key64;
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struct pollfd pfd[2];
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pfd[0].fd = STDIN_FILENO;
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@ -868,8 +955,8 @@ static int getch_nowait(void)
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/* We have kbd_fd in O_NONBLOCK mode, read inside read_key()
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* would not block even if there is no input available */
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rd = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
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if (rd == -1) {
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key64 = read_key(kbd_fd, kbd_input, /*timeout off:*/ -2);
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if ((int)key64 == -1) {
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if (errno == EAGAIN) {
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/* No keyboard input available. Since poll() did return,
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* we should have input on stdin */
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@ -881,25 +968,29 @@ static int getch_nowait(void)
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less_exit(0);
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}
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set_tty_cooked();
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return rd;
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return key64;
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}
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/* Grab a character from input without requiring the return key.
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* May return KEYCODE_xxx values.
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* Note that this function works best with raw input. */
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static int less_getch(int pos)
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static int64_t less_getch(int pos)
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{
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int i;
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int64_t key64;
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int key;
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again:
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less_gets_pos = pos;
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i = getch_nowait();
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key = key64 = getch_nowait();
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less_gets_pos = -1;
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/* Discard Ctrl-something chars */
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if (i >= 0 && i < ' ' && i != 0x0d && i != 8)
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/* Discard Ctrl-something chars.
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* (checking only lower 32 bits is a size optimization:
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* upper 32 bits are used only by KEYCODE_CURSOR_POS)
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*/
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if (key >= 0 && key < ' ' && key != 0x0d && key != 8)
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goto again;
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return i;
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return key;
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}
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static char* less_gets(int sz)
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@ -1514,8 +1605,6 @@ static void sigwinch_handler(int sig UNUSED_PARAM)
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int less_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int less_main(int argc, char **argv)
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{
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int keypress;
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INIT_G();
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/* TODO: -x: do not interpret backspace, -xx: tab also */
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@ -1558,7 +1647,7 @@ int less_main(int argc, char **argv)
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term_less.c_cc[VMIN] = 1;
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term_less.c_cc[VTIME] = 0;
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get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
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IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
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/* 20: two tabstops + 4 */
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if (width < 20 || max_displayed_line < 3)
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return bb_cat(argv);
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@ -1573,11 +1662,14 @@ int less_main(int argc, char **argv)
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buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
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reinitialize();
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while (1) {
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int64_t keypress;
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#if ENABLE_FEATURE_LESS_WINCH
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while (WINCH_COUNTER) {
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again:
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winch_counter--;
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get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
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IF_FEATURE_LESS_ASK_TERMINAL(G.winsize_err =) get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
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IF_FEATURE_LESS_ASK_TERMINAL(got_size:)
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/* 20: two tabstops + 4 */
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if (width < 20)
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width = 20;
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@ -1597,8 +1689,18 @@ int less_main(int argc, char **argv)
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/* This took some time. Loop back and check,
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* were there another SIGWINCH? */
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}
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#endif
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keypress = less_getch(-1); /* -1: do not position cursor */
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# if ENABLE_FEATURE_LESS_ASK_TERMINAL
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if ((int32_t)keypress == KEYCODE_CURSOR_POS) {
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uint32_t rc = (keypress >> 32);
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width = (rc & 0x7fff);
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max_displayed_line = ((rc >> 16) & 0x7fff);
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goto got_size;
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}
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# endif
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#else
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keypress = less_getch(-1); /* -1: do not position cursor */
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#endif
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keypress_process(keypress);
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}
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}
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