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rc filetype diff: extract diff parsing from diff-jump
Most diff consumers we've written only care about the "final" state after parsing through a diff. Let's extract the diff parsing part, for reuse in several new commands. In future we should try to use this (or better, a diff-parsing library) for patch-range.pl. We'd add a callback argument that is invoked once perl hunk (or line). Unfortunately I haven't found that library for Perl yet.
This commit is contained in:
Johannes Altmanninger
Maxime Coste
parent
ce7ceb1cf0
commit
36efbf4cbf
127
rc/filetype/diff-parse.pl
Executable file
127
rc/filetype/diff-parse.pl
Executable file
@ -0,0 +1,127 @@
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#!/usr/bin/env perl
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use warnings;
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sub quote {
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my $token = shift;
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$token =~ s/'/''/g;
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return "'$token'";
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}
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sub fail {
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my $reason = shift;
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print "set-register e fail " . quote("diff-parse.pl: $reason");
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exit;
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}
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my $begin;
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my $end;
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while (defined $ARGV[0]) {
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if ($ARGV[0] eq "--") {
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shift;
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last;
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}
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if ($ARGV[0] =~ m{^(BEGIN|END)$}) {
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if (not defined $ARGV[1]) {
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fail "missing argument to $ARGV[0]";
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}
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if ($ARGV[0] eq "BEGIN") {
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$begin = $ARGV[1];
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} else {
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$end = $ARGV[1];
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}
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shift, shift;
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next;
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}
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fail "unknown argument: $ARGV[0]";
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}
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# Inputs
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our $directory = $ENV{PWD};
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our $strip;
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our $version = "+";
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eval $begin if defined $begin;
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# Outputs
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our $file;
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our $file_line;
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our $diff_line_text;
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my $other_version;
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if ($version eq "+") {
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$other_version = "-";
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} else {
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$other_version = "+";
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}
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my $is_recursive_diff = 0;
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my $state = "header";
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my $fallback_file;
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my $other_file;
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my $other_file_line;
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sub strip {
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my $is_recursive_diff = shift;
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my $f = shift;
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my $effective_strip;
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if (defined $strip) {
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$effective_strip = $strip;
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} else {
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# A "diff -r" or "git diff" adds "diff" lines to
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# the output. If no such line is present, we have
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# a plain diff between files (not directories), so
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# there should be no need to strip the directory.
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$effective_strip = $is_recursive_diff ? 1 : 0;
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}
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if ($f !~ m{^/}) {
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$f =~ s,^([^/]+/+){$effective_strip},, or fail "directory prefix underflow";
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$f = "$directory/$f";
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}
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return $f;
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}
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while (<STDIN>) {
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s/^(> )*//g;
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$diff_line_text = $_;
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if (m{^diff\b}) {
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$state = "header";
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$is_recursive_diff = 1;
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if (m{^diff -\S* (\S+) (\S+)$}) {
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$fallback_file = strip $is_recursive_diff, ($version eq "+" ? $2 : $1);
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}
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next;
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}
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if ($state eq "header") {
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if (m{^[$version]{3} ([^\t\n]+)}) {
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$file = strip $is_recursive_diff, $1;
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next;
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}
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if (m{^[$other_version]{3} ([^\t\n]+)}) {
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$other_file = strip $is_recursive_diff, $1;
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next;
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}
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}
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if (m{^@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@}) {
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$state = "contents";
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$file_line = ($version eq "+" ? $2 : $1) - 1;
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$other_file_line = ($version eq "+" ? $1 : $2) - 1;
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} else {
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my $iscontext = m{^[ ]};
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if (m{^[ $version]}) {
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$file_line++ if defined $file_line;
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}
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if (m{^[ $other_version]}) {
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$other_file_line++ if defined $other_file_line;
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}
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}
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}
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if (not defined $file) {
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$file = ($fallback_file or $other_file);
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}
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if (not defined $file) {
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fail "missing diff header";
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}
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eval $end if defined $end;
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@ -29,7 +29,7 @@ define-command diff-jump -params .. -docstring %{
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- jump to the old file instead of the new file
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-<num> strip <num> leading directory components, like -p<num> in patch(1). Defaults to 1 if there is a 'diff' line (as printed by 'diff -r'), or 0 otherwise.
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} %{
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evaluate-commands -draft -save-regs ac| %{
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evaluate-commands -draft -save-regs c| %{
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# Save the column because we will move the cursor.
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set-register c %val{cursor_column}
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# If there is a "diff" line, we don't need to look further back.
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@ -41,25 +41,8 @@ define-command diff-jump -params .. -docstring %{
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# or content.
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execute-keys Gk
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}
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set-register a %arg{@}
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set-register | %{
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[ -n "$kak_reg_a" ] && eval set -- "$kak_quoted_reg_a"
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cmd=$(column=$kak_reg_c perl -we '
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sub quote {
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$SQ = "'\''";
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$token = shift;
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$token =~ s/$SQ/$SQ$SQ/g;
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return "$SQ$token$SQ";
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}
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sub fail {
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$reason = shift;
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print "fail " . quote("diff-jump: $reason");
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exit;
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}
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$version = "+", $other_version = "-";
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$strip = undef;
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$directory = $ENV{PWD};
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$seen_ddash = 0;
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diff-parse BEGIN %{
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my $seen_ddash = 0;
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foreach (@ARGV) {
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if ($seen_ddash or !m{^-}) {
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$directory = $_;
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@ -73,88 +56,55 @@ define-command diff-jump -params .. -docstring %{
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fail "unknown option: $_";
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}
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}
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$have_diff_line = 0;
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$state = "header";
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while (<STDIN>) {
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s/^(> )*//g;
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$last_line = $_;
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if (m{^diff\b}) {
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$state = "header";
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$have_diff_line = 1;
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if (m{^diff -\S* (\S+) (\S+)$}) {
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$fallback_file = $version eq "+" ? $2 : $1;
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}
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next;
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}
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if ($state eq "header") {
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if (m{^[$version]{3} ([^\t\n]+)}) {
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$file = $1;
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next;
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}
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if (m{^[$other_version]{3} ([^\t\n]+)}) {
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$fallback_file = $1;
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next;
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}
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}
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if (m{^@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@}) {
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$state = "contents";
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$line = ($version eq "+" ? $2 : $1) - 1;
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} elsif (m{^[ $version]}) {
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$line++ if defined $line;
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}
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}
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if (not defined $file) {
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$file = $fallback_file;
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}
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if (not defined $file) {
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fail "missing diff header";
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}
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if (not defined $strip) {
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# A "diff -r" or "git diff" adds "diff" lines to
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# the output. If no such line is present, we have
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# a plain diff between files (not directories), so
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# there should be no need to strip the directory.
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$strip = $have_diff_line ? 1 : 0;
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}
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if ($file !~ m{^/}) {
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$file =~ s,^([^/]+/+){$strip},, or fail "directory prefix underflow";
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$file = "$directory/$file";
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}
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if (defined $line) {
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$column = $ENV{column} - 1; # Account for [ +-] diff prefix.
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} END %exp{
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my $file_column;
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if (not defined $file_line) {
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$file_line = "";
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$file_column = "";
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} else {
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my $diff_column = %reg{c};
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$file_column = $diff_column - 1; # Account for [ +-] diff prefix.
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# If the cursor was on a hunk header, go to the section header if possible.
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if ($last_line =~ m{^(@@ -\d+(?:,\d+)? \+\d+(?:,\d+) @@ )([^\n]*)}) {
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$hunk_header_prefix = $1;
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$hunk_header_from_userdiff = $2;
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if ($diff_line_text =~ m{^(@@ -\d+(?:,\d+)? \+\d+(?:,\d+) @@ )([^\n]*)}) {
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my $hunk_header_prefix = $1;
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my $hunk_header_from_userdiff = $2;
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open FILE, "<", $file or fail "failed to open file: $!: $file";
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@lines = <FILE>;
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for (my $i = $line - 1; $i >= 0 && $i < scalar @lines; $i--) {
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my @lines = <FILE>;
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for (my $i = $file_line - 1; $i >= 0 and $i < scalar @lines; $i--) {
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if ($lines[$i] !~ m{\Q$hunk_header_from_userdiff}) {
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next;
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}
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$line = $i + 1;
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$file_line = $i + 1;
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# Re-add 1 because the @@ line does not have a [ +-] diff prefix.
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$column = $column + 1 - length $hunk_header_prefix;
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$file_column = $diff_column + 1 - length $hunk_header_prefix;
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last;
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}
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}
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}
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printf "edit -existing -- %s $line $column", quote($file);
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' -- "$@")
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echo "set-register c $cmd" >"$kak_command_fifo"
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}
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execute-keys <a-|><ret>
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printf "set-register c %%s $file_line $file_column\n", quote($file);
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} -- %arg{@}
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evaluate-commands -client %val{client} %{
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evaluate-commands -try-client %opt{jumpclient} %{
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%reg{c}
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edit -existing -- %reg{c}
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}
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}
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}
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}
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complete-command diff-jump file
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define-command -hidden diff-parse -params 2.. %{
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evaluate-commands -save-regs ae %{
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set-register a %arg{@}
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set-register e nop
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set-register | %{
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eval set -- "$kak_quoted_reg_a"
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perl "${kak_runtime}/rc/filetype/diff-parse.pl" "$@" >"$kak_command_fifo"
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}
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execute-keys <a-|><ret>
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%reg{e}
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}
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}
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§
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define-command \
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