Subject: Re: [PATCH v8 5/5] help: respect new common command grouping

From: Eric Sunshine <[email-masked]>
Date: Mon, 18 May 2015 20:43:56 -0400

On Mon, May 18, 2015 at 02:39:42PM -0700, Junio C Hamano wrote:
> Sébastien Guimmara  <[email-masked]> writes:
> > 'git help' shows common commands in alphabetical order:
> > [...]
> > without any indication of how commands relate to high-level
> > concepts or each other. Revise the output to explain their relationship
> > with the typical Git workflow:
> > [...]
> > The typical Git workflow includes:
> >
> > Helped-by: Eric Sunshine <[email-masked]>
> > Signed-off-by: Sébastien Guimmara <[email-masked]>
> 
> I cannot exactly pinpoint what bothers me, but "The typical Git
> workflow includes:" sounds a bit awkward.
> What does a workflow "include"? [...]
> 
> Other than that, this round looks ready for 'next'.

I came to the same conclusion. FWIW, the entire series is:

Reviewed-by: Eric Sunshine <[email-masked]>

> I am not absolutely sure if new dependency on "awk" will not present
> portability issues, though.  So far we only used it in scripts in
> the fringes and only a few tests.

The awk script restricts itself to POSIX, and I did test it on Linux,
Mac OS X, and FreeBSD, so it seems pretty portable. However, if it
worries you sufficiently, here's the equivalent Perl version:

--- >8 ---
From: Eric Sunshine <[email-masked]>
Subject: [PATCH 3/5] generate-cmdlist: parse common group commands

Parse the group block to create the array of group descriptions:

static char *common_cmd_groups[] = {
    N_("starting a working area"),
    N_("working on the current change"),
    N_("working with others"),
    N_("examining the history and state"),
    N_("growing, marking and tweaking your history"),
};

then map each element of common_cmds[] to a group via its index:

static struct cmdname_help common_cmds[] = {
    {"add", N_("Add file contents to the index"), 1},
    {"branch", N_("List, create, or delete branches"), 4},
    {"checkout", N_("Checkout a branch or paths to the ..."), 4},
    {"clone", N_("Clone a repository into a new directory"), 0},
    {"commit", N_("Record changes to the repository"), 4},
    ...
};

so that 'git help' can print those commands grouped by theme.

Only commands tagged with an attribute from the group block are emitted to
common_cmds[].

[commit message by Sébastien Guimmara <[email-masked]>]

Signed-off-by: Eric Sunshine <[email-masked]>
---
 Makefile              |  4 ++--
 generate-cmdlist.perl | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 generate-cmdlist.sh   | 23 -----------------------
 3 files changed, 52 insertions(+), 25 deletions(-)
 create mode 100755 generate-cmdlist.perl
 delete mode 100755 generate-cmdlist.sh

diff --git a/Makefile b/Makefile
index 5ed0acf..c133a96 100644
--- a/Makefile
+++ b/Makefile
@@ -1693,10 +1693,10 @@ $(BUILT_INS): git$X
 	ln -s $< $@ 2>/dev/null || \
 	cp $< $@
 
-common-cmds.h: ./generate-cmdlist.sh command-list.txt
+common-cmds.h: generate-cmdlist.perl command-list.txt
 
 common-cmds.h: $(wildcard Documentation/git-*.txt)
-	$(QUIET_GEN)./generate-cmdlist.sh > $@+ && mv $@+ $@
+	$(QUIET_GEN)$(PERL_PATH) generate-cmdlist.perl command-list.txt > $@+ && mv $@+ $@
 
 SCRIPT_DEFINES = $(SHELL_PATH_SQ):$(DIFF_SQ):$(GIT_VERSION):\
 	$(localedir_SQ):$(NO_CURL):$(USE_GETTEXT_SCHEME):$(SANE_TOOL_PATH_SQ):\
diff --git a/generate-cmdlist.perl b/generate-cmdlist.perl
new file mode 100755
index 0000000..31516e3
--- /dev/null
+++ b/generate-cmdlist.perl
@@ -0,0 +1,50 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+print <<"EOT";
+/* Automatically generated by $0 */
+
+struct cmdname_help {
+	char name[16];
+	char help[80];
+	unsigned char group;
+};
+
+static char *common_cmd_groups[] = {
+EOT
+
+my $n = 0;
+my %grp;
+while (<>) {
+	last if /^### command list/;
+	next if (1../^### common groups/) || /^#/ || /^\s*$/;
+	chop;
+	my ($k, $v) = split ' ', $_, 2;
+	$grp{$k} = $n++;
+	print "\tN_(\"$v\"),\n";
+}
+
+print "};\n\nstatic struct cmdname_help common_cmds[] = {\n";
+
+while (<>) {
+	next if /^#/ || /^\s*$/;
+	my @tags = split;
+	my $cmd = shift @tags;
+	for my $t (@tags) {
+		if (exists $grp{$t}) {
+			my $s;
+			open my $f, '<', "Documentation/$cmd.txt" or die;
+			while (<$f>) {
+				($s) = /^$cmd - (.+)$/;
+				last if $s;
+			}
+			close $f;
+			$cmd =~ s/^git-//;
+			print "\t{\"$cmd\", N_(\"$s\"), $grp{$t}},\n";
+			last;
+		}
+	}
+}
+
+print "};\n";
diff --git a/generate-cmdlist.sh b/generate-cmdlist.sh
deleted file mode 100755
index 9a4c9b9..0000000
--- a/generate-cmdlist.sh
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/bin/sh
-
-echo "/* Automatically generated by $0 */
-struct cmdname_help {
-    char name[16];
-    char help[80];
-};
-
-static struct cmdname_help common_cmds[] = {"
-
-sed -n -e 's/^git-\([^ 	]*\)[ 	].* common.*/\1/p' command-list.txt |
-sort |
-while read cmd
-do
-     sed -n '
-     /^NAME/,/git-'"$cmd"'/H
-     ${
-	    x
-	    s/.*git-'"$cmd"' - \(.*\)/  {"'"$cmd"'", N_("\1")},/
-	    p
-     }' "Documentation/git-$cmd.txt"
-done
-echo "};"
-- 
2.4.1.260.ga2776d4

--- >8 ---