noxz-sites A collection of a builder and various scripts creating the noxz.tech sites
	git clone https://noxz.tech/git/noxz-sites.git
	Log | Files | README | LICENSE

commit: 3128135aa4bc9982f98947f80888c82daaa801cb
parent: 444a049aa37aa11cbe7cda8f31dec1d1a14ed4b4
author: Chris Noxz <chris@noxz.tech>
date:   Wed, 9 Oct 2019 14:33:40 +0200

Create article about vi-indicator for loksh

diff --git a/Makefile b/Makefile
@@ -19,7 +19,7 @@ all: clean builder
 	@
 	@echo creating tar archive 'web.tar'
 	@find ./ -type f -regex \
-	".*\.\(jpg\|png\|svg\|html\|css\|asc\|pub\|rss\|xml\|swps\|txt\)" \
+	".*\.\(jpg\|png\|svg\|html\|css\|asc\|pub\|rss\|xml\|swps\|txt\|patch\)" \
 	-exec tar -rf web.tar {} \;
 
 builder: config.h builder.c
diff --git a/noxz.tech/articles.nobuild/vi_indicator_for_loksh/.buildignore b/noxz.tech/articles.nobuild/vi_indicator_for_loksh/.buildignore
diff --git a/noxz.tech/articles.nobuild/vi_indicator_for_loksh/.createdate b/noxz.tech/articles.nobuild/vi_indicator_for_loksh/.createdate
@@ -0,0 +1 @@
+2019-10-09 14:29:32
diff --git a/noxz.tech/articles.nobuild/vi_indicator_for_loksh/index.md b/noxz.tech/articles.nobuild/vi_indicator_for_loksh/index.md
@@ -0,0 +1,19 @@
+When I switched from bash to (lo)ksh I did so because of bash being too bloated
+and prone to become slow under certain circumstances. However, there was a
+feature that I missed from bash \\-- the ability to indicate vi modes (normal,
+input & replace).
+
+I couldn't find anyone already having implemented this feature in ksh, so I
+thought that I could do it myself. I made the implementation quite simple and
+straight forward. When using vi-mode and at the same time having the string
+*'[xxx]'* somewhere in the *PS1* environment variable, the selected mode will
+be indicated between the first *'['* and *']'*. What's between the brackets
+will act as placeholder, which requires the indicators too be of the same size.
+
+{: class="center"}
+![](usage.png)
+
+I've my own fork of (lo)ksh in my repositories together with the
+[commit](https://noxz.tech/git/loksh-noxz/commit/5ce539cb503ec38cd7f198c00a27744d12da75b4.html).
+Feel free to use it. I also have a patch available
+[here](loksh-viprompt-20190502-774e6d2.patch).
diff --git a/noxz.tech/articles.nobuild/vi_indicator_for_loksh/loksh-viprompt-20190502-774e6d2.patch b/noxz.tech/articles.nobuild/vi_indicator_for_loksh/loksh-viprompt-20190502-774e6d2.patch
@@ -0,0 +1,188 @@
+Author: Chris Noxz <chris@noxz.tech>
+
+This patch adds the feature to visually indicate the current vi mode in the
+prompt. It's required to add a placeholder in your PS1 such as '[xxx] '. The
+indicator will be inserted between the first '[' and the first ']'. All status
+indicators needs to be of the same visible size, such as 'cmd','ins' and 'rep'.
+
+Happy hacking
+
+diff --git a/vi.c b/vi.c
+index 12202d5..bd96137 100644
+--- a/vi.c
++++ b/vi.c
+@@ -28,6 +28,10 @@ struct edstate {
+ 	int	cursor;		/* byte# in cbuf having the cursor */
+ };
+ 
++static const char vprompt_normal[] = "\\[\x1b[1;31m\\]cmd\\[\x1b[0m\\]";
++static const char vprompt_insert[] = "\\[\x1b[1;32m\\]ins\\[\x1b[0m\\]";
++static const char vprompt_replace[] = "\\[\x1b[1;33m\\]rep\\[\x1b[0m\\]";
++static void set_insert(int);
+ 
+ static int	vi_hook(int);
+ static void	vi_reset(char *, size_t);
+@@ -754,21 +758,21 @@ vi_cmd(int argcnt, const char *cmd)
+ 			if (es->linelen != 0)
+ 				while (isu8cont(es->cbuf[++es->cursor]))
+ 					continue;
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'A':
+ 			modified = 1; hnum = hlast;
+ 			del_range(0, 0);
+ 			es->cursor = es->linelen;
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'S':
+ 			es->cursor = domove(1, "^", 1);
+ 			del_range(es->cursor, es->linelen);
+ 			modified = 1; hnum = hlast;
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'Y':
+@@ -811,7 +815,7 @@ vi_cmd(int argcnt, const char *cmd)
+ 			}
+ 			if (*cmd == 'c') {
+ 				modified = 1; hnum = hlast;
+-				insert = INSERT;
++				set_insert(INSERT);
+ 			}
+ 			break;
+ 
+@@ -841,7 +845,7 @@ vi_cmd(int argcnt, const char *cmd)
+ 		case 'C':
+ 			modified = 1; hnum = hlast;
+ 			del_range(es->cursor, es->linelen);
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'D':
+@@ -870,13 +874,13 @@ vi_cmd(int argcnt, const char *cmd)
+ 
+ 		case 'i':
+ 			modified = 1; hnum = hlast;
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'I':
+ 			modified = 1; hnum = hlast;
+ 			es->cursor = domove(1, "^", 1);
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'j':
+@@ -931,7 +935,7 @@ vi_cmd(int argcnt, const char *cmd)
+ 
+ 		case 'R':
+ 			modified = 1; hnum = hlast;
+-			insert = REPLACE;
++			set_insert(REPLACE);
+ 			break;
+ 
+ 		case 's':
+@@ -943,7 +947,7 @@ vi_cmd(int argcnt, const char *cmd)
+ 					if (argcnt-- == 0)
+ 						break;
+ 			del_range(es->cursor, cur);
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			break;
+ 
+ 		case 'v':
+@@ -1087,7 +1091,7 @@ vi_cmd(int argcnt, const char *cmd)
+ 					es->cursor--;
+ 				return -1;
+ 			}
+-			insert = INSERT;
++			set_insert(INSERT);
+ 			}
+ 			break;
+ 
+@@ -1297,7 +1301,7 @@ redo_insert(int count)
+ 	if (es->cursor > 0)
+ 		while (isu8cont(es->cbuf[--es->cursor]))
+ 			continue;
+-	insert = 0;
++	set_insert(0);
+ 	return 0;
+ }
+ 
+@@ -2031,7 +2035,7 @@ expand_word(int command)
+ 	if (rval == 0 && i > 0)
+ 		es->cursor += i;
+ 	modified = 1; hnum = hlast;
+-	insert = INSERT;
++	set_insert(INSERT);
+ 	lastac = 0;
+ 	refresh(0);
+ 	return rval;
+@@ -2135,7 +2139,7 @@ complete_word(int command, int count)
+ 	x_free_words(nwords, words);
+ 
+ 	modified = 1; hnum = hlast;
+-	insert = INSERT;
++	set_insert(INSERT);
+ 	lastac = 0;	 /* prevent this from being redone... */
+ 	refresh(0);
+ 
+@@ -2197,10 +2201,49 @@ x_vi_zotc(int c)
+ 	x_putc(c);
+ }
+ 
++static void
++set_insert(int nmode)
++{
++	int update = nmode != insert;
++	insert = nmode;
++
++	if (update)
++		ed_mov_opt(0, wbuf[1 - win]);
++}
++
+ static void
+ vi_pprompt(int full)
+ {
+-	pprompt(prompt + (full ? 0 : prompt_skip), prompt_trunc);
++	const char *prefix = (
++		insert == 0 ? vprompt_normal :
++		insert == REPLACE ? vprompt_replace :
++		vprompt_insert);
++	char *nprompt = calloc(strlen(prefix) + strlen(prompt) + 1, sizeof(char));
++	int start_index = 0,
++		stop_index = 0,
++		length = 0;
++	char *start, *stop;
++
++	if ((start = strchr(prompt, '[')) && (stop = strchr(prompt, ']'))) {
++		start_index = (int)(start - prompt);
++		stop_index = (int)(stop - prompt);
++		length = (int)(stop_index - start_index - 1);
++	}
++
++	if (
++		promptlen(vprompt_insert, NULL) == length
++		&& promptlen(vprompt_normal, NULL) == length
++		&& promptlen(vprompt_replace, NULL) == length
++	) {
++		strncpy(nprompt, prompt, start_index + 1);
++		strcat(nprompt, prefix);
++		strncat(nprompt, prompt + stop_index, strlen(prompt) - stop_index);
++	} else {
++		strcat(nprompt, prompt);
++	}
++
++	pprompt(nprompt + (full ? 0 : prompt_skip), prompt_trunc);
++	free(nprompt);
+ }
+ 
+ static void
diff --git a/noxz.tech/articles.nobuild/vi_indicator_for_loksh/usage.png b/noxz.tech/articles.nobuild/vi_indicator_for_loksh/usage.png